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一、JAVA POI 实现EXCEL 工具类
我们目的是要建立一个EXCEL的工具类，它的功能：
1、可以生成动态表头，单级，多级都支持，尤其是树形表头（整体思路按照树形结构数据来遍历）；
2、数据可配置，支持动态填写数据（一个List结构的数据）；
3、读取Excel数据；
设计思路：需要一个含有树形结构的实体类Column，用于转换外部数据；而且该实体类要记录下它自己在EXCEL表中的坐标，以及跨行，跨列；接着用这个实体类来生成EXCEL表中的单元格cell。其中还需一个Tree工具类，它要处理Tree型结构数据；最终达到灵活导入导出Excel。
备注: tree根(最顶的节点root)的id必须为零。
二、工具，知识
工具：Java8 + PIO3.9+ Maven +Idea
知识：PIO操作Excel、递归使用、Map List 的遍历、Java类的反射、File的读写
三、代码
补充：
<!--依赖的jar包-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.9</version>
</dependency>（1）Column的实体类
/**
* Created by wtj on 2018/5/2.
*/
import java.util.ArrayList;
import java.util.List;
public class Column {
//单元格内容
private String content;
//字段名称，用户导出表格时反射调用
private String fieldName;
//这个单元格的集合
private List<Column> listTpamscolumn = new ArrayList<Column>();
int totalRow;
int totalCol;
int row;//excel第几行
int col;//excel第几列
int rLen; //excel 跨多少行
int cLen;//excel跨多少列
private boolean HasChilren;//是否有子节点
private int tree_step;//树的级别 从0开始
private String id;
private String pid;
public Column(){};
public Column(String content, String fieldName){
this.content = content;
this.fieldName = fieldName;
}
public Column(String fieldName, String content, int tree_step) {
this.tree_step = tree_step;
this.fieldName = fieldName;
this.content = content;
}
public int getTotalRow() {
return totalRow;
}
public void setTotalRow(int totalRow) {
this.totalRow = totalRow;
}
public int getTotalCol() {
return totalCol;
}
public void setTotalCol(int totalCol) {
this.totalCol = totalCol;
}
public String getPid() {
return pid;
}
public void setPid(String pid) {
this.pid = pid;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public boolean isHasChilren() {
return HasChilren;
}
public void setHasChilren(boolean hasChilren) {
HasChilren = hasChilren;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getFieldName() {
return fieldName;
}
public void setFieldName(String fieldName) {
this.fieldName = fieldName;
}
public List<Column> getListTpamscolumn() {
return listTpamscolumn;
}
public void setListTpamscolumn(List<Column> listTpamscolumn) {
this.listTpamscolumn = listTpamscolumn;
}
public int getTree_step() {
return tree_step;
}
public void setTree_step(int tree_step) {
this.tree_step = tree_step;
}
public int getRow() {
return row;
}
public void setRow(int row) {
this.row = row;
}
public int getCol() {
return col;
}
public void setCol(int col) {
this.col = col;
}
public int getrLen() {
return rLen;
}
public void setrLen(int rLen) {
this.rLen = rLen;
}
public int getcLen() {
return cLen;
}
public void setcLen(int cLen) {
this.cLen = cLen;
}
}（2）TreeTool类
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* 处理tree结构的数据 工具类
* Created by wtj on 2018/5/20
* 修改时间：2019/03/20
*/
public class TreeTool {
/**
* 传入的id 必须存在list集合里
* 获取某节点的深度
* @param list
* @param id 根节点
* @param step
* @return
*/
public static int getTreeStep(List<Column> list, String id, int step) {
if("".equals(id) || null == id) return step;
for (Column cc : list) {
if (id.equals(cc.getId())) {
int temp = step + 1;
return getTreeStep(list, cc.getPid(), temp);
}
}
return step;
}
/**
* 遍历所有数据 获取树最大的深度
* @param list
* @return
*/
public static int getMaxStep(List<Column> list){
List<Integer> nums=new ArrayList<Integer>();
for(Column cc:list){
nums.add( getTreeStep( list,cc.getId(),0));
}
return Collections.max(nums);
}
/**
* 获取最底部子节点的个数 所有叶子节点个数
* @param list
* @param did
* @return
*/
public static int getDownChilren(List<Column> list, String did){
int sum=0;
for(Column cc:list){
if(did.equals(cc.getPid())){
sum++;
//判断该节点 是否有子节点
if(hasChild(list,cc)) {
sum+= getDownChilren(list, cc.getId())-1;
}
}
}
return sum;
}
/**
* 获取父节点
* @param list 所有的list数据，一条一条
* @param did 当前节点id
* @return
*/
public static Column getFCol(List<Column> list, String did){
for(Column cc:list) {
if (did !=null && did.equals(cc.getId())) {
return cc;
}
if (did ==null && did == cc.getId()) {
return cc;
}
}
return new Column(){{setCol(0);setRow(0);}};
}
/**
* 获取兄弟节点个数 这个必须是有排序的
* @param list 所有的list数据，一条一条
* @param column 当前节点信息
* @return
*/
public static int getBrotherChilNum(List<Column> list, Column column ){
int sum=0;
for(Column cc:list){
if(column.getId().equals(cc.getId()))break;
if(!column.getPid().equals(cc.getPid()))continue;
int temp = getDownChilren(list, cc.getId());
if(temp == 0 || temp == 1)
sum++;
else
sum += temp;
}
return sum;
}
/**
* 根据某节点的第几层的父节点id
* @param list 所有的list数据，一条一条
* @param id 当前节点id
* @param step 第几层(深度 从零开始)
* @return
*/
public static String getStepFid(List<Column> list, String id, int step){
String f_id = null;
for (Column cc : list) {
if (id.equals(cc.getId())) {
int cstep = getTreeStep( list, cc.getId(), 0);
if(step == cstep){
return id;
}
int fstep = getTreeStep( list, cc.getPid(), 0);
if(step == fstep){
f_id = cc.getPid();break;
}else {
getStepFid( list, cc.getPid(), step);
}
}
}
return f_id;
}
/**
* 判断是否有子节点
* @param list 遍历的数据
* @param node 某个节点
* @return
*/
public static boolean hasChild(List<Column> list, Column node) {
return getChildList(list, node).size() > 0 ? true : false;
}
/**
* 得到子节点列表
* @param list 遍历的数据
* @param node 某个节点
* @return
*/
public static List<Column> getChildList(List<Column> list, Column node) {
List<Column> nodeList = new ArrayList<Column>();
Iterator<Column> it = list.iterator();
while (it.hasNext()) {
Column n = (Column) it.next();
if (n.getPid()!=null && n.getPid().equals( node.getId())) {
nodeList.add(n);
}
}
return nodeList;
}
/**
* 使用递归方法建树
* @param treeNodes
* @return
*/
public static List<Column> buildByRecursive(List<Column> treeNodes,String rootID) {
List<Column> trees = new ArrayList<>();
boolean flag = false;
boolean sflag = false;
for (Column treeNode : treeNodes) {
if ((rootID == null && rootID == treeNode.getId()) ) {
flag = true;
}
if( rootID != null && rootID.equals(treeNode.getId())){
flag = true;
}
if(flag) {
trees.add(findChildren(treeNode, treeNodes));
flag = false;
}
}
if(trees.size() <= 0) {
for (Column treeNode : treeNodes) {
if ((rootID == null && rootID == treeNode.getPid()) ) {
sflag = true;
}
if( rootID != null && rootID.equals(treeNode.getPid())){
sflag = true;
}
if(sflag){
trees.add(findChildren(treeNode,treeNodes));
sflag = false;
}
}
}
return trees;
}
/**
* 递归查找子节点
* @param treeNodes
* @return
*/
public static Column findChildren(Column treeNode, List<Column> treeNodes) {
for (Column it : treeNodes) {
if(treeNode.getId().equals(it.getPid())) {
if (treeNode.getListTpamscolumn() == null) {
treeNode.setListTpamscolumn(new ArrayList<Column>());
}
treeNode.getListTpamscolumn().add(findChildren(it,treeNodes));
}
}
return treeNode;
}
}
（3）ExcelTool类
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.*;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* excel处理工具
* 概念-> 表头数据:报表的表头
* 行内数据:表头以下的数据
* 功能:动态生成单级，多级Excel表头
* 备注：tree型结构数据的root节点的id必须为零（0）
* Created by wtj on 2018/3/2.
* 修改:
* 2019/03/18 修复生成跨列的bug
* 2019/03/20 修复集合存在root的时候，生成不了动态表头
* @param <T>
*/
public class ExcelTool<T> {
private HSSFWorkbook workbook;//excel 对象
private String title; //表格标题
private int colWidth = 20; //单元格宽度
private int rowHeight = 20;//单元格行高度
private HSSFCellStyle styleHead; //表头样式
private HSSFCellStyle styleBody; //主体样式
private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //日期格式化,默认yyyy-MM-dd HH:mm:ss
/**
* 无参数 初始化 对象
*/
public ExcelTool(){
this.title="sheet1";
this.workbook = new HSSFWorkbook();
init(0);
}
/**
* 有参数 初始化 对象
* @param title
* @param colWidth
* @param rowHeight
* @param dateFormat
*/
public ExcelTool(String title,int colWidth,int rowHeight,String dateFormat){
this.colWidth = colWidth;
this.rowHeight = rowHeight;
this.title = title;
this.workbook = new HSSFWorkbook();
sdf = new SimpleDateFormat(dateFormat);
init(0);
}
public ExcelTool(String title,int colWidth,int rowHeight){
this.colWidth = colWidth;
this.rowHeight = rowHeight;
this.title = title;
this.workbook = new HSSFWorkbook();
init(0);
}
public ExcelTool(String title,int colWidth,int rowHeight,int flag){
this.colWidth = colWidth;
this.rowHeight = rowHeight;
this.title = title;
this.workbook = new HSSFWorkbook();
init(flag);
}
public ExcelTool(String title){
this.title = title;
workbook = new HSSFWorkbook();
init(0);
}
/**ExcelTool 属性 get、set 方法 开始*/
public int getColWidth() {
return colWidth;
}
public void setColWidth(int colWidth) {
this.colWidth = colWidth;
}
public int getRowHeight() {
return rowHeight;
}
public void setRowHeight(int rowHeight) {
this.rowHeight = rowHeight;
}
public HSSFWorkbook getWorkbook() {
return workbook;
}
public void setWorkbook(HSSFWorkbook workbook) {
this.workbook = workbook;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public HSSFCellStyle getStyleHead() {
return styleHead;
}
public void setStyleHead(HSSFCellStyle styleHead) {
this.styleHead = styleHead;
}
public HSSFCellStyle getStyleBody() {
return styleBody;
}
public void setStyleBody(HSSFCellStyle styleBody) {
this.styleBody = styleBody;
}
/**ExcelTool 属性 get、set 方法 结束*/
//内部统一调用的样式初始化
private void init(int styleFlag){
styleHead = workbook.createCellStyle();
styleHead.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
styleHead.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
styleHead.setRightBorderColor(HSSFColor.BLACK.index);
styleHead.setBottomBorderColor(HSSFColor.BLACK.index);
switch(styleFlag){
case 1:
styleBody = workbook.createCellStyle();
styleBody.setAlignment(HSSFCellStyle.ALIGN_LEFT);// 左右居中ALIGN_CENTER
styleBody.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
styleBody.setRightBorderColor(HSSFColor.BLACK.index);
styleBody.setBottomBorderColor(HSSFColor.BLACK.index);
styleBody.setBorderRight((short) 1);// 边框的大小
styleBody.setBorderBottom((short) 1);// 边框的大小
break;
default:
styleBody = workbook.createCellStyle();
styleBody.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中ALIGN_CENTER
styleBody.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
styleBody.setRightBorderColor(HSSFColor.BLACK.index);
styleBody.setBottomBorderColor(HSSFColor.BLACK.index);
styleBody.setBorderRight((short) 1);// 边框的大小
styleBody.setBorderBottom((short) 1);// 边框的大小
break;
}
}
/**
* 导出表格 无返回
* @param listTpamscolumn 表头数据
* @param datas 行内数据
* @param FilePath 保存路径
* @param flag
* @param rowFlag
* @throws Exception
*/
public void exportExcel(List<Column> listTpamscolumn, List<T> datas, String FilePath, boolean flag, boolean rowFlag) throws Exception{
splitDataToSheets(datas, listTpamscolumn,flag,rowFlag);
save(workbook,FilePath);
}
/**
* 导出表格 有返回值
* @param listTpamscolumn 表头数据
* @param datas 行内数据
* @param flag 只输出表头数据
* @param rowFlag
* @return
* @throws Exception
*/
public InputStream exportExcel(List<Column> listTpamscolumn, List<T> datas, boolean flag, boolean rowFlag) throws Exception {
splitDataToSheets(datas, listTpamscolumn,flag,rowFlag);
return save(workbook);
}
/**
* 导出Excel,适用于web导出excel
* @param sheet excel
* @param data 行内数据
* @param listTpamscolumn 表头数据
* @param flag 只输出表头数据
* @param rowFlag 输出展示数据的结构(表头下面行的数据)
* @throws Exception
*/
private void writeSheet(HSSFSheet sheet, List<T> data, List<Column> listTpamscolumn, boolean flag, boolean rowFlag) throws Exception {
sheet.setDefaultColumnWidth(colWidth);
sheet.setDefaultRowHeightInPoints(rowHeight);
sheet = createHead(sheet, listTpamscolumn.get(0).getTotalRow(), listTpamscolumn.get(0).getTotalCol());
createHead(listTpamscolumn,sheet,0);
if(flag)//控制是否 bug修复201905061942：每次写入行数据时，总是漏第一个条数据 rowIndex 错误
writeSheetContent(listTpamscolumn,data,sheet, listTpamscolumn.get(0).getTotalRow()+1,rowFlag);
}
/**
* 拆分sheet，因为每个sheet不能超过6526，否则会报异常
* @param data 行内数据
* @param listTpamscolumn 表头数据
* @param flag 只输出表头数据
* @param rowFlag 输出展示数据的结构(表头下面行的数据)
* @throws Exception
*/
private void splitDataToSheets(List<T> data, List<Column> listTpamscolumn, boolean flag, boolean rowFlag)throws Exception{
int dataCount = data.size();
int maxColumn = 65535;
int pieces = dataCount/maxColumn;
for(int i = 1; i <= pieces;i++){
HSSFSheet sheet = workbook.createSheet(this.title+i);
List<T> subList = data.subList((i-1)*maxColumn, i*maxColumn);
writeSheet(sheet,subList, listTpamscolumn,flag,rowFlag);
}
HSSFSheet sheet = workbook.createSheet(this.title+(pieces+1));
writeSheet(sheet, data.subList(pieces*maxColumn, dataCount), listTpamscolumn,flag,rowFlag);
}
/**
* 把数据写入到单元格
* @param listTpamscolumn 表头数据
* @param datas 行内数据
* @param sheet 工作表（excel分页）
* @throws Exception
* void
*/
private void writeSheetContent(List<Column> listTpamscolumn, List<T> datas, HSSFSheet sheet, int rowIndex, boolean rowFlag) throws Exception{
HSSFRow row = null;
List<Column> listCol=new ArrayList<>();
rowFlag=false;
if(rowFlag){//暂时没有用 后面扩展用
for (int i = 0, index = rowIndex; i < datas.size(); i++, index++) {
row = sheet.createRow(index);//创建行
for (int j = 0; j < listTpamscolumn.size(); j++) {
createColl(row,j,listTpamscolumn.get(j).getFieldName() ,datas.get(i));
}
}
}
else {
getColumnList(listTpamscolumn, listCol);
for (int i = 0, index = rowIndex; i < datas.size(); i++, index++) {
row = sheet.createRow(index);//创建行
for (int j = 0; j < listCol.size(); j++) {
Column c = listCol.get(j);
createCol(row, c, datas.get(i));
}
}
}
}
/**
* 根据list 来创建单元格 暂时没有用
* @param row
* @param j
* @param finame
* @param t
*/
private void createColl(HSSFRow row, int j, String finame, T t) {
HSSFCell cell = row.createCell(j); //创建单元格
cell.setCellStyle(styleBody); //设置单元格样式
String text="";
if(t instanceof List){
List<Map> temp= (List<Map>)t;
if(j>=temp.size()) return;
text=String.valueOf( temp.get(j).get(finame)==null?"": temp.get(j).get(finame));
}
HSSFRichTextString richString = new HSSFRichTextString(text);
cell.setCellValue(richString);
}
/**
* 把column的columnList整理成一个list<column> 过滤表头的脏数据
* @param list 表头数据
* @param listCol 返回新的list
* @return
* List<column>
*/
private void getColumnList(List<Column> list, List<Column> listCol){
for(int i = 0; i < list.size(); i++){
if(list.get(i).getFieldName() != null){
listCol.add(list.get(i));
}
List<Column> listChilren = list.get(i).getListTpamscolumn();
if(listChilren.size() > 0){
getColumnList( listChilren, listCol);
}
}
}
/**
* 保存Excel到InputStream，此方法适合web导出excel
* @param workbook
* @return
*/
private InputStream save(HSSFWorkbook workbook) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
workbook.write(bos);
InputStream bis = new ByteArrayInputStream(bos.toByteArray());
return bis;
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
/**
* 保存excel到本机指定的路径
* @param workbook
* @param filePath
* @throws IOException
*/
private void save(HSSFWorkbook workbook, String filePath){
File file = new File(filePath);
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
FileOutputStream fOut = null;
try {
fOut = new FileOutputStream(file);
workbook.write(fOut);
fOut.flush();
} catch (Exception e) {
e.printStackTrace();
}
try {if(null!=fOut) fOut.close();} catch (Exception e1) { }
}
/**
* 创建行
* @param row Excel对应的行
* @param tpamscolumn 当前单元格属性
* @param v
* @param j
* @return
* @throws Exception
*/
public int createRowVal(HSSFRow row, Column tpamscolumn, T v, int j) throws Exception{
//遍历标题
if(tpamscolumn.getListTpamscolumn() != null && tpamscolumn.getListTpamscolumn().size() > 0){
for(int i = 0; i < tpamscolumn.getListTpamscolumn().size(); i++){
createRowVal(row, tpamscolumn.getListTpamscolumn().get(i),v,j);
}
}else{
createCol(row, tpamscolumn,v);
}
return j;
}
/**
* 创建单元格
* @param row Excel对应的行
* @param tpamscolumn 当前单元格对象
* @param v
* @throws Exception
*/
public void createCol(HSSFRow row, Column tpamscolumn, T v) throws Exception{
HSSFCell cell = row.createCell( tpamscolumn.getCol()); //创建单元格
cell.setCellStyle(styleBody); //设置单元格样式
final Object[] value = {null};
if(v instanceof Map){
Map m=(Map)v;
m.forEach((k, val) -> {
if(k.equals(tpamscolumn.getFieldName()) && !tpamscolumn.isHasChilren()){
value[0] =val;
}
});
}else {
Class<?> cls = v.getClass();// 拿到该类
Field[] fields=cls.getDeclaredFields();// 获取实体类的所有属性，返回Field数组
for(int i=0;i<fields.length;i++){
Field f = fields[i];
f.setAccessible(true); // 设置些属性是可以访问的
if(tpamscolumn.getFieldName().equals(f.getName()) && !tpamscolumn.isHasChilren() )// && !tpamscolumn.isHasChilren()
value[0] = f.get(v);
if(value[0] instanceof Date)
value[0] = parseDate((Date) value[0]);
}
}
if(value[0]!=null) {
HSSFRichTextString richString = new HSSFRichTextString(value[0].toString());
cell.setCellValue(richString);
}
}
/**
* 时间转换
* @param date
* @return
* String
*/
private String parseDate(Date date){
String dateStr = "";
try{
dateStr = sdf.format(date);
} catch (Exception e){
e.printStackTrace();
}
return dateStr;
}
/**
* 根据数据的行数和列数，在excel创建单元格cell
* @param sheetCo excel分页
* @param r excel 行数
* @param c excel 列数
* @return
*/
public HSSFSheet createHead(HSSFSheet sheetCo, int r, int c){
for(int i = 0; i <r; i++){
HSSFRow row = sheetCo.createRow(i);
for(int j = 0; j <c; j++){
HSSFCell cell=row.createCell(j);
}
}
return sheetCo;
}
/**
* 使用递归 在excel写入表头数据 支持单级，多级表头的创建
* @param listTpamscolumn 表头数据
* @param sheetCo 哪个分页
* @param rowIndex 当前Excel的第几行
*/
public void createHead(List<Column> listTpamscolumn, HSSFSheet sheetCo, int rowIndex){
HSSFRow row = sheetCo.getRow(rowIndex);
// if(row == null)row = sheetCo.createRow(rowIndex);
int len = listTpamscolumn.size();//当前行 有多少列
for(int i = 0; i <len; i++){//i是headers的索引，n是Excel的索引 多级表头
Column tpamscolumn = listTpamscolumn.get(i);
//创建这一行的第几列单元格
int r = tpamscolumn.getRow();
int rLen = tpamscolumn.getrLen();
int c = tpamscolumn.getCol();
int cLen = tpamscolumn.getcLen();
int endR = r+rLen;
int endC = c+cLen;
if(endC > c){
endC--;
}
HSSFCell cell=row.getCell(c);
// if( null == cell)cell = row.createCell(c);
cell.setCellStyle(styleHead); //设置表头样式
HSSFRichTextString text = new HSSFRichTextString(tpamscolumn.getContent());
cell.setCellValue(text);
// 合并单元格
CellRangeAddress cra = new CellRangeAddress(r,endR,c,endC);
sheetCo.addMergedRegion(cra);
if(tpamscolumn.isHasChilren()){
rowIndex=r+1;
createHead( tpamscolumn.getListTpamscolumn(), sheetCo,rowIndex);
}
}
}
/**
* 转换成column对象
* 支持List<T>的数据结构:map String ，只能是单级的数据
* @param list 需要转换的数据
* @return
*/
public List<Column> columnTransformer(List<T> list){
List<Column> lc=new ArrayList<>();
if(list.get(0)instanceof Map) {
final int[] i = {1};
for (Map<String, String> m :(List<Map<String, String>>)list ) {
m.forEach((k, val) -> {
Column tpamscolumn = new Column();
tpamscolumn.setId(String.valueOf(i[0]));
tpamscolumn.setPid("0");
tpamscolumn.setContent(k);
tpamscolumn.setFieldName(val);
lc.add(tpamscolumn);
i[0]++;
});
}
} else {
int i = 1;
for(String s:(List<String>)list) {
Column tpamscolumn = new Column();
tpamscolumn.setId(String.valueOf(i));
tpamscolumn.setPid("0");
tpamscolumn.setContent(s);
tpamscolumn.setFieldName(null);
lc.add(tpamscolumn);
i++;
}
}
setParm(lc,"0");//处理一下
List<Column> s = TreeTool.buildByRecursive(lc,"0");
setColNum(lc,s,s);
return s;
}
/**
* 转换成column对象 返回tree数据结构
* 支持：List<map>、某个具体对象（entity）数据的转换
* @param list 需要转换的数据
* @param id 当前节点id 字段的名称 主键
* @param pid 父节点id 字段的名称
* @param content 填写表头单元格内容的 字段名称
* @param fielName 填写行内数据对的 字段名称
* @param rootid rootid的值
* @return
* @throws Exception
*/
public List<Column> columnTransformer(List<T> list , String id, String pid, String content, String fielName,String rootid) throws Exception {
List<Column> lc=new ArrayList<>();
if(list.get(0) instanceof Map){
for(Map m:(List<Map>)list) {
Column tpamscolumn = new Column();
m.forEach((k, val) -> {//java8 以上的遍历方式
if (id.equals(k))
tpamscolumn.setId(String.valueOf(val));
if (pid.equals(k)) tpamscolumn.setPid((String) val);
if (content.equals(k)) tpamscolumn.setContent((String) val);
if (fielName.equals(k) && fielName != null) tpamscolumn.setFieldName((String) val);
});
lc.add(tpamscolumn);
}
}else {
for (T t : list) {//反射
Column tpamscolumn = new Column();
Class cls = t.getClass();
Field[] fs=cls.getDeclaredFields();
for (int i = 0; i < fs.length; i++) {
Field f = fs[i];
f.setAccessible(true); // 设置些属性是可以访问的
if (id.equals(f.getName()) && f.get(t) != null)
tpamscolumn.setId(f.get(t).toString());
if (pid.equals(f.getName()) && f.get(t) != null)
tpamscolumn.setPid(f.get(t).toString());
// if (pid.equals(f.getName()) && ( f.get(t) == null || "".equals(f.get(t)))) tpamscolumn.setPid("0");
if (content.equals(f.getName()) && f.get(t) != null)
tpamscolumn.setContent(f.get(t).toString());
if ( f.get(t) != null && fielName!=null && fielName.equals(f.getName()))
tpamscolumn.setFieldName(f.get(t).toString());
}
lc.add(tpamscolumn);
}
}
setParm(lc,rootid);//处理一下
List<Column> s = TreeTool.buildByRecursive(lc,rootid);
setColNum(lc,s,s);
return s;
}
/**
* 设置基础的参数
* @param list
*/
public static void setParm(List<Column> list,String rootid){
int row = 0;//excel第几行
int rLen = 0; //excel 跨多少行
int totalRow = TreeTool.getMaxStep(list);
int totalCol = TreeTool.getDownChilren(list,rootid);
for(int i=0;i<list.size();i++){
Column poit= list.get(i);
int tree_step = TreeTool.getTreeStep(list,poit.getPid(),0);//往上遍历tree
poit.setTree_step(tree_step);
poit.setRow(tree_step);//设置第几行
//判断是否有节点
boolean hasCh = TreeTool.hasChild( list,poit);
poit.setHasChilren(hasCh);
if(hasCh){
poit.setrLen(0);//设置跨多少行
}else{
if(tree_step < totalRow){
rLen = totalRow - tree_step;
}
poit.setrLen(rLen);
}
// boolean flag=false;//控制只有root 节点才有总的行数信息
// if(rootid == null && rootid == poit.getId() )flag = true;
// if(rootid != null && rootid.equals(poit.getId()))flag = true;
// if(flag){
//
// }
poit.setTotalRow(totalRow);
poit.setTotalCol(totalCol);
}
}
/**
* 设置基础的参数
* @param list 所有list数据，一条一条
* @param treeList 转成tree结构的list
*/
public static void setColNum(List<Column> list, List<Column> treeList,List<Column> flist){
// int col = pcIndex;//excel第几列
// int cLen ;//xcel跨多少列
List<Column> new_list = new ArrayList<>();//新的遍历list
for(int i = 0;i < treeList.size();i++){
Column poit= treeList.get(i);
// String temp_id = TreeTool.getStepFid(list,poit.getId() ,1);
int col = TreeTool.getFCol(list,poit.getPid()).getCol();
int brotherCol = TreeTool.getBrotherChilNum(list,poit);
poit.setCol(col+brotherCol);
int cLen = TreeTool.getDownChilren(list,poit.getId());
if(cLen<=1)cLen=0;
// else cLen--;
poit.setcLen(cLen);//设置跨多少列
if(poit.getListTpamscolumn().size()>0){
new_list.addAll(poit.getListTpamscolumn());
}
}
if(new_list.size() > 0){
setColNum( list,new_list,flist);
}
}
//========上部分是导出excel的使用（生成excel），下部分是解析excel，由于excel导入==================================================================================================================================
/**
* 根据HSSFCell类型设置数据
* @param cell 单元格
* @return
*/
public static String getCellFormatValue(Cell cell) {
String cellvalue = "";
if (cell != null) {
switch (cell.getCellType()) { // 判断当前Cell的Type
case HSSFCell.CELL_TYPE_NUMERIC: // 如果当前Cell的Type为NUMERIC
case HSSFCell.CELL_TYPE_FORMULA: {
// 判断当前的cell是否为Date
if (HSSFDateUtil.isCellDateFormatted(cell)) {
Date date = cell.getDateCellValue();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
cellvalue = sdf.format(date);
}
else { // 如果是纯数字
cellvalue = String.valueOf(cell.getNumericCellValue());
}
break;
}
case HSSFCell.CELL_TYPE_STRING: // 如果当前Cell的Type为STRIN
// 取得当前的Cell字符串
cellvalue = cell.getRichStringCellValue().getString();
break;
default: // 默认的Cell值
cellvalue = "";
}
} else {
cellvalue = "";
}
return cellvalue;
}
/**
* 描述：根据文件后缀，自适应上传文件的版本
* @param inStr,fileName
* @return
* @throws Exception
*/
public static Workbook getWorkbookType(InputStream inStr, String fileName) throws Exception{
Workbook wb = null;
String fileType = fileName.substring(fileName.lastIndexOf("."));
if(".xls".equals(fileType)){
wb = new HSSFWorkbook(inStr); //2003-
}else if(".xlsx".equals(fileType)){
wb = new XSSFWorkbook(inStr); //2007+
}else{
throw new Exception("导入格式错误");
}
return wb;
}
/**
* 获取单元格数据内容为字符串类型的数据
* @param cell Excel单元格
* @return String 单元格数据内容
*/
public static String getStringCellValue(Cell cell) {
String strCell = "";
if (cell == null) {
return "";
}
switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:
strCell = cell.getStringCellValue().trim();
break;
case Cell.CELL_TYPE_NUMERIC:
strCell = String.valueOf(cell.getNumericCellValue()).trim();
break;
case Cell.CELL_TYPE_BOOLEAN:
strCell = String.valueOf(cell.getBooleanCellValue()).trim();
break;
case Cell.CELL_TYPE_BLANK:
strCell = "";
break;
default:
strCell = "";
break;
}
if (strCell.equals("") || strCell == null) {
return "";
}
return strCell;
}
/**
* 判断指定的单元格是否是合并单元格
* @param sheet
* @param row 行下标
* @param column 列下标
* @return
*/
public boolean isMergedRegion(Sheet sheet, int row, int column) {
int sheetMergeCount = sheet.getNumMergedRegions();
for (int i = 0; i < sheetMergeCount; i++) {
CellRangeAddress range = sheet.getMergedRegion(i);
int firstColumn = range.getFirstColumn();
int lastColumn = range.getLastColumn();
int firstRow = range.getFirstRow();
int lastRow = range.getLastRow();
if (row >= firstRow && row <= lastRow) {
if (column >= firstColumn && column <= lastColumn) {
return true;
}
}
}
return false;
}
/**
* 获取合并单元格的值
* @param sheet
* @param row 行下标
* @param column 列下标
* @return
*/
public String getMergedRegionValue(Sheet sheet, int row, int column) {
int sheetMergeCount = sheet.getNumMergedRegions();
for (int i = 0; i < sheetMergeCount; i++) {
CellRangeAddress ca = sheet.getMergedRegion(i);
int firstColumn = ca.getFirstColumn();
int lastColumn = ca.getLastColumn();
int firstRow = ca.getFirstRow();
int lastRow = ca.getLastRow();
if (row >= firstRow && row <= lastRow) {
if (column >= firstColumn && column <= lastColumn) {
Row fRow = sheet.getRow(firstRow);
Cell fCell = fRow.getCell(firstColumn);
return getStringCellValue(fCell);
}
}
}
return "";
}
/**
* 获取excel的值 返回的 List<List<String>>的数据结构
* @param fileUrl 文件路径
* @param sheetNum 工作表（第几分页[1,2,3.....]）
* @return List<List<String>>
*/
public List<List<String>> getExcelValues(String fileUrl, int sheetNum) throws Exception{
List<List<String>> values = new ArrayList<List<String>>();
File file = new File(fileUrl);
InputStream is = new FileInputStream(file);
Workbook workbook = WorkbookFactory.create(is);
int sheetCount = sheetNum-1; //workbook.getNumberOfSheets();//sheet 数量,可以只读取手动指定的sheet页
//int sheetCount1= workbook.getNumberOfSheets();
Sheet sheet = workbook.getSheetAt(sheetCount); //读取第几个工作表sheet
int rowNum = sheet.getLastRowNum();//有多少行
for (int i = 1; i <= rowNum; i++) {
Row row = sheet.getRow(i);//第i行
if (row == null) {//过滤空行
continue;
}
List<String> list = new ArrayList<>();
int colCount = sheet.getRow(0).getLastCellNum();//用表头去算有多少列，不然从下面的行计算列的话，空的就不算了
for (int j = 0; j < colCount; j++) {//第j列://+1是因为最后一列是空 也算进去
Cell cell = row.getCell(j);
String cellValue;
boolean isMerge = false;
if (cell != null) {
isMerge = isMergedRegion(sheet, i, cell.getColumnIndex());
}
//判断是否具有合并单元格
if (isMerge) {
cellValue = getMergedRegionValue(sheet, row.getRowNum(), cell.getColumnIndex());
} else {
cellValue = getStringCellValue(cell);
}
list.add(cellValue);
}
values.add(list);
}
return values;
}
/**
* 判断整行是否为空
* @param row excel得行对象
* @param maxRow 有效值得最大列数
*/
private static boolean CheckRowNull(Row row, int maxRow) {
int num = 0;
for (int j = 0; j < maxRow; j++) {
Cell cell=row.getCell(j);
if (cell==null||cell.equals("")||cell.getCellType() == HSSFCell.CELL_TYPE_BLANK) {
num++;
}
}
if(maxRow==num) return true;
return false;
}
/**
* 根据sheet数获取excel的值 返回List<List<Map<String,String>>>的数据结构
* @param fileUrl 文件路径
* @param sheetNum 工作表（第几分页[1,2,3.....]）
* @return List<List<Map<String,String>>>
*/
public List<List<Map<String,String>>> getExcelMapVal(String fileUrl, int sheetNum) throws Exception{
List<List<Map<String,String>>> values = new ArrayList<List<Map<String,String>>>();
File file = new File(fileUrl);
InputStream is = new FileInputStream(file);
Workbook workbook = WorkbookFactory.create(is);
int sheetCount = sheetNum - 1; //workbook.getNumberOfSheets();//sheet 数量,可以只读取手动指定的sheet页
//int sheetCount1= workbook.getNumberOfSheets();
Sheet sheet = workbook.getSheetAt(sheetCount); //读取第几个工作表sheet
int rowNum = sheet.getLastRowNum();//有多少行
Row rowTitle = sheet.getRow(0);//第i行
int colCount = sheet.getRow(0).getLastCellNum();//用表头去算有多少列，不然从下面的行计算列的话，空的就不算了
for (int i = 1; i <= rowNum; i++) {
Row row = sheet.getRow(i);//第i行
if (row == null || CheckRowNull(row,colCount)) {//过滤空行
continue;
}
List<Map<String,String>> list = new ArrayList<Map<String,String>>();
for (int j = 0; j < colCount; j++) {//第j列://+1是因为最后一列是空 也算进去
Map<String,String> map=new HashMap<>();
Cell cell = row.getCell(j);
Cell cellTitle = rowTitle.getCell(j);
String cellValue;
String cellKey=getStringCellValue(cellTitle);
boolean isMerge = false;
if (cell != null) {
isMerge = isMergedRegion(sheet, i, cell.getColumnIndex());
}
//判断是否具有合并单元格
if (isMerge) {
cellValue = getMergedRegionValue(sheet, row.getRowNum(), cell.getColumnIndex());
} else {
cellValue = getStringCellValue(cell);
}
map.put(cellKey,cellValue);
list.add(map);
}
values.add(list);
}
return values;
}
/**
* 获取当前excel的工作表sheet总数
* @param fileUrl
* @return
* @throws Exception
*/
public int hasSheetCount(String fileUrl)throws Exception{
File file = new File(fileUrl);
InputStream is = new FileInputStream(file);
Workbook workbook = WorkbookFactory.create(is);
int sheetCount= workbook.getNumberOfSheets();
return sheetCount;
}
}四、测试类
（1）TitleEntity测试模拟的表头实体类
/**
* 表头的实体类： 在具体的项目里，可以是你从数据库里查询出来的数据
*/
public class TitleEntity {
public String t_id;
public String t_pid;
public String t_content;
public String t_fielName;
public TitleEntity(){}
public TitleEntity(String t_id, String t_pid, String t_content, String t_fielName) {
this.t_id = t_id;
this.t_pid = t_pid;
this.t_content = t_content;
this.t_fielName = t_fielName;
}
public String getT_id() {
return t_id;
}
public void setT_id(String t_id) {
this.t_id = t_id;
}
public String getT_pid() {
return t_pid;
}
public void setT_pid(String t_pid) {
this.t_pid = t_pid;
}
public String getT_content() {
return t_content;
}
public void setT_content(String t_content) {
this.t_content = t_content;
}
public String getT_fielName() {
return t_fielName;
}
public void setT_fielName(String t_fielName) {
this.t_fielName = t_fielName;
}
}
（2）测试类Main
兄弟们，需要运行哪些自己解开注释
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* 测试类
*/
public class TextMain {
public static void main(String[] args) throws Exception {
//// 单级的表头
// Map<String,String> map=new HashMap<String,String>();
// map.put("登录名","u_login_id");
// Map<String,String> map1=new HashMap<String,String>();
// map1.put("用户名","u_name");
// Map<String,String> map2=new HashMap<String,String>();
// map2.put("角色","u_role");
// Map<String,String> map3=new HashMap<String,String>();
// map3.put("部门","u_dep");//d_name
// Map<String,String> map4=new HashMap<String,String>();
// map4.put("用户类型","u_type");
// List<Map<String,String>> titleList=new ArrayList<>();
// titleList.add(map); titleList.add(map1); titleList.add(map2); titleList.add(map3); titleList.add(map4);
// //单级的 行内数据
// List<Map<String,String>> rowList=new ArrayList<>();
// for(int i=0;i<7;i++){
// Map m= new HashMap<String,String>();
// m.put("u_login_id","登录名"+i); m.put("u_name","张三"+i);
// m.put("u_role","角色"+i); m.put("u_dep","部门"+i);
// m.put("u_type","用户类型"+i);
// rowList.add(m);
// }
// ExcelTool excelTool = new ExcelTool("单级表头的表格",15,20);
// List<Column> titleData=excelTool.columnTransformer(titleList);
// excelTool.exportExcel(titleData,rowList,"D://outExcel.xls",true,false);
//List<Map>数据 多级表头,数据如下:
// 登录名 姓名 aa
// 角色 部门
// List<Map<String,String>> titleList=new ArrayList<>();
// Map<String,String> titleMap=new HashMap<String,String>();
// titleMap.put("id","11");titleMap.put("pid","0");titleMap.put("content","登录名");titleMap.put("fielName","u_login_id");
// Map<String,String> titleMap1=new HashMap<String,String>();
// titleMap1.put("id","1");titleMap1.put("pid","0");titleMap1.put("content","姓名");titleMap1.put("fielName","u_name");
// Map<String,String> titleMap2=new HashMap<String,String>();
// titleMap2.put("id","2");titleMap2.put("pid","0");titleMap2.put("content","角色加部门");titleMap2.put("fielName",null);
// Map<String,String> titleMap3=new HashMap<String,String>();
// titleMap3.put("id","3");titleMap3.put("pid","2");titleMap3.put("content","角色");titleMap3.put("fielName","u_role");
// Map<String,String> titleMap4=new HashMap<String,String>();
// titleMap4.put("id","4");titleMap4.put("pid","2");titleMap4.put("content","部门");titleMap4.put("fielName","u_dep");
// Map<String,String> titleMap5=new HashMap<String,String>();
// titleMap5.put("id","22");titleMap5.put("pid","0");titleMap5.put("content","角色加部门1");titleMap5.put("fielName",null);
// Map<String,String> titleMap6=new HashMap<String,String>();
// titleMap6.put("id","22_1");titleMap6.put("pid","22");titleMap6.put("content","角色1");titleMap6.put("fielName","u_role");
// Map<String,String> titleMap7=new HashMap<String,String>();
// titleMap7.put("id","22_2");titleMap7.put("pid","22");titleMap7.put("content","部门1");titleMap7.put("fielName","u_dep");
// titleList.add(titleMap); titleList.add(titleMap1); titleList.add(titleMap2); titleList.add(titleMap3); titleList.add(titleMap4);
// titleList.add(titleMap5); titleList.add(titleMap6); titleList.add(titleMap7);
// // 单级的 行内数据
// List<Map<String,String>> rowList=new ArrayList<>();
// for(int i=0;i<7;i++){
// Map m= new HashMap<String,String>();
// m.put("u_login_id","登录名"+i); m.put("u_name","张三"+i);
// m.put("u_role","角色"+i); m.put("u_dep","部门"+i);
// m.put("u_type","用户类型"+i);
// rowList.add(m);
// }
// ExcelTool excelTool = new ExcelTool("List<Map>数据 多级表头表格",20,20);
// List<Column> titleData=excelTool.columnTransformer(titleList,"id","pid","content","fielName","0");
// excelTool.exportExcel(titleData,rowList,"D://outExcel.xls",true,false);
//实体类（entity）数据 多级表头,数据如下:
// 登录名 姓名 aa
// 角色 部门
List<TitleEntity> titleList=new ArrayList<>();
TitleEntity titleEntity0=new TitleEntity("0",null,"总表",null);
TitleEntity titleEntity=new TitleEntity("11","0","登录名2","u_login_id");
TitleEntity titleEntity1=new TitleEntity("1","0","姓名","u_name");
TitleEntity titleEntity11=new TitleEntity("1_1","1","姓名1","u_name");
TitleEntity titleEntity2=new TitleEntity("2","0","角色加部门",null);
TitleEntity titleEntity3=new TitleEntity("3","2","角色","u_role");
TitleEntity titleEntity4=new TitleEntity("4","2","部门","u_dep");
TitleEntity titleEntity5=new TitleEntity("33","0","角色加部门1",null);
TitleEntity titleEntity6=new TitleEntity("33_1","33","角色33","u_role");
TitleEntity titleEntity7=new TitleEntity("33_2","33_1","部门33","u_dep");
TitleEntity titleEntity8=new TitleEntity("44","0","角色加部门2",null);
TitleEntity titleEntity9=new TitleEntity("44_1","44","角色44","u_role");
TitleEntity titleEntity10=new TitleEntity("44_2","44","部门44","u_dep");
TitleEntity titleEntity12=new TitleEntity("44_3","44_2","44_2","u_dep");
titleList.add(titleEntity0);
titleList.add(titleEntity); titleList.add(titleEntity1); titleList.add(titleEntity2); titleList.add(titleEntity3); titleList.add(titleEntity4);
titleList.add(titleEntity5); titleList.add(titleEntity6); titleList.add(titleEntity7);
titleList.add(titleEntity8);
titleList.add(titleEntity9);
titleList.add(titleEntity10); titleList.add(titleEntity11); titleList.add(titleEntity12);
//单级的 行内数据
List<Map<String,String>> rowList=new ArrayList<>();
for(int i=0;i<7;i++){
Map m= new HashMap<String,String>();
m.put("u_login_id","登录名"+i); m.put("u_name","张三"+i);
m.put("u_role","角色"+i); m.put("u_dep","部门"+i);
m.put("u_type","用户类型"+i);
rowList.add(m);
}
ExcelTool excelTool = new ExcelTool("实体类（entity）数据 多级表头表格",20,20);
List<Column> titleData = excelTool.columnTransformer(titleList,"t_id","t_pid","t_content","t_fielName","0");
excelTool.exportExcel(titleData,rowList,"D://outExcel.xls",true,true);
//读取excel
// ExcelTool excelTool = new ExcelTool();
// List<List<String>> readexecl=excelTool.getExcelValues("D://outExcel.xls",1);
// List<List<Map<String,String>>> readexeclC=excelTool.getExcelMapVal("D://outExcel.xls",1);
// int count= excelTool.hasSheetCount("D://outExcel.xls");
}
}
五、结果图片
（1）导出单级excel
（2）导出多级表头,处理数据是List<Map>
（3）导出多级表头,处理数据是entity
(4)导入单级表头的数据
