写excel:
package boot.spring.poi;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
public class WriteExcel {
//导出表的列名
private String[] rowName;
//每行作为一个Object对象
private List<Object[]> dataList = new ArrayList<Object[]>();
//构造方法，传入要导出的数据
public WriteExcel(String[] rowName,List<Object[]> dataList){
this.dataList = dataList;
this.rowName = rowName;
}
/*
* 导出数据
* */
public InputStream export() throws Exception{
HSSFWorkbook workbook = new HSSFWorkbook(); // 创建工作簿对象
HSSFSheet sheet = workbook.createSheet("sheet1"); // 创建工作表
//sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面 - 可扩展】
HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
HSSFCellStyle style = this.getStyle(workbook); //单元格样式对象
// 定义所需列数
int columnNum = rowName.length;
HSSFRow rowRowName = sheet.createRow(0); // 在索引2的位置创建行(最顶端的行开始的第二行)
// 将列头设置到sheet的单元格中
for(int n=0;n<columnNum;n++){
HSSFCell cellRowName = rowRowName.createCell(n); //创建列头对应个数的单元格
cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); //设置列头单元格的数据类型
HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
cellRowName.setCellValue(text); //设置列头单元格的值
cellRowName.setCellStyle(columnTopStyle); //设置列头单元格样式
}
//将查询出的数据设置到sheet对应的单元格中
for(int i=0;i<dataList.size();i++){
Object[] obj = dataList.get(i);//遍历每个对象
HSSFRow row = sheet.createRow(i+1);//创建所需的行数
for(int j=0; j<obj.length; j++){
HSSFCell cell = null; //设置单元格的数据类型
cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING);
if(!"".equals(obj[j]) && obj[j] != null){
cell.setCellValue(obj[j].toString()); //设置单元格的值
}
cell.setCellStyle(style); //设置单元格样式
}
}
//让列宽随着导出的列长自动适应
for (int colNum = 0; colNum < columnNum; colNum++) {
int columnWidth = sheet.getColumnWidth(colNum) / 256;
for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
HSSFRow currentRow;
//当前行未被使用过
if (sheet.getRow(rowNum) == null) {
currentRow = sheet.createRow(rowNum);
} else {
currentRow = sheet.getRow(rowNum);
}
if (currentRow.getCell(colNum) != null) {
HSSFCell currentCell = currentRow.getCell(colNum);
if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
int length = currentCell.getStringCellValue().getBytes().length;
if (columnWidth < length) {
columnWidth = length;
}
}
}
}
if(colNum == 0){
sheet.setColumnWidth(colNum, (columnWidth-2) * 256);
}else{
sheet.setColumnWidth(colNum, (columnWidth+4) * 256);
}
}
String fileName = "Excel-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
String headStr = "attachment; filename=\"" + fileName + "\"";
// response = getResponse();
// response.setContentType("APPLICATION/OCTET-STREAM");
// response.setHeader("Content-Disposition", headStr);
// OutputStream out = response.getOutputStream();
// FileOutputStream out=new FileOutputStream("C:\\test.xls");
ByteArrayOutputStream os=new ByteArrayOutputStream();
try {
workbook.write(os);
} catch (IOException e) {
e.printStackTrace();
}
byte[] content=os.toByteArray();
InputStream is=new ByteArrayInputStream(content);
return is;
}
/*
* 列头单元格样式
*/
public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {
// 设置字体
HSSFFont font = workbook.createFont();
//设置字体大小
font.setFontHeightInPoints((short)11);
//字体加粗
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
//设置字体名字
font.setFontName("Courier New");
//设置样式;
HSSFCellStyle style = workbook.createCellStyle();
//设置底边框;
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
//设置底边框颜色;
style.setBottomBorderColor(HSSFColor.BLACK.index);
//设置左边框;
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
//设置左边框颜色;
style.setLeftBorderColor(HSSFColor.BLACK.index);
//设置右边框;
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
//设置右边框颜色;
style.setRightBorderColor(HSSFColor.BLACK.index);
//设置顶边框;
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
//设置顶边框颜色;
style.setTopBorderColor(HSSFColor.BLACK.index);
//在样式用应用设置的字体;
style.setFont(font);
//设置自动换行;
style.setWrapText(false);
//设置水平对齐的样式为居中对齐;
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//设置垂直对齐的样式为居中对齐;
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
return style;
}
/*
* 列数据信息单元格样式
*/
public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
// 设置字体
HSSFFont font = workbook.createFont();
//设置字体大小
//font.setFontHeightInPoints((short)10);
//字体加粗
//font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
//设置字体名字
font.setFontName("Courier New");
//设置样式;
HSSFCellStyle style = workbook.createCellStyle();
//设置底边框;
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
//设置底边框颜色;
style.setBottomBorderColor(HSSFColor.BLACK.index);
//设置左边框;
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
//设置左边框颜色;
style.setLeftBorderColor(HSSFColor.BLACK.index);
//设置右边框;
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
//设置右边框颜色;
style.setRightBorderColor(HSSFColor.BLACK.index);
//设置顶边框;
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
//设置顶边框颜色;
style.setTopBorderColor(HSSFColor.BLACK.index);
//在样式用应用设置的字体;
style.setFont(font);
//设置自动换行;
style.setWrapText(false);
//设置水平对齐的样式为居中对齐;
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//设置垂直对齐的样式为居中对齐;
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
return style;
}
/*
public static void main(String[] args) throws Exception {
String[] rowsName = new String[]{"序号","状态","录入人","录入时间"};
List<Object[]> dataList = new ArrayList<Object[]>();
Object[] obj1=new Object[4];
obj1[0]="1";obj1[1]="ok";obj1[2]="hello";obj1[3]="wsz";
dataList.add(obj1);
Object[] obj2=new Object[4];
obj2[0]="2";obj2[1]="dsa";obj2[2]="wolrd";obj2[3]="python";
dataList.add(obj2);
WriteExcel ex = new WriteExcel(rowsName, dataList);
ex.export();
}
*/
}
读excel类：
package boot.spring.poi;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;
public class ReadExcel {
//判断指定的单元格是否是合并单元格
private static 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
public static CellRegion getMergedRegionValue(Sheet sheet ,int row , int column){
CellRegion r=new CellRegion();
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);
r.startrownum=firstRow;
r.endrownum=lastRow;
r.value=getCellValue(fCell);
return r;
}
}
}
return null ;
}
/**
* 获取单元格的值
* @param cell
* @return
*/
public static String getCellValue(Cell cell){
if(cell == null)
return "";
if(cell.getCellType() == Cell.CELL_TYPE_STRING){
return cell.getStringCellValue();
}else if(cell.getCellType() == Cell.CELL_TYPE_BOOLEAN){
return String.valueOf(cell.getBooleanCellValue());
}else if(cell.getCellType() == Cell.CELL_TYPE_FORMULA){
return String.valueOf(cell.getNumericCellValue()) ;
}else if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
return String.valueOf(cell.getNumericCellValue());
}
return "";
}
//求单元格或者合并单元格的高度
public static int getheight(Sheet sheet,int rownum,int colnum){
if(isMergedRegion(sheet, rownum, colnum)){
CellRegion r=getMergedRegionValue(sheet, rownum, colnum);
return r.endrownum-r.startrownum+1;
}else
return 1;
}
//获取合并或未合并的任意单元格
public static String getvalue(Sheet sheet,int rownum,int colnum){
if(isMergedRegion(sheet,rownum,colnum)){
CellRegion c=getMergedRegionValue(sheet,rownum,colnum);
return c.value;
}else{
Row row=sheet.getRow(rownum);
Cell cell=row.getCell(colnum);
return getCellValue(cell);
}
}
/*
public static void main(String[] args) {
HSSFWorkbook wb = null;
POIFSFileSystem fs = null;
try {
//设置要读取的文件路径
fs = new POIFSFileSystem(new FileInputStream("d:\\table.xls"));
//HSSFWorkbook相当于一个excel文件，HSSFWorkbook是解析excel2007之前的版本（xls）
//之后版本使用XSSFWorkbook（xlsx）
wb = new HSSFWorkbook(fs);
//获得sheet工作簿
HSSFSheet sheet = wb.getSheetAt(0);
//获得行
HSSFRow row = sheet.getRow(6);
CellRegion r=new CellRegion();
// System.out.println(sheet.getLastRowNum());
// r = getMergedRegionValue(sheet, 78,26);
// if(r!=null)
System.out.print(r.value+" ");
System.out.println(getvalue(sheet, 6,1));
} catch (Exception e) {
e.printStackTrace();
}
}
*/
}
合并单元格：
package boot.spring.poi;
public class CellRegion {
//记录合并单元格的每行记录起始和终点的行号
int startrownum;
int endrownum;
String value;
}
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