POI导出数据为Excel文件

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.util.List;


import javax.servlet.http.HttpServletResponse;


import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;


/**
 * @author 夏世雄 E-mail:[email protected]
 * @version 创建时间：2018年3月22日 下午12:09:53 POI导出excle文件工具类
 */
public class PoiExcelExport {
HttpServletResponse response;
// 文件名
private String fileName;
// 文件保存路径
private String fileDir;
// sheet名
private String sheetName;
// 表头字体
private String titleFontType = "Arial";
// 表头背景色
private String titleBackColor = "C1FBEE";
// 表头字号
private short titleFontSize = 12;
// 添加自动筛选的列 如 A:M
private String address = "";
// 正文字体
private String contentFontType = "Arial";
// 正文字号
private short contentFontSize = 12;
// Float类型数据小数位
private String floatDecimal = ".00";
// Double类型数据小数位
private String doubleDecimal = ".00";
// 设置列的公式
private String colFormula[] = null;


DecimalFormat floatDecimalFormat = new DecimalFormat(floatDecimal);
DecimalFormat doubleDecimalFormat = new DecimalFormat(doubleDecimal);


private HSSFWorkbook workbook = null;


public PoiExcelExport(String fileDir, String sheetName) {
this.fileDir = fileDir;
this.sheetName = sheetName;
workbook = new HSSFWorkbook();
}


public PoiExcelExport(HttpServletResponse response, String fileName, String sheetName) {
this.response = response;
this.fileName = fileName;
this.sheetName = sheetName;
workbook = new HSSFWorkbook();
}


/**
* 设置表头字体.
* 
* @param titleFontType
*/
public void setTitleFontType(String titleFontType) {
this.titleFontType = titleFontType;
}


/**
* 设置表头背景色.
* 
* @param titleBackColor 十六进制
*/
public void setTitleBackColor(String titleBackColor) {
this.titleBackColor = titleBackColor;
}


/**
* 设置表头字体大小.
* 
* @param titleFontSize
*/
public void setTitleFontSize(short titleFontSize) {
this.titleFontSize = titleFontSize;
}


/**
* 设置表头自动筛选栏位,如A:AC.
* 
* @param address
*/
public void setAddress(String address) {
this.address = address;
}


/**
* 设置正文字体.
* 
* @param contentFontType
*/
public void setContentFontType(String contentFontType) {
this.contentFontType = contentFontType;
}


/**
* 设置正文字号.
* 
* @param contentFontSize
*/
public void setContentFontSize(short contentFontSize) {
this.contentFontSize = contentFontSize;
}


/**
* 设置float类型数据小数位 默认.00
* 
* @param doubleDecimal 如 ".00"
*/
public void setDoubleDecimal(String doubleDecimal) {
this.doubleDecimal = doubleDecimal;
}


/**
* 设置doubel类型数据小数位 默认.00
* 
* @param floatDecimalFormat 如 ".00
*/
public void setFloatDecimalFormat(DecimalFormat floatDecimalFormat) {
this.floatDecimalFormat = floatDecimalFormat;
}


/**
* 设置列的公式
* 
* @param colFormula 存储i-1列的公式 涉及到的行号使用@替换 如A@+B@
*/
public void setColFormula(String[] colFormula) {
this.colFormula = colFormula;
}


/**
* 写excel.
* 
* @param titleColumn 对应bean的属性名
* @param titleName excel要导出的表名
* @param titleSize 列宽
* @param dataList 数据
*/
public void wirteExcel(String titleColumn[], String titleName[], int titleSize[],
List<?> dataList) {
// 添加Worksheet（不添加sheet时生成的xls文件打开时会报错)
Sheet sheet = workbook.createSheet(this.sheetName);
// 新建文件
OutputStream out = null;
try {
if (fileDir != null) {
// 有文件路径,保存到本地
out = new FileOutputStream(fileDir);
} else {
// 否则，直接写到输出流中
out = response.getOutputStream();
fileName = fileName + ".xls";
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition",
"attachment; filename=" + URLEncoder.encode(fileName, "UTF-8"));
}


// 写入excel的表头
Row titleNameRow = workbook.getSheet(sheetName).createRow(0);
// 设置样式
HSSFCellStyle titleStyle = workbook.createCellStyle();
titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, titleFontType,
(short) titleFontSize);
titleStyle = (HSSFCellStyle) setColor(titleStyle, titleBackColor, (short) 10);


for (int i = 0; i < titleName.length; i++) {
sheet.setColumnWidth(i, titleSize[i] * 256); // 设置宽度
Cell cell = titleNameRow.createCell(i);
cell.setCellStyle(titleStyle);
cell.setCellValue(titleName[i].toString());
}


// 为表头添加自动筛选
if (!"".equals(address)) {
CellRangeAddress c = (CellRangeAddress) CellRangeAddress.valueOf(address);
sheet.setAutoFilter(c);
}


// 通过反射获取数据并写入到excel中
if (dataList != null && dataList.size() > 0) {
// 设置样式
HSSFCellStyle dataStyle = workbook.createCellStyle();
titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, contentFontType,
(short) contentFontSize);


if (titleColumn.length > 0) {
for (int rowIndex = 1; rowIndex <= dataList.size(); rowIndex++) {
Object obj = dataList.get(rowIndex - 1); // 获得该对象
Class clsss = obj.getClass(); // 获得该对对象的class实例
Row dataRow = workbook.getSheet(sheetName).createRow(rowIndex);
for (int columnIndex = 0; columnIndex < titleColumn.length; columnIndex++) {
String title = titleColumn[columnIndex].toString().trim();
if (!"".equals(title)) { // 字段不为空
// 使首字母大写
String UTitle = Character.toUpperCase(title.charAt(0))
+ title.substring(1, title.length()); // 使其首字母大写;
String methodName = "get" + UTitle;


// 设置要执行的方法
Method method = clsss.getDeclaredMethod(methodName);


// 获取返回类型
String returnType = method.getReturnType().getName();


String data = method.invoke(obj) == null ? ""
: method.invoke(obj).toString();
Cell cell = dataRow.createCell(columnIndex);
if (data != null && !"".equals(data)) {
if ("int".equals(returnType)) {
cell.setCellValue(Integer.parseInt(data));
} else if ("long".equals(returnType)) {
cell.setCellValue(Long.parseLong(data));
} else if ("float".equals(returnType)) {
cell.setCellValue(
floatDecimalFormat.format(Float.parseFloat(data)));
} else if ("double".equals(returnType)) {
cell.setCellValue(doubleDecimalFormat
.format(Double.parseDouble(data)));
} else {
cell.setCellValue(data);
}
}
} else { // 字段为空 检查该列是否是公式
if (colFormula != null) {
String sixBuf = colFormula[columnIndex].replace("@",
(rowIndex + 1) + "");
Cell cell = dataRow.createCell(columnIndex);
cell.setCellFormula(sixBuf.toString());
}
}
}
}


}
}


workbook.write(out);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}


/**
* 将16进制的颜色代码写入样式中来设置颜色
* 
* @param style 保证style统一
* @param color 颜色：66FFDD
* @param index 索引 8-64 使用时不可重复
* @return
*/
public CellStyle setColor(CellStyle style, String color, short index) {
if (color != "" && color != null) {
// 转为RGB码
int r = Integer.parseInt((color.substring(0, 2)), 16); // 转为16进制
int g = Integer.parseInt((color.substring(2, 4)), 16);
int b = Integer.parseInt((color.substring(4, 6)), 16);
// 自定义cell颜色
HSSFPalette palette = workbook.getCustomPalette();
palette.setColorAtIndex((short) index, (byte) r, (byte) g, (byte) b);


style.setFillPattern(CellStyle.SOLID_FOREGROUND);
style.setFillForegroundColor(index);
}
return style;
}


/**
* 设置字体并加外边框
* 
* @param style 样式
* @param style 字体名
* @param style 大小
* @return
*/
public CellStyle setFontAndBorder(CellStyle style, String fontName, short size) {
HSSFFont font = workbook.createFont();
font.setFontHeightInPoints(size);
font.setFontName(fontName);
// font.setBold(true);
style.setFont(font);
style.setBorderBottom(CellStyle.BORDER_THIN); // 下边框
style.setBorderLeft(CellStyle.BORDER_THIN);// 左边框
style.setBorderTop(CellStyle.BORDER_THIN);// 上边框
style.setBorderRight(CellStyle.BORDER_THIN);// 右边框
return style;
}


/**
* 删除文件
* 
* @param fileDir
* @return
*/
public boolean deleteExcel() {
boolean flag = false;
File file = new File(this.fileDir);
// 判断目录或文件是否存在
if (!file.exists()) { // 不存在返回 false
return flag;
} else {
// 判断是否为文件
if (file.isFile()) { // 为文件时调用删除文件方法
file.delete();
flag = true;
}
}
return flag;
}

}




//service层使用示例
public  boolean exportList (HttpServletResponse response) {


     //设置excle表头
   String[] headers = new String[] {"记录ID","用户ID","用户姓名","兑换物品名称","消耗积分","规格","兑换数量","备注","兑换状态","兑换时间","处理状态","操作"};
   //设置要展示数据每列所对应pojo的属性名
 String titleColumn[]={"id", "mobile", "realityname","commodity","reduceintegral","types","exNumber","remarks","reducetype","time","state","flag"};   
  //设置列宽
  int titleSize[] = {13,13,13,30,13,13,13,30,13,20,13,13};

    //要导出的数据库查询的数据

   List<Object>  showExcleList = someService.findSomeList();

   //表名

 String fileName = "商品兑换统计表";

  String sheetName = "商品兑换";
  //创建导出工具类，文件名和sheet名
  PoiExcelExport pee = new PoiExcelExport(response, fileName, sheetName);
          try {
//调用  
pee.wirteExcel(titleColumn, headers, titleSize, showExcleList);
logger.error("导出列表成功");
return true;


}  catch (Exception e) {

e.printStackTrace();
logger.error("导出列表失败");
return false;
}
}