java POI实现excel导出

一、maven引入jar包

<!-- 导出 -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.12</version><!--3.16  -->
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-examples</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-excelant</artifactId>
<version>3.9</version>
</dependency>

二、工具类

package com.chinacoal.asset.utils;

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;

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 Unicode MS";
//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 Unicode MS";
//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.sheetName = sheetName;
this.fileName = fileName;
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
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;
}
/**
* 删除文件
* @param fileDir
* @return
*/
public boolean deleteExcel(String path){
boolean flag = false;
File file = new File(path);
// 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;
}
}

三、调用工具类实现导出

@RequestMapping("/exportExcel")
public  void  exportExcel(HttpServletRequest request,HttpServletResponse response){

ModelAndView view=new ModelAndView("/search.jsp");
AssetSearchCondition cond = new AssetSearchCondition(request, view);
cond.setPaging(new Paging(1, 1000));
List<Asset> list = assetService.query(cond);
PoiExcelExport pee = new PoiExcelExport(response, "report" ,"sheet1");

String titleColumn[] = {"code","name","type","number","buy_price","manufacture_name","manufacture_date_str","org_name","manufacture_date_str","manufacturer"};

String titleName[] = {"物料编码","物资名称","规格型号","数量","采购单价/万元","销售渠道","出厂年限","所属单位","存储地","生成厂商"};

int titleSize[] = {15,20,13,13,13,13,13,13,20,20};
pee.wirteExcel(titleColumn, titleName, titleSize, list);

}

四、效果如下