补充：合并单元格
sheet.mergeCells(起始单元格列坐标,起始单元格行坐标,结束单元格列坐标,结束单元格行坐标);
起始位坐标单元为(0,0)
sheet.mergeCells(0, 0, 2, 2);
sheet.mergeCells(3, 5, 3, 8);
1、页面方法和发起请求方式
/** 用户点击下载时调用download（）方法即可 */
function download(){
//去空格
tableTitle=tableTitle.trim();
var url="/report/download?tableTitle="+tableTitle+"&unit="+unit+"&searchId="+searchId +"&type="+tableType+
"&stringDate="+stringDate +"&submitType="+submitType;
//游览器打开一个新的选项卡发起请求
window.open(getRootPath()+url);
}
/** 获取项目根路径 */
function getRootPath(){
//获取当前网址
var curWwwPath=window.document.location.href;
//获取主机地址之后的目录，
var pathName=window.document.location.pathname;
var pos=curWwwPath.indexOf(pathName);
//获取主机地址，
var localhostPaht=curWwwPath.substring(0,pos);
//获取带"/"的项目名，
var projectName=pathName.substring(0,pathName.substr(1).indexOf('/')+1);
return(localhostPaht+projectName);
}2、Controller层，接收前端发起的导出下载请求和参数
//导出报表并下载
@RequestMapping(value="/download",produces="application/vnd.ms-excel")
@ResponseBody
public void download(HttpServletRequest request,HttpServletResponse response,
String tableTitle,String unit, String searchId, String type, String stringDate, String submitType) throws ParseException, IOException, WriteException {
//设置文件名
String fileName =tableTitle+".xls";
//设置文件临时存放的路径
String filePath = request.getServletContext().getRealPath("/") + fileName;
//这句是调用方法获取要导出的记录，被我封装成了Map对象
Map<String,Object> findData=reportService.getSearchData(searchId,type,stringDate,submitType,1,40);
//取出数据集，可直接获取记录的list集即可
List<Report> reportList= (List<Report>) findData.get("data");
//我写好了一个导出Excel并下载和删除文件的class类，调用类方法
DownloadFile.exportDownload(request,response,fileName,tableTitle,unit,filePath,reportList);
}3、自己编写的下载类，我把方法写成了静态的所以可以直接以类名点方法的方式访问，否则需要实例化类后方能访问
package com.common.utils;
import com.entity.Report;
import jxl.Workbook;
import jxl.format.Border;
import jxl.format.BorderLineStyle;
import jxl.format.Colour;
import jxl.format.UnderlineStyle;
import jxl.write.*;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.List;
public class DownloadFile {
public static void exportDownload(HttpServletRequest request, HttpServletResponse response,
String fileName,String tableTitle,String unit, String filePath, List<Report> dataList) throws IOException, WriteException {
//导出创建Excel存储在服务器指定路径的本地磁盘
writeToExcel(tableTitle,filePath,unit,dataList);
//下载导出的Excel文件
downloadFile(response, filePath,fileName);
//删除临时存储的Excel文件
deleteFile(filePath);
}
private static void writeToExcel(String tableTitle,String filePath,String unit,List<Report> sheetDatas) throws IOException, WriteException {
File file = new File(filePath);
if(!file.exists()){
file.createNewFile();
}
OutputStream os = new FileOutputStream(file);
//创建excel文件
WritableWorkbook book = Workbook.createWorkbook(os);
//设置表头样式
WritableFont titleFont = new WritableFont(WritableFont.createFont("微软雅黑"),12,WritableFont.BOLD,false,UnderlineStyle.NO_UNDERLINE,Colour.WHITE); // 定义格式 字体 下划线 斜体 粗体 颜色
WritableCellFormat titleFormat = new WritableCellFormat(titleFont);
titleFormat.setBackground(Colour.GRAY_50);
titleFormat.setBorder(Border.ALL, BorderLineStyle.THIN);
//设置单元格样式
WritableFont cellFont = new WritableFont(WritableFont.createFont("微软雅黑"),10,WritableFont.NO_BOLD,false,UnderlineStyle.NO_UNDERLINE,Colour.BLACK);
String sheetName = "sheet1";
//打开文件创建sheet
WritableSheet sheet = book.createSheet(sheetName,0);
sheet.getSettings().setDefaultColumnWidth(20);
//去掉整个sheet中的网格线
// sheet.getSettings().setShowGridLines(false);
//sheet首行添加标题
sheet.addCell(new Label(0,0,unit));
sheet.addCell(new Label(1,0,"当前值"));
sheet.addCell(new Label(2,0,"同比值"));
sheet.addCell(new Label(3,0,"同比增幅"));
sheet.addCell(new Label(4,0,"环比值"));
sheet.addCell(new Label(5,0,"环比增幅"));
int i=1;
for(Report report:sheetDatas){
//具体行数据的填充
sheet.addCell(new Label(0,i,report.getLogDate().toString()));
sheet.addCell(new Label(1,i,report.getValue()+""));
sheet.addCell(new Label(2,i,report.getOther()+""));
sheet.addCell(new Label(3,i,report.getOtherPercent()));
sheet.addCell(new Label(4,i,report.getRing()+""));
sheet.addCell(new Label(5,i,report.getRingPercent()));
i++;
}
book.write();
book.close();
os.close();
}
private static void downloadFile(HttpServletResponse response,String inputFilePath,String outPutFileName) throws IOException {
// 1.设置文件ContentType类型，这样设置，会自动判断下载文件类型
response.reset();
response.setContentType("multipart/form-data");
// 2.设置文件头：最后一个参数是设置下载文件名
response.setHeader("Content-Disposition", "attachment;fileName="+java.net.URLEncoder.encode(outPutFileName, "UTF-8"));
response.setContentType("application/vnd.ms-excel");
ServletOutputStream out;
File file = new File(inputFilePath);
FileInputStream inputStream = new FileInputStream(file);//文件输入流，读取excle文件
// 3.通过response获取ServletOutputStream对象
out = response.getOutputStream();
int b = 0;
byte[] buffer = new byte[512];
while (b != -1) { //当excle文件存在内容就一直读取，-1为内容为空
b = inputStream.read(buffer);
// 4.写到输出流(out)中
if (buffer.length > 2048) {
out.write(buffer, 0, b);
} else {
out.write(buffer, 0, buffer.length);
}
}
inputStream.close();
out.close();
out.flush();
}
private static void deleteFile(String filePath){
File file = new File(filePath);
if(file.exists()){
file.delete();
}
}
}
4、Maven的pom文件加入这个jxl才能使用WritableWorkbook生成Excel文件
<!-- https://mvnrepository.com/artifact/net.sourceforge.jexcelapi/jxl -->
<dependency>
<groupId>net.sourceforge.jexcelapi</groupId>
<artifactId>jxl</artifactId>
<version>2.6.12</version>
</dependency>