Java学习——Spring MVC从无到有利用POI创建并下载Excel

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.11</version>
</dependency>

//列出部分引用
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
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.CellRangeAddress;


String timeStamp= new SimpleDateFormat("yyyy-MM-dd").format(new Date());
        //创建工作表，sheet对象，行以及单元格。
        HSSFWorkbook wb=new HSSFWorkbook();
        HSSFSheet sheet=wb.createSheet("History");
        HSSFRow row=sheet.createRow(0);
        //字体居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        HSSFCell cell=row.createCell(0);
        cell.setCellStyle(style);
        cell.setCellValue("validatorHistory"+timeStamp);
        sheet.addMergedRegion(new CellRangeAddress(0,0,0,5));//合并单元格参数为起始行，截至行，起始列， 截至列
        //在sheet中创建第二行
        HSSFRow row2=sheet.createRow(1);
        //创建单元格并设置单元格内容  
        row2.createCell(0).setCellValue("Name1");
        row2.createCell(1).setCellValue("Name2");
        row2.createCell(2).setCellValue("Time1");
        row2.createCell(3).setCellValue("Time2");
        row2.createCell(4).setCellValue("person1");
        row2.createCell(5).setCellValue("iscomplete");
        // 调整列宽  
        sheet.setColumnWidth(0, (short)5500);
        sheet.setColumnWidth(1, (short)5500);
        sheet.setColumnWidth(2, (short)5500);
        sheet.setColumnWidth(3, (short)5500);
        sheet.setColumnWidth(4, (short)6000);
        sheet.setColumnWidth(5, (short)4000);
        //取出数据库中的值放入表格中
        int rowNum = 2;
        List<类> history=*****Repository.get*****;//从数据库取出数据
        if(history!=null && history.size()>0){
            for(ValidatorTrigger vt:history){
                HSSFRow vtrow=sheet.createRow(rowNum);
                vtrow.createCell(0).setCellValue(vt.getName1());
                vtrow.createCell(1).setCellValue(vt.getName2());
                vtrow.createCell(2).setCellValue(vt.getTime1());
                vtrow.createCell(3).setCellValue(vt.getTime2());
                vtrow.createCell(4).setCellValue(vt.getPerson1());
                vtrow.createCell(5).setCellValue(vt.isComplete());
                rowNum++;
            }
        }
                //输出Excel文件
                 FileOutputStream output=new FileOutputStream("d:\\workbook.xls");
                wb.write(out);
            out.flush();                    

//只贴了相关代码
<div class="down col-xs-6 col-md-offset-3">
            <a id="download" href="#" class="btn btn-info btn-sm"> <span class="glyphicon glyphicon-download-alt"></span>DownloadHistory</a>
</div>

$(‘#download‘).click(function(){
    var name1=$("select[id=name1]").val();
    var name2=$("select[id=name2]").val();
     location.href="/history/download?name1="+name1+"&name2="+name2;  
});

    @ResponseBody
    @RequestMapping(value = "/history/download", method = RequestMethod.GET)
    public void download(HttpServletRequest request, HttpServletResponse response) throws IOException{
        String name1=request.getParameter("name1");
        String name2=request.getParameter("name2");
        request.setCharacterEncoding("UTF-8");  //防止字体乱码
        response.setCharacterEncoding("UTF-8"); 
        this.***Service.downloadHistory(name1,name2,request,response);
    }

public void downloadHistory(String name1, String name2,HttpServletRequest request, HttpServletResponse response) throws IOException{
        OutputStream out = null;
        String timeStamp= new SimpleDateFormat("yyyy-MM-dd").format(new Date());
        //创建工作表，sheet对象，行以及单元格。        
        //在sheet中创建第二行    
        //创建单元格并设置单元格内容      
        // 调整列宽          
        //取出数据库中的值放入表格中
//上面部分代码和之前的一样，在输出Excel文件开始不同，如下        
        //输出Excel文件
        try{
            response.reset();
            response.setContentType("application/x-download");
            response.setCharacterEncoding("utf-8");
            String fname = "history" + timeStamp;// Excel文件名
            response.setHeader("Content-disposition", "attachment; filename="+fname+".xls");
            out = response.getOutputStream();
            wb.write(out);
            out.flush();
        }catch(IOException e) {
            e.printStackTrace();
        }finally {
            out.close();
        }
    }