How to export EXCEL table from JAVA

JAVA method of exporting an EXCEL table: first use HSSFWorkbook to open or create an "Excel file object"; then use the Sheet object to return the row object, and use the row object to get the Cell object; then read and write the Cell object; and finally generate file into the responsive front-end page.

How to export EXCEL table from JAVA:

Basic steps:

First, we What you should know is that an Excel file corresponds to a workbook, a workbook is composed of multiple sheets, and a sheet is composed of multiple rows and cells.

Then the correct sequence when we use poi to export an Excel table should be:

1. Use HSSFWorkbook to open or create an "Excel file object"

2. Use the HSSFWorkbook object to return or create the Sheet object

3. Use the Sheet object to return the row object, and use the row object to get the Cell object

4. Read and write the Cell object.

5. Put the generated HSSFWorkbook into HttpServletResponse and respond to the front-end page

Export Excel application instance:

Tool class code:

package com.yq.util;
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;
public class ExcelUtil {
    /**
     * 导出Excel
     * @param sheetName sheet名称
     * @param title 标题
     * @param values 内容
     * @param wb HSSFWorkbook对象
     * @return
     */
    public static HSSFWorkbook getHSSFWorkbook(String sheetName,String []title,String [][]values, HSSFWorkbook wb){
        // 第一步，创建一个HSSFWorkbook，对应一个Excel文件
        if(wb == null){
            wb = new HSSFWorkbook();
        }
        // 第二步，在workbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet(sheetName);
        // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
        HSSFRow row = sheet.createRow(0);
        // 第四步，创建单元格，并设置值表头 设置表头居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
        //声明列对象
        HSSFCell cell = null;
        //创建标题
        for(int i=0;i<title.length;i++){
            cell = row.createCell(i);
            cell.setCellValue(title[i]);
            cell.setCellStyle(style);
        }
        //创建内容
        for(int i=0;i<values.length;i++){
            row = sheet.createRow(i + 1);
            for(int j=0;j<values[i].length;j++){
                //将内容按顺序赋给对应的列对象
                row.createCell(j).setCellValue(values[i][j]);
            }
        }
        return wb;
    }
}

Controller code:

@Controller
@RequestMapping(value = "/report")
public class ReportFormController extends BaseController {
    @Resource(name = "reportService")
    private ReportManager reportService;
    /**
     * 导出报表
     * @return
     */
    @RequestMapping(value = "/export")
    @ResponseBody
    public void export(HttpServletRequest request,HttpServletResponse response) throws Exception {
           //获取数据
           List<PageData> list = reportService.bookList(page);
           //excel标题
        　　String[] title = {"名称","性别","年龄","学校","班级"};
         　//excel文件名
        　 String fileName = "学生信息表"+System.currentTimeMillis()+".xls";
  　　　　　//sheet名
        　 String sheetName = "学生信息表";
　　　　　　for (int i = 0; i < list.size(); i++) {
            content[i] = new String[title.length];
            PageData obj = list.get(i);
            content[i][0] = obj.get("stuName").tostring();
            content[i][1] = obj.get("stuSex").tostring();
            content[i][2] = obj.get("stuAge").tostring();
            content[i][3] = obj.get("stuSchoolName").tostring();
            content[i][4] = obj.get("stuClassName").tostring();
　　　　　　}
　　　　　　//创建HSSFWorkbook 
　　　　　　HSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName, title, content, null);
　　　　　　//响应到客户端
　　　　　　try {
　　　　　　　　this.setResponseHeader(response, fileName);
       　　　　OutputStream os = response.getOutputStream();
       　　　　wb.write(os);
       　　　　os.flush();
       　　　　os.close();
 　　　　　　} catch (Exception e) {
       　　　　e.printStackTrace();
 　　　　　　}
　　}
    //发送响应流方法
    public void setResponseHeader(HttpServletResponse response, String fileName) {
        try {
            try {
                fileName = new String(fileName.getBytes(),"ISO8859-1");
            } catch (UnsupportedEncodingException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            response.setContentType("application/octet-stream;charset=ISO8859-1");
            response.setHeader("Content-Disposition", "attachment;filename="+ fileName);
            response.addHeader("Pargam", "no-cache");
            response.addHeader("Cache-Control", "no-cache");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

Front-end page code:

<button id="js-export" type="button" class="btn btn-primary">导出Excel</button>
$(&#39;#js-export&#39;).click(function(){
            window.location.href="/report/exportBooksTable.do;
});

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