SpringBoot+jxls根据Excel模板实现数据填写并导出

 项目结构

 pom.xml

         
        
            net.sf.jxls
            jxls-core
            1.0.6
            compile
        

学生信息表模板：

ExcelUtiles

import net.sf.jxls.transformer.XLSTransformer;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.util.ResourceUtils;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.Map;

/**
 * @ProjectName: Student
 * @Package: cn.utils
 * @Author: huat
 * @Date: 2020/5/7 8:53
 * @Version: 1.0
 */
public class ExcelUtiles {
    /**
     * 输出表格
     * @param map 表格中数据
     * @param response 响应
     * @param excelName 表格名称
     * @param excelPath 表格模板保存的路径
     */
    public static void outExcel(Map map,HttpServletResponse response,String excelName,String excelPath){
        File file=null;
        try {
            file= ResourceUtils.getFile(excelPath);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        //配置下载路径
        String path = StaticUrl.getFileUrl()+"down\";
        createDir(new File(path));

        //根据模板生成新的excel
        File excelFile = createNewFile(map, file, path,excelName);

        //浏览器端下载文件
        try {
            downloadFile(response, excelFile,excelName);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        //删除服务器生成文件
        deleteFile(excelFile);

    }

    /**
     * 根据excel模板生成新的excel
     * @param beans 表格中的数据
     * @param file 文件
     * @param path 生成文件的位置
     * @param excelName 文件名称
     * @return
     */
    private static File createNewFile(Map beans, File file, String path,String excelName) {
        XLSTransformer transformer = new XLSTransformer();


        File newFile = new File(path + excelName+".xlsx");


        try (InputStream in = new BufferedInputStream(new FileInputStream(file));
             OutputStream out = new FileOutputStream(newFile)) {
            Workbook workbook = transformer.transformXLS(in, beans);
            workbook.write(out);
            out.flush();
            return newFile;
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
        return newFile;
    }

    /**
     * 将服务器新生成的excel从浏览器下载
     * @param response 响应
     * @param excelFile 表格文件
     * @param excelName 表格名称
     * @throws UnsupportedEncodingException
     */
    private static void downloadFile(HttpServletResponse response, File excelFile,String excelName) throws UnsupportedEncodingException {

        /* 设置文件头：最后一个参数是设置下载文件名 */
        response.setHeader("Content-type","application/vnd.ms-excel");
        // 解决导出文件名中文乱码
        response.setCharacterEncoding("UTF-8");
        response.setHeader("Content-Disposition","attachment;filename="+new String(excelName.getBytes("UTF-8"),"ISO-8859-1")+".xlsx");

        try (
                InputStream ins = new FileInputStream(excelFile);
                OutputStream os = response.getOutputStream()
        ) {
            byte[] b = new byte[1024];
            int len;
            while ((len = ins.read(b)) > 0) {
                os.write(b, 0, len);
            }
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }

    /**
     * 浏览器下载完成之后删除服务器生成的文件
     * 也可以设置定时任务去删除服务器文件
     *
     * @param excelFile
     */
    private static void deleteFile(File excelFile) {

        excelFile.delete();
    }

    //如果目录不存在创建目录 存在则不创建
    private static void createDir(File file) {
        if (!file.exists()) {
            file.mkdirs();
        }
    }
}

 controller

@RequestMapping("downExcel")
    public void downExecl(HttpServletResponse response){
        Map map=new HashMap();
        map.put("name","学生信息表");
       //获取学生信息
        map.put("studentList",studentService.getStudent());
       //"classpath:static/excel/学生表格.xlsx"   表格模板保存路径，classpath:代表resources路径
        ExcelUtiles.outExcel(map,response,"学生信息表",StaticUrl.getFileUrl()+"学生信息表.xlsx");
    }

StaticUrl

import org.springframework.util.ResourceUtils;

import java.io.FileNotFoundException;

/**
 * @ProjectName: ycbdqn
 * @Package: cn.utils 上传文件路径
 * @Author: huat
 * @Date: 2020/3/5 13:39
 * @Version: 1.0
 */
public class StaticUrl {
   
    public static String getFileUrl(){
        String   systemPath =null;
        try {
             systemPath = ResourceUtils.getURL("classpath:").getPath().replace("%20", " ").replace('/', '\').substring(1);//从路径字符串中取出工程路径
            systemPath=systemPath.substring(0,systemPath.lastIndexOf("Student"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        int result=systemPath.indexOf("\");
        if(-1!=result){
            systemPath=systemPath.substring(result).replace("/","\");

        }

        return systemPath+"file\";
       // return "E:\IDEA\file\";
    }
}