• Spring之文件上传下载，jrebel，多文件上传

    • 文件上传,文件下载
    • jrebel&多文件上传

    1.文件上传,文件下载

    文件上传

    1.spring-xml配置多功能视图解析器

    2.前端标记表单为多功能表单enctype=”mutipart/form-data“

    3.后端可以直接利用mutipartFile类，接受前端传递到后台的文件

    4.将文件转成流，然后写到服务器（某一个硬盘）

    5.做硬盘于网络地址的映射（服务器配置）

    1. package com.zlj.web;
    2.  
    3. import com.zlj.biz.StuBiz;
    4. import com.zlj.model.Stu;
    5. import com.zlj.util.PageBean;
    6. import com.zlj.util.PropertiesUtil;
    7. import org.apache.commons.io.FileUtils;
    8. import org.springframework.beans.factory.annotation.Autowired;
    9. import org.springframework.http.HttpHeaders;
    10. import org.springframework.http.HttpStatus;
    11. import org.springframework.http.MediaType;
    12. import org.springframework.http.ResponseEntity;
    13. import org.springframework.stereotype.Controller;
    14. import org.springframework.ui.Model;
    15. import org.springframework.web.bind.annotation.PathVariable;
    16. import org.springframework.web.bind.annotation.RequestMapping;
    17. import org.springframework.web.multipart.MultipartFile;
    18.  
    19. import javax.servlet.http.HttpServletRequest;
    20. import java.io.File;
    21. import java.io.IOException;
    22. import java.util.List;
    23.  
    24. /**
    25.  * @author zlj
    26.  * @create 2023-09-08 16:55
    27.  */
    28. @Controller
    29. @RequestMapping("stu")
    30. public class StuController {
    31.     @Autowired
    32.     private StuBiz stuBiz;
    33.  
    34.     //    增
    35.     @RequestMapping("/add")
    36.     public String add(Stu stu,HttpServletRequest request) {
    37.         int i = stuBiz.insert(stu);
    38.         return "redirect:list";
    39.     }
    40.  
    41.     //            删
    42.     @RequestMapping("/del/{sid}")
    43.     public String del(@PathVariable("sid") Integer sid) {
    44.         stuBiz.deleteByPrimaryKey(sid);
    45.         return "redirect:/stu/list";
    46.     }
    47.  
    48. //        改
    49. @RequestMapping("/edit")
    50. public String edit(Stu stu) {
    51.     stuBiz.updateByPrimaryKeySelective(stu);
    52.     return "redirect:list";
    53. }
    54. //文件上传
    55.     @RequestMapping("/upload")
    56.     public String upload(Stu stu,MultipartFile xxx){
    57.         try {
    58. //    3.后端可以直接利用mutipartFile类，接受前端传递到后台的文件
    59. //    4.将文件转成流，然后写到服务器（某一个硬盘）
    60. //    上传的图片真实的地址
    61.         String dir= PropertiesUtil.getValue("dir");
    62. //        网络访问的地址
    63.         String server=PropertiesUtil.getValue("server");;
    64.         //文件名
    65.         String filename=xxx.getOriginalFilename();
    66.         System.out.println("文件名"+filename);
    67.         System.out.println("文件类别"+xxx.getContentType());
    68.         FileUtils.copyInputStreamToFile(xxx.getInputStream(),new File(dir+filename));
    69. //      /upload/0703.png
    70.         stu.setSpic(server+filename);
    71.         stuBiz.updateByPrimaryKeySelective(stu);
    72.     } catch (IOException e) {
    73.         e.printStackTrace();
    74.     }
    75.     return "redirect:list";
    76. }
    77.  
    78.  
    79. //                查
    80.     @RequestMapping("/list")
    81.     public String list(Stu stu, HttpServletRequest request) {
    82.         //stu是用来接收前台传递后台的参数
    83.         PageBean pageBean = new PageBean();
    84.         pageBean.setRequest(request);
    85.         List stus = stuBiz.ListPager(stu, pageBean);
    86.         request.setAttribute("lst", stus);
    87.         request.setAttribute("pageBean", pageBean);
    88. //      WEB-INF/jsp/stu/list.jsp
    89.         return "stu/list";
    90.  
    91.     }
    92.  
    93.     @RequestMapping(value="/download")
    94.     public ResponseEntity<byte[]> download(Stu stu,HttpServletRequest req){
    95.  
    96.         try {
    97.             //先根据文件id查询对应图片信息
    98.             Stu stus = this.stuBiz.selectByPrimaryKey(stu.getSid());
    99.             String diskPath = PropertiesUtil.getValue("dir");
    100.             String reqPath = PropertiesUtil.getValue("server");
    101. //            /upload/0703.png  -->D:/temp/upload/0703.png
    102.             String realPath = stus.getSpic().replace(reqPath,diskPath);
    103.             String fileName = realPath.substring(realPath.lastIndexOf("/")+1);
    104.             //下载关键代码
    105.             File file=new File(realPath);
    106.             HttpHeaders headers = new HttpHeaders();//http头信息
    107.             String downloadFileName = new String(fileName.getBytes("UTF-8"),"iso-8859-1");//设置编码
    108.             headers.setContentDispositionFormData("attachment", downloadFileName);
    109.             headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
    110.             //MediaType:互联网媒介类型  contentType：具体请求中的媒体类型信息
    111.             return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);
    112.         }catch (Exception e){
    113.             e.printStackTrace();
    114.         }
    115.         return null;
    116.     }
    117.     //数据回显
    118.     @RequestMapping("/preSave")
    119.     public String preSave(Stu stu, Model model) {
    120.         if (stu != null && stu.getSid() != null && stu.getSid() != 0) {
    121.             Stu s = stuBiz.selectByPrimaryKey(stu.getSid());
    122.             model.addAttribute("s", s);
    123.         }
    124.         return "stu/edit";
    125.     }
    126. }
    1. //list.jsp
    2. <%@ page language="java" pageEncoding="UTF-8"%>
    3. <%@include file="/common/header.jsp"%>
    7.     "Content-Type" content="text/html; charset=UTF-8">
    8.     学生信息
    11. "form-inline"
    12.       action="${ctx}/stu/list" method="post">
    13.     
      "form-group mb-2">
    14.         "text" class="form-control-plaintext" name="same"
    15.                placeholder="请输入学生姓名">
    16.         
    17.         
    18.         <%--        "pagination" value="false" type="hidden">--%>
    19.
  • "btn btn-primary mb-2" href="${ctx}/stu/preSave">新增
  • "table table-striped">
  • var="s" items="${lst }">
    • "col">学生id"col">学生姓名"col">学生年龄"col">学生图片"col">操作
    ${s.sid }${s.same }${s.sage }
  • "${s.spic}" style="height:100px;width:60px;">
  • "${ctx}/stu/preSave?sid=${s.sid}">修改
  • "${ctx}/stu/del/${s.sid}">删除
  • "${ctx}/page/stu/upload?sid=${s.sid}">图片上传
  • "${ctx}/stu/download?sid=${s.sid}">图片下载
  • "${pageBean }">
    1. //upload.jsp
    2. <%@ page contentType="text/html; charset=UTF-8" language="java" %>
    3. <%@include file="/common/header.jsp"%>
    6.     学生log上传
    9. "${ctx}/stu/upload" method="post" enctype="multipart/form-data">
    10.     "text" name="sid" readonly="readonly" value="${param.sid}"/>
    11.     "file" name="xxx"/>
    12.     "submit" value="上传图片"/>

    2.jrebel&多文件上传

    jrebel使用

    1下载插件。
    2.下载后，打开IDEA，选择File—>Settings—>Plugins—>设置按钮—>Installed Plugin from Disk（从文件夹选择已下载的插件安装）。

    3.重启IDEA
    4.选择File—>Settings—>JRebel & XRebel—>Change license

    5.安装JRebel插件后，注册地址填写网址 + 生成的GUID，邮箱随便填写，然后即可。
    http://jrebel-license.jiweichengzhu.com/{GUID}
    https://jrebel.qekang.com/{GUID}
    GUID可以使用在线GUID在线生成在线生成，然后替换{GUID}就行。
    6.下面邮箱地址可随便输入。
    7.选择我同意
    8.提交

    多文件上传

    1. <%@ page contentType="text/html; charset=UTF-8" language="java" %>
    2. <%@include file="/common/header.jsp"%>
    5.     学生log上传
    8. "${ctx}/stu/upload" method="post" enctype="multipart/form-data">
    9.     "text" name="sid" readonly="readonly" value="${param.sid}"/>
    10.     "file" name="xxx"/>
    11.     "submit" value="上传图片"/>
    13. "post" action="${ctx}/stu/uploads" enctype="multipart/form-data">
    14.     "file" name="files" multiple>
    15.     
    1. package com.zlj.web;
    2.  
    3. import com.zlj.biz.StuBiz;
    4. import com.zlj.model.Stu;
    5. import com.zlj.util.PageBean;
    6. import com.zlj.util.PropertiesUtil;
    7. import org.apache.commons.io.FileUtils;
    8. import org.springframework.beans.factory.annotation.Autowired;
    9. import org.springframework.http.HttpHeaders;
    10. import org.springframework.http.HttpStatus;
    11. import org.springframework.http.MediaType;
    12. import org.springframework.http.ResponseEntity;
    13. import org.springframework.stereotype.Controller;
    14. import org.springframework.ui.Model;
    15. import org.springframework.web.bind.annotation.PathVariable;
    16. import org.springframework.web.bind.annotation.RequestMapping;
    17. import org.springframework.web.multipart.MultipartFile;
    18.  
    19. import javax.servlet.http.HttpServletRequest;
    20. import java.io.File;
    21. import java.io.IOException;
    22. import java.util.List;
    23.  
    24. /**
    25.  * @author zlj
    26.  * @create 2023-09-08 16:55
    27.  */
    28. @Controller
    29. @RequestMapping("stu")
    30. public class StuController {
    31.     @Autowired
    32.     private StuBiz stuBiz;
    33.  
    34.     //    增
    35.     @RequestMapping("/add")
    36.     public String add(Stu stu,HttpServletRequest request) {
    37.         int i = stuBiz.insert(stu);
    38.         return "redirect:list";
    39.     }
    40.  
    41.     //            删
    42.     @RequestMapping("/del/{sid}")
    43.     public String del(@PathVariable("sid") Integer sid) {
    44.         stuBiz.deleteByPrimaryKey(sid);
    45.         return "redirect:/stu/list";
    46.     }
    47.  
    48. //        改
    49. @RequestMapping("/edit")
    50. public String edit(Stu stu) {
    51.     stuBiz.updateByPrimaryKeySelective(stu);
    52.     return "redirect:list";
    53. }
    54. //文件上传
    55.     @RequestMapping("/upload")
    56.     public String upload(Stu stu,MultipartFile xxx){
    57.         try {
    58. //    3.后端可以直接利用mutipartFile类，接受前端传递到后台的文件
    59. //    4.将文件转成流，然后写到服务器（某一个硬盘）
    60. //    上传的图片真实的地址
    61.         String dir= PropertiesUtil.getValue("dir");
    62. //        网络访问的地址
    63.         String server=PropertiesUtil.getValue("server");;
    64.         //文件名
    65.         String filename=xxx.getOriginalFilename();
    66.         System.out.println("文件名"+filename);
    67.         System.out.println("文件类别"+xxx.getContentType());
    68.         FileUtils.copyInputStreamToFile(xxx.getInputStream(),new File(dir+filename));
    69. //      /upload/0703.png
    70.         stu.setSpic(server+filename);
    71.         stuBiz.updateByPrimaryKeySelective(stu);
    72.     } catch (IOException e) {
    73.         e.printStackTrace();
    74.     }
    75.     return "redirect:list";
    76. }
    77.  
    78.  
    79. //                查
    80.     @RequestMapping("/list")
    81.     public String list(Stu stu, HttpServletRequest request) {
    82.         //stu是用来接收前台传递后台的参数
    83.         PageBean pageBean = new PageBean();
    84.         pageBean.setRequest(request);
    85.         List stus = stuBiz.ListPager(stu, pageBean);
    86.         request.setAttribute("lst", stus);
    87.         request.setAttribute("pageBean", pageBean);
    88. //      WEB-INF/jsp/stu/list.jsp
    89.         return "stu/list";
    90.  
    91.     }
    92. //下载文件
    93.     @RequestMapping(value="/download")
    94.     public ResponseEntity<byte[]> download(Stu stu,HttpServletRequest req){
    95.  
    96.         try {
    97.             //先根据文件id查询对应图片信息
    98.             Stu stus = this.stuBiz.selectByPrimaryKey(stu.getSid());
    99.             String diskPath = PropertiesUtil.getValue("dir");
    100.             String reqPath = PropertiesUtil.getValue("server");
    101. //            /upload/0703.png  -->D:/temp/upload/0703.png
    102.             String realPath = stus.getSpic().replace(reqPath,diskPath);
    103.             String fileName = realPath.substring(realPath.lastIndexOf("/")+1);
    104.             //下载关键代码
    105.             File file=new File(realPath);
    106.             HttpHeaders headers = new HttpHeaders();//http头信息
    107.             String downloadFileName = new String(fileName.getBytes("UTF-8"),"iso-8859-1");//设置编码
    108.             headers.setContentDispositionFormData("attachment", downloadFileName);
    109.             headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
    110.             //MediaType:互联网媒介类型  contentType：具体请求中的媒体类型信息
    111.             return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);
    112.         }catch (Exception e){
    113.             e.printStackTrace();
    114.         }
    115.         return null;
    116.     }
    117.     //多文件上传
    118.     @RequestMapping("/uploads")
    119.     public String uploads(HttpServletRequest req, Stu stu, MultipartFile[] files){
    120.         try {
    121.             StringBuffer sb = new StringBuffer();
    122.             for (MultipartFile file : files) {
    123.                 //思路：
    124.                 //1) 将上传图片保存到服务器中的指定位置
    125.                 String dir = PropertiesUtil.getValue("dir");
    126.                 String server = PropertiesUtil.getValue("server");
    127.                 String filename = file.getOriginalFilename();
    128.                 FileUtils.copyInputStreamToFile(file.getInputStream(),new File(dir+filename));
    129.                 sb.append(filename).append(",");
    130.             }
    131.             System.out.println(sb.toString());
    132.  
    133.         } catch (Exception e) {
    134.             e.printStackTrace();
    135.         }
    136.         return "redirect:list";
    137.     }
    138.  
    139.  
    140.  
    141.     //数据回显
    142.     @RequestMapping("/preSave")
    143.     public String preSave(Stu stu, Model model) {
    144.         if (stu != null && stu.getSid() != null && stu.getSid() != 0) {
    145.             Stu s = stuBiz.selectByPrimaryKey(stu.getSid());
    146.             model.addAttribute("s", s);
    147.         }
    148.         return "stu/edit";
    149.     }
    150. }

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  • 原文地址：https://blog.csdn.net/weixin_73471776/article/details/132777241