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）

package com.zlj.web;
import com.zlj.biz.StuBiz;
import com.zlj.model.Stu;
import com.zlj.util.PageBean;
import com.zlj.util.PropertiesUtil;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.List;
/**
 * @author zlj
 * @create 2023-09-08 16:55
 */
@Controller
@RequestMapping("stu")
public class StuController {
    @Autowired
    private StuBiz stuBiz;
    //    增
    @RequestMapping("/add")
    public String add(Stu stu,HttpServletRequest request) {
        int i = stuBiz.insert(stu);
        return "redirect:list";
    }
    //            删
    @RequestMapping("/del/{sid}")
    public String del(@PathVariable("sid") Integer sid) {
        stuBiz.deleteByPrimaryKey(sid);
        return "redirect:/stu/list";
    }
//        改
@RequestMapping("/edit")
public String edit(Stu stu) {
    stuBiz.updateByPrimaryKeySelective(stu);
    return "redirect:list";
}
//文件上传
    @RequestMapping("/upload")
    public String upload(Stu stu,MultipartFile xxx){
        try {
//    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）
//    上传的图片真实的地址
        String dir= PropertiesUtil.getValue("dir");
//        网络访问的地址
        String server=PropertiesUtil.getValue("server");;
        //文件名
        String filename=xxx.getOriginalFilename();
        System.out.println("文件名"+filename);
        System.out.println("文件类别"+xxx.getContentType());
        FileUtils.copyInputStreamToFile(xxx.getInputStream(),new File(dir+filename));
//      /upload/0703.png
        stu.setSpic(server+filename);
        stuBiz.updateByPrimaryKeySelective(stu);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return "redirect:list";
}
//                查
    @RequestMapping("/list")
    public String list(Stu stu, HttpServletRequest request) {
        //stu是用来接收前台传递后台的参数
        PageBean pageBean = new PageBean();
        pageBean.setRequest(request);
        List<Stu> stus = stuBiz.ListPager(stu, pageBean);
        request.setAttribute("lst", stus);
        request.setAttribute("pageBean", pageBean);
//      WEB-INF/jsp/stu/list.jsp
        return "stu/list";
    }
    @RequestMapping(value="/download")
    public ResponseEntity<byte[]> download(Stu stu,HttpServletRequest req){
        try {
            //先根据文件id查询对应图片信息
            Stu stus = this.stuBiz.selectByPrimaryKey(stu.getSid());
            String diskPath = PropertiesUtil.getValue("dir");
            String reqPath = PropertiesUtil.getValue("server");
//            /upload/0703.png  -->D:/temp/upload/0703.png
            String realPath = stus.getSpic().replace(reqPath,diskPath);
            String fileName = realPath.substring(realPath.lastIndexOf("/")+1);
            //下载关键代码
            File file=new File(realPath);
            HttpHeaders headers = new HttpHeaders();//http头信息
            String downloadFileName = new String(fileName.getBytes("UTF-8"),"iso-8859-1");//设置编码
            headers.setContentDispositionFormData("attachment", downloadFileName);
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            //MediaType:互联网媒介类型  contentType：具体请求中的媒体类型信息
            return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }
    //数据回显
    @RequestMapping("/preSave")
    public String preSave(Stu stu, Model model) {
        if (stu != null && stu.getSid() != null && stu.getSid() != 0) {
            Stu s = stuBiz.selectByPrimaryKey(stu.getSid());
            model.addAttribute("s", s);
        }
        return "stu/edit";
    }
}

//list.jsp
<%@ page language="java" pageEncoding="UTF-8"%>
<%@include file="/common/header.jsp"%>
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>学生信息</title>
</head>
<body>
<form class="form-inline"
      action="${ctx}/stu/list" method="post">
    <div class="form-group mb-2">
        <input type="text" class="form-control-plaintext" name="same"
               placeholder="请输入学生姓名">
        <!--      <input name="rows" value="20" type="hidden"> -->
        <!-- 不想分页 -->
        <%--        <input name="pagination" value="false" type="hidden">--%>
    </div>
    <button type="submit" class="btn btn-primary mb-2">查询</button>
    <a class="btn btn-primary mb-2" href="${ctx}/stu/preSave">新增</a>
</form>
<table class="table table-striped">
    <thead>
    <tr>
        <th scope="col">学生id</th>
        <th scope="col">学生姓名</th>
        <th scope="col">学生年龄</th>
        <th scope="col">学生图片</th>
        <th scope="col">操作</th>
    </tr>
    </thead>
    <tbody>
    <c:forEach  var="s" items="${lst }">
        <tr>
            <td>${s.sid }</td>
            <td>${s.same }</td>
            <td>${s.sage }</td>
            <td>
                <img src="${s.spic}" style="height:100px;width:60px;">
            </td>
            <td>
                <a href="${ctx}/stu/preSave?sid=${s.sid}">修改</a>
                <a href="${ctx}/stu/del/${s.sid}">删除</a>
                <a href="${ctx}/page/stu/upload?sid=${s.sid}">图片上传</a>
                <a href="${ctx}/stu/download?sid=${s.sid}">图片下载</a>
            </td>
        </tr>
    </c:forEach>
    </tbody>
</table>
<!-- 这一行代码就相当于前面分页需求前端的几十行了 -->
<z:page pageBean="${pageBean }"></z:page>
</body>
</html>

//upload.jsp
<%@ page contentType="text/html; charset=UTF-8" language="java" %>
<%@include file="/common/header.jsp"%>
<html>
<head>
    <title>学生log上传</title>
</head>
<body>
<form action="${ctx}/stu/upload" method="post" enctype="multipart/form-data">
    <label>学生编号：</label><input type="text" name="sid" readonly="readonly" value="${param.sid}"/><br/>
    <label>班级图片：</label><input type="file" name="xxx"/><br/>
    <input type="submit" value="上传图片"/>
</form>
</body>
</html>

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

<%@ page contentType="text/html; charset=UTF-8" language="java" %>
<%@include file="/common/header.jsp"%>
<html>
<head>
    <title>学生log上传</title>
</head>
<body>
<form action="${ctx}/stu/upload" method="post" enctype="multipart/form-data">
    <label>学生编号：</label><input type="text" name="sid" readonly="readonly" value="${param.sid}"/><br/>
    <label>班级图片：</label><input type="file" name="xxx"/><br/>
    <input type="submit" value="上传图片"/>
</form>
<form method="post" action="${ctx}/stu/uploads" enctype="multipart/form-data">
    <input type="file" name="files" multiple>
    <button type="submit">上传</button>
</form>
</body>
</html>

package com.zlj.web;
import com.zlj.biz.StuBiz;
import com.zlj.model.Stu;
import com.zlj.util.PageBean;
import com.zlj.util.PropertiesUtil;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.List;
/**
 * @author zlj
 * @create 2023-09-08 16:55
 */
@Controller
@RequestMapping("stu")
public class StuController {
    @Autowired
    private StuBiz stuBiz;
    //    增
    @RequestMapping("/add")
    public String add(Stu stu,HttpServletRequest request) {
        int i = stuBiz.insert(stu);
        return "redirect:list";
    }
    //            删
    @RequestMapping("/del/{sid}")
    public String del(@PathVariable("sid") Integer sid) {
        stuBiz.deleteByPrimaryKey(sid);
        return "redirect:/stu/list";
    }
//        改
@RequestMapping("/edit")
public String edit(Stu stu) {
    stuBiz.updateByPrimaryKeySelective(stu);
    return "redirect:list";
}
//文件上传
    @RequestMapping("/upload")
    public String upload(Stu stu,MultipartFile xxx){
        try {
//    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）
//    上传的图片真实的地址
        String dir= PropertiesUtil.getValue("dir");
//        网络访问的地址
        String server=PropertiesUtil.getValue("server");;
        //文件名
        String filename=xxx.getOriginalFilename();
        System.out.println("文件名"+filename);
        System.out.println("文件类别"+xxx.getContentType());
        FileUtils.copyInputStreamToFile(xxx.getInputStream(),new File(dir+filename));
//      /upload/0703.png
        stu.setSpic(server+filename);
        stuBiz.updateByPrimaryKeySelective(stu);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return "redirect:list";
}
//                查
    @RequestMapping("/list")
    public String list(Stu stu, HttpServletRequest request) {
        //stu是用来接收前台传递后台的参数
        PageBean pageBean = new PageBean();
        pageBean.setRequest(request);
        List<Stu> stus = stuBiz.ListPager(stu, pageBean);
        request.setAttribute("lst", stus);
        request.setAttribute("pageBean", pageBean);
//      WEB-INF/jsp/stu/list.jsp
        return "stu/list";
    }
//下载文件
    @RequestMapping(value="/download")
    public ResponseEntity<byte[]> download(Stu stu,HttpServletRequest req){
        try {
            //先根据文件id查询对应图片信息
            Stu stus = this.stuBiz.selectByPrimaryKey(stu.getSid());
            String diskPath = PropertiesUtil.getValue("dir");
            String reqPath = PropertiesUtil.getValue("server");
//            /upload/0703.png  -->D:/temp/upload/0703.png
            String realPath = stus.getSpic().replace(reqPath,diskPath);
            String fileName = realPath.substring(realPath.lastIndexOf("/")+1);
            //下载关键代码
            File file=new File(realPath);
            HttpHeaders headers = new HttpHeaders();//http头信息
            String downloadFileName = new String(fileName.getBytes("UTF-8"),"iso-8859-1");//设置编码
            headers.setContentDispositionFormData("attachment", downloadFileName);
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            //MediaType:互联网媒介类型  contentType：具体请求中的媒体类型信息
            return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }
    //多文件上传
    @RequestMapping("/uploads")
    public String uploads(HttpServletRequest req, Stu stu, MultipartFile[] files){
        try {
            StringBuffer sb = new StringBuffer();
            for (MultipartFile file : files) {
                //思路：
                //1) 将上传图片保存到服务器中的指定位置
                String dir = PropertiesUtil.getValue("dir");
                String server = PropertiesUtil.getValue("server");
                String filename = file.getOriginalFilename();
                FileUtils.copyInputStreamToFile(file.getInputStream(),new File(dir+filename));
                sb.append(filename).append(",");
            }
            System.out.println(sb.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "redirect:list";
    }
    //数据回显
    @RequestMapping("/preSave")
    public String preSave(Stu stu, Model model) {
        if (stu != null && stu.getSid() != null && stu.getSid() != 0) {
            Stu s = stuBiz.selectByPrimaryKey(stu.getSid());
            model.addAttribute("s", s);
        }
        return "stu/edit";
    }
}

Spring之文件上传下载，jrebel，多文件上传

1.文件上传,文件下载

2.jrebel&多文件上传

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Spring之文件上传下载，jrebel，多文件上传

1.文件上传,文件下载

2.jrebel&多文件上传

热门文章

最新文章

相关课程

相关电子书

相关实验场景