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Spring MVC 文件上传下载

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.mythsky</groupId>
    <artifactId>springmvcdemo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.0.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.0.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>

    </dependencies>

</project>

View Code

registerForm.jsp

<%--
  Created by IntelliJ IDEA.
  User: mythsky
  Date: 2017/11/21
  Time: 22:31
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>注册</title>
</head>
<body>
<h3>注册页面</h3>
<form action="register" method="post">
    <table>
        <tr>
            <td><label>登录名：</label></td>
            <td><input type="text" id="loginname" name="loginname"></td>
        </tr>
        <tr>
            <td><label>生日：</label></td>
            <td><input type="text" id="birthday" name="birthday"></td>
        </tr>
        <tr><td><input type="submit" value="登录"></td></tr>
    </table>
</form>
</body>
</html>

View Code

FileUploadController

package org.mythsky.springmvcdemo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;


@Controller
public class FileUploadController {
    @RequestMapping(value = "/upload",method = RequestMethod.POST)
    public String upload(HttpServletRequest request, @RequestParam("description") String description,
                         @RequestParam("file")MultipartFile file)throws Exception{
        System.out.println(description);
        if(!file.isEmpty()){
            String path=request.getServletContext().getRealPath("/images/");
            String filename=file.getOriginalFilename();
            File filepath=new File(path,filename);
            if(!filepath.getParentFile().exists()){
                filepath.getParentFile().mkdirs();
            }
            file.transferTo(new File(path+File.separator+filename));
            return "success";
        }else{
            return "error";
        }
    }
}

View Code

虽然在maven中添加了引用，可是我本机运行的时候还是报没有找到包的错误，所以把这两个包下载下来放到lib目录中

运行tomcat

上传后可以找到上传文件放到了images目录下

修改上传下载功能

User

package org.mythsky.springmvcdemo.model;

import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.web.multipart.MultipartFile;

import java.io.Serializable;
import java.util.Date;

public class User implements Serializable {
    private String loginname;
    private String username;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    private Date birthday;
    private MultipartFile image;

    public MultipartFile getImage() {
        return image;
    }

    public void setImage(MultipartFile image) {
        this.image = image;
    }

    public User() {
        super();
    }

    public String getLoginname() {
        return loginname;
    }

    public void setLoginname(String loginname) {
        this.loginname = loginname;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
}

View Code

reguserForm.jsp

<%--
  Created by IntelliJ IDEA.
  User: mythsky
  Date: 2017/12/5
  Time: 21:12
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>用户注册</title>
</head>
<body>
    <h2>用户注册</h2>
    <form action="/reguser" enctype="multipart/form-data" method="post">
        <table>
            <tr>
                <td>用户名：</td>
                <td><input type="text" name="username"></td>
            </tr>
            <tr>
                <td>请上传头像：</td>
                <td><input type="file" name="image"></td>
            </tr>
            <tr>
                <td><input type="submit" value="注册"></td>
            </tr>
        </table>
    </form>
</body>
</html>

View Code

userInfo.jsp

<%--
  Created by IntelliJ IDEA.
  User: mythsky
  Date: 2017/12/5
  Time: 21:15
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>文件下载</title>
</head>
<body>
    <h3>文件下载</h3>
    <a href="download?filename=${requestScope.user.image.originalFilename}">${requestScope.user.image.originalFilename}</a>
</body>
</html>

View Code

FileUploadController

@RequestMapping(value = "/reguser")
    public String register(HttpServletRequest request, @ModelAttribute User user, Model model)throws Exception{
        System.out.println(user.getUsername());
        if(!user.getImage().isEmpty()){
            String path=request.getServletContext().getRealPath("/images/");
            String filename=user.getImage().getOriginalFilename();
            File filepath=new File(path,filename);
            if(!filepath.getParentFile().exists()){
                filepath.getParentFile().mkdirs();
            }
            user.getImage().transferTo(new File(path+File.separator+filename));
            model.addAttribute("user",user);
            return "userInfo";
        }else{
            return "error";
        }
    }
    @RequestMapping(value = "/download")
    public ResponseEntity<byte[]> download(HttpServletRequest request,@RequestParam("filename")String filename,Model model)throws Exception{
        String path=request.getServletContext().getRealPath("/images/");
        File file=new File(path+File.separator+filename);
        HttpHeaders headers=new HttpHeaders();
        String downloadFileName=new String(filename.getBytes("UTF-8"),"iso-8859-1");
        headers.setContentDispositionFormData("attachment",downloadFileName);
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.CREATED);
    }

View Code

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原文地址：https://www.cnblogs.com/uptothesky/p/7979648.html