1.图解实现文件上传的步骤
2.上传文件的接口MultipartFile接口
MultipartFile是一个接口(abstract interface)
public interface MultipartFile
/**
A representation of an uploaded file received in a multipart request.
其实例对象代表了一个在multipart请求中接收到的待上传文件
The file contents are either stored in memory or temporarily on disk.
而文件的内容要么存储在记忆中要么暂时存储在硬盘中
In either case, the user is responsible for copying file contents to a
在任何一种情况下,使用者都可以复制文件内容到一个
session-level or persistent store as and if desired. The temporary storages
会话级或者持久存储中
will be cleared at the end of request processing.
在请求处理结束时,临时的存储都会被清空
可以把这个类理解成一个代表型的类,
因为其实例往往用来代表要上传的文件
还有一种是做事型的类
实例化该类是为了使用该类的能做某事的方法
有些类既是代表型的又是做事型的
3.login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href="http://localhost:8080/SpringMVCDemo03_4/">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>${msg }</h1>
<form action="user/login.do">
<p>账号：<input type="text" name="account"></p>
<p>密码：<input type="password" name="password"></p>
<p><input type="submit" value="登录"></p>
</form>
</body>
</html>
4.UserController
package com.zhiyou100.controller;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import com.zhiyou100.model.User;
import com.zhiyou100.service.UserService;
import com.zhiyou100.service.impl.UserServiceImpl;
@Controller
@RequestMapping("user")
public class UserController {
private UserService userService = new UserServiceImpl();
@RequestMapping("login.do")
public String login(User user,HttpServletRequest request,Model model){
String result = userService.login(user, request.getSession());
if (result.equals("登录成功")) {
return "redirect:info.do";
}else {
model.addAttribute("msg", result);
return "forward:/login.jsp";
}
}
@RequestMapping("info.do")
public String info(){
return "success";
}
@RequestMapping("update.do")
public String update(User user,@RequestParam("icon") MultipartFile multipartFile,HttpServletRequest request){
userService.update(user, multipartFile, request.getSession());
return "redirect:info.do";
}
}
5. UserServiceImpl
package com.zhiyou100.service.impl;
import java.io.File;
import javax.servlet.http.HttpSession;
import org.springframework.web.multipart.MultipartFile;
import com.zhiyou100.dao.UserDAO;
import com.zhiyou100.dao.impl.UserDAOImpl;
import com.zhiyou100.model.User;
import com.zhiyou100.service.UserService;
public class UserServiceImpl implements UserService{
private UserDAO userDAO = new UserDAOImpl();
@Override
public String login(User user, HttpSession session) {
if (user.getAccount() == null || user.getAccount().length() == 0) {
return "账户名不能为空";
}
if (user.getPassword() == null || user.getPassword().length() == 0) {
return "密码不能为空";
}
User user2 = userDAO.findByAccount(user.getAccount());
if (user2 == null) {
return "账户不存在";
}
if (!user.getPassword().equals(user2.getPassword())) {
return "密码错误";
}
session.setAttribute("user", user2);
return "登录成功";
}
@Override
public void update(User user, MultipartFile multipartFile, HttpSession session) {
User user2 =(User) session.getAttribute("user");
user2 = userDAO.queryById(user2.getId());
if (user.getPassword() != null && user.getPassword().length() != 0) {
user2.setPassword(user.getPassword());
}
if (!multipartFile.isEmpty()) {
try {
String path = session.getServletContext().getRealPath("img/");
String fileName= "";
fileName+= System.currentTimeMillis();
fileName+= session.getId();
fileName+= multipartFile.getOriginalFilename();
multipartFile.transferTo(new File(path+fileName));
user2.setHeader(fileName);
} catch (Exception e) {
}
}
userDAO.update(user2);
session.setAttribute("user", user2);
}
}
6. JDBC
package com.zhiyou100.util;
import java.lang.AutoCloseable;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
public class JDBC {
public static Connection getConnection() throws IOException, ClassNotFoundException, SQLException{
InputStream is = JDBC.class.getClassLoader().getResourceAsStream("jdbc.properties");
Properties properties = new Properties();
properties.load(is);
String driver = properties.getProperty("driver");
String url = properties.getProperty("url");
String user = properties.getProperty("user");
String password = properties.getProperty("password");
Class.forName(driver);
Connection connection = DriverManager.getConnection(url,user,password);
return connection;
}
public static void Close(AutoCloseable ...closeables){
for (AutoCloseable closeable : closeables) {
if (closeable!=null) {
try {
closeable.close();
} catch (Exception e) {
System.out.println("关闭失败");
e.printStackTrace();
}
}
}
}
}
7. jdbc.properties
driver = com.mysql.jdbc.Driver
url = jdbc:mysql://127.0.0.1:3306/test2
user = root
password = 123456
8. success.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href="http://localhost:8080/SpringMVCDemo03_4/">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
${user}
<c:if test="${user.header ==null }">
<img alt="" src="img/1.png">
</c:if>
<c:if test="${user.header !=null }">
<img alt="" src="img/${user.header }">
</c:if>
<hr>
<p>修改个人信息</p>
<form action="user/update.do" method="post" enctype="multipart/form-data">
<!-- 在这里可以不提交id -->
<p>
修改密码：<input type="text" name="password">
</p>
<p>
修改头像：<input type="file" name="icon">
</p>
<p>
<button>修改</button>
</p>
</form>
</body>
</html>
![ChatGPT学会自己提问题了，还支持多文件上传[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)