构建项目
访问start.spring.io/
添加Web、JSP、Servlet依赖
1.配置pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
</dependencies>
- 配置application.properties
spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp
- 创建视图目录及视图文件
/main/webapp/WEB-INF/views/index.jsp
<%@ page contentType="text/html; charset=UTF-8" language="java"%>
<html>
<head>
<title>file upload</title>
</head>
<body>
单文件上传
<br>
<form action="/upload" method="post" enctype="multipart/form-data">
<input type="file" name="file" />
<input type="submit" value="上传">
</form>
</body>
</html>
创建控制器
package com.gala.fileUploadDemo.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.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
@Controller
public class UploadController {
/**
* 跳转到上传页面
*/
@RequestMapping(value = "/index", method = RequestMethod.GET)
public String index() {
return "index";
}
/**
* 文件上传
*/
@RequestMapping(value = "/upload", method = RequestMethod.POST)
@ResponseBody
public String upload(MultipartFile file) {
return "上传成功";
}
}
单文件上传
- 修改UploadController.java的upload方法
/**
* 文件上传
*/
@RequestMapping(value = "/upload", method = RequestMethod.POST)
@ResponseBody
public String upload(HttpServletRequest request, MultipartFile file) {
try {
// 上传目录地址
String uploadDir = request.getSession().getServletContext().getRealPath("/") + "upload/";
// 如果目录不存在，自动创建
File dir = new File(uploadDir);
if (!dir.exists()) {
dir.mkdir();
}
// 上传文件名
String fileName = file.getOriginalFilename();
// 服务器端保存的文件对象
File serverFile = new File(uploadDir + fileName);
file.transferTo(serverFile);
} catch (Exception e) {
e.printStackTrace();
return "上传失败";
}
return "上传成功";
}
启动项目，访问地址：http://127.0.0.1:8080/index
多文件上传
- 修改上传界面index.jsp
<%@ page contentType="text/html; charset=UTF-8" language="java"%>
<html>
<head>
<title>file upload</title>
</head>
<body>
单文件上传
<br>
<form action="/upload" method="post" enctype="multipart/form-data">
<input type="file" name="file" />
<input type="submit" value="单文件上传" />
</form>
<br><br>
多文件上传
<form action="/uploads" method="post" enctype="multipart/form-data">
文件1：<input type="file" name="file" /><br>
文件2：<input type="file" name="file" /><br>
文件3：<input type="file" name="file" /><br>
<input type="submit" value="多文件上传" />
</form>
</body>
</html>
- 添加多文件上传方法
修改UploadController.java，添加/uploads方法
/**
* 多文件上传
*/
@RequestMapping(value = "/uploads", method = RequestMethod.POST)
@ResponseBody
public String uploads(HttpServletRequest request, @RequestParam("file") MultipartFile[] files) {
try {
// 上传目录地址
String uploadDir = request.getSession().getServletContext().getRealPath("/") + "upload2/";
System.out.println("uploads - uploadDir=" + uploadDir);
// 如果目录不存在，自动创建
File dir = new File(uploadDir);
if (!dir.exists()) {
dir.mkdir();
}
// 遍历文件数组执行上传
for (int i = 0; i < files.length; i++) {
System.out.println("files[i]=" + files[i]);
if (files[i] != null && files[i].getSize() > 0) {
excuteUpload(uploadDir, files[i]);
}
}
} catch (Exception e) {
e.printStackTrace();
return "上传失败";
}
return "上传成功";
}
private void excuteUpload(String uploadDir, MultipartFile file) {
// 文件后缀
String suffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
// 上传文件名
String fileName = UUID.randomUUID() + suffix;
// 服务器端保存的文件对象
File serverFile = new File(uploadDir + fileName);
try {
file.transferTo(serverFile);
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
启动项目，访问地址：http://127.0.0.1:8080/index
修改上传限制
SpringBoot上传文件时限制了我们上传文件最大容量为：1048576 bytes
修改application.properties配置文件
spring.servlet.multipart.max-file-size=30Mb
spring.servlet.multipart.max-request-size=30Mb
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