目标
- 确认依赖
- 配置文件上传的文件大小限制
- 单文件上传示例程序编写
- 多文件上传示例程序编写
文件上传准备
src/main/webapp下建upload文件夹
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确认存在以下依赖
<!-- Spring Boot web启动器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- jsp -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<!--<scope>provided</scope>-->
</dependency>
配置部分
配置文件上传的文件大小限制
application.properties配置文件添加：
# 上传文件总的最大值
spring.servlet.multipart.max-request-size=10MB
# 单个文件的最大值
spring.servlet.multipart.max-file-size=10MB
#配置文件上传目录权限
spring.mvc.static-path-pattern=/upload/**
spring.resources.static-locations=/upload/
## jsp （该配置应该已经存在）
spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
spring.servlet.multipart.max-request-size限制上传的多个文件的总大小
spring.servlet.multipart.max-file-size限制单个文件的最大值
单文件上传示例
1、创建Controller控制类，内容如下：
package com.neuedu.demo.controller;
import java.io.File;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
@Controller
public class UploadController {
private static final Logger LOGGER = LoggerFactory.getLogger(UploadController.class);
@GetMapping("/upload")
public String upload() {
return "upload";
}
@PostMapping("/upload")
@ResponseBody
public String upload(@RequestParam("file") MultipartFile file,HttpServletRequest request) {
if (file.isEmpty()) {
return "上传失败，请选择文件";
}
//fileName可以用自己的生成方案，我这里只简单用的原始文件名称
String fileName = file.getOriginalFilename();
String filePath = request.getRealPath("/upload");
File dest=new File(filePath,fileName);
try {
file.transferTo(dest);
LOGGER.info("上传成功");
return "上传成功";
} catch (IOException e) {
LOGGER.error(e.toString(), e);
}
return "上传失败！";
}
}
upload.jsp文件
<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<title>单文件上传</title>
</head>
<body>
<form method="post" action="<%=request.getContextPath() %>/upload" enctype="multipart/form-data">
<input type="file" name="file"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
测试
进入文件上传页面并选择需要上传的文件
http://localhost:8000/haha/upload
image.png
image.png
多文件上传
创建多文件上传的jsp页面，多文件上传页面比单文件上传多了file选择的input，
multiUpload.jsp内容如下：
<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<title>多文件上传</title>
</head>
<body>
<form method="post" action="<%=request.getContextPath() %>/multiUpload" enctype="multipart/form-data">
<input type="file" name="file"><br>
<input type="file" name="file"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
在UploadController里添加多文件上传的方法
@GetMapping("/multiUpload")
public String multiUpload() {
return "multiUpload";
}
@PostMapping("/multiUpload")
@ResponseBody
public String multiUpload(HttpServletRequest request) {
List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
String filePath = request.getRealPath("/upload");
for (int i = 0; i < files.size(); i++) {
MultipartFile file = files.get(i);
if (file.isEmpty()) {
return "上传第" + (i++) + "个文件失败";
}
String fileName = file.getOriginalFilename();
File dest=new File(filePath,fileName);
try {
file.transferTo(dest);
LOGGER.info("第" + (i + 1) + "个文件上传成功");
} catch (IOException e) {
LOGGER.error(e.toString(), e);
return "上传第" + (i++) + "个文件失败";
}
}
return "上传成功";
}
测试
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image.png
