一、创建一个简单的包含WEB依赖的SpringBoot项目
pom.xml 内容：
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<!-- 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> |
二、配置 文件上传 的文件大小限制
application.properties 配置文件添加：
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# 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
## jsp spring.mvc.view.prefix=/WEB-INF/jsp/ spring.mvc.view.suffix=.jsp |
spring.servlet.multipart.max-file-size 限制单个文件的最大值 spring.servlet.multipart.max-request-size 限制上传的多个文件的总大小
三、单文件上传示例
1、创建Controller控制类，内容如下：
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package com.songguoliang.springboot.controller;
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; import org.springframework.web.multipart.MultipartHttpServletRequest;
import javax.servlet.http.HttpServletRequest; import java.io.File; import java.io.IOException; import java.util.List;
/** * @Description * @Author sgl * @Date 2018-05-15 14:04 */ @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) { if (file.isEmpty()) { return "上传失败，请选择文件" ; }
String fileName = file.getOriginalFilename(); String filePath = "/Users/itinypocket/workspace/temp/" ; 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！" ; }
} |
2、创建 upload.jsp 文件
只有一个表单，选择文件，form的 enctype 为 multipart/form-data :
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<%@ 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 = "/upload" enctype = "multipart/form-data" > < input type = "file" name = "file" >< br > < input type = "submit" value = "提交" > </ form > </ body > </ html > |
3、通过springboot插件启动项目，浏览器输入 http://localhost:8080/upload ：
选择文件点击提交按钮返回成功信息，我们上传的文件保存在 /Users/itinypocket/workspace/temp 路径下：
四、多文件上传
1、创建多文件上传的jsp页面，多文件上传页面只是比单文件上传多了file选择的input而已， multiUpload.jsp 内容如下：
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<%@ 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 = "/multiUpload" enctype = "multipart/form-data" > < input type = "file" name = "file" >< br > < input type = "file" name = "file" >< br > < input type = "file" name = "file" >< br > < input type = "submit" value = "提交" > </ form > </ body > </ html > |
2、在 UploadController 里添加多文件上传的方法
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@GetMapping ( "/multiUpload" ) public String multiUpload() { return "multiUpload" ; }
@PostMapping ( "/multiUpload" ) @ResponseBody public String multiUpload(HttpServletRequest request) { List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles( "file" ); String filePath = "/Users/itinypocket/workspace/temp/" ; 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" ;
} |
3、重启服务，浏览器输入 http://localhost:8080/multiUpload :
4、然后选择要上传的文件，点击提交按钮，得到成功信息：
我们选择的三个文件已被成功上传到 /Users/itinypocket/workspace/temp 路径下。
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源码：
github
码云
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原文链接：https://blog.csdn.net/gnail_oug/article/details/80324120
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