SpringBoot实现文件上传功能

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新建maven项目，pom文件：

<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.niiam</groupId>
<artifactId>SBFileUpload</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>SBFileUpload Maven Webapp</name>
<url>http://maven.apache.org</url> 
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent> <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>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
<scope>test</scope>
</dependency> 
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency> </dependencies> 
<properties>
<java.version>9</java.version>
</properties> <build>
<finalName>SBFileUpload</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build> <repositories>
<repository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</pluginRepository>
</pluginRepositories> </project>

Test.html文件：

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script> </head>
<body>
<form id="formId" action="/SBFileUpload/testUpload" target="frame1" method="POST" enctype="multipart/form-data">
<input type="file" name="file"/>
<input type="button" value="提交" onclick="upload()">
</form> <iframe name="frame1" frameborder="0" height="40"></iframe> <script type="text/javascript">
function upload() {
$("#formId").submit();
}
</script> </body>
</html>

注意：

1、第10行，action里要指明项目名，这样在跳转时才能跳转到该项目的链接中

2、为了防止点击提交按键后页面跳转，此处设置了iframe标签，用于点击按键后发送ajax指令。

后台Java代码：

Application.java

package com.niiam; import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer; @SpringBootApplication
public class Application extends SpringBootServletInitializer{ @Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Application.class);
} public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

Controller.java

package com.niiam; import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.bind.annotation.RequestMethod; import java.io.*; import javax.servlet.http.HttpServletRequest; @RestController
public class Controller {
@RequestMapping(value="/testUpload",method=RequestMethod.POST)
public void testUploadFile(HttpServletRequest req,MultipartHttpServletRequest multiReq) throws IOException{
FileOutputStream fos=new FileOutputStream(new File("E://fileuploadtest//src//file//upload.jpg"));
FileInputStream fs=(FileInputStream) multiReq.getFile("file").getInputStream();
byte[] buffer=new byte[1024];
int len=0;
while((len=fs.read(buffer))!=-1){
fos.write(buffer, 0, len);
}
fos.close();
fs.close();
}
}