Spring Boot 上传文件(spring boot upload file)

本篇文章将说明在Spring Boot web程序中如何上传文件。

开发环境：

1. eclipse Oxygen Release (4.7.0)

2. Spring Boot 1.4.3 RELEASE

3. Spring 4.3.5 RELEASE

4. Thymelaef

5. Maven

6. Embedded Tomcat 8

1.最终的项目结构

2.项目所需依赖 pom.xml

<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/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.thinkingingis</groupId><artifactId>spring-boot-fileupload</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>spring-boot-fileupload</name><url>http://maven.apache.org</url><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.4.3.RELEASE</version></parent><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><optional>true</optional></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

3. UploadController.java

用MultipartFile类去匹配上传的文件

package org.thinkingingis.controller;import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;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.multipart.MultipartFile;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;@Controller
public class UploadController {private static String UPLOAD_FOLDER = "H://temp//";@GetMapping("/")public String index() {return "upload";}@PostMapping("/upload")public String singleFileUpload(@RequestParam("file") MultipartFile file,RedirectAttributes redirectAttributes) {if(file.isEmpty()) {redirectAttributes.addFlashAttribute("message", "请选择一个上传文件");}try {byte[] bytes = file.getBytes();Path path = Paths.get(UPLOAD_FOLDER + file.getOriginalFilename());Files.write(path, bytes);redirectAttributes.addFlashAttribute("message", "已经将 '" + file.getOriginalFilename() + "' 的文件上传成功");} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return "redirect:/uploadStatus";}@GetMapping("/uploadStatus")public String uploadStatus() {return "uploadStatus";}}

4. Thymeleaf 前端页面

4.1 upload.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head><body><h1>ThinkingInGIS</h1> <br/><h1>Spring Boot 文件上传示例</h1><form method="POST" action="/upload" enctype="multipart/form-data"><input type="file" name="file" /><br/><br/><input type="submit" value="上传" />
</form></body>
</html>

4.2 uploadStatus.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head><body><h1>Spring Boot - 上传状态</h1><div th:if="${message}"><h2 th:text="${message}"></h2>
</div></body>
</html>

5. 处理文件过大的情况

下面 GlobalExceptionHandler.java 这个类是处理当上传文件超过10mb限制所引发的异常情况。

package org.thinkingingis.controller;import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.multipart.MultipartException;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;@ControllerAdvice
public class GlobalExceptionHandler {public String handerError(MultipartException e, RedirectAttributes redirectAttributes) {redirectAttributes.addFlashAttribute("message", e.getCause().getMessage());return "redirect:/uploadStatus";}}

6. Tomcat大文件重置连接

对于embedded tomcat ，需要声明TomcatEmbeddedServletContainerFactory

package org.thinkingingis.controller;import org.apache.coyote.http11.AbstractHttp11Protocol;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.tomcat.TomcatConnectorCustomizer;
import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
import org.springframework.context.annotation.Bean;@SpringBootApplication
public class SpringBootWebApplication {//private int maxUploadFileSize = 10 * 1024 * 1024;public static void main(String[] args) throws Exception {SpringApplication.run(SpringBootWebApplication.class, args);}//Tomcat large file upload connection reset@Beanpublic TomcatEmbeddedServletContainerFactory tomcatEmbedded() {TomcatEmbeddedServletContainerFactory tomcat = new TomcatEmbeddedServletContainerFactory();tomcat.addConnectorCustomizers((TomcatConnectorCustomizer) connector -> {if ((connector.getProtocolHandler() instanceof AbstractHttp11Protocol<?>)) {//-1 means unlimited((AbstractHttp11Protocol<?>) connector.getProtocolHandler()).setMaxSwallowSize(-1);}});return tomcat;}
}

7. 在application.properties中设置上传文件的上限

#http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#common-application-properties
#search multipart
spring.http.multipart.max-file-size=10MB
spring.http.multipart.max-request-size=10MB

8. 进入项目文件输入 mvn spring-boot:run

9. 启动成功后浏览器输入 localhost:8080

上传成功后

到此就实现了Spring Boot上传文件的功能。

如遇到问题，欢迎通过公众号留言给作者，以便共同探讨。

邮箱：thinkingingis@qq.com

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