Java中实现图片的上传

这边直接存放在c盘的指定目录，在property中指定了一个目录

没有花时间写用户操作的上传页面，直接用swagger2插件，可以上传

 

默认图片大小超过1mb就不可以上传，可以如下更改

server.port=8899
spring.servlet.multipart.enabled=true
spring.servlet.multipart.max-file-size=3MB
spring.servlet.multipart.max-request-size=3MB

pic_path="C:\\pic\\"
sava_path=C:\\pic\\

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package com.example.demo.controller;   import org.springframework.beans.factory.annotation.Value; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.multipart.MultipartFile;   import javax.servlet.http.HttpServletRequest; import java.io.File;   @RestController public class UploadController {       @Value("${sava_path}")     private String sava_path;         @RequestMapping(path = "/save_photo", method = {RequestMethod.POST})     public String addDish(@RequestParam("photos") MultipartFile file, HttpServletRequest request) throws Exception {         String path = null;// 文件路径         double fileSize = file.getSize();         System.out.println("文件的大小是"+ fileSize);           byte[] sizebyte=file.getBytes();         System.out.println("文件的byte大小是"+ sizebyte.toString());               if (file != null) {// 判断上传的文件是否为空             String type = null;// 文件类型             String fileName = file.getOriginalFilename();// 文件原名称             System.out.println("上传的文件原名称:" + fileName);             // 判断文件类型             type = fileName.indexOf(".") != -1 ? fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length()) : null;             if (type != null) {// 判断文件类型是否为空                   if ("GIF".equals(type.toUpperCase()) || "PNG".equals(type.toUpperCase()) || "JPG".equals(type.toUpperCase())) {                       // 项目在容器中实际发布运行的根路径                     String realPath = request.getSession().getServletContext().getRealPath("/");                     // 自定义的文件名称                     String trueFileName = String.valueOf(System.currentTimeMillis()) + "." + type;                     // 设置存放图片文件的路径                       path = sava_path+fileName;                     System.out.println("存放图片文件的路径:" + path);                       // 转存文件到指定的路径                     file.transferTo(new File(path));                     System.out.println("文件成功上传到指定目录下");                       return "文件成功上传到指定目录下";                 }               } else {                 System.out.println("不是我们想要的文件类型,请按要求重新上传");                 return "不是我们想要的文件类型,请按要求重新上传";             }         } else {             System.out.println("文件类型为空");             return "文件类型为空";         }           return "已经成功上传到指定目录";     } }

　pom.xml

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<?xml version="1.0" encoding="UTF-8"?> <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>         <parent>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-parent</artifactId>         <version>2.1.6.RELEASE</version>         <relativePath/> <!-- lookup parent from repository -->     </parent>         <groupId>com.example</groupId>     <artifactId>demo</artifactId>     <version>0.0.1-SNAPSHOT</version>     <name>demo</name>     <description>Demo project for Spring Boot</description>         <repositories>         <repository>             <id>alimaven</id>             <name>aliyun maven</name>             <url>http://maven.aliyun.com/nexus/content/groups/public/</url>             <layout>default</layout>             <snapshots>                 <enabled>false</enabled>             </snapshots>         </repository>     </repositories>         <properties>         <java.version>1.8</java.version>     </properties>       <dependencies>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter</artifactId>         </dependency>           <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-test</artifactId>             <scope>test</scope>         </dependency>           <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-web</artifactId>         </dependency>           <!--Swagger-ui配置-->         <dependency>             <groupId>io.springfox</groupId>             <artifactId>springfox-swagger2</artifactId>             <version>2.9.2</version>         </dependency>           <dependency>             <groupId>io.springfox</groupId>             <artifactId>springfox-swagger-ui</artifactId>             <version>2.9.2</version>         </dependency>       </dependencies>       <build>         <plugins>             <plugin>                 <groupId>org.springframework.boot</groupId>                 <artifactId>spring-boot-maven-plugin</artifactId>             </plugin>         </plugins>     </build>   </project>