SpringBoot图片上传和访问路径映射

2019-11-26 08:41:12

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简介

做移动端对接，框架用的SpringBoot，接口RESTful，实现一个图片上传功能，图片上传是个经典的应用场景了，完成后，做个笔记记录一下，希望能帮到攻城狮们

开发步骤

1、先贴图片上传工具类

package com.prereadweb.utils; import java.io.File;import java.io.FileOutputStream;import java.util.UUID; /** * @Description: 文件工具类 * @author: Yangxf * @date: 2019/4/17 16:06 */public class FileTool {   /**   * @Function: 图片上传   * @author:  YangXueFeng   * @Date:   2019/4/18 14:13   */  public static void uploadFiles(byte[] file, String filePath, String fileName) throws Exception {    File targetFile = new File(filePath);    if (!targetFile.exists()) {      targetFile.mkdirs();    }    FileOutputStream out = new FileOutputStream(filePath + fileName);    out.write(file);    out.flush();    out.close();  }   /**   * @Function: 创建新的文件名   * @author:  YangXueFeng   * @Date:   2019/4/17 17:57   */  public static String renameToUUID(String fileName) {    return UUID.randomUUID() + "." + fileName.substring(fileName.lastIndexOf(".") + 1);  }}

2、contoller层

/**   * @Function: 用户图片上传   * @author:  Yangxf   * @Date:   2019/4/17 15:42   */  @PostMapping("/postfile")  public Object fileUpload(@RequestParam(value = "userImg", required = false) MultipartFile file, @RequestParam(value = "userId", required = false) Long userId) {    return personalService.fileUpload(file, userId);  }

此处提一下@RequestParam注解

value：前台所传参数的名称

required：它有两个参数，true/false，默认是true，如果设置的是true的，客户端如果传值为空的话，访问此接口会报500异常，如果是false的话，客户端传值为空，会默认给参数赋值null

3、service层

/**   * @Function: 用户头像上传   * @author:  YangXf   * @Date:   2019/4/17 15:41   * @param:  file 图片   * @param:  userId 用户ID   * @return: map   */  @Override  public Map<String, Object> fileUpload(MultipartFile file, Long userId) {    Map<String, Object> map = new HashMap<>();    if (Util.isEmpty(file)) {      System.out.println("文件为空空");      map.put("code", UserStatusEnum.EMPTY.intKey());      map.put("msg", UserStatusEnum.EMPTY.value());      return map;    }    UserEntity user = userMapper.fetchUser(userId);    if(Util.isEmpty(user)){      map.put("code", UserStatusEnum.USER_NOT_EXISTENCE.intKey());      map.put("msg", UserStatusEnum.USER_NOT_EXISTENCE.value());      return map;    }     String fileName = file.getOriginalFilename();    fileName = FileTool.renameToUUID(fileName);    try {      FileTool.uploadFiles(file.getBytes(), uploadConfig.getUploadPath(), fileName);    } catch (Exception e) {    }    if (Util.isEmpty(fileName)) {      map.put("code", UserStatusEnum.USER_NOT_EXISTENCE.intKey());      map.put("msg", UserStatusEnum.USER_NOT_EXISTENCE.value());      return map;    }     Map<String, Object> returnMap = new HashMap<>();    String url = "/static/" + fileName;    updateUrl(userId, url);    returnMap.put("imageUrl", url);    map.put("code", UserStatusEnum.SUCCESS.intKey());    map.put("msg", UserStatusEnum.SUCCESS.value());    map.put("data", returnMap);    return map;  }

4、设置图片访问路径映射

preread:    #文件上传目录（注意Linux和Windows上的目录结构不同）    uploadPath: E:/image/

5、配置文件上传路径

package com.prereadweb.config.upload; import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.stereotype.Component; /** * @Description: 文件上传路径配置 * @author: Yangxf * @date: 2019/4/17 17:50 */@Component@ConfigurationProperties(prefix="preread")public class PreReadUploadConfig {   //上传路径  private String uploadPath;   public String getUploadPath() {    return uploadPath;  }   public void setUploadPath(String uploadPath) {    this.uploadPath = uploadPath;  }}

6、配置映射路径

package com.prereadweb.config.upload; import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; /** * @Description: 自定义资源映射 * <p> *   设置虚拟路径，访问绝对路径下资源 * </p> * @author: Yangxf * @date: 2019/4/17 18:17 */@ComponentScan@Configurationpublic class WebConfigurer extends WebMvcConfigurerAdapter {   @Autowired  PreReadUploadConfig uploadConfig;  @Override  public void addResourceHandlers(ResourceHandlerRegistry registry) {    registry.addResourceHandler("/static/**").addResourceLocations("file:///"+uploadConfig.getUploadPath());  }}

7、此处需要导入一个jar报

<!-- 配置 --> <dependency>  <groupId> org.springframework.boot </groupId>  <artifactId> spring-boot-configuration-processor </artifactId>  <optional> true </optional></dependency>

8、postman测试接口