SpringBoot实现一个文件上传服务_spring boot 上传apk到本地返回url-CSDN博客

本文链接：https://blog.csdn.net/qq_26192391/article/details/112057935

文章目录

更新记录

2021/1/1 1:00 am 单文件上传实现
2020/1/1 16:30 pm 多文件上传实现，前端跨与请求配置

需求

文件上传，返回一个url,使用url可以直接访问该资源
上传文件存放在本机非SprngBoot项目静态资源位置
多文件上传
解决跨与请求

实现

配置application.yaml
定义一个存放上传文件的位置

web:
  upload-path: /xxx/uploadFile/

单文件

controller

@RestController
public class FileUploadController {

    @Value("${web.upload-path}")
    String fileDir;

    @PostMapping("upload")
    public Map upload(MultipartFile file, HttpServletRequest request){
        String realPath = fileDir;

        File folder= new File(realPath);

        if (!folder.exists()){
            folder.mkdirs();
        }

        String oldName=file.getOriginalFilename();
        String newName= UUID.randomUUID().toString()+oldName.substring(oldName.lastIndexOf("."));

        Map<String,Object> result=new HashMap<>();

        try {
            file.transferTo(new File(folder,newName));
            String url=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+"/file/"+newName;
            result.put("status","ok");
            result.put("url",url);

        } catch (IOException e) {
            result.put("status","failed");
            result.put("msg",e.getMessage());
        }


        return result;
    }
}

上面的controller会返回给用户一个类似于http://localhost:8080/file/xxx.jpg
还需要配置资源请求映射才能正常访问到该服务

配置静态资源映射


@Configuration
public class MyWebMvcConfig extends WebMvcConfigurationSupport {

    @Value("${web.upload-path}")
    private String uploadFilePath;



    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/file/**").addResourceLocations("file:"+uploadFilePath);
        //这句不要忘了，否则项目默认静态资源映射会失效
        registry.addResourceHandler("/**").addResourceLocations("classpath:/static/");
        super.addResourceHandlers(registry);
    }
}

多文件

@PostMapping("uploadMul")
public Map upload(MultipartFile[] files, HttpServletRequest request){
    Map<String,Object> result=new HashMap<>();
    int count=0;
    List<Map<String,Object>> list=new ArrayList<>();

    if (files==null|| files.length==0){
        result.put("","failed");
        result.put("msg","no file");
        return result;
    }

    for (MultipartFile file : files) {
        Map<String,Object>  map=new HashMap<>();
        Map res = upload(file, request);
        map.put("name",file.getOriginalFilename());
        Object url = res.get("url");
        if (url!=null){
            count++;
            map.put("url",url);
            map.put("status","ok");
        }else {
            map.put("status","failed");
            map.put("msg",res.get("msg"));
        }
        list.add(map);
    }

    result.put("upload",files.length);
    result.put("succeed",count);
    result.put("detail",list);


    return result;
}

跨域请求

跨域请求在后端配置即可
可以全局放行，也可以只针对某些地址允许

全局允许跨域请求

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

@Configuration
public class GlobalCorsConfig {
    @Bean
    public CorsFilter corsFilter(){
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.setAllowCredentials(false);
        corsConfiguration.addAllowedMethod("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addExposedHeader("*");
        UrlBasedCorsConfigurationSource configurationSource = new UrlBasedCorsConfigurationSource();
        configurationSource.registerCorsConfiguration("/**",corsConfiguration);
        return new CorsFilter(configurationSource);
    }

}