图片上传过程

package cn.e3mall.controller;

import cn.e3mall.common.util.FastDFSClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import java.util.*;

/**
 * 图片上传Controller
 */
@Controller
public class PictureController {

    @Value("${IMAGE_SERVER_URL}")
    private String IMAGE_SERVER_URL;

    @RequestMapping("/pic/upload")
    @ResponseBody
    public Map uploadFile(MultipartFile uploadFile){
        try{
            //上传文件
            FastDFSClient fastDFSClient = new FastDFSClient("classpath:conf/client.conf");
            //获取到文件的原名称(原名称中包含文件扩展名)
            String originalFilename = uploadFile.getOriginalFilename();
            //获取文件扩展名（originalFilename.lastIndexOf(".")表示从"."开始，包含"."）
            String extName = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);
            //根据返回的String拼好完整的路径名（第一个参数是上传文件的字节数组，第二个参数是文件的扩展名）
            String string = fastDFSClient.uploadFile(uploadFile.getBytes(), extName);
            //拼接路径（http://192.168.1.142/+string）
            String url = IMAGE_SERVER_URL+string;
            //装到Map中返回
            Map map = new HashMap();
            map.put("error",0);
            map.put("url",url);
            return map;
        }catch(Exception e){
            //先打印异常信息
            e.printStackTrace();
            //出现异常说明上传失败了
            Map map = new HashMap();
            map.put("error",1);
            map.put("message","上传失败了");
            return map;
        }

    }
}