fastDFS图片上传下载

java文件

js

// 上传合同fastfds
	//var fileUrl = $(‘#fileUrl‘).val();
	addUpload($(‘#path‘));
	function addUpload(fileInput){
		$(fileInput).fileupload({
           url:  ‘uploadingJson.do‘,
           dataType: ‘json‘,
           done: function (e, res) {
               var result =res.result;
               if(result.message != undefined){
            	   bootBoxDialog(result.message);
            	   return false;
               }
               var url=result.data.url;
               $(this).parent().css("background-color", "");
               $(this).parent().find("#pathValue").val(url);
			   $(this).parent().parent().find("a").remove();
			   $(this).parent().parent().find("#del").show();
			   $(this).parent().after(‘<a target="_bank" href="‘+url+‘">  附件查看</a>‘);
			   $(this).parent().after(‘<img  src="readImage.do?imagePath=‘+url+‘">‘);
           },
           progressall: function (e, data) {

           }
       });
	}

　　java文件

里面有用fastDFS方法的，和没用fastDFS方法的图片上传

js和其他一样，fastDFS只是配置了一些参数，然后引入自己的包。

package com.guilf.consumer.controller;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;

import java.io.FileInputStream;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
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.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import com.alibaba.fastjson.JSONObject;
import com.guilf.consumer.image.FastDFSClient;
//import com.guilf.project.entity.User;
//import com.guilf.project.service.UserService;

@Controller("imageController")
@RequestMapping("/")
public class ImageController
{
	//@Autowired
	//private UserService userService;

	@RequestMapping("imageInAndOut")
    public String hello(){
        return "imageInAndOut";

    }

	@RequestMapping(value = "uploadingJson", method = RequestMethod.POST)
    @ResponseBody
    public Object upload(HttpServletRequest request, HttpServletResponse response,
                         @RequestParam("file") MultipartFile uploadFile) throws Exception
    {
        String fileId;
        try
        {
            fileId = FastDFSClient.uploadFile(uploadFile.getInputStream(), uploadFile.getOriginalFilename());
        } catch (IOException e)
        {
            throw new Exception("文件上传失败");
        }

        JSONObject attachment = new JSONObject();
        attachment.put("name", uploadFile.getOriginalFilename());
        attachment.put("size", uploadFile.getSize());
        attachment.put("url", fileId);
        String userAgent = request.getHeader("User-Agent");
        //logger.info(userAgent);

        JSONObject rejson = new JSONObject();
        rejson.put("data", attachment);

        if (userAgent.contains("MSIE 9"))
        {
          //  logger.info("是IE浏览器，返回纯文本");
            response.setContentType("text/plain");
            return rejson.toJSONString();
        }

        return rejson;
    }

	//上传文件会自动绑定到MultipartFile中
    @RequestMapping(value="uploadImage",method=RequestMethod.POST)
    public String upload(HttpServletRequest request,
           @RequestParam("description") String description,
           @RequestParam("file") MultipartFile file) throws Exception {

       System.out.println(description);
       //如果文件不为空，写入上传路径
       if(!file.isEmpty()) {
           //上传文件路径
         //  String path = request.getServletContext().getRealPath("/images/");
           String path = "E:\\myEclipseGuilf\\workspace\\iamge";
           //上传文件名
           String filename = file.getOriginalFilename();
           File filepath = new File(path,filename);
           //判断路径是否存在，如果不存在就创建一个
           if (!filepath.getParentFile().exists()) {
               filepath.getParentFile().mkdirs();
           }
           //将上传文件保存到一个目标文件当中
           file.transferTo(new File(path + File.separator + filename));
           return "success";
       } else {
           return "error";
       }
    }

  //上传文件会自动绑定到MultipartFile中AJAX提交的
    @RequestMapping(value="uploadImage_ajax",method=RequestMethod.POST)
    @ResponseBody
    public Object uploadAjax(HttpServletRequest request,
           @RequestParam("file") MultipartFile file) throws Exception {
       //如果文件不为空，写入上传路径
       if(!file.isEmpty()) {
           //上传文件路径
         //  String path = request.getServletContext().getRealPath("/images/");
           String path = "E:\\myEclipseGuilf\\workspace\\iamge";
         //  String path = request.getSession().getServletContext().getRealPath("/images/");
    	 //  String path = request.getContextPath();
           //上传文件名
           String filename = file.getOriginalFilename();
           File filepath = new File(path,filename);
           //判断路径是否存在，如果不存在就创建一个
           if (!filepath.getParentFile().exists()) {
               filepath.getParentFile().mkdirs();
           }
           //将上传文件保存到一个目标文件当中
           file.transferTo(new File(path + File.separator + filename));

           JSONObject attachment = new JSONObject();
           attachment.put("name", filename);
           attachment.put("url",  path + File.separator + filename);
           JSONObject rejson = new JSONObject();
           rejson.put("data", attachment);
           return rejson;
       } else {
           return "error";
       }
    }

    //读图片到前台展示
	@RequestMapping(value = "readImage")
	public void readImage(HttpServletRequest request,HttpServletResponse response,
			@RequestParam("imagePath") String imagePath) {
		//String imagePath = request.getParameter("imagePath");// 图片绝对路径
		try {
			File file = new File(imagePath);
			if (file.exists()) {
				DataOutputStream temps = new DataOutputStream(
						response.getOutputStream());
				DataInputStream in = new DataInputStream(new FileInputStream(
						imagePath));
				byte[] b = new byte[2048];
				while ((in.read(b)) != -1) {
					temps.write(b);
					temps.flush();
				}
				in.close();
				temps.close();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

原文地址：https://www.cnblogs.com/guilf/p/9397572.html