fastDFS上传步骤及案例

什么是fastDFS

fastDFS是C语言编写的一款开源的分布式文件存储系统，我们可以使用fastDFS搭建一套高性能的文件服务器集群以满足文件上传和下载的需求

文件上传基本jar包

基本jar
commons-io.jar
commons-uploadfile.jar

文件上传的三要素

1、form表单的提交方式一定时post
2、form表单 enctype的值一定是 multipart/form-data
3、form表单中一定有一个input的type类型是 file

springmvc配置

          
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="UTF-8">property>

<property name="maxUploadSize" value="5242880">property>
bean>

使用 angularjs上传文件前台代码

controller.js

	//文件上传方法
	$scope.uploadfile=function(){
		uploadService.uploadfile().success(function(response){
			if(response.success){
				//alert(response.message)
				$scope.image.url= response.message;
			}else{
				alert(response.message);
			}
		})
	}

service.js

this.uploadfile=function(){
		var formData = new FormData();//FormData:html5中的对象，可以为我们封装文件数据
		formData.append("file", file.files[0]);
		return $http({
			url:"../upload/uploadFile",
			method:"post",
			data:formData,
			//headers:{'Content-Type':undefined},
			//浏览器会帮我们把Content-Type设置为multipart/form-data;
			headers:{'Content-Type':undefined},
			//序列化文件对象
			transformRequest:angular.identity
		})
	}

前台功能入口

		<input type="file" id="file" />				                
               <button ng-click="uploadfile()" class="btn btn-primary" type="button" >
                 		上传
               button>	
...

后台代码

fastDFS工具类

package utils;

import org.csource.common.NameValuePair;
import org.csource.fastdfs.ClientGlobal;
import org.csource.fastdfs.StorageClient1;
import org.csource.fastdfs.StorageServer;
import org.csource.fastdfs.TrackerClient;
import org.csource.fastdfs.TrackerServer;

public class FastDFSClient {

	private TrackerClient trackerClient = null;
	private TrackerServer trackerServer = null;
	private StorageServer storageServer = null;
	private StorageClient1 storageClient = null;
	
	public FastDFSClient(String conf) throws Exception {
		if (conf.contains("classpath:")) {
			conf = conf.replace("classpath:", this.getClass().getResource("/").getPath());
		}
		ClientGlobal.init(conf);
		trackerClient = new TrackerClient();
		trackerServer = trackerClient.getConnection();
		storageServer = null;
		storageClient = new StorageClient1(trackerServer, storageServer);
	}
	
	/**
	 * 上传文件方法
	 * 
Title: uploadFile
	 * 
Description: 
	 * @param fileName 文件全路径
	 * @param extName 文件扩展名，不包含（.）
	 * @param metas 文件扩展信息
	 * @return
	 * @throws Exception
	 */
	public String uploadFile(String fileName, String extName, NameValuePair[] metas) throws Exception {
		String result = storageClient.upload_file1(fileName, extName, metas);
		return result;
	}
	
	public String uploadFile(String fileName) throws Exception {
		return uploadFile(fileName, null, null);
	}
	
	public String uploadFile(String fileName, String extName) throws Exception {
		return uploadFile(fileName, extName, null);
	}
	
	/**
	 * 上传文件方法
	 * 
Title: uploadFile
	 * 
Description: 
	 * @param fileContent 文件的内容，字节数组
	 * @param extName 文件扩展名
	 * @param metas 文件扩展信息
	 * @return
	 * @throws Exception
	 */
	public String uploadFile(byte[] fileContent, String extName, NameValuePair[] metas) throws Exception {
		
		String result = storageClient.upload_file1(fileContent, extName, metas);
		return result;
	}
	
	public String uploadFile(byte[] fileContent) throws Exception {
		return uploadFile(fileContent, null, null);
	}
	
	public String uploadFile(byte[] fileContent, String extName) throws Exception {
		return uploadFile(fileContent, extName, null);
	}
}

controller层

package com.pinyougou.shop.controller;

import java.io.IOException;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import com.pinyougou.entity.Result;

import utils.FastDFSClient;

@RestController
@RequestMapping("/upload")
public class UpLoadController {
	
	//动态的从application.properties配置文件中获取属性
	@Value("${file_server_url}")
	private String file_server_url;

	@RequestMapping("/uploadFile")
	public Result uploadFile(MultipartFile file) {
		
		try {
			FastDFSClient fastDFSClient = new FastDFSClient("classpath:config/fdfs_client.conf");
			//获取文件真实姓名
			String originalFilename = file.getOriginalFilename();
			//获取文件扩展名
			String extName = originalFilename.substring(originalFilename.lastIndexOf(".")+1);
			//上传文件
			String uploadFile = fastDFSClient.uploadFile(file.getBytes(), extName);
			return new Result(true, file_server_url+uploadFile);
		} catch (Exception e){
			e.printStackTrace();
			return new Result(false, "上传失败");
		}
		
		
	}
}