fastDFS与java整合文件上传下载

准备

1. 下载fastdfs-client-java源码

源码地址 密码：s3sw

1. 修改pom.xml
   第一个plugins是必需要的，是maven用来编译的插件，第二个是maven打源码包的，可以不要。

<build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <encoding>UTF-8</encoding>
          <source>${jdk.version}</source>
          <target>${jdk.version}</target>
        </configuration>
      </plugin>
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-source-plugin</artifactId>
          <version>3.0.1</version>
          <executions>
              <execution>
                  <id>attach-sources</id>
                  <goals>
                      <goal>jar</goal>
                  </goals>
              </execution>
          </executions>
      </plugin>
    </plugins>
</build>

1. 将 fastdfs-client-java 打包
   直接项目右键，run as maven install
   install成功后，fastdfs-client-java就成功的被安装到本地仓库了。
   ---

   编写工具类：

• 把fdfs_client.conf文件复制一份放到自己项目的resource下面;修改里面的tracker.server,其它的都不用动：
  
• 在项目的pom.xml中添加依赖

<dependency>
    <groupId>org.csource</groupId>
    <artifactId>fastdfs-client-java</artifactId>
    <version>1.27-SNAPSHOT</version>
</dependency>

• 首先来实现文件上传，fastdfs-client-java的上传是通过传入一个byte[ ]来完成的，简单看一下源码：

public String[] upload_file(byte[] file_buff, String file_ext_name, 
           NameValuePair[] meta_list) throws IOException, MyException{
    final String group_name = null;
    return this.upload_file(group_name, file_buff, 0, file_buff.length, file_ext_name, meta_list);
}

文件属性

package com.wuwii.utils;

import java.io.Serializable;
import java.util.Arrays;

/**
 * @ClassName FastDFSFile
 * @Description FastDFS上传文件业务对象
 * @author zhangkai
 * @date 2017年7月18日
 */
public class FastDFSFile implements Serializable{

    private static final long serialVersionUID = 2637755431406080379L;
    /**
     * 文件二进制
     */
    private byte[] content;
    /**
     * 文件名称
     */
    private String name;
    /**
     * 文件长度
     */
    private Long size;
    
    public FastDFSFile(){
        
    }
    public FastDFSFile(byte[] content, String name, Long size){
        this.content = content;
        this.name = name;
        this.size = size;
    }
    
    public byte[] getContent() {
        return content;
    }
    public void setContent(byte[] content) {
        this.content = content;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Long getSize() {
        return size;
    }
    public void setSize(Long size) {
        this.size = size;
    }
    public static long getSerialversionuid() {
        return serialVersionUID;
    }
}

编写FastDFS工具类

package com.wuwii.utils;

import java.io.Serializable;

import org.apache.commons.io.FilenameUtils;
import org.csource.common.NameValuePair;
import org.csource.fastdfs.ClientGlobal;
import org.csource.fastdfs.StorageClient1;
import org.csource.fastdfs.TrackerClient;
import org.csource.fastdfs.TrackerServer;
import org.jetbrains.annotations.NotNull;
import org.springframework.core.io.ClassPathResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;

/**
 * @ClassName FastDFSUtils
 * @Description FastDFS工具类
 * @author zhangkai
 * @date 2017年7月18日
 */
public class FastDFSUtils implements Serializable{
    /**
     * 
     */
    private static final long serialVersionUID = -4462272673174266738L;
    private static TrackerClient trackerClient;
    private static TrackerServer trackerServer;
    private static StorageClient1 storageClient1;
    
    static {
        try {
            //clientGloble读配置文件
            ClassPathResource resource = new ClassPathResource("fdfs_client.conf");
            ClientGlobal.init(resource.getClassLoader().getResource("fdfs_client.conf").getPath());
            //trackerclient
            trackerClient = new TrackerClient();
            trackerServer = trackerClient.getConnection();
            //storageclient
            storageClient1 = new StorageClient1(trackerServer,null); 
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * fastDFS文件上传
     * @param file 上传的文件 FastDFSFile
     * @return String 返回文件的绝对路径
     */
    public static String uploadFile(FastDFSFile file){
        String path = null;
        try {
            //文件扩展名
            String ext = FilenameUtils.getExtension(file.getName());
            //mata list是表文件的描述
            NameValuePair[] mata_list = new NameValuePair[3];
            mata_list[0] = new NameValuePair("fileName",file.getName());
            mata_list[1] = new NameValuePair("fileExt",ext);
            mata_list[2] = new NameValuePair("fileSize",String.valueOf(file.getSize()));
            path = storageClient1.upload_file1(file.getContent(), ext, mata_list);
        } catch (Exception e) {
            e.printStackTrace();
        } 
        return path;
    }
    
    /**
     * fastDFS文件下载
     * @param groupName 组名
     * @param remoteFileName 文件名
     * @param specFileName 真实文件名
     * @return ResponseEntity<byte[]>
     */
    @org.jetbrains.annotations.NotNull
    public static ResponseEntity<byte[]> downloadFile(String groupName, String remoteFileName, String specFileName){
        byte[] content = null;
        HttpHeaders headers = new HttpHeaders();
        try {
            content = storageClient1.download_file(groupName, remoteFileName);
            headers.setContentDispositionFormData("attachment",  new String(specFileName.getBytes("UTF-8"),"iso-8859-1"));
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return new ResponseEntity<byte[]>(content, headers, HttpStatus.CREATED);
    }
    
    /**
     * 根据fastDFS返回的path得到文件的组名
     * @param path fastDFS返回的path
     * @return
     */
    public static String getGroupFormFilePath(String path){
        return path.split("/")[0];
    }
    
    /**
     * 根据fastDFS返回的path得到文件名
     * @param path fastDFS返回的path
     * @return
     */
    @NotNull
    public static String getFileNameFormFilePath(String path) {
        return path.substring(path.indexOf("/")+1);
    }
}

测试Controller

package com.wuwii.controller;

import java.io.IOException;

import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;

import com.wuwii.utils.FastDFSFile;
import com.wuwii.utils.FastDFSUtils;
import com.wuwii.utils.PropertyUtil;

/**
 * FastFDS控制器
 * @author zhangkai
 *
 */
@Controller
@RequestMapping(value = "/fastdfs")
public class FastFDSController {
     @RequestMapping(value = "/upload", method = RequestMethod.POST)
    public String upload (MultipartFile file){
        try {
            FastDFSFile fastDFSFile = new FastDFSFile(file.getBytes(), file.getOriginalFilename(), file.getSize());
            String path = FastDFSUtils.uploadFile(fastDFSFile);
            return "redirect:"+ PropertyUtil.get("fastFDS_server") + path;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }
     
     @RequestMapping(value = "/download")
     public ResponseEntity<byte[]> download (String path, String specFileName){
         String filename = FastDFSUtils.getFileNameFormFilePath(path);
         String group = FastDFSUtils.getGroupFormFilePath(path);
         return FastDFSUtils.downloadFile(group, filename, specFileName);
     }
}

最后附上读取配置文件的工具类PropertyUtil

package com.wuwii.utils;

import java.io.InputStream;
import java.util.Properties;

/**
 * @ClassName PropertyUtil
 * @Description 读取配置文件的内容（key，value）
 * @author zhangkai
 * @date 2017年7月18日
 */
public class PropertyUtil {
    public static final Properties PROP = new Properties();

    /** 
     * @Method: get 
     * @Description: 读取配置文件的内容（key，value）
     * @param key
     * @return String
     * @throws 
     */
    public static String get(String key) {
        if (PROP.isEmpty()) {
            try {
                InputStream in = PropertyUtil.class.getResourceAsStream("/config.properties");
                PROP.load(in);
                in.close();
            } catch (Exception e) {}
        }
        return PROP.getProperty(key);
    }
}

测试

上传!

下载

下载就很简单了，因为直接获得到二进制流了，返回给客户端即可。
下载需要主要的是，要注意从FastDFS返回的文件名是这种随机码，因此我们需要在上传的时候将文件本身的名字存到数据库，再到下载的时候对文件头重新设置名字即可。

来源：https://www.cnblogs.com/qnight/p/8983161.html