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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。

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    <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>
  2. 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:

  • 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
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    <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:
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    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

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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

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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

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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

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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!

猫咪

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。

------本文结束 🖐 感谢阅读------
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