不同服務器上的Java項目文件同步 解決方案(socket 、http)

最近兩個項目之間的需要做數據同步，要求是A項目的數據以及圖片文件要同步到B項目，首先兩個項目都是獨立的採集錄入信息的項目，數據庫數據同步不說了，還有一些圖片等文件也得需要同步， 首先想到的是B項目調用A項目的圖片路徑，因爲兩個項目的圖片文件路徑有很多種生成情況，兩項目都在運行中，這種圖片路徑方法就排除了。 後面就想到了兩種解決方法：

1 socket 方法 就是在B項目添加偵聽 B項目啓動時候start， 在A項目中用Client 。

2 在A項目中通過HttpURLConnection模擬post表單提交到B項目對應方法。（個人感覺這種比較好）

HttpURLConnection：

package test.httpUp;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

public class HttpPostUtil {
	

	URL url;
	HttpURLConnection conn;
	String boundary = "--------http";
	Map<String, String> textParams = new HashMap<String, String>();
	Map<String, File> fileparams = new HashMap<String, File>();
	DataOutputStream ds;

	public HttpPostUtil(String url) throws Exception {
		this.url = new URL(url);
	}
    //重新設置要請求的服務器地址，即上傳文件的地址。
	public void setUrl(String url) throws Exception {
		this.url = new URL(url);
	}
    //增加一個普通字符串數據到form表單數據中
	public void addTextParameter(String name, String value) {
		textParams.put(name, value);
	}
    //增加一個文件到form表單數據中
	public void addFileParameter(String name, File value) {
		fileparams.put(name, value);
	}
    // 清空所有已添加的form表單數據
	public void clearAllParameters() {
		textParams.clear();
		fileparams.clear();
	}
    // 發送數據到服務器，返回一個字節包含服務器的返回結果的數組
	public byte[] send() throws Exception {
		initConnection();
		try {
			conn.connect();
		} catch (SocketTimeoutException e) {
			// something
			throw new RuntimeException();
		}
		ds = new DataOutputStream(conn.getOutputStream());
		writeFileParams();
		writeStringParams();
		paramsEnd();
		InputStream in = conn.getInputStream();
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		int b;
		while ((b = in.read()) != -1) {
			out.write(b);
		}
		conn.disconnect();
		return out.toByteArray();
	}
    //文件上傳的connection的一些必須設置
	private void initConnection() throws Exception {
		conn = (HttpURLConnection) this.url.openConnection();
		
		conn.setDoOutput(true);
		conn.setUseCaches(false);
		conn.setConnectTimeout(10000); //連接超時爲10秒
		conn.setRequestMethod("POST");
		conn.setRequestProperty("Content-Type",
				"multipart/form-data; boundary=" + boundary);
	}
    //普通字符串數據
	private void writeStringParams() throws Exception {
		Set<String> keySet = textParams.keySet();
		for (Iterator<String> it = keySet.iterator(); it.hasNext();) {
			String name = it.next();
			String value = textParams.get(name);
			ds.writeBytes("--" + boundary + "\r\n");
			ds.writeBytes("Content-Disposition: form-data; name=\"" + name
					+ "\"\r\n");
			ds.writeBytes("\r\n");
			ds.writeBytes(encode(value) + "\r\n");
		}
	}
    //文件數據
	private void writeFileParams() throws Exception {
		Set<String> keySet = fileparams.keySet();
		for (Iterator<String> it = keySet.iterator(); it.hasNext();) {
			String name = it.next();
			File value = fileparams.get(name);
			ds.writeBytes("--" + boundary + "\r\n");
			ds.writeBytes("Content-Disposition: form-data; name=\"" + name
					+ "\"; filename=\"" + encode(value.getName()) + "\"\r\n");
			ds.writeBytes("Content-Type: " + getContentType(value) + "\r\n");
			ds.writeBytes("\r\n");
			ds.write(getBytes(value));
			ds.writeBytes("\r\n");
		}
	}
    //獲取文件的上傳類型，圖片格式爲image/png,image/jpg等。非圖片爲application/octet-stream
	private String getContentType(File f) throws Exception {
		
//		return "application/octet-stream";  // 此行不再細分是否爲圖片，全部作爲application/octet-stream 類型
		ImageInputStream imagein = ImageIO.createImageInputStream(f);
		if (imagein == null) {
			return "application/octet-stream";
		}
		Iterator<ImageReader> it = ImageIO.getImageReaders(imagein);
		if (!it.hasNext()) {
			imagein.close();
			return "application/octet-stream";
		}
		imagein.close();
		return "image/" + it.next().getFormatName().toLowerCase();//將FormatName返回的值轉換成小寫，默認爲大寫

	}
    //把文件轉換成字節數組
	private byte[] getBytes(File f) throws Exception {
		FileInputStream in = new FileInputStream(f);
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		byte[] b = new byte[1024];
		int n;
		while ((n = in.read(b)) != -1) {
			out.write(b, 0, n);
		}
		in.close();
		return out.toByteArray();
	}
	//添加結尾數據
	private void paramsEnd() throws Exception {
		ds.writeBytes("--" + boundary + "--" + "\r\n");
		ds.writeBytes("\r\n");
	}
	// 對包含中文的字符串進行轉碼，此爲UTF-8。服務器那邊要進行一次解碼
    private String encode(String value) throws Exception{
    	return URLEncoder.encode(value, "UTF-8");
    }
	public static void main(String[] args) throws Exception {
		HttpPostUtil u = new HttpPostUtil("http://xxxxxx.action");
		u.addTextParameter("path", "qs/");
		u.addTextParameter("fileName", "111.jpg");
		u.addFileParameter("picFile", new File(
				"D://272.jpg"));
		u.addTextParameter("text", "utf-8");
		byte[] b = u.send();
		String result = new String(b);
		System.out.println(result);

	}

}

=====================
socket   client

package test.socket;

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.URL;

/**
 * 文件發送客戶端主程序
 * @author admin_Hzw
 *
 */
public class BxClient {
	
	/**
	 * 程序main方法
	 * @param args
	 * @throws IOException
	 */
	public static void main(String[] args) throws IOException {
		
		int length = 0;
		double sumL = 0 ;
		byte[] sendBytes = null;
		Socket socket = null;
		DataOutputStream dos = null;
		FileInputStream fis = null;
		boolean bool = false;
		try {
			File file = new File("d:/272.jpg"); //要傳輸的文件路徑
			long l = file.length(); 
			socket = new Socket();  
			socket.connect(new InetSocketAddress("192.168.1.110", 8877));
			dos = new DataOutputStream(socket.getOutputStream());
			fis = new FileInputStream(file);      
			sendBytes = new byte[1024];  
			while ((length = fis.read(sendBytes, 0, sendBytes.length)) > 0) {
				sumL += length;  
				System.out.println("已傳輸："+((sumL/l)*100)+"%");
				dos.write(sendBytes, 0, length);
				dos.flush();
			} 
			//雖然數據類型不同，但JAVA會自動轉換成相同數據類型後在做比較
			if(sumL==l){
				bool = true;
			}
		}catch (Exception e) {
			System.out.println("客戶端文件傳輸異常");
			bool = false;
			e.printStackTrace();  
		} finally{  
			if (dos != null)
				dos.close();
			if (fis != null)
				fis.close();   
			if (socket != null)
				socket.close();    
		}
		System.out.println(bool?"成功":"失敗");
	}
}

socket server

web.xml

 <listener>  
  <listener-class>XXX.web.listener.SocketServiceLoader</listener-class>  
</listener>  

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class SocketServiceLoader implements ServletContextListener { //socket server 線程  
    private SocketThread socketThread;  
      
    @Override  
    public void contextDestroyed(ServletContextEvent arg0) {  
        if(null!=socketThread && !socketThread.isInterrupted())  
        {  
         socketThread.closeSocketServer();  
         socketThread.interrupt();  
        }  
 }  
  
    @Override  
    public void contextInitialized(ServletContextEvent arg0) {  
        // TODO Auto-generated method stub  
        if(null==socketThread)  
        {  
         //新建線程類  
         socketThread=new SocketThread(null);  
         //啓動線程  
         socketThread.start();  
        }  
    }  }

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class SocketThread extends Thread{  
    private ServerSocket serverSocket = null;  
      
    public SocketThread(ServerSocket serverScoket){  
        try {  
            if(null == serverSocket){  
                this.serverSocket = new ServerSocket(8877);  
                System.out.println("socket start");  
            }  
        } catch (Exception e) {  
            System.out.println("SocketThread創建socket服務出錯");  
            e.printStackTrace();  
        }  
  
    }  
      
    public void run(){  
        while(!this.isInterrupted()){  
            try {  
                Socket socket = serverSocket.accept();  
                  
                if(null != socket && !socket.isClosed()){     
                    //處理接受的數據  
                    new SocketOperate(socket).start();  
                }  
                socket.setSoTimeout(30000);  
                  
            }catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
    }  
      
      
    public void closeSocketServer(){  
       try {  
            if(null!=serverSocket && !serverSocket.isClosed())  
            {  
             serverSocket.close();  
            }  
       } catch (IOException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
       }  
     }  
      
      
}

import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.Random;
public class SocketOperate extends Thread{  
    private Socket socket;  
      
    public SocketOperate(Socket socket) {  
       this.socket=socket;  
    }  
    @SuppressWarnings("unused")  
   public void run()  
    {  
        try{   
			System.out.println("開始監聽...");
			/*
			 * 如果沒有訪問它會自動等待
			 */
			System.out.println("有鏈接");
			receiveFile(socket);
		} catch (Exception e) {
			System.out.println("服務器異常");
			e.printStackTrace();
		}   
    } 
    
    
    /*public void run() {
	}*/

	/**
	 * 接收文件方法
	 * @param socket
	 * @throws IOException
	 */
	public static void receiveFile(Socket socket) throws IOException {
		byte[] inputByte = null;
		int length = 0;
		DataInputStream dis = null;
		FileOutputStream fos = null;
		String filePath = "D:/temp/"+new Random().nextInt(10000)+".jpg";
		try {
			try {
				dis = new DataInputStream(socket.getInputStream());
				File f = new File("D:/temp");
				if(!f.exists()){
					f.mkdir();  
				}
				/*  
				 * 文件存儲位置  
				 */
				fos = new FileOutputStream(new File(filePath));    
				inputByte = new byte[1024];   
				System.out.println("開始接收數據...");  
				while ((length = dis.read(inputByte, 0, inputByte.length)) > 0) {
					fos.write(inputByte, 0, length);
					fos.flush();    
				}
				System.out.println("完成接收："+filePath);
			} finally {
				if (fos != null)
					fos.close();
				if (dis != null)
					dis.close();
				if (socket != null)
					socket.close(); 
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}