Socket实现多张图片的传送

最近在做一个项目是要用到Socket实现从服务器端的指点目录下传输多张图片到客户端，备份服务器端的图片，同时删除原来的图片。我的客户端时android的。在开发过程中，我先用java测试通过后在移植到android上。我也是最近才接触socket，想实现上述功能，到网上找了一些资料没有找到满意的。后来就结合网上找的资料自己摸索，实现了上述功能，于是想分享一下，希望对各位有帮助。废话不说，直接上代码，如有雷同，请多多包涵。
服务器端：

import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.InputStreamReader;import java.net.ServerSocket;import java.net.Socket;public class Server {        //定义要读取的图片的路径public static final String IMAGE_PATH = "D:" +File.separator+ "ftp_temp" + File.separator;        //图片备份的文件夹路径public static final String TEMP_IMAGE_PATH = IMAGE_PATH + "temp" + File.separator;public static void main(String[] args) {try {ServerSocket server = new ServerSocket(9999);Socket client = server.accept();BufferedReader reader = new BufferedReader(new InputStreamReader(client.getInputStream()));DataOutputStream out = new DataOutputStream(new BufferedOutputStream(client.getOutputStream()));System.out.println("start server...");String line = reader.readLine();System.out.println("line -- > " + line);out = readImagesFromCard(out);out.flush();out.close();client.close();server.close();} catch(Exception e) {e.printStackTrace();}}//读取图片，并存放在socket下的outputStream输出流中public static DataOutputStream readImagesFromCard(DataOutputStream dos) {File[] files = null;try {InputStream inputStream = null;int size = 2 * 1024;byte[] buffer = new byte[size];byte[] b = null;int len;String path = IMAGE_PATH;File file = new File(path);if(file.isDirectory()) {files = file.listFiles();for(int i = 0 ; i < files.length ; i ++) {len = -1;if(files[i].isFile()) {inputStream = readImage(files[i]);dos.writeUTF(files[i].getName());dos.writeLong(files[i].length());while((len = inputStream.read(buffer)) != -1) {dos.write(buffer, 0, len);if(len != size) {//如果该图片的字节数不是size的倍数，则填满size个字节b = new byte[size - len];dos.write(b,0,b.length);} } //先关闭该文件的输入流，否则无法删除inputStream.close();files[i].delete();}}dos.writeUTF("end");}} catch(Exception e) {e.printStackTrace();}return dos;}        //如果该图片没有备份，则先备份，最后返回该文件的InputStream输入流public static InputStream readImage(File file) {FileInputStream inputStream = null;try {inputStream = new FileInputStream(file);File tempFile = new File(TEMP_IMAGE_PATH + file.getName());if(!tempFile.exists()) {tempFile.createNewFile();FileOutputStream outputStream = new FileOutputStream(tempFile);byte[] buffer = new byte[2 * 1024];int len = -1;while((len = inputStream.read(buffer)) != -1) {outputStream.write(buffer,0,len);}outputStream.close();inputStream.close();inputStream = null;inputStream = new FileInputStream(file);}} catch(Exception e) {e.printStackTrace();}return inputStream;}}

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客户端：

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.DataInputStream;import java.io.File;import java.io.FileOutputStream;import java.io.PrintWriter;import java.net.Socket;public class Client {private static final String PATH = "D:" + File.separator + "temp" + File.separator;public static void main(String[] args) {try {Socket socket = new Socket("127.0.0.1",9999);PrintWriter out = new PrintWriter(new BufferedOutputStream(socket.getOutputStream()));DataInputStream inputStream = new DataInputStream(new BufferedInputStream(socket.getInputStream()));System.out.println("start client....");out.println("sendImage");out.flush();System.out.println("sendImage....");byte[] buffer = new byte[2 * 1024];int len = -1;String imageName = null;FileOutputStream fos = null;File file = null;long fileLength = -1;while(true) {imageName = inputStream.readUTF();if(imageName != null && imageName.trim().equals("end")) {break;}file = new File(PATH + imageName);if(!file.exists()) {file.createNewFile();} else if(file.isFile()) {file.delete();file.createNewFile();} else if(file.isDirectory()) {continue;}fileLength = inputStream.readLong();len = -1;fos = new FileOutputStream(file);while(fileLength > 0) {len = inputStream.read(buffer);fos.write(buffer, 0, len);if(len != -1) {fileLength -= len;}}fos.flush();fos.close();fos = null;imageName = null;file = null;}out.close();socket.close();} catch(Exception e) {e.printStackTrace();}}}

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第一次发表文件，对各位造成的不便请多多包涵。