java socket文件传输
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- package com.socket.sample;
- import java.io.BufferedInputStream;
- import java.io.DataInputStream;
- import java.io.DataOutputStream;
- import java.io.File;
- import java.io.FileInputStream;
- import java.net.ServerSocket;
- import java.net.Socket;
- public class ServerTest {
- int port = 8821;
- void start() {
- Socket s = null;
- try {
- ServerSocket ss = new ServerSocket(port);
- while (true) {
- // 选择进行传输的文件
- String filePath = "D:\\lib.rar";
- File fi = new File(filePath);
- System.out.println("文件长度:" + (int) fi.length());
- // public Socket accept() throws
- // IOException侦听并接受到此套接字的连接。此方法在进行连接之前一直阻塞。
- s = ss.accept();
- System.out.println("建立socket链接");
- DataInputStream dis = new DataInputStream(
- new BufferedInputStream(s.getInputStream()));
- dis.readByte();
- DataInputStream fis = new DataInputStream(
- new BufferedInputStream(new FileInputStream(filePath)));
- DataOutputStream ps = new DataOutputStream(s.getOutputStream());
- // 将文件名及长度传给客户端。这里要真正适用所有平台,例如中文名的处理,还需要加工,具体可以参见Think In Java
- // 4th里有现成的代码。
- ps.writeUTF(fi.getName());
- ps.flush();
- ps.writeLong((long) fi.length());
- ps.flush();
- int bufferSize = 8192;
- byte[] buf = new byte[bufferSize];
- while (true) {
- int read = 0;
- if (fis != null) {
- read = fis.read(buf);
- // 从包含的输入流中读取一定数量的字节,并将它们存储到缓冲区数组 b
- // 中。以整数形式返回实际读取的字节数。在输入数据可用、检测到文件末尾 (end of file)
- // 或抛出异常之前,此方法将一直阻塞。
- }
- if (read == -1) {
- break;
- }
- ps.write(buf, 0, read);
- }
- ps.flush();
- // 注意关闭socket链接哦,不然客户端会等待server的数据过来,
- // 直到socket超时,导致数据不完整。
- fis.close();
- s.close();
- System.out.println("文件传输完成");
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- public static void main(String arg[]) {
- new ServerTest().start();
- }
- }
客户端工具(SocketTool)
- package com.socket.sample;
- import java.io.BufferedInputStream;
- import java.io.DataInputStream;
- import java.io.DataOutputStream;
- import java.net.Socket;
- public class ClientSocket {
- private String ip;
- private int port;
- private Socket socket = null;
- DataOutputStream out = null;
- DataInputStream getMessageStream = null;
- public ClientSocket(String ip, int port) {
- this.ip = ip;
- this.port = port;
- }
- /** */
- /**
- * 创建socket连接
- *
- * @throws Exception
- * exception
- */
- public void CreateConnection() throws Exception {
- try {
- socket = new Socket(ip, port);
- } catch (Exception e) {
- e.printStackTrace();
- if (socket != null)
- socket.close();
- throw e;
- } finally {
- }
- }
- public void sendMessage(String sendMessage) throws Exception {
- try {
- out = new DataOutputStream(socket.getOutputStream());
- if (sendMessage.equals("Windows")) {
- out.writeByte(0x1);
- out.flush();
- return;
- }
- if (sendMessage.equals("Unix")) {
- out.writeByte(0x2);
- out.flush();
- return;
- }
- if (sendMessage.equals("Linux")) {
- out.writeByte(0x3);
- out.flush();
- } else {
- out.writeUTF(sendMessage);
- out.flush();
- }
- } catch (Exception e) {
- e.printStackTrace();
- if (out != null)
- out.close();
- throw e;
- } finally {
- }
- }
- public DataInputStream getMessageStream() throws Exception {
- try {
- getMessageStream = new DataInputStream(new BufferedInputStream(
- socket.getInputStream()));
- return getMessageStream;
- } catch (Exception e) {
- e.printStackTrace();
- if (getMessageStream != null)
- getMessageStream.close();
- throw e;
- } finally {
- }
- }
- public void shutDownConnection() {
- try {
- if (out != null)
- out.close();
- if (getMessageStream != null)
- getMessageStream.close();
- if (socket != null)
- socket.close();
- } catch (Exception e) {
- }
- }
- }
客户端(Client)
- package com.socket.sample;
- import java.io.BufferedOutputStream;
- import java.io.DataInputStream;
- import java.io.DataOutputStream;
- import java.io.FileOutputStream;
- public class ClientTest {
- private ClientSocket cs = null;
- private String ip = "localhost";// 设置成服务器IP
- private int port = 8821;
- private String sendMessage = "Windows";
- public ClientTest() {
- try {
- if (createConnection()) {
- sendMessage();
- getMessage();
- }
- } catch (Exception ex) {
- ex.printStackTrace();
- }
- }
- private boolean createConnection() {
- cs = new ClientSocket(ip, port);
- try {
- cs.CreateConnection();
- System.out.print("连接服务器成功!" + "\n");
- return true;
- } catch (Exception e) {
- System.out.print("连接服务器失败!" + "\n");
- return false;
- }
- }
- private void sendMessage() {
- if (cs == null)
- return;
- try {
- cs.sendMessage(sendMessage);
- } catch (Exception e) {
- System.out.print("发送消息失败!" + "\n");
- }
- }
- private void getMessage() {
- if (cs == null)
- return;
- DataInputStream inputStream = null;
- try {
- inputStream = cs.getMessageStream();
- } catch (Exception e) {
- System.out.print("接收消息缓存错误\n");
- return;
- }
- try {
- // 本地保存路径,文件名会自动从服务器端继承而来。
- String savePath = "E:\\";
- int bufferSize = 8192;
- byte[] buf = new byte[bufferSize];
- int passedlen = 0;
- long len = 0;
- savePath += inputStream.readUTF();
- DataOutputStream fileOut = new DataOutputStream(
- new BufferedOutputStream(new FileOutputStream(savePath)));
- len = inputStream.readLong();
- System.out.println("文件的长度为:" + len + "\n");
- System.out.println("开始接收文件!" + "\n");
- while (true) {
- int read = 0;
- if (inputStream != null) {
- read = inputStream.read(buf);
- }
- passedlen += read;
- if (read == -1) {
- break;
- }
- // 下面进度条本为图形界面的prograssBar做的,这里如果是打文件,可能会重复打印出一些相同的百分比
- System.out.println("文件接收了" + (passedlen * 100 / len) + "%\n");
- fileOut.write(buf, 0, read);
- }
- System.out.println("接收完成,文件存为" + savePath + "\n");
- fileOut.close();
- } catch (Exception e) {
- System.out.println("接收消息错误" + "\n");
- return;
- }
- }
- public static void main(String arg[]) {
- new ClientTest().getMessage();
- }
- }
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