簡易的案例

客戶端：

package demo;import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.Socket;public class TCPClient {public static void main(String[] args) throws IOException {Socket socket = new Socket("127.0.0.1", 7000);OutputStream out = socket.getOutputStream();out.write("hello".getBytes());InputStream in = socket.getInputStream();byte[] data = new byte[1024];int len = in.read(data);System.out.println(new String(data, 0, len));socket.close();} } View Code

服務器端：

package demo;import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.ServerSocket; import java.net.Socket;public class TCPServer {public static void main(String[] args) throws IOException {ServerSocket server = new ServerSocket(7000);Socket socket = server.accept();InputStream in = socket.getInputStream();byte[] data = new byte[1024];int len = in.read(data);System.out.println(new String(data, 0, len));OutputStream out = socket.getOutputStream();out.write("收到".getBytes());socket.close();server.close();} } View Code

先啟動服務器端，再啟動客戶端，服務器端打印:hello，然后客戶端打印:收到

注意區分這里的流對象

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接下來在這個案例基礎上做一個圖片上傳案例

圖片上傳的本質就是文件復制

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客戶端：

package demo1;import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.Socket;public class TCPClient {public static void main(String[] args) throws IOException {Socket socket = new Socket("127.0.0.1", 7000);OutputStream out = socket.getOutputStream();FileInputStream fis = new FileInputStream("d:\\666.jpeg");int len = 0;byte[] bytes = new byte[1024];while ((len = fis.read(bytes)) != -1) {out.write(bytes, 0, len);}socket.shutdownOutput();// 服務器端讀不到-1，不會終止，調用這個方法可以終止InputStream in = socket.getInputStream();len = in.read(bytes);System.out.println(new String(bytes, 0, len));fis.close();socket.close();} } View Code

服務器端：

package demo1;import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.ServerSocket; import java.net.Socket; import java.util.Random;public class TCPServer {public static void main(String[] args) throws IOException {ServerSocket server = new ServerSocket(7000);Socket socket = server.accept();InputStream in = socket.getInputStream();File upload = new File("d:\\upload");if (!upload.exists()) {upload.mkdirs();}String filename = System.currentTimeMillis() + new Random().nextInt(999999) + ".jpeg";FileOutputStream fos = new FileOutputStream(upload + File.separator + filename);// 這里是處理圖片重名的問題byte[] bytes = new byte[1024];int len = 0;while ((len = in.read(bytes)) != -1) {fos.write(bytes, 0, len);}socket.getOutputStream().write("上傳成功".getBytes());fos.close();socket.close();server.close();} } View Code

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如果多個客戶端一起上傳，就需要多線程的技術，每個客戶端占一個線程

客戶端不需要修改

服務器端：

package demo1;import java.io.IOException; import java.net.ServerSocket; import java.net.Socket;public class TCPServer {public static void main(String[] args) throws IOException {ServerSocket server = new ServerSocket(7000);while (true) {Socket socket = server.accept();new Thread(new Upload(socket)).start();}} } View Code package demo1; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.ServerSocket; import java.net.Socket; import java.util.Random;public class Upload implements Runnable {private Socket socket;public Upload(Socket socket) {this.socket = socket;}public void run() {try {InputStream in = socket.getInputStream();File upload = new File("d:\\upload");if (!upload.exists()) {upload.mkdirs();}String filename = System.currentTimeMillis() + new Random().nextInt(999999) + ".jpeg";FileOutputStream fos = new FileOutputStream(upload + File.separator + filename);// 這里是處理圖片重名的問題byte[] bytes = new byte[1024];int len = 0;while ((len = in.read(bytes)) != -1) {fos.write(bytes, 0, len);}socket.getOutputStream().write("上傳成功".getBytes());fos.close();socket.close();} catch (IOException ex) {System.out.println(ex);}} } View Code

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轉載于:https://www.cnblogs.com/xuyiqing/p/8340623.html

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