網路編程TCP(五)__編程

補充：網路編程tcp(二)

package com;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.InetAddress;import java.net.ServerSocket;import java.net.Socket;import java.net.UnknownHostException;import org.junit.Test;public class TestTcp1 {//用戶端@Testpublic void client(){Socket socket=null;OutputStream os=null;try {socket = new Socket(InetAddress.getByName("127.0.0.1"),9000);os = socket.getOutputStream();os.write("我是1號客戶，請多關照".getBytes());//向外輸出資料} catch (UnknownHostException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{if(os!=null){try {os.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(socket!=null){try {socket.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}//服務端@Testpublic void server(){ServerSocket server=null;Socket socket=null;InputStream is=null;try {server=new ServerSocket(9000);socket=server.accept();//accept拿到用戶端socket對象is=socket.getInputStream();//向程式裡寫入資料byte[] b=new byte[20];int len;while((len=is.read(b))!=-1){String str=new String(b,0,len);System.out.println(str);}System.out.println("小夥子：收到來自"+socket.getLocalAddress());} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{if(is!=null){try {is.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(socket!=null){try {socket.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(server!=null){try {server.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}}

上例是只能用戶端發送，伺服器接收。下面的例子是伺服器和用戶端互動。有問有答。

package com;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.InetAddress;import java.net.ServerSocket;import java.net.Socket;import java.net.UnknownHostException;import org.junit.Test;/** * 案例：用戶端給伺服器發送訊息，伺服器列印資訊。同時發出“已收到資訊”給客戶 * @author Administrator * */public class TestTcp2 {//用戶端@Testpublic void client(){Socket socket=null;OutputStream os=null;InputStream is=null;try {socket = new Socket(InetAddress.getByName("127.0.0.1"),9000);os = socket.getOutputStream();os.write("wo shi kehu 2".getBytes());//向外輸出資料，供伺服器讀取socket.shutdownOutput();//顯示告知，服務端“發送完了。。”，is=socket.getInputStream();byte[] b=new byte[50];int len;while((len=is.read(b))!=-1){String str=new String(b,0,len);System.out.println(str);}} catch (UnknownHostException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{if(is!=null){try {is.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(os!=null){try {os.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(socket!=null){try {socket.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}//服務端@Testpublic void server(){ServerSocket server=null;Socket socket=null;InputStream is=null;OutputStream os=null;try {server=new ServerSocket(9000);socket=server.accept();//accept拿到用戶端socket對象is=socket.getInputStream();//拿到用戶端的socket的資料向程式裡寫入資料byte[] b=new byte[20];int len;while((len=is.read(b))!=-1){String str=new String(b,0,len);System.out.println("fuwqi:收到了："+socket.getLocalAddress()+str);}//然後伺服器說了，我收到資訊我也給你回饋os=socket.getOutputStream();os.write("shou dao ni de xinxile ,yihouhuihaohao guanzhao ni de ".getBytes());} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{if(os!=null){try {os.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(is!=null){try {is.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(socket!=null){try {socket.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(server!=null){try {server.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}}