TCP编程2： 客户端给服务器端发信息，服务器端将信息打印到控制台上，同时发送"已收到信息"给客户端

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;

/*

 * TCP编程例二：

 * 客户端给服务器端发信息，服务器端将信息打印到控制台上，同时发送"已收到信息"给客户端

 */

public class TestTCP2 {
/*
* 客户端
*/
@Test
public void client() {
Socket socket = null;
OutputStream os = null;
InputStream is = null;
try {
socket = new Socket(InetAddress.getByName("127.0.0.1"), 9898);
os = socket.getOutputStream();
String str = "我是客户端，请接收。";
os.write(str.getBytes());
//shutdownOutput()：显示的告诉服务器端我已经输出完毕
socket.shutdownOutput();
is = socket.getInputStream();
byte[] b = new byte[100];
int len;
while ((len = is.read(b)) != -1) {
str = new String(b, 0, len);
System.out.println(str);
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if(is != null){
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (os != null) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

/*
* 服务器端
*/
@Test
public void server() {
ServerSocket ss = null;
Socket socket = null;
InputStream is = null;
OutputStream os = null;
try {
ss = new ServerSocket(9898);
socket = ss.accept();
is = socket.getInputStream();
byte[] b = new byte[100];
int len;
while ((len = is.read(b)) != -1) {
String str = new String(b, 0, len);
System.out.println(str);
}
os = socket.getOutputStream();
os.write("收到信息。".getBytes());
//这边也显示的告诉客户端，我输出完毕
socket.shutdownOutput();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (ss != null) {
try {
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

}