## 1.6 TCP

#### 客户端

1.连接服务器Socket

2.发送消息

#### 服务器

1.建立服务的端口ServerSocket

2.等待用户的链接accept
3.接收用的消息

服务器

```java
package com.zishi.lesson2;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.net.ServerSocket;

//服务端
public class TcpSeverDemo01 {
public static void main(String[] args) {
ServerSocket serverSocket = null;
Socket socket = null;
InputStream is = null;
ByteArrayOutputStream baos = null;
try {
//1.我得有一个地址
serverSocket = new ServerSocket(9999);
//socket 插座，插槽
//2.等待客户端的消息
socket = serverSocket.accept();
//3.读取客户端的消息
is = socket.getInputStream();

/*
byte[] buffer = new byte[1024];
int len;
while((len=is.read(buffer))!=-1){
String msg = new String(buffer,0,len);
System.out.println(msg);
}
*/

//管道流
baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while((len=is.read(buffer))!=-1){
baos.write(buffer,0,len);
}
System.out.println(baos.toString());

} catch (IOException e) {
e.printStackTrace();
}finally {
//关闭资源
if(baos!=null){
try {
baos.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(serverSocket!=null){
try {
serverSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}

}
}
}
```

客户端

```java
package com.zishi.lesson2;

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

//客户端
public class TcpClientDemo01 {
public static void main(String[] args) throws UnknownHostException {
Socket socket = null;
OutputStream os =null;
try {
//1.要知道服务器的地址 端口号
InetAddress serverIP = InetAddress.getByName("127.0.0.1");
int port =9999;
//2.创建一个socket连接
socket = new Socket(serverIP,port);
//3.发送消息IO流
os = socket.getOutputStream();
os.write("小心兽人控".getBytes());

} catch (Exception e) {
e.printStackTrace();
}finally {
if(os!=null){
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (socket!=null){
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
```

TCP