java网络编程--3 TCP
1.6、TCP
客户端
- 连接服务器 Socket
- 发送消息
package com.ssl.lesson02;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
//客户端
public class TcpClientDemo01 {
public static void main(String[] args) {
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("你瞅啥".getBytes());
} catch (Exception e) {
e.printStackTrace();
} finally {
if(os!=null){
try {
os.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
if (socket!=null) {
try {
socket.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
}
}
服务端
- 建立服务的端口ServerSocket
- 等待用户连接accept
- 接收用的消息
package com.ssl.lesson02;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
//服务端
public class TcpServicerDemo01 {
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,服务插槽
serverSocket = new ServerSocket(9999);
while(true) {
//2.等待客户端连接过来
socket = serverSocket.accept();
//3.读取客户端的消息
is = socket.getInputStream();
//初学者读取方式
/* 会出现乱码
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 (Exception e) {
e.printStackTrace();
}finally {
//关闭资源流
if(baos!=null){
try {
baos.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
if(is!=null){
try {
is.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
if(socket!=null){
try {
socket.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
if(serverSocket != null){
try {
serverSocket.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
}
}
文件上传
客户端:
package com.ssl.lesson02;
import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
public class TcpClientDemo02 {
public static void main(String[] args) throws Exception{
//1.创建一个Socket连接
Socket socket = new Socket(InetAddress.getByName("127.0.0.1"),9000);
//2.创建一个输出流
OutputStream os = socket.getOutputStream();
//3.文件流,读取文件
FileInputStream fis = new FileInputStream(new File("1.jpg"));
//4.写出文件
byte[] buffer = new byte[1024];
int len;
while((len=fis.read(buffer))!=-1){
os.write(buffer,0,len);
}
//通知服务器我已经结束了
socket.shutdownOutput(); //我已经传输完了
//确定服务器接收完毕,才能够断开连接
InputStream is = socket.getInputStream();
//String byte[]
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer2 = new byte[1024];
int len2;
while((len2=is.read(buffer2))!=-1){
baos.write(buffer2,0,len2);
}
System.out.println(baos.toString());
//5.关闭资源
baos.close();
is.close();
fis.close();
os.close();
socket.close();
}
}
服务端:
package com.ssl.lesson02;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class TcpServicerDemo02 {
public static void main(String[] args) throws Exception{
//1.创建服务
ServerSocket serverSocket = new ServerSocket(9000);
//2.监听客户端的连接
Socket socket = serverSocket.accept(); //阻塞式监听,会一直等待客户端连接
//3.获取输入流
InputStream is = socket.getInputStream();
//4.文件输出
FileOutputStream fos = new FileOutputStream(new File("receive.png"));
byte[] buffer = new byte[1024];
int len;
while((len=is.read(buffer))!=-1){
fos.write(buffer,0,len);
}
//通知客户端,我接收完毕了
OutputStream os = socket.getOutputStream();
os.write("我接收完毕了,可以断开了".getBytes());
//5.关闭输入输出
os.close();
fos.close();
is.close();
socket.close();
serverSocket.close();
}
}
Tomcat
服务端:
- 自定义S
- Tomcat服务器
客户端:
- 自定义C
- 浏览器