TCP URL

最新推荐文章于 2024-10-17 21:40:42 发布

boon101

最新推荐文章于 2024-10-17 21:40:42 发布

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分类专栏： Java 文章标签： url tcp socket exception string import

本文链接：https://blog.youkuaiyun.com/boon101/article/details/6261953

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本文详细介绍了TCP通信的基本原理，包括ClientSocket与ServerSocket的工作方式、连接建立过程及端口配置等。此外，还提供了完整的Java代码示例，演示如何实现简单的TCP服务器与客户端交互。

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ClientSocket之间不能直接连接

ClientSocket向ServerSocket发出请求
ServerSocket收到请求时建立Socket 与请求的ClientSocket连接

ServerSocket 创建时可以指定端口号，也可以指定0 随机分配

ServerSocket(int port|,int backlog |,InetAddress bindAddr)
_____________端口号___连接数（默认50）__地址（适用于多网卡）

Socket("xxx.xxx.x.x",3306),

Socket中有输入输出流 InputStream,OutputStream

通过对象序列化使用ObjectOutputStream来传递对象

TCP保证传输但是不保证对方是否可以解读。

URL统一资源定位符 Uniform Resource Locator

HTTP消息头
Connection 本次后是否关闭
Accept-Language 语言
Content-length 内容长度
Range 内容范围
Content-Range 返回指定的部分内容

URL类 URLStreamHandler协议处理类
URL不能直接获取文件

工厂模式：隐藏子类，通过向工厂类传递的参数获得子类对象。

TCP测试：
import java.io.*;
import java.net.*;

public class TCPServer {
public static void main(String[] args) {
  ServerSocket ss=null;
  Socket s = null;
  //OutputStream out=null;
  //InputStream in=null;
  //BufferedReader br = null;
  //InputStreamReader isr = null;
  boolean goon = true;

   try {
    ss = new ServerSocket(9527);

   } catch (IOException e) {
    System.out.println("端口使用中...");
    e.printStackTrace();
   }

  while(goon){
   try {
    s = ss.accept();
    new Thread(new ServerRun(s)).start();

   } catch (IOException e) {
    System.out.println("建立与客户端连接失败...");
    e.printStackTrace();
   }
   finally {
    try{
     //br.close();
     //out.close();
     //s.close();

    } catch (Exception e){
     e.printStackTrace();
    }
   }
  }
  /*
  try {
   in = s.getInputStream();
   out = s.getOutputStream();
   isr = new InputStreamReader(in);
   br = new BufferedReader(isr);
   out.write("Welcome!".getBytes());
   //byte[] b = new byte[1024];
   //int len;
   String str="";
   while(true){
    str = "";
    str = br.readLine();
    if(str == "stop"){
     System.out.println(str);
    }
   }

  } catch (IOException e) {
   System.out.print("数据读写错误...");
   e.printStackTrace();
  }*/

}

}

class ServerRun implements Runnable{
Socket s = null;
OutputStream out=null;
InputStream in=null;
BufferedReader br = null;
InputStreamReader isr = null;

PrintWriter pw =null;

public ServerRun(Socket s){
  this.s= s;
}
@Override
public void run() {
  try {
   in = s.getInputStream();
   out = s.getOutputStream();
   isr = new InputStreamReader(in);
   br = new BufferedReader(isr);
    out.write("Welcome!".getBytes());
   out.flush();
   pw = new PrintWriter(out);

   //byte[] b = new byte[1024];
   //int len;
   String str="";
   String rstr = "";
   while(true){
    str = "";
    rstr ="";
    str = br.readLine();
    System.out.println(str);
    rstr = (new StringBuffer(str).reverse()).toString();
    if(str.equalsIgnoreCase("stop")){
     System.out.print("收到STOP,系统退出");
     System.exit(0);
    }
    else{
     System.out.println(rstr);
     pw.println(rstr);
     pw.close();
     br.close();
     s.close();
    }
   }

  } catch (IOException e) {
   System.out.print("数据读写错误...");
   e.printStackTrace();
  }finally {
   try{
    br.close();
    out.close();
    s.close();
   } catch (Exception e){
    e.printStackTrace();
   }
  }
}
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.*;

public class TCPClient {

/**
* @param args
*/
public static void main(String[] args) {
  Socket s = null;
  InputStream in=null;
  OutputStream out=null;
  InputStreamReader isr = null;
  getMassage gm=null;

  try {
    s = new Socket("127.0.0.1",9527);
  } catch (UnknownHostException e) {
   System.out.println("未知的地址...");
   e.printStackTrace();
  } catch (IOException e) {
   System.out.println("连接失败...");
   e.printStackTrace();
  }
  try {
   in = s.getInputStream();
   out = s.getOutputStream();
   gm = new getMassage(s);
   new Thread(gm).start();
   System.out.println("连接成功了！");
   String str = "";
   BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
   while(true){
     str = "";
     str = br.readLine();
     System.out.println(str+"恩，成功了，没有问题");
     out.write(str.getBytes());
     out.flush();
    }
   } catch (IOException e) {
    //System.out.print("stop");
    e.printStackTrace();
    //System.exit(-1);
   }
}
}
class getMassage implements Runnable{
Socket s = null;
public getMassage(Socket s) {
  this.s = s;
}
InputStream in = null;
public getMassage(InputStream in) {
  this.in = in;
}
public void run() {
  try {
   in = s.getInputStream();
  } catch (IOException e1) {
   System.out.println("没有拿到输入");
   e1.printStackTrace();
  }
  BufferedReader br = new BufferedReader(new InputStreamReader(in));
  String str="";
  while(true){
   str = "";
   try {
    str = br.readLine();
    System.out.println(str);
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }

}

}