java中TCP两个例子大写服务器和文件上传

package com.core.net;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

class TransClient{
	
	public static void main(String[] args) throws Exception {
		
		Socket socket = new Socket("localhost", 10005);
		
		//键盘输入
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		//socket输入流
		BufferedReader bufin = new BufferedReader(new InputStreamReader(socket.getInputStream()));
		//socket输出流
	//	BufferedWriter bufout = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
		
		PrintWriter bufout = new PrintWriter(socket.getOutputStream(),true);
		
		String line = null;
		while((line = reader.readLine())!=null){
			
			if("over".equals(line))
				break;
			bufout.println(line);
//			bufout.write(line);
//			bufout.newLine();//***要注意 "\r\n"
//			bufout.flush();
		
			String str = bufin.readLine();
			System.out.println("server:"+str);
			
		}
		reader.close();
		socket.close();
		
	}
}

class TransServer{
	
	public static void main(String[] args) throws Exception {
		
		ServerSocket ss = new ServerSocket(10005);
		
		     Socket s = ss.accept();
		     String ip = s.getInetAddress().getHostAddress();
		     System.out.println(ip+"......connection");
		 BufferedReader reader = new BufferedReader(new InputStreamReader(s.getInputStream()));
		// BufferedWriter out = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
		 PrintWriter out = new PrintWriter(s.getOutputStream(),true);
		 
		 String line = null;
		
		 while((line = reader.readLine())!=null){
			 
			 System.out.println(line);
			 out.println(line.toUpperCase());
//			 out.write(line.toUpperCase());
//			 out.newLine();
//			 out.flush();
		 }
		 s.close();
		 ss.close();
	}
}
public class TransDemo {

	public static void main(String[] args) {
		
	}
}

package com.core.net;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
/*
 *将文件上传 
 *
 */
class TextClient{
	
	public static void main(String[] args) throws Exception {
		
		Socket s = new Socket("localhost", 10006);
		//注意这里的文件路径非常重要，找了好久的错误
		BufferedReader reader = new BufferedReader(new FileReader("src/com/core/net/IPDemo.java"));
		
		PrintWriter bufout = new PrintWriter(s.getOutputStream(),true);
		
		
		
		String line = null;
		while((line = reader.readLine())!=null){
			bufout.println(line);
		}
		
		s.shutdownOutput();//关闭数据流，输出结束标志
		
		BufferedReader bufin = new BufferedReader(new InputStreamReader(s.getInputStream()));
		String str = bufin.readLine();
		System.out.println(str);
		reader.close();
		s.close();
	}
}
class TextServer{
	
	public static void main(String[] args) throws Exception {
		
		ServerSocket ss = new ServerSocket(10006);
		
		Socket s = ss.accept();
		String ip = s.getInetAddress().getHostAddress();
		System.out.println(ip+".....connection");
		
		BufferedReader bufin = new BufferedReader(new InputStreamReader(s.getInputStream()));
		
		PrintWriter out = new PrintWriter(new FileWriter("server.txt"),true);
		
		String line = null;
		while((line =bufin.readLine())!=null){
			out.println(line);
		}
		PrintWriter pw = new PrintWriter(s.getOutputStream(),true);
		
		pw.println("上传成功");
		
		out.close();
		s.close();
		ss.close();
	}
}

public class UploadText {

	public static void main(String[] args) {
		
	}
}