java 输入输出与socket

//一个创建socket的例子
import java.net.*;
import java.io.*;

class server
{
    public static void main(String args[]){
        try{
            ServerSocket SS1=new ServerSocket(1234);
            System.out.println("Serversocket is created!");
            System.out.println("SS1.getLocalPort()="+SS1.getLocalPort());
            //SS1.close();
            System.out.println("SS1 is closed");

            ServerSocket ss2=new ServerSocket(0,2);
            System.out.println("serversocket ss2 is created");
            System.out.println("SS2.getLocalPort()="+ss2.getLocalPort());
            ss2.close();
            System.out.println("ss2 is closed");
        }
     catch(IOException e)
        {
         System.out.println(e.getMessage());
        }
    }

}

第二个例子

//一个读文件属性的例子
import java.io.File;
import java.util.Date;
class file_objects{
    public static void main(String args[]) throws java.io.IOException{
        if (args.length<1)
        {
            System.out.println("Usage:java file_objects[]");
            System.exit(1);
        }

        String fileName=args[0];
        File f=new File(fileName);

        System.out.println("the file is ");
        System.out.println("File name:"+f.getName());
        System.out.println("File name:"+f.getName());
        System.out.println("Canonical File Name:"+f.getCanonicalFile());
        System.out.println("can writeable:"+f.canWrite());
        System.out.println("length:"+f.length());
        System.out.println("Hidden:"+f.isHidden());
        System.out.println("isFile:"+f.isFile());
        System.out.println("isDirectory:"+f.isDirectory());
        System.out.println("LastModified:"+new Date(f.lastModified()));
    }
}

以下为一server&client 的例子:

以下为

import java.net.*;
import java.io.*;

public class server {
public static void main(String[] args) {
  Socket socket=null;
  BufferedReader br=null;
  PrintWriter pw=null;
  try {
   //创建服务器,并开放3081端口
   ServerSocket server=new ServerSocket(3081);
   while(true){

    //监听服务器端口，一旦有数据发送过来，那么就将数据封装成socket对象
    //如果没有数据发送过来，那么这时处于线程阻塞状态，不会向下继续执行
    socket=server.accept();
    System.out.println("客户端信息："+socket.getRemoteSocketAddress());
    //从socket中得到读取流，该流中有客户端发送过来的数据
    InputStream in=socket.getInputStream();
    //InputStreamReader将字节流转化为字符流
    br=new BufferedReader(new InputStreamReader(in));
    //行读取客户端数据
    String info=br.readLine();
    System.out.println(info);


    OutputStream out=socket.getOutputStream();
    pw=new PrintWriter(out);
    pw.println("服务器说：hello,everyone,I love you ");
    pw.flush();
   }

  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }finally{

   try {
    pw.close();
    br.close();
    socket.close();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }

}
}

import java.net.*;
import java.io.*;

public class client {
    public static void main(String[] args) {
  Socket socket=null;
  PrintWriter pw=null;
  BufferedReader br=null;
  try {
   //创建socket对象，并指明服务器的IP地址和端口号
   socket=new Socket("localhost",3081);
   //得到socket发送数据的输出流
   OutputStream out=socket.getOutputStream();
   //将字节流包装成字符流
   pw=new PrintWriter(out);

   //向服务器发送数据
   pw.println("客户端说：hi");
   //刷新流，确保数据能写到服务器
   pw.flush();

   InputStream in=socket.getInputStream();

   br=new BufferedReader(new InputStreamReader(in));
   String info=br.readLine();
   System.out.println(info);
   } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  finally{
   try {
    pw.close();
    socket.close();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
}
}

服务端:
D:\javasource>java server
客户端信息：/127.0.0.1:49589
客户端说：hi
客户端:

D:\javasource>netstat -an|find "3081"
TCP 0.0.0.0:3081 0.0.0.0:0 LISTENING
TCP [::]:3081 [::]:0 LISTENING

D:\javasource>java client
服务器说：hello,everyone,I love you

jdbc的例子:
顺带一个

Java Programming with Oracle JDBC

by Donald Bales

ISBN: 059600088X

Publisher: O'Reilly

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.sql.*;

public class jdbc {

public static void main(String args[]) {

try {

Class.forName("oracle.jdbc.driver.OracleDriver");

} catch (ClassNotFoundException e) {

System.out

.println("Oops! Can't find class oracle.jdbc.driver.OracleDriver");

System.exit(1);

}

Connection conn = null;

Statement stmt = null;

ResultSet rset = null;

try {

conn = DriverManager.getConnection(

"jdbc:oracle:thin:@192.168.100.203:1521:instancename", "username", "password");

stmt = conn.createStatement();

rset = stmt

.executeQuery("select 'Hello '||USER||'!' result from dual");

while (rset.next())

System.out.println(rset.getString(1));

rset.close();

rset = null;

stmt.close();

stmt = null;

conn.close();

conn = null;

} catch (SQLException e) {

System.out.println("Darn! A SQL error: " + e.getMessage());

} finally {

if (rset != null)

try {

rset.close();

} catch (SQLException ignore) {

}

if (stmt != null)

try {

stmt.close();

} catch (SQLException ignore) {

}

if (conn != null)

try {

conn.close();

} catch (SQLException ignore) {

}

这样是不行的.

D:\temp>java -classpath d:\temp\ojdbc6.jar jdbc
错误: 找不到或无法加载主类 jdbc

D:\temp>java -classpath d:\temp\ojdbc6.jar;. jdbc
或者改环境变量:set classpath=%classpath%;.;d:\temp\ojdbc6.jar;%JRE_HOME%\lib\dt.jar
注:linux 下是java -classpath /root/ojdbc6.jar:. jdbc
或者export CLASSPATH=.:/home/ojdbc14.jar

posted on 2011-11-16 23:39 snowhill 阅读(336) 评论(0) 编辑收藏引用所属分类: java

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