关于Java网络编程的几个实例
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1.使用UDＰ编程
服务端：
package net.csdn.udt;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
public class ThreadReceiver implements Runnable{
/**
* @param args
*/
public static void main(String[] args) {
new Thread(new ThreadReceiver()).start();
Runnable r=new Runnable(){
public void run() {
try{
DatagramSocket ds=new DatagramSocket();
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String line=null;
while((line=br.readLine())!=null){
if(line.equals("ByeBye")){
System.out.println("Bye-Bye");
break;
}
byte[] buf=line.getBytes();
DatagramPacket dp=new DatagramPacket(buf, buf.length, InetAddress.getByName("192.168.49.234"),4455);
ds.send(dp);
}
ds.close();
}catch(Exception e){
e.toString();
}
}
};
new Thread(r).start();
Runnable r1=new Runnable(){
public void run() {
try{
DatagramSocket ds=new DatagramSocket();
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String line=null;
while((line=br.readLine())!=null){
if(line.equals("ByeBye")){
System.out.println("Bye-Bye");
break;
}
byte[] buf=line.getBytes();
DatagramPacket dp=new DatagramPacket(buf, buf.length, InetAddress.getByName("192.168.49.234"),9008);
ds.send(dp);
}
ds.close();
}catch(Exception e){
e.toString();
}
}
};
new Thread(r1).start();
Runnable r2 =new Runnable(){
@Override
public void run() {
try{
DatagramSocket ds=new DatagramSocket();
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String line=null;
while((line=br.readLine())!=null){
if(line.equals("ByeBye")){
System.out.println("Bye-Bye");
break;
}
byte[] buf=line.getBytes();
DatagramPacket dp=new DatagramPacket(buf, buf.length, InetAddress.getByName("192.168.49.13"),9008);
ds.send(dp);
}
ds.close();
}catch(Exception e){
e.toString();
}
}
};
new Thread(r2).start();
public void run() {
try{
DatagramSocket ds=new DatagramSocket(9008);
while(true){
byte[] buf=new byte[1024];
DatagramPacket dp=new DatagramPacket(buf,buf.length);
ds.receive(dp);
String ip=dp.getAddress().getHostAddress();
String data=new String(dp.getData(),0,dp.getLength());
System.out.println(ip+":"+data);
}
//ds.close();
}catch(Exception e){
e.toString();
}
}
}
客户端：
package net.csdn.udt;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
public class ThreadSender implements Runnable{
/**
* @param args
*/
public static void main(String[] args) {
new Thread(new ThreadSender()).start();
}
@Override
public void run() {
try{
DatagramSocket ds=new DatagramSocket();
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String line=null;
while((line=br.readLine())!=null){
if(line.equals("ByeBye")){
System.out.println("Bye-Bye");
break;
}
byte[] buf=line.getBytes();
DatagramPacket dp=new DatagramPacket(buf, buf.length, InetAddress.getByName("192.168.49.13"),4455);
ds.send(dp);
}
ds.close();
}catch(Exception e){
e.toString();
}
}
}
2.使用TCP协议编程
服务端：
/*客户端通过键盘录入信息，发送到服务器端
服务器端收到信息后，将信息转为大写返回给客户端。*/
package net.csdn.socket;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.net.ServerSocket;
import java.net.Socket;
public class TcpServer2 {
/**
* @param args
*/
public static void main(String[] args) throws Exception{
ServerSocket ss=new ServerSocket(9009);
Socket s=ss.accept();
System.out.println(s.getInetAddress().getHostAddress()+"...connection");
//读取客户的信息的输入流
InputStream in=s.getInputStream();
BufferedReader brin=new BufferedReader(new InputStreamReader(in));
//向客户端发送信息输出流
BufferedWriter brout=new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
String line=null;
while((line=brin.readLine())!=null){
System.out.println("client:"+line);
brout.write(line.toUpperCase());
brout.newLine();
brout.flush();
}
s.close();
ss.close();
}
}
客户端：
package net.csdn.socket;
import java.net.Socket;
import java.io.*;
public class TcpClient2 {
/**
* @param args
*/
public static void main(String[] args) throws Exception{
Socket s=new Socket("192.168.49.13",9009);
//获取键盘录入
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
//数据输出给服务器端
OutputStream out=s.getOutputStream();
BufferedWriter bwout=new BufferedWriter(new OutputStreamWriter(out));
//获取服务器端返回的数据
BufferedReader brin=new BufferedReader(new InputStreamReader(s.getInputStream()));
String line=null;
while((line=br.readLine())!=null){
if(line.equals("over"))
break;
bwout.write(line);
bwout.newLine();
bwout.flush();
String str=brin.readLine();
System.out.println("server:"+str);
}
br.close();
s.close();
}
}
3.使用TCP协议编写程序实现从客户端上传文本到服务端
服务端：
package net.csdn.tcp;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
public class UpdownLoadTextServer {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
ServerSocket ss =new ServerSocket();
Socket s =ss.accept();
System.out.println(s.getInetAddress().getHostAddress()+"is connecting...");
BufferedReader br =new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter pw =new PrintWriter("E:\\");
String line =null;
while((line=br.readLine())!=null){
}
}
}
客户端：
package net.csdn.tcp;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
public class UpdownLoadTextClient {
/**
* @param args
* @throws IOException
* @throws UnknownHostException
*/
public static void main(String[] args) throws UnknownHostException, IOException {
Socket s =new Socket(InetAddress.getByName("192.168.49.13"), 1234);
BufferedReader br =new BufferedReader(new FileReader("D:\\c.sql"));
PrintWriter pw =new PrintWriter(s.getOutputStream());
String len =null;
while((len=br.readLine())!=null){
pw.println(len);
}
s.shutdownOutput();
InputStream inStream =s.getInputStream();
byte [] buf =new byte[1024];
int line =0;
while((line=inStream.read(buf, 0, buf.length))!=-1){
System.out.println(new String(buf));
}
}
}
4.使用TCP协议实现从客户端上传图片到服务端
服务端：
package net.csdn.tcp;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
public class UpdownLoadImageServer implements Runnable {
private Socket s;
public UpdownLoadImageServer(Socket s){
// new Thread(new UpdownLoadImageServer());
this.s=s;
}
public static void main(String[] args) throws IOException {
ServerSocket ss=new ServerSocket(1111);
// Socket s=ss.accept();在外面写会怎么样？
while(true){
Socket s=ss.accept();
new Thread(new UpdownLoadImageServer(s)).start();
}
}
@Override
public void run() {
try {
int count =1;
System.out.println(s.getInetAddress().getHostAddress()+"is connecting...");
String ip =s.getInetAddress().getHostName();
InputStream is =s.getInputStream();
File fd =new File("E:\\pic");
File fp=new File(fd,ip+"time"+count+".jpg");
if(fp.exists())
fp=new File(fd,ip+"time"+(count++)+".jpg");
FileOutputStream fos =new FileOutputStream(fp);
byte image[] =new byte[1024];
int len=0;
// int len=is.read(image);
//while(len!=-1){
while((len=is.read(image))!=-1){
//System.out.println(s.getInetAddress().getHostAddress()+"is connecting...");
fos.write(image, 0, len);
// fos.flush();//
}
OutputStream os=s.getOutputStream();
os.write("<font color ='red' >上传成功！</font>".getBytes());
// os.flush();
fos.close();
s.close();
} catch (Exception e) {
e.toString();
}
}
}
客户端：
package net.csdn.tcp;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
public class UpdownLoadImageClient {
/**
* @param args
* @throws IOException
* @throws UnknownHostException
*/
public static void main(String[] args) throws UnknownHostException, IOException {
Socket s = new Socket("192.168.49.13",1111);
//s.getInputStream();
if(args.length==0){
System.err.println("请指定一个合法的图片文件");
return;
}
if(args[0].endsWith(".wmf")||args[0].endsWith(".jpg")||args[0].endsWith(".jpeg")||args[0].endsWith(".gif")||args[0].endsWith("ai")||args[0].endsWith("pdg"))
{
File fd=new File(args[0]);
// File f =new File(fd);
FileInputStream fis =new FileInputStream(fd);
OutputStream os = s.getOutputStream();
byte [] image =new byte[1024];
// int len =fis.read(image);//如果这样写到了while循环里就只会执行一次了，所以看到的只是部分图片
int len =0;
while((len=fis.read(image))!=-1){
// while((len!=-1){
os.write(image, 0, len);
//os.flush();//
}
s.shutdownOutput();
InputStream is = s.getInputStream();
byte [] re =new byte[1024];
len =is.read(re);//这里怎么可以这样用？
// int i =is.read(re);
System.out.println(new String(re,0,len));
fis.close();
s.close();
}else{
System.err.println("非法的图片文件输入！");
}
}
}
5.使用无套接字的Socket（）实现客户端与服务端的连接
客户端：
package net.csdn.socket;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
public class NoParagramSocket {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
Socket s =new Socket();
String url ="192.168.49.13";
int port =4442;
SocketAddress socketAddress =new InetSocketAddress(url, port);
//s.connect(socketAddress,3);//可以设置连接超时
s.connect(socketAddress);//未设置连接超时
s.close();
}
}
服务端：
package net.csdn.socket;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
public class ServiceSocketer {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
ServerSocket ss =new ServerSocket(4442);
Socket s =ss.accept();
System.out.println(s.getInetAddress().getHostAddress()+"is connecting...");
InputStream inSteram =s.getInputStream();
BufferedReader br =new BufferedReader(new InputStreamReader(inSteram));
OutputStream outStream =s.getOutputStream();
BufferedWriter bw =new BufferedWriter(new OutputStreamWriter(outStream));
String line =null;
while((line=br.readLine())!=null){
System.out.println(s.getInetAddress().getHostAddress()+"发送请求：");
System.out.println(line);
// bw.write(line.toUpperCase());
bw.write("收到");
bw.newLine();
bw.flush();
}
br.close();
s.close();
}
}
6.关于ＵＲＬ类的使用
package net.csdn.socket;
import java.net.MalformedURLException;
import java.net.URL;
public class URLIntroduce {
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
String url ="http://www.csdn.net/csss/css.html?name = css";
URL ur =new URL(url);
String file =ur.getFile();
String path =ur.getPath();
int port =ur.getPort();
String host =ur.getHost();
String protocol =ur.getProtocol();
String query =ur.getQuery();
System.out.println("file:"+file);
System.out.println("path:"+path);
System.out.println("port:"+port);
System.out.println("host:"+host);
System.out.println("protocol:"+protocol);
System.out.println("query:"+query);
}
}
７.关于数据的转码、与加码
package net.csdn.socket;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
public class URLEDCoder {
/**
* @param args
* @throws UnsupportedEncodingException
*/
public static void main(String[] args) throws UnsupportedEncodingException {
String code =new String("站在峰顶看日落");
String ec =URLEncoder.encode(code, "utf-8");
System.out.println(ec);
System.out.println("____________");
String ecode =new String("%E7%AB%99%E5%9C%A8%E5%B3%B0%E9%A1%B6%E7%9C%8B%E6%97%A5%E8%90%BD");
String dcode =URLDecoder.decode(ecode, "utf-8");
System.out.println(dcode);
}
}
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