Java訪問(wèn)指定URL并獲取網(wǎng)頁(yè)源代碼

1．編寫(xiě)useSourceViewer 類的基本框架，該類僅包括無(wú)返回值的main ()方法，該方法從參數(shù)中獲取URL，通過(guò)輸入緩沖和輸出緩沖將該URL 原碼輸出。

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2．編寫(xiě)useSourceViewer 類，代碼如下：

import java.net.*;

import java.io.*;

public class useSourceViewer

{

public static void main (String[] args)

{

if (args.length 0)

{

try

{

//讀入U(xiǎn)RL

URL u = new URL(args[0]);

InputStream in = u.openStream( );

// 為增加性能存儲(chǔ)輸入流

in = new BufferedInputStream(in);

// 將輸入流連接到閱讀器

Reader r = new InputStreamReader(in);

int c;

while ((c = r.read( )) != -1)

{

System.out.print((char) c);

}

Object o = u.getContent( );

System.out.println("I got a " + o.getClass().getName( ));

}

catch (MalformedURLException e)

{

System.err.println(args[0] + " is not a parseable URL");

}

catch (IOException e)

{

System.err.println(e);

}

} // end if

} // end main

} // end SourceViewer}

java 聊天室 源代碼

【ClientSocketDemo.java 客戶端Java源代碼】

import java.net.*;

import java.io.*;

public class ClientSocketDemo

{

//聲明客戶端Socket對(duì)象socket

Socket socket = null;

//聲明客戶器端數(shù)據(jù)輸入輸出流

DataInputStream in;

DataOutputStream out;

//聲明字符串?dāng)?shù)組對(duì)象response，用于存儲(chǔ)從服務(wù)器接收到的信息

String response[];

//執(zhí)行過(guò)程中，沒(méi)有參數(shù)時(shí)的構(gòu)造方法，本地服務(wù)器在本地，取默認(rèn)端口10745

public ClientSocketDemo()

{

try

{

//創(chuàng)建客戶端socket，服務(wù)器地址取本地，端口號(hào)為10745

socket = new Socket("localhost",10745);

//創(chuàng)建客戶端數(shù)據(jù)輸入輸出流，用于對(duì)服務(wù)器端發(fā)送或接收數(shù)據(jù)

in = new DataInputStream(socket.getInputStream());

out = new DataOutputStream(socket.getOutputStream());

//獲取客戶端地址及端口號(hào)

String ip = String.valueOf(socket.getLocalAddress());

String port = String.valueOf(socket.getLocalPort());

//向服務(wù)器發(fā)送數(shù)據(jù)

out.writeUTF("Hello Server.This connection is from client.");

out.writeUTF(ip);

out.writeUTF(port);

//從服務(wù)器接收數(shù)據(jù)

response = new String[3];

for (int i = 0; i response.length; i++)

{

response[i] = in.readUTF();

System.out.println(response[i]);

}

}

catch(UnknownHostException e){e.printStackTrace();}

catch(IOException e){e.printStackTrace();}

}

//執(zhí)行過(guò)程中，有一個(gè)參數(shù)時(shí)的構(gòu)造方法，參數(shù)指定服務(wù)器地址，取默認(rèn)端口10745

public ClientSocketDemo(String hostname)

{

try

{

//創(chuàng)建客戶端socket，hostname參數(shù)指定服務(wù)器地址，端口號(hào)為10745

socket = new Socket(hostname,10745);

in = new DataInputStream(socket.getInputStream());

out = new DataOutputStream(socket.getOutputStream());

String ip = String.valueOf(socket.getLocalAddress());

String port = String.valueOf(socket.getLocalPort());

out.writeUTF("Hello Server.This connection is from client.");

out.writeUTF(ip);

out.writeUTF(port);

response = new String[3];

for (int i = 0; i response.length; i++)

{

response[i] = in.readUTF();

System.out.println(response[i]);

}

}

catch(UnknownHostException e){e.printStackTrace();}

catch(IOException e){e.printStackTrace();}

}

//執(zhí)行過(guò)程中，有兩個(gè)個(gè)參數(shù)時(shí)的構(gòu)造方法，第一個(gè)參數(shù)hostname指定服務(wù)器地址

//第一個(gè)參數(shù)serverPort指定服務(wù)器端口號(hào)

public ClientSocketDemo(String hostname,String serverPort)

{

try

{

socket = new Socket(hostname,Integer.parseInt(serverPort));

in = new DataInputStream(socket.getInputStream());

out = new DataOutputStream(socket.getOutputStream());

String ip = String.valueOf(socket.getLocalAddress());

String port = String.valueOf(socket.getLocalPort());

out.writeUTF("Hello Server.This connection is from client.");

out.writeUTF(ip);

out.writeUTF(port);

response = new String[3];

for (int i = 0; i response.length; i++)

{

response[i] = in.readUTF();

System.out.println(response[i]);

}

}

catch(UnknownHostException e){e.printStackTrace();}

catch(IOException e){e.printStackTrace();}

}

public static void main(String[] args)

{

String comd[] = args;

if(comd.length == 0)

{

System.out.println("Use localhost(127.0.0.1) and default port");

ClientSocketDemo demo = new ClientSocketDemo();

}

else if(comd.length == 1)

{

System.out.println("Use default port");

ClientSocketDemo demo = new ClientSocketDemo(args[0]);

}

else if(comd.length == 2)

{

System.out.println("Hostname and port are named by user");

ClientSocketDemo demo = new ClientSocketDemo(args[0],args[1]);

}

else System.out.println("ERROR");

}

}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

【ServerSocketDemo.java 服務(wù)器端Java源代碼】

import java.net.*;

import java.io.*;

public class ServerSocketDemo

{

//聲明ServerSocket類對(duì)象

ServerSocket serverSocket;

//聲明并初始化服務(wù)器端監(jiān)聽(tīng)端口號(hào)常量

public static final int PORT = 10745;

//聲明服務(wù)器端數(shù)據(jù)輸入輸出流

DataInputStream in;

DataOutputStream out;

//聲明InetAddress類對(duì)象ip，用于獲取服務(wù)器地址及端口號(hào)等信息

InetAddress ip = null;

//聲明字符串?dāng)?shù)組對(duì)象request，用于存儲(chǔ)從客戶端發(fā)送來(lái)的信息

String request[];

public ServerSocketDemo()

{

request = new String[3]; //初始化字符串?dāng)?shù)組

try

{

//獲取本地服務(wù)器地址信息

ip = InetAddress.getLocalHost();

//以PORT為服務(wù)端口號(hào)，創(chuàng)建serverSocket對(duì)象以監(jiān)聽(tīng)該端口上的連接

serverSocket = new ServerSocket(PORT);

//創(chuàng)建Socket類的對(duì)象socket，用于保存連接到服務(wù)器的客戶端socket對(duì)象

Socket socket = serverSocket.accept();

System.out.println("This is server:"+String.valueOf(ip)+PORT);

//創(chuàng)建服務(wù)器端數(shù)據(jù)輸入輸出流，用于對(duì)客戶端接收或發(fā)送數(shù)據(jù)

in = new DataInputStream(socket.getInputStream());

out = new DataOutputStream(socket.getOutputStream());

//接收客戶端發(fā)送來(lái)的數(shù)據(jù)信息，并顯示

request[0] = in.readUTF();

request[1] = in.readUTF();

request[2] = in.readUTF();

System.out.println("Received messages form client is:");

System.out.println(request[0]);

System.out.println(request[1]);

System.out.println(request[2]);

//向客戶端發(fā)送數(shù)據(jù)

out.writeUTF("Hello client!");

out.writeUTF("Your ip is:"+request[1]);

out.writeUTF("Your port is:"+request[2]);

}

catch(IOException e){e.printStackTrace();}

}

public static void main(String[] args)

{

ServerSocketDemo demo = new ServerSocketDemo();

}

}

java中如何根據(jù)一個(gè)網(wǎng)址獲得該網(wǎng)頁(yè)的源代碼？

package test;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

public class HttpTest {

private String u;

private String encoding;

public static void main(String[] args) throws Exception {

HttpTest client = new HttpTest("", "UTF-8");

client.run();

}

public HttpTest(String u, String encoding) {

this.u = u;

this.encoding = encoding;

}

public void run() throws Exception {

URL url = new URL(u);// 根據(jù)鏈接（字符串格式），生成一個(gè)URL對(duì)象

HttpURLConnection urlConnection = (HttpURLConnection) url

.openConnection();// 打開(kāi)URL

BufferedReader reader = new BufferedReader(new InputStreamReader(

urlConnection.getInputStream(), encoding));// 得到輸入流，即獲得了網(wǎng)頁(yè)的內(nèi)容

String line; // 讀取輸入流的數(shù)據(jù)，并顯示

while ((line = reader.readLine()) != null) {

System.out.println(line);

}

}

}

根據(jù)具體問(wèn)題類型，進(jìn)行步驟拆解／原因原理分析／內(nèi)容拓展等。

具體步驟如下：／導(dǎo)致這種情況的原因主要是……

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