java中如何根據一個網址獲得該網頁的源代碼？

package test;

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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);// 根據鏈接（字符串格式），生成一個URL對象

HttpURLConnection urlConnection = (HttpURLConnection) url

.openConnection();// 打開URL

BufferedReader reader = new BufferedReader(new InputStreamReader(

urlConnection.getInputStream(), encoding));// 得到輸入流，即獲得了網頁的內容

String line; // 讀取輸入流的數據，并顯示

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

System.out.println(line);

}

}

}

根據具體問題類型，進行步驟拆解／原因原理分析／內容拓展等。

具體步驟如下：／導致這種情況的原因主要是……

Java訪問指定URL并獲取網頁源代碼

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

2．編寫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URL

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

InputStream in = u.openStream( );

// 為增加性能存儲輸入流

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中如何根據一個網址獲得該網頁的源代碼，急求

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

public class HttpTest {

String urlString;

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

HttpTest client = new HttpTest(網址);

client.run();

}

public HttpTest(String urlString) {

this.urlString = urlString;

}

public void run() throws Exception {

//生成一個URL對象

URL url = new URL(urlString);

//打開URL

HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

//得到輸入流，即獲得了網頁的內容

BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection

.getInputStream()));

String line;

// 讀取輸入流的數據，并顯示

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

System.out.println(line);

}

}

}

java程序讀取一個url頁面的源代碼

傳入一個url，返回源代碼； public static String getHTML(String url){// 獲取指定URL的網頁，返回網頁內容的字符串，然后將此字符串存到文件即可 try { URL newUrl = new URL(url); URLConnection connect = newUrl.openConnection(); connect.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)"); DataInputStream dis = new DataInputStream(connect.getInputStream()); BufferedReader in = new BufferedReader(new InputStreamReader(dis,"UTF-8")); String html = ""; String readLine = null; while((readLine = in.readLine()) != null) { html = html + readLine; } in.close(); return html; }catch (MalformedURLException me){ System.out.println("MalformedURLException" + me); }catch (IOException ioe){ System.out.println("ioeException" + ioe); } return null; }