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;

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import java.io.BufferedReader;

import java.io.InputStreamReader;

import java點(diǎn)虐 .HttpURLConnection;

import java點(diǎn)虐 .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……

java程序讀取一個(gè)url頁(yè)面的源代碼

傳入一個(gè)url，返回源代碼； public static String getHTML(String url){// 獲取指定URL的網(wǎng)頁(yè)，返回網(wǎng)頁(yè)內(nèi)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; }

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。

2．編寫(xiě)useSourceViewer 類，代碼如下：

import java點(diǎn)虐 .*;

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}