Java訪問指定URL并獲取網(wǎng)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(shù)中獲取URL，通過輸入緩沖和輸出緩沖將該URL 原碼輸出。

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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(jù)一個網(wǎng)址獲得該網(wǎng)頁的源代碼？

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(wǎng)頁的內容

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中如何根據(jù)一個網(wǎng)址獲得該網(wǎng)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(wǎng)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(wǎng)頁的內容

BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection

.getInputStream()));

String line;

// 讀取輸入流的數(shù)據(jù)，并顯示

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

System.out.println(line);

}

}

}

怎樣使用java讀取網(wǎng)頁源碼 How To Get URL Content In Java

使用java讀取網(wǎng)頁源碼 How To Get URL Content In Java

public class GetURLContent {

public static void main(String[] args) {

URL url;

try {

// get URL content

url = new URL("");

URLConnection conn = url.openConnection();

// open the stream and put it into BufferedReader

BufferedReader br = new BufferedReader(

new InputStreamReader(conn.getInputStream()));

String inputLine;

//save to this filename

String fileName = "/users/mkyong/test.html";

File file = new File(fileName);

if (!file.exists()) {

file.createNewFile();

}

//use FileWriter to write file

FileWriter fw = new FileWriter(file.getAbsoluteFile());

BufferedWriter bw = new BufferedWriter(fw);

while ((inputLine = br.readLine()) != null) {

bw.write(inputLine);

}

bw.close();

br.close();

System.out.println("Done");

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}