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java下載網(wǎng)頁源代碼 java 網(wǎng)頁下載

java中如何根據(jù)一個網(wǎng)址獲得該網(wǎng)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(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(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)具體問題類型，進行步驟拆解／原因原理分析／內(nèi)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(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。

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}

設計一個JAVA程序，下載由URL指定的網(wǎng)頁的源代碼，找出其中所有的超鏈接。

import?java.awt.BorderLayout;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?java.io.BufferedReader;

import?java.io.IOException;

import?java.io.InputStream;

import?java.io.InputStreamReader;

import?java.net.HttpURLConnection;

import?java.net.MalformedURLException;

import?java.net.URL;

import?java.util.regex.Matcher;

import?java.util.regex.Pattern;

import?javax.swing.JFrame;

import?javax.swing.JLabel;

import?javax.swing.JPanel;

import?javax.swing.JScrollPane;

import?javax.swing.JTextArea;

import?javax.swing.JTextField;

public?class?HttpViewer?extends?JFrame?{

private?JTextField?urlInput;

private?JTextArea?viewArea;

public?static?void?main(String[]?args)?{

new?HttpViewer();

}

public?HttpViewer()?{

this.setTitle("Http?Viewer");

this.setSize(800,?600);

this.setResizable(false);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

initPanel();

initAction();

this.setVisible(true);

}

//?這個方法用來設置窗口布局

private?void?initPanel()?{

JPanel?northPanel?=?new?JPanel();

JLabel?urlInputLabel?=?new?JLabel("URL:");

urlInput?=?new?JTextField(60);

northPanel.add(urlInputLabel);

northPanel.add(urlInput);

this.add(northPanel,?BorderLayout.NORTH);

JPanel?centerPanel?=?new?JPanel();

viewArea?=?new?JTextArea(27,?60);

centerPanel.add(new?JScrollPane(viewArea));

this.add(centerPanel);

}

//?這個方法用來設置事件

private?void?initAction()?{

urlInput.addActionListener(new?ActionListener()?{

public?void?actionPerformed(ActionEvent?e)?{

String?text?=?urlInput.getText();

if?(text?==?null?||?text.length()?==?0)?{

viewArea.setText("您沒有輸入URL");

return;

}

try?{

URL?url?=?new?URL(text);

String?context?=?getContent(url);

if?(context?!=?null)?{

searchFromText(context);

}

}?catch?(MalformedURLException?e1)?{

viewArea.setText("您輸入的URL不合法:"?+?text);

}

}

});

}

private?String?getContent(URL?url)?{

StringBuffer?builder?=?new?StringBuffer();

int?responseCode?=?-1;

HttpURLConnection?con?=?null;

try?{

con?=?(HttpURLConnection)?url.openConnection();

con.setRequestProperty("User-Agent",

"Mozilla/4.0?(compatible;?MSIE?5.0;?Windows?NT;?DigExt)");//?IE代理進行下載

con.setConnectTimeout(60000);

con.setReadTimeout(60000);

//?獲得網(wǎng)頁返回信息碼

responseCode?=?con.getResponseCode();

if?(responseCode?==?-1)?{

viewArea.setText("連接失敗:"?+?url.toString());

return?null;

}

if?(responseCode?=?400)?{

viewArea.setText("請求失敗，錯誤碼:"?+?responseCode);

return?null;

}

InputStream?is?=?con.getInputStream();

InputStreamReader?isr?=?new?InputStreamReader(is);

BufferedReader?br?=?new?BufferedReader(isr);

String?str?=?null;

while?((str?=?br.readLine())?!=?null)

builder.append(str);

is.close();

}?catch?(IOException?e)?{

e.printStackTrace();

viewArea.setText("IOException:?"?+?url.toString());

}?finally?{

con.disconnect();

}

return?builder.toString();

}

private?void?searchFromText(String?context)?{

viewArea.setText("查找URL中：\n");

Pattern?pattern?=?Pattern.compile("a(?[^]+)*(.*?)/a");

Matcher?matcher?=?pattern.matcher(context);

while?(matcher.find())?{

for?(String?prop?:?matcher.group(1).split("?"))?{

int?indexOf?=?prop.indexOf('=');

if?(indexOf??0)?{

if?(prop.substring(0,?indexOf).equals("href"))?{

String?url2?=?prop.substring(indexOf?+?2,?prop.length()?-?1);

viewArea.append(url2?+?"\n");

}

}

}

}

}

}

求一個Java實現(xiàn)自動下載的源代碼

您好，這樣的：

/**

*

*/

package com.b510.base.bean.install;

import java.io.File;

import java.io.FileWriter;

import java.text.SimpleDateFormat;

import java.util.Date;

/**

* @author hongten(hongtenzone@foxmail.com)

* @date 2013-2-24

*/

@SuppressWarnings("unchecked")

public class BeanUtils {

//公共部分

private static final String RT_1 = "\r\n";

private static final String RT_2 = RT_1+RT_1;

private static final String BLANK_1 =" ";

private static final String BLANK_4 =" ";

private static final String BLANK_8 =BLANK_4 + BLANK_4;

//注釋部分

private static final String ANNOTATION_AUTHOR_PARAMTER = "@author ";

private static final String ANNOTATION_AUTHOR_NAME = "hongten(hongtenzone@foxmail.com)";

private static final String ANNOTATION_AUTHOR = ANNOTATION_AUTHOR_PARAMTER + ANNOTATION_AUTHOR_NAME;

private static final String ANNOTATION_DATE = "@date ";

private static final String ANNOTATION = "/**"+RT_1+BLANK_1+"*"+BLANK_1+ANNOTATION_AUTHOR +RT_1+BLANK_1+"*"+BLANK_1+ANNOTATION_DATE +getDate()+RT_1+BLANK_1+"*/"+RT_1;

//文件 地址

//private static final String BEAN_PATH = "com/b510/base/bean";

private static final String DAO_PATH = "com/b510/base/dao";

private static final String DAO_IMPL_PATH = "com/b510/base/dao/impl";

private static final String SERVICE_PATH = "com/b510/base/service";

private static final String SERVICE_IMPL_PATH = "com/b510/base/service/impl";

//包名

private static final String BEAN_URL = "com.b510.base.bean";

private static final String DAO_URL = "com.b510.base.dao";

private static final String DAO_IMPL_URL = "com.b510.base.dao.impl";

private static final String SERVICE_URL = "com.b510.base.service";

private static final String SERVICE_IMPL_URL = "com.b510.base.service.impl";

//基本類名稱

private static final String BASE_DAO_NAME = DAO_URL + ".BaseDao";

private static final String ABSTRACT_BASE_DAO_IMPL_NAME = DAO_IMPL_URL + ".AbstractBaseDaoImpl";

private static final String BASE_SERVICE_NAME = SERVICE_URL + ".BaseService";

private static final String ABSTRACT_BASE_SERVICE_IMPL_NAME = SERVICE_IMPL_URL + ".AbstractBaseServiceImpl";

/**

* 創(chuàng)建bean的Daobr

*

* @param c

* @throws Exception

*/

public void createBeanDao(Class c) throws Exception {

String cName = c.getName();

String fileName = System.getProperty("user.dir") + "/src/" + DAO_PATH

+ "/" + getLastChar(cName) + "Dao.java";

File f = new File(fileName);

FileWriter fw = new FileWriter(f);

fw.write("package "+DAO_URL+";"+RT_2+ANNOTATION+"public interface " +

getLastChar(cName) + "Dao extends "+BASE_DAO_NAME+" " + cName + " {"+RT_2+"}");

fw.flush();

fw.close();

showInfo(fileName);

}

/**

* 創(chuàng)建bean的Dao的實現(xiàn)類

* @param c

* @throws Exception

*/

public void createBeanDaoImpl(Class c) throws Exception{

String cName = c.getName();

String fileName = System.getProperty("user.dir") + "/src/" + DAO_IMPL_PATH

+ "/" + getLastChar(cName) + "DaoImpl.java";

File f = new File(fileName);

FileWriter fw = new FileWriter(f);

fw.write("package "+DAO_IMPL_URL+";"+RT_2+ANNOTATION+"public class " +

getLastChar(cName) + "DaoImpl extends "+ABSTRACT_BASE_DAO_IMPL_NAME+"" +

cName + " implements "+DAO_URL+"."+getLastChar(cName)+"Dao{"+RT_2+"}");

fw.flush();

fw.close();

showInfo(fileName);

}

/**

* 創(chuàng)建bean的service

* @param c

* @throws Exception

*/

public void createBeanService(Class c) throws Exception{

String cName = c.getName();

String fileName = System.getProperty("user.dir") + "/src/" + SERVICE_PATH

+ "/" + getLastChar(cName) + "Service.java";

File f = new File(fileName);

FileWriter fw = new FileWriter(f);

fw.write("package "+SERVICE_URL+";"+RT_2+ANNOTATION+"public interface " +

getLastChar(cName) + "Service extends "+BASE_SERVICE_NAME+""+ cName +"{"+RT_2+"}");

fw.flush();

fw.close();

showInfo(fileName);

}

/**

* 創(chuàng)建bean的service的實現(xiàn)類

* @param c

* @throws Exception

*/

public void createBeanServiceImpl(Class c) throws Exception{

String cName = c.getName();

String fileName = System.getProperty("user.dir") + "/src/" + SERVICE_IMPL_PATH

+ "/" +getLastChar(cName)+"ServiceImpl.java";

File f = new File(fileName);

FileWriter fw = new FileWriter(f);

fw.write("package "+SERVICE_IMPL_URL+";"+RT_2+ANNOTATION+"public class "

+ getLastChar(cName) + "ServiceImpl extends "+ABSTRACT_BASE_SERVICE_IMPL_NAME+""+ cName

+ " implements "+SERVICE_URL+"."+getLastChar(cName)+"Service{"+RT_2+BLANK_4

+"private "+DAO_URL+"."+getLastChar(cName)+"Dao "+getLowercaseChar(getLastChar(cName))

+"Dao;"+RT_2+BLANK_4+"public void set"+getLastChar(cName)+"Dao("+DAO_URL+"."+getLastChar(cName)+"Dao "

+getLowercaseChar(getLastChar(cName))+"Dao){"+RT_1+BLANK_8+"this."+getLowercaseChar(getLastChar(cName))+"Dao = "

+getLowercaseChar(getLastChar(cName))+"Dao;"+RT_1+BLANK_4+"}"+RT_2+BLANK_4+"@Override"+RT_1+BLANK_4

+"public "+DAO_URL+"."+"BaseDao"+BEAN_URL+"."+getLastChar(cName)+" getBaseDao(){"+RT_1+BLANK_8

+"return "+getLowercaseChar(getLastChar(cName))+"Dao;"+RT_1+BLANK_4+"}"+RT_2+"}");

fw.flush();

fw.close();

showInfo(fileName);

}

/**

* 獲取路徑的最后面字符串br

* 如：br

* codestr = "com.b510.base.bean.User"/codebr

* code return "User";code

* @param str

* @return

*/

public String getLastChar(String str) {

if ((str != null) (str.length() 0)) {

int dot = str.lastIndexOf('.');

if ((dot -1) (dot (str.length() - 1))) {

return str.substring(dot + 1);

}

}

return str;

}

/**

* 把第一個字母變?yōu)樾慴r

* 如：br

* codestr = "UserDao";/codebr

* codereturn "userDao";/code

* @param str

* @return

*/

public String getLowercaseChar(String str){

return str.substring(0,1).toLowerCase()+str.substring(1);

}

/**

* 顯示信息

* @param info

*/

public void showInfo(String info){

System.out.println("創(chuàng)建文件："+ info+ "成功！");

}

/**

* 獲取系統(tǒng)時間

* @return

*/

public static String getDate(){

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");

return simpleDateFormat.format(new Date());

}

}


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