java后台获取html的内容详解。

java获取html文件内容


package com;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
*
* @author 晓峰2007.1.18 抓取雅虎知识堂的文章标题及内容（测试） 手动输入网址抓取，可进一步自动抓取整个知识堂的全部内容
*
*/
public class Test
{
/**
* 读取一个网页全部内容
*/
public String getOneHtml(final String htmlurl) throws IOException
{
URL url;
String temp;
final StringBuffer sb = new StringBuffer();
try
{
   url = new URL(htmlurl);
   final BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), "utf-8"));// 读取网页全部内容
   while ((temp = in.readLine()) != null)
   {
    sb.append(temp);
   }
   in.close();
}
catch (final MalformedURLException me)
{
   System.out.println("你输入的URL格式有问题！请仔细输入");
   me.getMessage();
   throw me;
}
catch (final IOException e)
{
   e.printStackTrace();
   throw e;
}
return sb.toString();
}

/**
*
* @param s
* @return 获得网页标题
*/
public String getTitle(final String s)
{
String regex;
String title = "";
final List<String> list = new ArrayList<String>();
regex = "<title>.*?</title>";
final Pattern pa = Pattern.compile(regex, Pattern.CANON_EQ);
final Matcher ma = pa.matcher(s);
while (ma.find())
{
   list.add(ma.group());
}
for (int i = 0; i < list.size(); i++)
{
   title = title + list.get(i);
}
return outTag(title);
}

/**
*
* @param s
* @return 获得链接
*/
public List<String> getLink(final String s)
{
String regex;
final List<String> list = new ArrayList<String>();
regex = "<a[^>]*href=(\"([^\"]*)\"|\'([^\']*)\'|([^\\s>]*))[^>]*>(.*?)</a>";
final Pattern pa = Pattern.compile(regex, Pattern.DOTALL);
final Matcher ma = pa.matcher(s);
while (ma.find())
{
   list.add(ma.group());
}
return list;
}

/**
*
* @param s
* @return 获得脚本代码
*/
public List<String> getScript(final String s)
{
String regex;
final List<String> list = new ArrayList<String>();
regex = "<SCRIPT.*?</SCRIPT>";
final Pattern pa = Pattern.compile(regex, Pattern.DOTALL);
final Matcher ma = pa.matcher(s);
while (ma.find())
{
   list.add(ma.group());
}
return list;
}
public List<String> getNews(String s){
    String regex = "<a.*?</a>";
    Pattern pa = Pattern.compile(regex, Pattern.DOTALL);
    Matcher ma = pa.matcher(s);
    List<String> list = new ArrayList<String>();
    while (ma.find())
    {
       list.add(ma.group());

    }
    return list;
}
/**
*
* @param s
* @return 获得CSS
*/
public List<String> getCSS(final String s)
{
String regex;
final List<String> list = new ArrayList<String>();
regex = "<style.*?</style>";
final Pattern pa = Pattern.compile(regex, Pattern.DOTALL);
final Matcher ma = pa.matcher(s);
while (ma.find())
{
   list.add(ma.group());
}
return list;
}

/**
*
* @param s
* @return 去掉标记
*/
public String outTag(final String s)
{
return s.replaceAll("<.*?>", "");
}

/**
*
* @param s
* @return 获取雅虎知识堂文章标题及内容
*/
public HashMap<String, String> getFromYahoo(final String s)
{
final HashMap<String, String> hm = new HashMap<String, String>();
final StringBuffer sb = new StringBuffer();
String html = "";
System.out.println("\n------------------开始读取网页(" + s + ")--------------------");
try
{
   html = getOneHtml(s);
}
catch (final Exception e)
{
   e.getMessage();
}
// System.out.println(html);
System.out.println("------------------读取网页(" + s + ")结束--------------------\n");
System.out.println("------------------分析(" + s + ")结果如下--------------------\n");
String title = outTag(getTitle(html));
title = title.replaceAll("_雅虎知识堂", "");
// Pattern pa=Pattern.compile("<div
// class=\"original\">(.*?)((\r\n)*)(.*?)((\r\n)*)(.*?)</div>",Pattern.DOTALL);
final Pattern pa = Pattern.compile("<div class=\"original\">(.*?)</p></div>", Pattern.DOTALL);
final Matcher ma = pa.matcher(html);
while (ma.find())
{
   sb.append(ma.group());
}
String temp = sb.toString();
temp = temp.replaceAll("(<br>)+?", "\n");// 转化换行
temp = temp.replaceAll("<p><em>.*?</em></p>", "");// 去图片注释
hm.put("title", title);
hm.put("original", outTag(temp));
return hm;

}

public static void main(String[] args) throws IOException {
    Test t = new Test();
    String js = t.getOneHtml("http://www.gzhu.edu.cn/js/gzunews.js");
    System.out.println(t.getOneHtml("http://www.gzhu.edu.cn/js/gzunews.js"));
    List<String> a = t.getNews(js);
    List<String> news = new ArrayList<String>();
    for(String s: a){
        news.add(s.replaceAll("<.*?>", ""));
    }
    System.out.println(news);
}
}

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