html分析器——jericho-html-3.3分解table

谢和颂

2023-12-01

原部分来自Internet上的其他博客，只是因为很长一段时间。忘了谁是参考，这里说声抱歉。。

先贴一些html页：

<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=GBK">
<title>HTML Parser</title>
<meta name="generator" content="Namo WebEditor">
</head>
<body>
<table width=620 border=0 cellpadding=1 cellspacing=0 bgcolor=#0066cc>
	<tr>
		<td width=100%>
		<table width=100% border=0 cellpadding=4 cellspacing=0 bgcolor=#D3E5FB>
			<tr bgcolor=#D3E5FB>
				<td width=20%><font size="2" face="Arial,Verdana"><b>想学习
				Name</b></font><br>
				</td>
				<td width=13%><font size="2" face="Arial,Verdana"><b>Result</b></font><br>
				</td>
				<td width=8%><font size="2" face="Arial,Verdana"><b>Time</b></font><br>
				</td>
				<td width=59%><font size="2" face="Arial,Verdana"><b>Synopsis</b></font><br>
				</td>
			</tr>
			<tr bgcolor=#eeeeee>
				<td width=20%><font size="1" face="Arial,Verdana"><b>9</b>
				想学习</font><br>
				</td>
				<td width=13%><font size="1" face="Arial,Verdana"><font
					color=#ff0033>+FAIL</font> <a
					href="v4_wireless_802.1x_full/cdrouter_dhcp_20.txt">想学习</a></font><br>
				</td>
				<td width=8%><font size="1" face="Arial,Verdana">12:31</font><br>
				</td>
				<td width=59%><font size="1" face="Arial,Verdana">想学习</font><br>
				</td>
			</tr>
			<tr bgcolor=#ffffff>
				<td width=20%><font size="1" face="Arial,Verdana"><b>1</b>
				cdrouter_basic_1</font><br>
				</td>
				<td width=13%><font size="1" face="Arial,Verdana">Pass <a
					href="v4_wireless_802.1x_full/cdrouter_basic_1.txt">想学习</a></font><br>
				</td>
				<td width=8%><font size="1" face="Arial,Verdana">00:00</font><br>
				</td>
				<td width=59%><font size="1" face="Arial,Verdana">想学习</font><br>
				</td>
			</tr>
		</table>
		</td>
	</tr>
</table>
</body>
</html>

对于这个页面来说我想取出全部的td里面的文字内容，该怎么办呢。假设用正則表達式，我还真是难以写出正确的，来解析出我所要的结果。

在网上搜索了一下jericho-html-3.3这个插件，用来解析table。的确非常方便。

代码例如以下：

package com.xxx.hbuassys.test;

import java.net.URL;
import java.util.Iterator;
import java.util.List;

import net.htmlparser.jericho.Element;
import net.htmlparser.jericho.HTMLElementName;
import net.htmlparser.jericho.Segment;
import net.htmlparser.jericho.Source;
 
public class HtmlParser
{
    public static void main(String[] args) throws Exception
    {
        String sourceUrlString="test.html";
        
        if(sourceUrlString.indexOf(':') == -1)
            sourceUrlString ="file:"+sourceUrlString;
        Source source=new Source(new URL(sourceUrlString));
        List Elements_TABLE=source.getAllElements(HTMLElementName.TABLE);
        Elements_TABLE.remove(0);//因为table相互嵌套。我们须要的是第二个，所以删掉第一个
        Iterator it_TABLE = Elements_TABLE.iterator();
        while(it_TABLE.hasNext())
        {
            Element Element_TABLE = (Element)it_TABLE.next();
//        	System.out.println("**"+Element_TABLE.toString()+"\n**");
            Segment getContent_TABLE = (Segment)Element_TABLE.getContent();
            List Elements_TR = getContent_TABLE.getAllElements(HTMLElementName.TR);
            Iterator it_TR = Elements_TR.iterator();
            while(it_TR.hasNext())
            {
                Element Element_TR = (Element)it_TR.next();
                Segment getContent_TR = (Segment)Element_TR.getContent();
                List Elements_FONT = getContent_TR.getAllElements(HTMLElementName.FONT);
                Iterator it_FONT = Elements_FONT.iterator();
                int i = 1;
                while(it_FONT.hasNext())
                {
                    Element Element_FONT = (Element)it_FONT.next();
                    Segment getContent_FONT = (Segment)Element_FONT.getContent();
                    String a1 = getContent_FONT.toString();
                    System.out.println(i + " = " + Element_FONT.getContent().getTextExtractor().toString());
                    i++;
                }
                System.out.println();
            }
        }
    }
}

结果：

1 = 想学习 Name
2 = Result
3 = Time
4 = Synopsis

1 = 9 想学习
2 = +FAIL 想学习
3 = +FAIL
4 = 12:31
5 = 想学习

1 = 1 cdrouter_basic_1
2 = Pass 想学习
3 = 00:00
4 = 想学习

大致的思路就是，先取出全部的table标签，然后对须要的table进行解析，取出里面的tr,在从tr里面取出td这样就能够得到我们须要的内容了。

假设仅仅讲到这，那么就跟网上其它人讲的没有什么差别了。

由于项目的须要，使用此插件发现了一个问题：

假设html页面的编码是UTF-8的格式，那么解析出来的内容就会是乱码。假设直接对这些乱码编码。採用new String(str.getBytes(),"GBK");等之类的操作都不能解决这个问题。本人亲自測试过。

比如html页面变为：

<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8">
<title>HTML Parser</title>
<meta name="generator" content="Namo WebEditor">
</head>
<body>
<table width=620 border=0 cellpadding=1 cellspacing=0 bgcolor=#0066cc>
	<tr>
		<td width=100%>
		<table width=100% border=0 cellpadding=4 cellspacing=0 bgcolor=#D3E5FB>
			<tr bgcolor=#D3E5FB>
				<td width=20%><font size="2" face="Arial,Verdana"><b>想学习
				Name</b></font><br>
				</td>
				<td width=13%><font size="2" face="Arial,Verdana"><b>Result</b></font><br>
				</td>
				<td width=8%><font size="2" face="Arial,Verdana"><b>Time</b></font><br>
				</td>
				<td width=59%><font size="2" face="Arial,Verdana"><b>Synopsis</b></font><br>
				</td>
			</tr>
			<tr bgcolor=#eeeeee>
				<td width=20%><font size="1" face="Arial,Verdana"><b>9</b>
				想学习</font><br>
				</td>
				<td width=13%><font size="1" face="Arial,Verdana"><font
					color=#ff0033>+FAIL</font> <a
					href="v4_wireless_802.1x_full/cdrouter_dhcp_20.txt">想学习</a></font><br>
				</td>
				<td width=8%><font size="1" face="Arial,Verdana">12:31</font><br>
				</td>
				<td width=59%><font size="1" face="Arial,Verdana">想学习</font><br>
				</td>
			</tr>
			<tr bgcolor=#ffffff>
				<td width=20%><font size="1" face="Arial,Verdana"><b>1</b>
				cdrouter_basic_1</font><br>
				</td>
				<td width=13%><font size="1" face="Arial,Verdana">Pass <a
					href="v4_wireless_802.1x_full/cdrouter_basic_1.txt">想学习</a></font><br>
				</td>
				<td width=8%><font size="1" face="Arial,Verdana">00:00</font><br>
				</td>
				<td width=59%><font size="1" face="Arial,Verdana">想学习</font><br>
				</td>
			</tr>
		</table>
		</td>
	</tr>
</table>
</body>
</html>

得到的结果是：

1 = ???

? Name
2 = Result
3 = Time
4 = Synopsis

1 = 9 ???

?
2 = +FAIL ?

???
3 = +FAIL
4 = 12:31
5 = ?

??

1 = 1 cdrouter_basic_1
2 = Pass ??

??
3 = 00:00
4 = ?

採用的方法是：改变<meta http-equiv="content-type" content="text/html;charset=UTF-8">变为：<meta http-equiv="content-type" content="text/html;charset=GBK">

具体情况，參考代码例如以下：

package com.xxx.hbuassys.test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Iterator;
import java.util.List;

import net.htmlparser.jericho.Element;
import net.htmlparser.jericho.HTMLElementName;
import net.htmlparser.jericho.Segment;
import net.htmlparser.jericho.Source;
 
public class HtmlParser
{
    public static void main(String[] args) throws Exception
    {
    	BufferedReader reader=new BufferedReader(new InputStreamReader(new FileInputStream(new File("test.html"))));
//    	BufferedReader reader=new BufferedReader(new FileReader(new File("test.html")));
    	StringBuilder sbf=new StringBuilder();
    	String str=null;
    	while((str=reader.readLine())!=null){
    		sbf.append(str).append("\n");
    	}
    	//解决中文乱码的方法
    	String html=sbf.toString().replace("<meta http-equiv=\"content-type\" content=\"text/html;charset=UTF-8\">", "<meta http-equiv=\"content-type\" content=\"text/html;charset=GBK\">");
//    	System.out.println(html);
        Source source=new Source(html);
        List Elements_TABLE=source.getAllElements(HTMLElementName.TABLE);
        Elements_TABLE.remove(0);//因为table相互嵌套，我们须要的是第二个，所以删掉第一个
        Iterator it_TABLE = Elements_TABLE.iterator();
        while(it_TABLE.hasNext())
        {
            Element Element_TABLE = (Element)it_TABLE.next();
//        	System.out.println("**"+Element_TABLE.toString()+"\n**");
            Segment getContent_TABLE = (Segment)Element_TABLE.getContent();
            List Elements_TR = getContent_TABLE.getAllElements(HTMLElementName.TR);
            Iterator it_TR = Elements_TR.iterator();
            while(it_TR.hasNext())
            {
                Element Element_TR = (Element)it_TR.next();
                Segment getContent_TR = (Segment)Element_TR.getContent();
                List Elements_FONT = getContent_TR.getAllElements(HTMLElementName.FONT);
                Iterator it_FONT = Elements_FONT.iterator();
                int i = 1;
                while(it_FONT.hasNext())
                {
                    Element Element_FONT = (Element)it_FONT.next();
                    Segment getContent_FONT = (Segment)Element_FONT.getContent();
                    String a1 = getContent_FONT.toString();
                    System.out.println(i + " = " + Element_FONT.getContent().getTextExtractor().toString());
                    i++;
                }
                System.out.println();
            }
        }
    }
}

结果例如以下：

1 = 想学习 Name
2 = Result
3 = Time
4 = Synopsis

1 = 9 想学习
2 = +FAIL 想学习
3 = +FAIL
4 = 12:31
5 = 想学习

1 = 1 cdrouter_basic_1
2 = Pass 想学习
3 = 00:00
4 = 想学习

html分析器——jericho-html-3.3分解table

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