字符串处理的问题？

Question

thanks,to  lengshuangzi(冷霜子),
取出每一对r的信息.to yoken(雨泉) ,
xpath怎么做，能写一下代码么？

Answer 1

<sample>
<r>
    <xx>ddd</xx>
</r>
<c>
    <p name="5">erw</>
</c>
<r>trter
    <aa>
        <r>ff</r>
    </aa>
</r>
</sample>取ddd : sample/r/xx/text()
取erw : sample/c/p/text()
取trter : sample/r/text()
取ff : sample/r/aa/r/text()

Answer 2

to yoken(雨泉) ,
你这是不行的，你不能动态获取。

Answer 3

以 <r> 和 </r> 为一对，如果有嵌套就用压栈来实现吧.

Answer 4

to yoken(雨泉) 说的是dom

Answer 5

多谢，
to topsonstar(星),
能不能详细一点，不太明白。

Answer 6

package com.test.csdn.xml;public class TestParseXml
{
    private static String tag;
    class MyHandler
        extends org.xml.sax.helpers.DefaultHandler
    {
        private String part = null;
        public void startElement(String uri, String localName, String qName,
                                 org.xml.sax.Attributes attributes)
        {
            if (qName.equals(tag))
            {
                part = "<" + tag + ">";
//                part="";
            }
            else if (part != null)
            {
                part += "<" + qName + ">";
            }
        }
        public void endElement(String uri, String localName, String qName)
        {
            if (qName.equals(tag))
            {
                part += "</" + tag + ">";
                System.out.println(part);
            }
            else
            {
                part += "</" + qName + ">";
            }
        }
        public void characters(char[] ch, int start, int length)
        {
            part += new String(ch, start, length);
        }
    }
    public static void setFilterTag(String tag)
    {
        TestParseXml.tag = tag;
    }    public static java.io.InputStream getXmlStream()
    {
        String xml = "<root><r><xx>ddd</xx></r><c><p name=\"5\">erw</p></c><r>trter</r><aa><r>ff</r></aa></root>";
        setFilterTag("r");
        return new java.io.ByteArrayInputStream(xml.getBytes());
    }
    public static void main(String[] args) throws Exception
    {
        javax.xml.parsers.SAXParserFactory saxParserFtr =
            javax.xml.parsers.SAXParserFactory.newInstance();
        javax.xml.parsers.SAXParser parser = saxParserFtr.newSAXParser();
        java.io.InputStream is = getXmlStream();
        parser.parse(new org.xml.sax.InputSource(is),
                     new TestParseXml().new MyHandler());
    }
}

Answer 7

详细说明见：
http://expert.csdn.net/Expert/topic/1987/1987765.xml?temp=.9690363

Answer 8

package com.test.csdn.xml;public class TestParseXml
{
    private static String tag;
    class MyHandler
        extends org.xml.sax.helpers.DefaultHandler
    {
        private String part = null;
        private String getAttr(org.xml.sax.Attributes t)
        {
            String s="";
            for(int i=0;i<t.getLength();i++)
            {
                s=s+" " +t.getQName(i) +"=\""+ t.getValue(i)+"\"";
            }
            return s;
        }        public void startElement(String uri, String localName, String qName,
                                 org.xml.sax.Attributes attributes)
        {
            if (qName.equals(tag))
            {
                part = "<" + tag + getAttr(attributes)+ ">";
//                part="";
            }
            else if (part != null)
            {
                part += "<" + qName + getAttr(attributes) + ">";
            }
        }
        public void endElement(String uri, String localName, String qName)
        {
            if (qName.equals(tag))
            {
                part += "</" + tag + ">";
                System.out.println(part);
            }
            else
            {
                part += "</" + qName + ">";
            }
        }
        public void characters(char[] ch, int start, int length)
        {
            part += new String(ch, start, length);
        }
    }
    public static void setFilterTag(String tag)
    {
        TestParseXml.tag = tag;
    }    public static java.io.InputStream getXmlStream()
    {
        String xml = "<root><r><xx test=\"hello!\">ddd</xx></r><c><p name=\"5\">erw</p></c><r>trter</r><aa><r>ff</r></aa></root>";
        setFilterTag("r");
        return new java.io.ByteArrayInputStream(xml.getBytes());
    }
    public static void main(String[] args) throws Exception
    {
        javax.xml.parsers.SAXParserFactory saxParserFtr =
            javax.xml.parsers.SAXParserFactory.newInstance();
        javax.xml.parsers.SAXParser parser = saxParserFtr.newSAXParser();
        java.io.InputStream is = getXmlStream();
        parser.parse(new org.xml.sax.InputSource(is),
                     new TestParseXml().new MyHandler());
    }
}