java解析String类型t复杂xml，多级节点，最好的例子

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需要用jar包 dom4j-1.6.1.jar

字符串xml如下：

解析代码：

import java.io.ByteArrayInputStream;
import java.io.UnsupportedEncodingException;
import java.util.Iterator;import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;public class XMLParser {
public static void main(String[] args) {
String xml = "<root><flw><name>aa</name><age>22</age><instance_info><num>1</num><code>0</code><instance><ip>10.1.1.2</ip><mask>9999</mask></instance><instance><ip>10.1.1.5</ip><mask>717</mask></instance></instance_info><instance_info><num>2</num><code>33</code><instance><ip>10.1.1.2</ip><mask>9999</mask></instance><instance><ip>10.1.1.9</ip><mask>878</mask></instance></instance_info></flw></root>"; long start = System.currentTimeMillis(); SAXReader reader = new SAXReader();
try {
org.dom4j.Document doc = reader.read(new ByteArrayInputStream(xml
.getBytes("UTF-8")));
org.dom4j.Element root = doc.getRootElement();
org.dom4j.Element element;
org.dom4j.Element element2;
org.dom4j.Element element3;
for (Iterator i = root.elementIterator("flw"); i.hasNext();) {
element = (org.dom4j.Element) i.next();
System.out
.println("name:[" + element.elementText("name") + "]");
System.out.println("age:[" + element.elementText("age") + "]");
for (Iterator j = element.elementIterator("instance_info"); j
.hasNext();) {
element2 = (org.dom4j.Element) j.next();
System.out.println("\tnum:[" + element2.elementText("num")
+ "]");
System.out.println("\tcode:["
+ element2.elementText("code") + "]");
for (Iterator k = element2.elementIterator("instance"); k
.hasNext();) {
element3 = (org.dom4j.Element) k.next();
System.out.println("\t\tip:["
+ element3.elementText("ip") + "]");
System.out.println("\t\tmask:["
+ element3.elementText("mask") + "]");
}
}
}
} catch (DocumentException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
long end = System.currentTimeMillis();
System.out.println("耗时：" + (end - start) + "ms");
}
}