dom4j解析xml文件的问题

Question

需要解析的xml文件内容如下：


SOAP-ENV:Body


m0:operate_typeI/m0:operate_type
m0:area_code001/m0:area_code
m0:area_nameString/m0:area_name
m0:area_frameString/m0:area_frame
m0:order_no0/m0:order_no
m0:parent_area_codeString/m0:parent_area_code
m0:start_dateString/m0:start_date
m0:end_dateString/m0:end_date
m0:area_level0/m0:area_level
m0:validflagString/m0:validflag
m0:remarkString/m0:remark
m0:paraString/m0:para
m0:para_idString/m0:para_id
m0:para_valueString/m0:para_value
/m:arg0
/m:syncAreaInfo
/SOAP-ENV:Body
/SOAP-ENV:Envelope

SOAP-ENV:Body


m0:operate_typeD/m0:operate_type
m0:area_code001/m0:area_code
m0:area_nameString/m0:area_name
m0:area_frameString/m0:area_frame
m0:order_no0/m0:order_no
m0:parent_area_codeString/m0:parent_area_code
m0:start_dateString/m0:start_date
m0:end_dateString/m0:end_date
m0:area_level0/m0:area_level
m0:validflagString/m0:validflag
m0:remarkString/m0:remark
m0:paraString/m0:para
m0:para_idString/m0:para_id
m0:para_valueString/m0:para_value
/m:arg0
/m:syncAreaInfo
/SOAP-ENV:Body
/SOAP-ENV:Envelope

我要取到所有的SOAP-ENV:Body元素
java 代码如下：
public static void main(String[] args) {
SAXReader saxReader = new SAXReader();
try {
Document document = saxReader.read("D:/syncAreaInfo.xml");
List list=document.selectNodes("//m:arg0");
Iterator iterator=list.iterator();
while(iterator.hasNext()){
Element node=(Element)iterator.next();
System.out.println("node is "+node.getName());
}
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
但是貌似标签命中包含“：”就会出错
org.dom4j.XPathException: Exception occurred evaluting XPath: //m:arg0. Exception: XPath expression uses unbound namespace prefix m
at org.dom4j.xpath.DefaultXPath.handleJaxenException(DefaultXPath.java:374)
at org.dom4j.xpath.DefaultXPath.selectNodes(DefaultXPath.java:134)
at org.dom4j.tree.AbstractNode.selectNodes(AbstractNode.java:166)
at com.unicom.service.XmlParser.main(XmlParser.java:20)
Exception in thread "main"

如果把“：”换成“-”就没有问题，但这个文件时别人传过来的，格式就是这样又不能改，请问怎样才能取到这些节点呢

Answer 1

XML中，ooo:xxx中，ooo是命名空间。

XML里有xmlns:m="http://service.unicom.com"这样的声明，但是Java程序里没有。所以，处理带命名空间的XML的时候，应该告诉Java程序，每个命名空间前缀（比如“m”）具体代表什么命名空间，（比如“http://service.unicom.com”）。

[code="java"]package dom4jnstest;

import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.xpath.DefaultXPath;

public class Dom4jNsTest {

public static void main(String[] args) throws Exception {
    SAXReader saxReader = new SAXReader();
    Document document = saxReader.read(Dom4jNsTest.class
            .getResourceAsStream("x.xml"));

    DefaultXPath xpath = new DefaultXPath("//m:arg0");
    xpath.setNamespaceURIs(Collections.singletonMap("m",
            "http://service.unicom.com"));

    List list = xpath.selectNodes(document);
    Iterator iterator = list.iterator();
    while (iterator.hasNext()) {
        Element node = (Element) iterator.next();
        System.out.println("node is " + node.getName());
    }
}

}
[/code]