jdom使用入门及namespace注意事项【原】

时间：2022-02-16 04:30:36

报文样例

<person:info xmlns:person="http://person/abc" id="1">

<fruit id="2">

    <apple id="3" color="red" size="big" >good apple</apple>

</fruit>

    <person:pets id="4">

        <cat:pet xmlns:cat="http://cat/def" id="5" type="cat">

            <person:master id="6">King</person:master>

            <cat:age id="7">1</cat:age>

            <cat:color id="8">white</cat:color>

            <happy id="9">true</happy>

        </cat:pet>

        <dog:pet xmlns:dog="http://dog/ghi" id="10" type="dog">

            <person:master id="11">King</person:master>

            <dog:age id="12">2</dog:age>

            <dog:color id="13">white</dog:color>

            <happy id="14">false</happy>

        </dog:pet>

    </person:pets>

</person:info>

jdom样例

package d;

import java.io.File;

import java.util.List;

import org.jdom.Attribute;

import org.jdom.Document;

import org.jdom.Element;

import org.jdom.Namespace;

import org.jdom.input.SAXBuilder;

import org.jdom.output.Format;

import org.jdom.output.XMLOutputter;

public class JdomDemo {

    @SuppressWarnings({ "unused", "unchecked" })

    public static void main(String[] args) throws Exception{

        File file = new File("C:/Users/35992/Desktop/a.xml");

        Document doc =  (new SAXBuilder()).build(file);

        Element root = doc.getRootElement();

        Namespace rootNS = root.getNamespace();

        Element fruit = root.getChild("fruit");//取单个直接孩子节点

        Element apple =fruit.getChild("apple");//取单个直接孩子节点

        List<Attribute> attrList =  apple.getAttributes();

        for(int i = 0 ; i < attrList.size() ; i++){//遍历apple 的3个属性

            String appleAttrValue = attrList.get(i).getValue();

            System.out.println(appleAttrValue);

        }

        //<person:pets id="4"> 有冒号需要添加person的Namespace,不添加会找不到,返回null

        Element petNull = root.getChild("pets");

        //<person:pets id="4"> 有冒号需要添加person的Namespace

        Element petNotNull = root.getChild("pets",Namespace.getNamespace("person", "http://person/abc"));

        Element pets = root.getChild("pets", rootNS);//取单个直接孩子节点

        List<Element> petList = pets.getChildren();//取所有直接孩子节点们

        for(int i = 0 ; i < petList.size(); i++){//pets有2个pet子节点

            Element pet = petList.get(i);

            if("cat".equals(pet.getAttributeValue("type"))){

                Element masterNull = pet.getChild("master");

                Element ageNull = pet.getChild("age");

                Element colorNull = pet.getChild("color");

                Element happy = pet.getChild("happy");

                System.out.println(masterNull+" - " + ageNull+" - " +  colorNull+" - " +  happy);

            }

            if("dog".equals(pet.getAttributeValue("type"))){

                //<person:master id="11">King</person:master> 有冒号需要添加person的Namespace

                Element master = pet.getChild("master",Namespace.getNamespace("person", "http://person/abc"));

                //<dog:age id="12">2</dog:age> 有冒号需要添加dog的Namespace

                Element age = pet.getChild("age",Namespace.getNamespace("dog", "http://dog/ghi"));

                //<dog:color id="13">white</dog:color> 有冒号需要添加dog的Namespace

                Element color = pet.getChild("color",Namespace.getNamespace("dog", "http://dog/ghi"));

                Element happy = pet.getChild("happy");//<happy id="14">false</happy> 没有冒号,直接取

                System.out.println(master+" - " + age+" - " +  color+" - " +  happy);

            }

        }

        //格式化输出xml文件字符串

        Format format = Format.getCompactFormat().setEncoding("utf-8").setIndent("\t");

        XMLOutputter xmlout = new XMLOutputter(format);

        String result = xmlout.outputString(doc);

        System.out.println(result);

    }

}

参考

XML 命名空间（XML Namespaces）--http://www.w3school.com.cn/xml/xml_namespaces.asp

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