使用JDOM2.0.4 操作/解析xml

一、解析xml内容

xml文件内容:

<?xml version="1.0" encoding="utf-8"?>
<RETVAL success='true'>
<Shop><sid>1</sid><name>北京鑫和易通贸易有限公司</name></Shop>
<Shop><sid>2</sid><name>张家口市金九福汽车服务有限公司</name></Shop>
</RETVAL>

解析的java代码

import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;
import org.xml.sax.InputSource;

public Class Test{

public static List test() throws Exception{
　　List result = new ArrayList();

　　SAXBuilder builder = new SAXBuilder();
　　StringReader read = new StringReader(xmlDoc);
　　InputSource source = new InputSource(read);
　　Document document = builder.build(source);
　　Element root = document.getRootElement();// 获得根节点
　　String ifSuccess = root.getAttributeValue("success");
　　if (!"true".equals(ifSuccess)) {// 不成功直接返回
   　　 throw new Exception("从接口获取全部经销商数据时不成功！");
　　}

　　List<Element> childrenList = root.getChildren();
　　for (Element e : childrenList) {
     　　Map elementMap = new HashMap<String, String>();
     　　elementMap.put("sid", e.getChildText("sid")); // 经销商id
     　　elementMap.put("name", e.getChildText("name")); // 经销商名称
            
     　　result.add(elementMap);
 　　}
        
 　　return result;
　　}
}

---

二、解析和操作xml文件

xml文件内容

<?xml version="1.0" encoding="UTF-8"?>
<root>
 <person id="1">
  <username>张三</username>
  <password>123123</password>
 </person>
 <person id="2">
  <username>1111111112</username>
  <password>password2</password>
 </person>
</root>

JDOM构建document对象的方法

Document    build(java.io.File file)       //This builds a document from the supplied filename.
Document    build(org.xml.sax.InputSource in)   //This builds a document from the supplied input source.
Document    build(java.io.InputStream in)    //This builds a document from the supplied input stream.
Document    build(java.io.InputStream in, java.lang.String systemId)   //This builds a document from the supplied input stream.
Document    build(java.io.Reader characterStream)   //This builds a document from the supplied Reader.
Document    build(java.io.Reader characterStream, java.lang.String systemId)  //This builds a document from the supplied Reader.
Document    build(java.lang.String systemId)  //This builds a document from the supplied URI.
Document    build(java.net.URL url)   //This builds a document from the supplied URL.

解析、新增、修改、删除xml节点属性的java

package test;

import java.io.FileWriter;
import java.util.List;

import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;

public class Test {

    /**
     * @param args
     * @throws Exception 
     */
    public static void main(String[] args) throws Exception {
        SAXBuilder builder = new SAXBuilder();
        //Document doc = builder.build(new File("src/test.xml"));
        //Document doc = builder.build(new FileInputStream("src/test.xml"));
        //Document doc = builder.build(new FileReader("src/test.xml"));
        //Document doc = builder.build(new URL("http://localhost:8080/jdomTest/test.xml"));
        Document doc = builder.build("src/test.xml");
        
        
        //readXmlFile(doc);
        //addXmlElement(doc);
        //updateXmlElement(doc);
        deleteXmlElement(doc);
    }

    /**
     * 解析xml文件
     * @throws Exception
     */
    public static void readXmlFile(Document doc) throws Exception {
    
        Element root = doc.getRootElement(); //获取根元素
        
        System.out.println("---获取第一个子节点和子节点下面的节点信息------");
        Element e = root.getChild("person"); //获取第一个子元素
        System.out.println("person的属性id的值："+e.getAttributeValue("id")); //获取person的属性值
        for(Element el: e.getChildren()){
            System.out.println(el.getText());//第一次输入张三  第二次输出123123
            System.out.println(el.getChildText("username"));//这里这么写会是null
            System.out.println(el.getChildText("password"));//这里这么写会是null
        }
        
        System.out.println("---直接在根节点下就遍历所有的子节点---");
        for(Element el: root.getChildren()){
            System.out.println(el.getText());//这里输出4行空格
            System.out.println(el.getChildText("username"));//输出张三   & 1111111112
            System.out.println(el.getChildText("password"));//输出123123 &  password2
        }
    }
    
    /**
     * 新增节点
     * @throws Exception
     */
    public static void addXmlElement(Document doc) throws Exception {
        Element root = doc.getRootElement(); //获取根元素
        
        Element newEle = new Element("person");//设置新增的person的信息
        newEle.setAttribute("id","88888");
        
        Element chiledEle = new Element("username"); //设置username的信息
        chiledEle.setText("addUser");
        newEle.addContent(chiledEle);
        
        Element chiledEle2 = new Element("password"); //设置password的信息
        chiledEle2.setText("addPassword");
        newEle.addContent(chiledEle2);
        
        root.addContent(newEle);
        
        
        XMLOutputter out = new XMLOutputter();
        out.setFormat(Format.getCompactFormat().setEncoding("GBK"));//设置UTF-8编码,理论上来说应该不会有乱码，但是出现了乱码,故设置为GBK
        out.output(doc, new FileWriter("src/test.xml")); //写文件
    }
    
    /**
     * 更新节点
     * @param doc
     * @throws Exception
     */
    public static void updateXmlElement(Document doc) throws Exception {
        Element root = doc.getRootElement(); //获取根元素
        
        //循环person元素并修改其id属性的值
        for(Element el : root.getChildren("person")){
            el.setAttribute("id","haha");
        }
        //循环设置username和password的文本值和添加属性
        for(Element el: root.getChildren()){
            el.getChild("username").setAttribute("nameVal", "add_val").setText("update_text"); 
            el.getChild("password").setAttribute("passVal", "add_val").setText("update_text"); 
        }
        
        XMLOutputter out = new XMLOutputter();
        out.setFormat(Format.getCompactFormat().setEncoding("GBK"));//设置UTF-8编码,理论上来说应该不会有乱码，但是出现了乱码,故设置为GBK
        out.output(doc, new FileWriter("src/test.xml")); //写文件
    }
    
    /**
     * 删除节点和属性
     * @param doc
     * @throws Exception
     */
    public static void deleteXmlElement(Document doc) throws Exception {
        Element root = doc.getRootElement(); //获取根元素
        
        List<Element> personList = root.getChildren("person");
        
        //循环person元素,删除person的id为1的id属性以及username子节点
        for(Element el : personList){
            if(null!=el.getAttribute("id") && "1".equals(el.getAttribute("id").getValue())){
                el.removeAttribute("id");
                el.removeChild("username");
            }
        }
        
        //循环person元素,删除person的id为2的节点
        for(int i=0; i<personList.size(); i++){
            Element el = personList.get(i);
            if(null!=el.getAttribute("id") &&  "2".equals(el.getAttribute("id").getValue())){
                root.removeContent(el);//从root节点上删除该节点
                //警告：此处删除了节点可能会使personList的长度发生变化而发生越界错误,故不能写成for(int i=0,len=personList.size(); i<len; i++)
            }
        }

        XMLOutputter out = new XMLOutputter();
        out.setFormat(Format.getCompactFormat().setEncoding("GBK"));//设置UTF-8编码,理论上来说应该不会有乱码，但是出现了乱码,故设置为GBK
        out.output(doc, new FileWriter("src/test.xml")); //写文件
    }
}