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 } }
