XML使用JDOM方式读写

1. XML使用JDOM方式读写

JDOM是一种使用XML(标准通用标记语言下的一个子集)的独特Java工具包，用于快速开发XML应用程序。
JDOM官方网站：http://www.jdom.org/
JDOM生成和遍历xml文件。生成xml无法格式化。

1.1 XML使用JDOM方式生成XML文件

引入jdom
新建Folder，导入jdom所用的jar包，右键 --> Build Path --> Add To Build Path
jdom-2.0.5.jar

package com.andrew.xml;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import org.jdom2.Attribute;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.output.XMLOutputter;
public class JDOM01 {
    public static void main(String[] args) {
        Element student = new Element("student");
        Attribute id = new Attribute("id", "001");
        Attribute aa = new Attribute("aa", "xx");
        student.setAttribute(id);
        student.setAttribute(aa);
        Element name = new Element("name");
        name.setText("张三");
        student.addContent(name);
        Element sex = new Element("sex");
        sex.setText("男");
        student.addContent(sex);
        Element age = new Element("age");
        age.setText("20");
        student.addContent(age);
        Document document = new Document(student);
        XMLOutputter out = new XMLOutputter();
        out.setFormat(out.getFormat().setEncoding("UTF-8"));
        try {
            out.output(document, new FileOutputStream("src/studentJDOMOut.xml"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
运行结果：
在src在生成studentJDOMOut.xml
<?xml version="1.0" encoding="UTF-8"?>
<student id="001" aa="xx"><name>张三</name><sex>男</sex><age>20</age></student>

1.2 XML使用JDOM方式读取XML文件

<?xml version="1.0" encoding="UTF-8"?>
<students>
    <student id="001">
        <name>张三</name>
        <sex>男</sex>
        <age>20</age>
    </student>
    <student id="002">
        <name>李四</name>
        <sex>女</sex>
        <age>21</age>
    </student>
</students>

package com.andrew.xml;
import java.util.List;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;
public class JDOM02 {
    public static void main(String[] args) throws Exception {
        SAXBuilder builder = new SAXBuilder();
        Document document = builder.build("src/studentsSax.xml");
        Element students = document.getRootElement();
        List studentList = students.getChildren("student");
        for (int i = 0; i < studentList.size(); i++) {
            Element student = (Element) studentList.get(i);
            String id = student.getAttributeValue("id");
            String name = student.getChildText("name");
            String sex = student.getChildText("sex");
            String age = student.getChildText("age");
            System.out.println("学号：" + id + ";姓名：" + name + ";性别：" + sex + ";年龄：" + age);
        }
    }
}
运行结果：
学号：001;姓名：张三;性别：男;年龄：20
学号：002;姓名：李四;性别：女;年龄：21