Java JDOM解析器 解析XML文档
Java JDOM解析器 解析XML文档的步骤
以下是使用 JDOM解析器 解析文档时使用的步骤。
- 导入与 XML 相关的包。
- 创建一个文档生成器。
- 从文件或流创建文档
- 提取根元素
- 检查属性
- 检查子元素
导入 XML 相关的包
import java.io.*;
import java.util.*;
import org.jdom2.*;
创建一个文档生成器
SAXBuilder saxBuilder = new SAXBuilder();
从文件或流创建文档
File inputFile = new File("input.txt");
SAXBuilder saxBuilder = new SAXBuilder();
Document document = saxBuilder.build(inputFile);
提取根元素
Element classElement = document.getRootElement();
检查属性
//returns specific attribute
getAttribute("attributeName");
检查子元素
//returns a list of subelements of specified name
getChildren("subelementName");
//returns a list of all child nodes
getChildren();
//returns first child node
getChild("subelementName");
Java JDOM解析器 解析XML文档的示例
input.xml文件:
<?xml version = "1.0"?>
<class>
<student rollno = "393">
<firstname>dinkar</firstname>
<lastname>kad</lastname>
<nickname>dinkar</nickname>
<marks>85</marks>
</student>
<student rollno = "493">
<firstname>Vaneet</firstname>
<lastname>Gupta</lastname>
<nickname>vinni</nickname>
<marks>95</marks>
</student>
<student rollno = "593">
<firstname>jasvir</firstname>
<lastname>singn</lastname>
<nickname>jazz</nickname>
<marks>90</marks>
</student>
</class>
JDomParserDemo解析程序
package com.yiidian;
import org.jdom2.Attribute;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.input.SAXBuilder;
import java.io.File;
import java.io.IOException;
import java.util.List;
public class JDomParserDemo {
public static void main(String[] args) {
try {
File inputFile = new File("input.xml");
SAXBuilder saxBuilder = new SAXBuilder();
Document document = saxBuilder.build(inputFile);
System.out.println("Root element :" + document.getRootElement().getName());
Element classElement = document.getRootElement();
List<Element> studentList = classElement.getChildren();
System.out.println("----------------------------");
for (int temp = 0; temp < studentList.size(); temp++) {
Element student = studentList.get(temp);
System.out.println("\nCurrent Element :"
+ student.getName());
Attribute attribute = student.getAttribute("rollno");
System.out.println("Student roll no : "
+ attribute.getValue() );
System.out.println("First Name : "
+ student.getChild("firstname").getText());
System.out.println("Last Name : "
+ student.getChild("lastname").getText());
System.out.println("Nick Name : "
+ student.getChild("nickname").getText());
System.out.println("Marks : "
+ student.getChild("marks").getText());
}
} catch(JDOMException e) {
e.printStackTrace();
} catch(IOException ioe) {
ioe.printStackTrace();
}
}
}
输出结果为:
热门文章
优秀文章