java注解XML

 

用的是jdk自带的javax.xml.bind.JAXBContext将对象和xml字符串进行相互转换。

比较常用的几个：

　　@XmlRootElement：根节点

　　@XmlAttribute：该属性作为xml的attribute

　　@XmlElement：该属性作为xml的element，且可以增加属性(name="NewElementName")，那么生成的xml串的elment的标签是NewElementName

 

首先，java注解读取XML。

    一、新建school.xml文件，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<SCHOOL>
    <name>延边大学</name>
    <address>吉林延吉市</address>
    <student grade="1">
        <num>001</num>
        <name>小杜</name>
        <age>23</age>
    </student>
    <student grade="2">
        <num>002</num>
        <name>小张</name>
        <age>21</age>
    </student>
</SCHOOL>

二、根据配置文件书写对应的注解类。

　　编写Student基类，内容如下：

　

package com.cvicse.ump.xml.school;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;

public class Student {
	
	
	private String studentNum;
	private String studentName;
	private String studentGrade;
	private int age;
	
	@XmlElement(name="num")
	public String getStudentNum() {
		return studentNum;
	}
	public void setStudentNum(String studentNum) {
		this.studentNum = studentNum;
	}
	@XmlElement(name="name")
	public String getStudentName() {
		return studentName;
	}
	public void setStudentName(String studentName) {
		this.studentName = studentName;
	}
	@XmlAttribute(name="grade")
	public String getStudentGrade() {
		return studentGrade;
	}
	public void setStudentGrade(String studentGrade) {
		this.studentGrade = studentGrade;
	}
	@XmlElement
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
	@Override
	public String toString() {
		return "Student [studentNum=" + studentNum + ", studentName="
				+ studentName + ", studentGrade=" + studentGrade + ", age="
				+ age + "]";
	}
	
	

}

　　

编写基类school，内容如下：

package com.cvicse.ump.xml.school;

import java.util.List;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="SCHOOL")
public class School {
    
    private String name;
    private String address;
    private List<Student>students;
    
    @XmlElement
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @XmlElement
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    @XmlElement(name="student")
    public List<Student> getStudents() {
        return students;
    }
    public void setStudents(List<Student> students) {
        this.students = students;
    }
    @Override
    public String toString() {
        return "School [name=" + name + ", address=" + address + "]";
    }

}

 

编写XML读取程序：

package com.cvicse.ump.xml.school;

import java.io.File;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

public class SchoolRead {
	
	public static void main(String[] args) {
		
		File file = new File("src/school.xml");
		try {
			JAXBContext context = JAXBContext.newInstance(School.class);
			Unmarshaller unMar = context.createUnmarshaller();
			School school = (School) unMar.unmarshal(file);
			System.out.println(school);
			List<Student>students = school.getStudents();
			for(Student student:students){
				System.out.println(student);
			}
		} catch (JAXBException e) {
			e.printStackTrace();
		}
	}
}

　　

编写写入文件程，内容如下：

 

package com.cvicse.ump.xml.school;

import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

public class SchoolWrite {
	
	public static void main(String[] args) {
		
		School school = new School();
		school.setName("实验小学");
		school.setAddress("山东济南市");
		
		List<Student> students = new ArrayList<Student>();
		Student student1 = new Student();
		student1.setStudentNum("001");
		student1.setStudentName("xiaoDy");
		student1.setAge(25);
		student1.setStudentGrade("1");
		
		Student student2 = new Student();
		student2.setStudentNum("002");
		student2.setStudentName("xiaoWf");
		student2.setAge(22);
		student2.setStudentGrade("2");
		
		students.add(student1);
		students.add(student2);
		school.setStudents(students);
		try {
			JAXBContext context = JAXBContext.newInstance(School.class);
			Marshaller mar = context.createMarshaller();
			mar.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
			mar.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
			mar.marshal(school, System.out);
		} catch (JAXBException e) {
			e.printStackTrace();
		}
		
		
	}

}

　　

源码下载：https://yunpan.cn/cxDZgKQbeDLqt （提取码：68e1）

 

参考网址：http://blog.csdn.net/lhzjj/article/details/11796713