通过JAXB实现完成java对象和xml的互相转换

 

在项目中我们常常需要将java对象转为Xml，将xml转为java对象，这些繁琐的操作我们使用JAXB的话就可以很轻松的实现，一起看一个例子吧

package com.xiongpan.model;

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

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class ClassRoom {
       private String classid;
       private String classname;
       private List<Student> list= new ArrayList<Student>();
       public String getClassid() {
             return classid;
      }
       public void setClassid(String classid) {
             this. classid = classid;
      }
       public String getClassname() {
             return classname;
      }
       public void setClassname(String classname) {
             this. classname = classname;
      }
       public List<Student> getList() {
             return list;
      }
       public void setList(List<Student> list) {
             this. list = list;
      }
       public ClassRoom(String classid, String classname, List<Student> list) {
             super();
             this. classid = classid;
             this. classname = classname;
             this. list = list;
      }
       public ClassRoom() {
             super();
             
      }
       @Override
       public String toString() {

            StringBuffer sb= new StringBuffer();
            
            sb.append( "classid="+ this. classid+ "   ");
            sb.append( "classname"+ this. classname+ " ");
             for (Student st : list) {
                  sb.append(st.toString());
            }
             return sb.toString();
      }

}

 

package com.xiongpan.model;

public class Student {
      
       private String id;
       private String name;
       private int age;
       public String getId() {
             return id;
      }
       public void setId(String id) {
             this. id = id;
      }
       public String getName() {
             return name;
      }
       public void setName(String name) {
             this. name = name;
      }
       public int getAge() {
             return age;
      }
       public void setAge( int age) {
             this. age = age;
      }
       public Student(String id, String name, int age) {
             super();
             this. id = id;
             this. name = name;
             this. age = age;
      }
       public Student() {
             super();
             // TODO Auto-generated constructor stub
      }
       @Override
       public String toString() {
             return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
      }
      
}

 

package com.xiongpan.model;

import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;

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

import org.junit.Test;

public class MyTest {
	
	@Test
	public void testJaxbToXml(){
		
		try {
			
			Student s1=new Student("1", "ggd1", 21);
			Student s2=new Student("2", "ggd2", 21);
			Student s3=new Student("3", "ggd3", 21);
			Student s4=new Student("4", "ggd4", 21);
			Student s5=new Student("5", "ggd5", 26);
			Student s6=new Student("6", "ggd6", 21);
			Student s7=new Student("7", "ggd7", 26);
			
			List<Student> list=new ArrayList<Student>();
			list.add(s1);
			list.add(s2);
			list.add(s3);
			list.add(s4);
			list.add(s5);
			list.add(s6);
			list.add(s7);
			 
			ClassRoom classRoom=new ClassRoom("131123-1", "bestClassRoom", list);
			
			JAXBContext ct=JAXBContext.newInstance(ClassRoom.class);
			Marshaller marshaller=	ct.createMarshaller();
			marshaller.marshal(classRoom, System.out);
			
		} catch (JAXBException e) {
			e.printStackTrace();
		}
		
	}
	
	@Test
	public void TestjaxbToObject(){
		try {
			String xml="<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><classRoom><classid>131123-1</classid><classname>bestClassRoom</classname><list><age>21</age><id>1</id><name>ggd1</name></list><list><age>21</age><id>2</id><name>ggd2</name></list><list><age>21</age><id>3</id><name>ggd3</name></list><list><age>21</age><id>4</id><name>ggd4</name></list><list><age>26</age><id>5</id><name>ggd5</name></list><list><age>21</age><id>6</id><name>ggd6</name></list><list><age>26</age><id>7</id><name>ggd7</name></list></classRoom>";
			
			JAXBContext jaxbContext=JAXBContext.newInstance(ClassRoom.class);
			Unmarshaller unmarshaller=jaxbContext.createUnmarshaller();
			ClassRoom classRoom= (ClassRoom) unmarshaller.unmarshal(new StringReader(xml));
			
			System.out.println(classRoom.toString());
			
		} catch (JAXBException e) {
			e.printStackTrace();
		}
	}

}

 

testJaxbToXml执行结果
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><classRoom><classid>131123-1</classid><classname>bestClassRoom</classname><list><age>21</age><id>1</id><name>ggd1</name></list><list><age>21</age><id>2</id><name>ggd2</name></list><list><age>21</age><id>3</id><name>ggd3</name></list><list><age>21</age><id>4</id><name>ggd4</name></list><list><age>26</age><id>5</id><name>ggd5</name></list><list><age>21</age><id>6</id><name>ggd6</name></list><list><age>26</age><id>7</id><name>ggd7</name></list></classRoom>



 // xml  To java Object执行结果
classid=131123-1   classnamebestClassRoom Student [id=1, name=ggd1, age=21]Student [id=2, name=ggd2, age=21]Student [id=3, name=ggd3, age=21]Student [id=4, name=ggd4, age=21]Student [id=5, name=ggd5, age=26]Student [id=6, name=ggd6, age=21]Student [id=7, name=ggd7, age=26]