jaxb 序列化java.util.List

jaxb序列化java.util.List

package cn.outofmemory.jaxb;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import javax.xml.bind.JAXB;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;

public class JAXBDemo {
private List names;

public List getNames() {
return names;
}

public void setNames(List names) {
this.names = names;
}

public static void main(String[] args) {
List list = new ArrayList();
list.add("I'm a string");
list.add("I'm also a string.");
JAXBDemo demo = new JAXBDemo();
demo.setNames(list);
JAXB.marshal(demo, System.out);
}
}
上述代码中，我们序列化一个包含List属性的java实例，并将序列化的结果输出到控制台，输出结果如下：

I'm a string
I'm also a string.

可以看到names属性被序列化为两个names节点，如果java bean中属性较多的话就会产生混乱，我们可以通过XmlElementWrapper注解来把这两个names节点包装起来，可以通过XmlElement注解修改names节点的名称。如下java代码：

@XmlElementWrapper(name = "names")
@XmlElement(name = "item")
public List getNames() {
return names;
}
这样修改之后输出的xml将变为：

I'm a string
I'm also a string.



jaxb序列化自定义的java pojo list

在JAXBdemo类中添加自定义类Person，并添加persons的属性。

package cn.outofmemory.jaxb;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import javax.xml.bind.JAXB;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;

public class JAXBDemo {
private List names;

@XmlElementWrapper(name = "names")
@XmlElement(name = "item")
public List getNames() {
return names;
}

public void setNames(List names) {
this.names = names;
}

public static void main(String[] args) {
List list = new ArrayList();
list.add("I'm a string");
list.add("I'm also a string.");
JAXBDemo demo = new JAXBDemo();
demo.setNames(list);


List persons = new LinkedList();
persons .add(new Person("zhao", 21));
persons.add(new Person("zhang", 11));
demo.setPersons(persons);

JAXB.marshal(demo, System.out);
}

public static class Person {
private String name;
private int age;
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 Person() {}
public Person(String name_, int age_) {
this.name = name_;
this.age = age_;
}
}

private List persons;

@XmlElementWrapper(name="persons")
@XmlElement(name="person")
public List getPersons() {
return persons;
}
public void setPersons(List persons) {
this.persons = persons;
}

}

对于persons属性，我们同样添加了XmlElementWrapper和XmlElement注解，运行程序的输出如下：

I'm a string
I'm also a string.



21
zhao


11
zhang

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