XStream快速起步 簡單方便實現序列化(XML和JSON)

其實XStream和JAXB在一些觀念上是很相似的

但是JAXB作爲Java EE的一個規範 是非常正式的 且和其他很多規範有聯繫 是一種標準的實現

這邊簡單說說實現方式(博客裏有文介紹使用):

1.一個實體類,使用@XmlRootElement表示一下類(最簡單的)

2.建立一個ObjectFactory用來產生這個實體類

3.使用JAXBContext 然後產生Marshaller(對象-->xml)或者UnMarshaller(xml-->對象)

 

 

而XStream使用起來更爲簡單

 

1.首先從XStream官網下載XStream

http://xstream.codehaus.org/download.html

 

2.下載後解壓 將lib下的jar添加入項目就可以了

如下:

 

然後就可以編寫代碼了

爲了方便 直接使用XStream的annotation:

 

3.實體類 Person:

 

package org.cc.vo;

import java.util.List;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamAsAttribute;
import com.thoughtworks.xstream.annotations.XStreamImplicit;
import com.thoughtworks.xstream.annotations.XStreamOmitField;

@XStreamAlias("Person")
public class Person {

    @XStreamAlias("name")
    @XStreamAsAttribute
    private String name;

    @XStreamAlias("age")
    private int age;

    @XStreamAlias("sex")
    private boolean sex;

    @XStreamImplicit(itemFieldName="favor")
    private List<String> favor;

    @XStreamOmitField
    private int tempid;

    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 boolean isSex() {
        return sex;
    }

    public void setSex(boolean sex) {
        this.sex = sex;
    }

    public List<String> getFavor() {
        return favor;
    }

    public void setFavor(List<String> favor) {
        this.favor = favor;
    }

    public int getTempid() {
        return tempid;
    }

    public void setTempid(int tempid) {
        this.tempid = tempid;
    }

    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + ", sex=" + sex
                + ", favor=" + favor + ", tempid=" + tempid + "]";
    }



}

package org.cc.vo;

import java.util.List;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.annotations.XStreamAsAttribute;
import com.thoughtworks.xstream.annotations.XStreamImplicit;
import com.thoughtworks.xstream.annotations.XStreamOmitField;

@XStreamAlias("Person")
public class Person {

	@XStreamAlias("name")
	@XStreamAsAttribute
	private String name;
	
	@XStreamAlias("age")
	private int age;
	
	@XStreamAlias("sex")
	private boolean sex;
	
	@XStreamImplicit(itemFieldName="favor")
	private List<String> favor;

	@XStreamOmitField
	private int tempid;
	
	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 boolean isSex() {
		return sex;
	}

	public void setSex(boolean sex) {
		this.sex = sex;
	}

	public List<String> getFavor() {
		return favor;
	}

	public void setFavor(List<String> favor) {
		this.favor = favor;
	}

	public int getTempid() {
		return tempid;
	}

	public void setTempid(int tempid) {
		this.tempid = tempid;
	}

	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + ", sex=" + sex
				+ ", favor=" + favor + ", tempid=" + tempid + "]";
	}



}

 @XStreamAlias(value)是別名 可以用在類名和屬性名上修改顯示的xml中的標籤

 @XStreamAsAttribute 把屬性作爲xml中的屬性 而不是子元素

 @XStreamImplicit(itemFieldName="favor") 還有一個keyFieldName的屬性 這個是用來改寫List和Map的顯示 的

 @XStreamOmitField 此標記的屬性不會序列化

 

 

4.接下去只有一步,沒有JAXB的建立ObjectFactory那一部,實現起來非常簡潔直觀:

package org.cc.vo;

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

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;

public class Main {

    public static void main(String[] args) {
         XStream x=new XStream();
//         XStream x = new XStream(new JettisonMappedXmlDriver());
         x.processAnnotations(Person.class);
         Person p=new Person();
         p.setAge(30);
         List<String> fa=new ArrayList<String>();
         fa.add("遊戲");
         fa.add("上網");
         p.setFavor(fa);
         p.setName("cc");
         String info=x.toXML(p);
         System.out.println(info);

         Person p2=(Person)x.fromXML(info);
         System.out.println(p2);
    }

}

package org.cc.vo;

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

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;

public class Main {

	public static void main(String[] args) {
         XStream x=new XStream();
//         XStream x = new XStream(new JettisonMappedXmlDriver());
         x.processAnnotations(Person.class);
         Person p=new Person();
         p.setAge(30);
         List<String> fa=new ArrayList<String>();
         fa.add("遊戲");
         fa.add("上網");
         p.setFavor(fa);
         p.setName("cc");
         String info=x.toXML(p);
         System.out.println(info);
         
         Person p2=(Person)x.fromXML(info);
         System.out.println(p2);
	}

}

 輸出:

<Person name="cc">
  <age>30</age>
  <sex>false</sex>
  <favor>遊戲</favor>
  <favor>上網</favor>
</Person>
Person [name=cc, age=30, sex=false, favor=[遊戲, 上網], tempid=0]

<Person name="cc">
  <age>30</age>
  <sex>false</sex>
  <favor>遊戲</favor>
  <favor>上網</favor>
</Person>
Person [name=cc, age=30, sex=false, favor=[遊戲, 上網], tempid=0]

 

注意了以上代碼註釋掉的那塊打開 並把沒有參數的構造方法的XStream那一段註釋掉產生的就是JSON(換了一個引擎）

產生內容如下:

{"Person":{"@name":"cc","age":30,"sex":false,"favor":["遊戲","上網"]}}
Person [name=cc, age=30, sex=false, favor=[遊戲, 上網], tempid=0]

{"Person":{"@name":"cc","age":30,"sex":false,"favor":["遊戲","上網"]}}
Person [name=cc, age=30, sex=false, favor=[遊戲, 上網], tempid=0]