几种常用的json序列化和反序列化工具介绍

一、前言

　　Json序列化和反序列化工作中会时常用到，也是目前数据交互的常用格式，Rest风格的接口加上json格式的数据交互，真的是天作之合。

　　目前Json字符与Json对象的相互转换方式有很多，接下来将为大家一一介绍下，感兴趣的朋友可以参考下哈，希望可以帮助到你

二、工具介绍

　　这次为大家介绍常用的三种工具

      1、Fastjson：http://fastjson.codeplex.com/

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.12</version>
</dependency>

　　2、Jackson：http://jackson.codehaus.org/

<dependency>
		    <groupId>com.fasterxml.jackson.core</groupId>
		    <artifactId>jackson-core</artifactId>
		    <version>2.8.0.rc1</version>
		</dependency>
		<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.8.0.rc1</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.8.0.rc1</version>
</dependency>

　　3、Gson：http://code.google.com/p/google-gson/

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.6.2</version>
</dependency>

　　

三、工具使用

　　1、首先创建两个类，一个Student 类，一个Teacher类 代码如下：

　　     Student.java

package com.zsy.model;

public class Student {
	
	String name;
	int age;
	String sex;
	Teacher teacher;

	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 String getSex() {
		return sex;
	}

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

	public Teacher getTeacher() {
		return teacher;
	}

	public void setTeacher(Teacher teacher) {
		this.teacher = teacher;
	}

}

　　   Teacher.java

package com.zsy.model;

public class Teacher {
	
	String name;
	String Sex;
	int age;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return Sex;
	}
	public void setSex(String sex) {
		Sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
}

　　　2、使用方法

import java.io.IOException;

import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.zsy.model.Student;
import com.zsy.model.Teacher;

public class Test {
	
	public static void main(String args[]) throws IOException{
		
		Student student=new Student();
		student.setName("小明");
		student.setAge(10);
		student.setSex("男");
		
		Teacher teacher=new Teacher();
		teacher.setName("lisa");
		teacher.setAge(35);
		teacher.setSex("女");
		student.setTeacher(teacher);
		
		//jackson-core obj->json
		ObjectMapper mapper=new ObjectMapper();
		String json=mapper.writeValueAsString(student);
		System.out.println(json);
		//jsckson json->obj
		Student studentObj=mapper.readValue(json, Student.class);
		System.out.println(studentObj.getName()+"=======");
		
		//GSON 序列化 obj->json
		String jsonstr = new Gson().toJson(student);  
		System.out.println(jsonstr);
		//GSON 反序列化 json->obj
		Student myobj = new Gson().fromJson(jsonstr, Student.class);  
		System.out.println(myobj.getName()+"=======");
		
		
		//alibaba  fastJson 
		String jsons=JSON.toJSONString(studentObj);
		System.out.println(jsons);
		
		Student stu=JSON.parseObject(json, Student.class);
	    System.out.println(stu.getName()+"==========");
		
	}

}