1、首先需要下载json-lib-2.4-jdk15.jar包。

下载地址：http://sourceforge.net/projects/json-lib/files/json-lib/json-lib-2.4/。也可以下载到源码

其他需要的jar:

a.commons-beanutils.jar

b.commons-collections.jar

c.commons-lang.jar

d.commons-logging.jar

e.ezmorph-1.0.6.jar

2、主要使用JSONObject进行对象与Json字符串之间的转换

方法：fromObject(object)

          把对象转换为JSONObject对象，使用toString方法就可以获取json字符串

          这个方法既可以传入对象，也可以传入json字符串

方法：toBean(JSONObject, class)

          把json字符串转为对象

示例：

public static void main(String[] args) {
		Student student = new Student("cb", 24, "04050102"); 
		JSONObject object =	JSONObject.fromObject(student);
		String json = object.toString();
		System.out.println(json);
		JSONObject jO = JSONObject.fromObject(object.toString());
		Object object2 = JSONObject.toBean(jO, Student.class);
		Student student2  = (Student)object2;
		System.out.println(student2.getClassName());
	}

Student类

public class Student {
	private Person mPerson;
	private String mClassName;
	
	public Student() {
		
	}
	
	public Student(String name, int age, String className) {
		mPerson = new Person(name, age);
		mClassName = className;
	}
	
	public Person getPerson() {
		return mPerson;
	}
	
	public void setPerson(Person person) {
		mPerson = person;
	}
	
	public String getClassName() {
		return mClassName;
	}
	
	public void setClassName(String className) {
		mClassName = className;
	}
}

Person类

public class Person {
	private String mName;
	private int mAge;
	
	public Person() {
		
	}
	
	public Person(String name, int age) {
		mName = name;
		mAge = age;
	}
	
	public String getName() {
		return mName;
	}
	
	public void setName(String name) {
		mName = name;
	}
	
	public int getAge() {
		return mAge;
	}
	
	public void setAge(int age) {
		mAge = age;
	}
}

源码下载点击打开链接