Java中把json文件变成VO类的几种方式

json格式传输数据很爽，简单普及下json，从百科cp一句话如下：

 

 写道

JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式。它基于JavaScript（Standard ECMA-262 3rd Edition - December 1999）的一个子集。

 

 也就是说大家用json做数据交换跟xml一样，本文基于json-lib版本为json-lib-2.4-jdk15.jar。目的是把一个json串转换成一个vo类。举例

{
    "id": "Elliotte",
    "name": "Harold"
}

把他转换成一个Student实例。查看代码提供方法如下：

public static Object toBean(JSONObject jsonObject)
public static Object toBean(JSONObject jsonObject, Class beanClass)
public static Object toBean(JSONObject jsonObject, Class beanClass, Map classMap)

public static Object toBean(JSONObject jsonObject, JsonConfig jsonConfig)

 使用方式如下：

public class Student {
	private String id;
	private String name;
	 
	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;
    }

	@Override
    public String toString() {
	    return "Student [id=" + id + ", name=" + name + "]";
    }
}

 调用方式：

	public static void main(String[] args) {
		Map<String, Class<String>> classMap = new HashMap<String, Class<String>>();
		classMap.put("id", String.class);
		classMap.put("name", String.class);
		String content = "{ \"id\": \"Elliotte\", \"name\":\"Harold\" }";
		Student vo = new Student();
		try {
			vo = (Student) JSONObject.toBean(JSONObject.fromObject(content), Student.class);
			System.out.println("**Student:" + vo);
			vo = (Student) JSONObject.toBean(JSONObject.fromObject(content), Student.class,
			        classMap);
			System.out.println("**Student:" + vo);
			MorphDynaBean t = (MorphDynaBean) JSONObject.toBean(JSONObject.fromObject(content));
			System.out.println("**Student:" + t.get("id"));
			JsonConfig jc = new JsonConfig();
			jc.setRootClass(Student.class);
			vo = (Student) JSONObject.toBean(JSONObject.fromObject(content), jc);
			System.out.println("**Student:" + vo);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

 注意事宜：

1.vo类必须为public的否则跑属性缺失异常