json转换

com.google.gson.Gson的三种基本使用，废话不多说，直接上sample.【依赖包见附件】

(1)： //泛型List转成Json

(2):  //简单对象的转换

(3):  //json字符串转换成对象

 

 

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import com.google.gson.Gson;



/**
 * 泛型List转成Json
 * @author Administrator
 *
 */
public class JsonSample {
	public static void main(String[] args) {
		
		List<User> userList=new ArrayList<User>();
		User user=new User();
		user.setName("张明");
		user.setSex("男");
		userList.add(user);
		User user1=new User();
		user1.setName("张明1");
		user1.setSex("男1");
		userList.add(user1);
		User user2=new User();
		user2.setName("张明2");
		user2.setSex("男2");
		userList.add(user2);
		Gson gson=new Gson();
		
		//泛型List转成Json
		java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<List<User>>() {
		  }.getType();
		  
		String jsonString=gson.toJson(userList,type);
		System.out.println(jsonString);
		
		System.out.println("-----------------------神奇的分割线------------------------");
		//简单对象的转换
		String test1=gson.toJson(user1);
		System.out.println(test1);
		
		System.out.println("-----------------------神奇的分割线------------------------");
		//json字符串转换成对象
//		String jsonString="[{"name":"张明","sex":"男"},{"name":"张明1","sex":"男1"},{"name":"张明2","sex":"男2"}]";
		List<User> userListJson=new ArrayList<User>(0);
		userListJson=gson.fromJson(jsonString,type);
		System.out.println("userListJson大小:"+userListJson.size());
		
		
	}
}

class User  implements  Serializable{
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 6076812081178059504L;
	private String name;
	private String sex;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	
}