google.son

输出：

{"id":1,"name":"llll","age":12,"pass":"sada"}

{"1":"A","2":"S","3":"F"}

++++++

{1=A, 2=S, 3=F}

{1=A, 2=S, 3=F}

[{"1":"A"},{"2":"AA"},{"3":"AD"}]

[2,3,4]

[1,2,3,4,4]

+++

[1, 2, 3, 4, 4]

[1, 2, 3, 4, 4]

[{"id":1,"name":"ll","age":12,"pass":"saddddda"},{"id":1,"name":"llssll","age":12,"pass":"saaaada"}]

+++++++++

[Person [id=1, name=ll, age=12, pass=saddddda], Person [id=1, name=llssll, age=12, pass=saaaada]]

[Person [id=1, name=ll, age=12, pass=saddddda], Person [id=1, name=llssll, age=12, pass=saaaada]]

-----------------

Person [id=1, name=llll, age=0, pass=sada]

"2016-7-5 17:04:55"

Tue Jul 05 17:04:55 CST 2016

import java.lang.reflect.Type;

import com.google.gson.Gson;

public class ObjectUtil {

    public static <T>  T getObjFromJsonByClazz(String json,Class <T> classz){
        Gson gson = new Gson(); 
        T t = gson.fromJson(json, classz);
        return t;
    }
    
    public static String getJsonFromObj(Object classz){
        Gson gson = new Gson(); 
        return gson.toJson(classz);
    }
    
    public static <T> T getObjeFromJsonByType(String json,Type type){
        Gson gson = new Gson(); 
        T t = gson.fromJson(json, type);
        return t;
    }
    
    public static Gson getGosn(){
        return new Gson(); 
    }
}

import java.lang.reflect.Type;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.gson.reflect.TypeToken;

import jdbc.model.Person;

public class JsonTest {

	/*
	 * {"id":1,"name":"llll","age":12,"pass":"sada"} {"1":"A","2":"S","3":"F"}
	 * [{"1":"A"},{"2":"AA"},{"3":"AD"}] [2,3,4] [1,2,3,4,4]
	 * [{"id":1,"name":"ll","age":12,"pass":"saddddda"},{"id":1,"name":"llssll",
	 * "age":12,"pass":"saaaada"}]
	 */
	public static void main(String[] args) {
		testPerson();
		testMap();
		testList();
		testListMap();
		testArray();
		testListPerson();
		System.out.println("-----------------");
		testfromPerson();
		testDateBeanJson();
	}

	private static void testfromPerson() {
		String s = "{'id':'1','name':'llll','pass':'sada'}";
		Person map = ObjectUtil.getObjFromJsonByClazz(s, Person.class);
		System.out.println(map);
	}

	public static void testListPerson() {
		List<Person> list = new ArrayList<>();
		Person p1 = new Person();
		p1.setAge(12);
		p1.setId(1);
		p1.setName("ll");
		p1.setPass("saddddda");

		Person p2 = new Person();
		p2.setAge(12);
		p2.setId(1);
		p2.setName("llssll");
		p2.setPass("saaaada");
		list.add(p1);
		list.add(p2);
		String s = ObjectUtil.getJsonFromObj(list);
		System.out.println(s);
		System.out.println("+++++++++");
		java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<List<Person>>() {
		}.getType();

		List<Person> list1 = new ArrayList<>();
		list1 = ObjectUtil.getGosn().fromJson(s, type);
		System.out.println(list1);
		
		List<Person> list2 = new ArrayList<>();
		list2 = ObjectUtil.getObjeFromJsonByType(s, type);
		System.out.println(list2);

	}

	public static void testArray() {
		int[] arr = new int[] { 1, 2, 3, 4, 4 };
		String s = ObjectUtil.getJsonFromObj(arr);
		System.out.println(s);
		System.out.println("+++");
		Type type = new TypeToken<int[]>() {
		}.getType();
		int[] arr1 ;
		arr1 = ObjectUtil.getGosn().fromJson(s, type);
		System.out.println(Arrays.toString(arr1));
		
		int[] arr2;
		arr2 = ObjectUtil.getObjeFromJsonByType(s, type);
		System.out.println(Arrays.toString(arr2));

	}

	public static void testListMap() {
		List<Integer> list = new ArrayList<>();
		list.add(2);
		list.add(3);
		list.add(4);
		String s = ObjectUtil.getJsonFromObj(list);
		System.out.println(s);

	}

	public static void testList() {
		List<Map<Integer, String>> list = new ArrayList<>();
		Map<Integer, String> map1 = new HashMap<>();
		map1.put(1, "A");
		Map<Integer, String> map2 = new HashMap<>();
		map2.put(2, "AA");
		Map<Integer, String> map3 = new HashMap<>();
		map3.put(3, "AD");
		list.add(map1);
		list.add(map2);
		list.add(map3);
		String s = ObjectUtil.getJsonFromObj(list);
		System.out.println(s);
	}

	public static void testMap() {
		Map<Integer, String> map = new HashMap<>();
		map.put(1, "A");
		map.put(2, "S");
		map.put(3, "F");
		String s = ObjectUtil.getJsonFromObj(map);
		System.out.println(s);
		System.out.println("++++++");

		java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<Map<Integer, String>>() {
		}.getType();
		Map<Integer, String> map1 = new HashMap<>();

		map1 = ObjectUtil.getGosn().fromJson(s, type);
		System.out.println(map1);
		
		Map<Integer, String> map2 = new HashMap<>();

		map2 = ObjectUtil.getObjeFromJsonByType(s, type);
		System.out.println(map2);

		
		
	}

	public static void testPerson() {
		Person p = new Person();
		p.setAge(12);
		p.setId(1);
		p.setName("llll");
		p.setPass("sada");
		String pstr = ObjectUtil.getJsonFromObj(p);
		System.out.println(pstr);
	}

	public static void testDateBeanJson() {

		// 日期Bean数据
		Date bean = new Date();
		// Bean(带日期属性) -> Json
		String json = ObjectUtil.getGosn().toJson(bean);
		System.out.println(json);

		java.lang.reflect.Type type =

		new com.google.gson.reflect.TypeToken<Date>() {
		}.getType();

		Date b = ObjectUtil.getGosn().fromJson(json, type);

		System.out.println(b);

	}

}