fastjson 之常见的数据类型与json的相互转换

时间:2021-06-09 03:15:11
public class FastJsonTest1
{ /**
* 数组转json格式字符串
*/
public void array2Json(){
String[] arr = {"bill","green","maks","jim"};
String jsonText = JSON.toJSONString(arr, true);
System.out.println("array2Json()方法:jsonText=="+jsonText);
// 输出结果:jsonText==["bill","green","maks","jim"]
} /**
* json格式字符串转数组
*/
public void json2Array(){
String jsonText = "[\"bill\",\"green\",\"maks\",\"jim\"]";
JSONArray jsonArr = JSON.parseArray(jsonText);
System.out.println("json2Array()方法:jsonArr=="+jsonArr);
// 输出结果:jsonArr==["bill","green","maks","jim"]
} /**
* 数组转json格式字符串
*/
public void array2Json2(){
User user1 = new User("P001","TOM",16);
User user2 = new User("P002","JACKSON",21);
User user3 = new User("P003","MARTIN",20);
User[] userArr = {user1,user2,user3};
String jsonText = JSON.toJSONString(userArr, true);
System.out.println("array2Json2()方法:jsonText=="+jsonText);
//输出结果:jsonText==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]
} /**
* json格式字符串转数组
*/
public void json2Array2(){
String jsonText = "[{\"age\":16,\"id\":\"P001\",\"name\":\"TOM\"},{\"age\":21,\"id\":\"P002\",\"name\":\"JACKSON\"},{\"age\":20,\"id\":\"P003\",\"name\":\"MARTIN\"}]";
JSONArray jsonArr = JSON.parseArray(jsonText);
System.out.println("json2Array2()方法:jsonArr=="+jsonArr);
// 输出结果:jsonArr==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]
} /**
* list集合转json格式字符串
*/
public void list2Json(){
List list = new ArrayList();
User user1 = new User("L001","TOM",16);
list.add(user1);
User user2 = new User("L002","JACKSON",21);
list.add(user2);
User user3 = new User("L003","MARTIN",20);
list.add(user3);
String jsonText = JSON.toJSONString(list, true);
System.out.println("list2Json()方法:jsonText=="+jsonText);
//输出结果:jsonText==[{"age":16,"id":"L001","name":"TOM"},{"age":21,"id":"L002","name":"JACKSON"},{"age":20,"id":"L003","name":"MARTIN"}]
} /**
* list集合转json格式字符串
*/
public void list2Json2(){
List list = new ArrayList();
Address address1 = new Address("广东省","深圳市","科苑南路","580053");
User user1 = new User("L001","TOM",16,address1);
list.add(user1);
Address address2 = new Address("江西省","南昌市","阳明路","330004");
User user2 = new User("L002","JACKSON",21,address2);
list.add(user2);
Address address3 = new Address("陕西省","西安市","长安南路","710114");
User user3 = new User("L003","MARTIN",20,address3);
list.add(user3);
String jsonText = JSON.toJSONString(list, true);
System.out.println("list2Json2()方法:jsonText=="+jsonText);
//输出结果:jsonText==[{"address":{"city":"深圳市","post":"580053","province":"广东省","street":"科苑南路"},"age":16,"id":"L001","name":"TOM"},{"address":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"age":21,"id":"L002","name":"JACKSON"},{"address":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"},"age":20,"id":"L003","name":"MARTIN"}]
} /**
* map转json格式字符串
*/
public void map2Json(){
Map map = new HashMap();
Address address1 = new Address("广东省","深圳市","科苑南路","580053");
map.put("address1", address1);
Address address2 = new Address("江西省","南昌市","阳明路","330004");
map.put("address2", address2);
Address address3 = new Address("陕西省","西安市","长安南路","710114");
map.put("address3", address3);
String jsonText = JSON.toJSONString(map, true);
System.out.println("map2Json()方法:jsonText=="+jsonText);
//输出结果:jsonText=={"address1":{"city":"深圳市","post":"580053","province":"广东省","street":"科苑南路"},"address2":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"address3":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"}}
} }