Gson的简单使用
package test; import com.google.gson.Gson; import com.google.gson.reflect.TypeToken; import java.util.ArrayList; import java.util.Iterator; import java.util.List; /** * @author */ public class GsonTest { public static void main(String args[]){ //parseJSONObject(); //parseJSONArray(); // createJSONObject(); // createJSONArray(); } /** * 解析JSON 对象 */ public static void parseJSONObject(){ String json = "{'name':'张三', 'age':25}"; Gson gson = new Gson(); User user = gson.fromJson(json, User.class); System.out.println(user); } /** * 生成JSON对象 */ public static void createJSONObject(){ Gson gson = new Gson(); User user = new User(); user.name = "测试"; user.age = 100; String json = gson.toJson(user); System.out.println(json); } /** * 解析JOSN数组 */ public static void parseJSONArray(){ String json = "[{'name':'张三', 'age':25},{'name':'李四', 'age':25}]"; Gson gson = new Gson(); List<User> list = gson.fromJson(json, new TypeToken<List<User>>(){}.getType()); Iterator<User> iter = list.iterator(); while(iter.hasNext()){ User user = iter.next(); System.out.println(user); } } /** * 生成JSON数组 */ public static void createJSONArray(){ Gson gson = new Gson(); List<User> list = new ArrayList<>(); User user = new User(); user.name = "张三"; user.age = 100; list.add(user); user = new User(); user.name = "李四"; user.age = 200; list.add(user); String json = gson.toJson(list, new TypeToken<List<User>>(){}.getType()); System.out.println(json); } final static class User{ public String name; public int age; @Override public String toString(){ return "Nmae:"+name+"\tAge:"+age; } } }