使用GSON工具实现json和其他数据格式间转换

  1 package gson;
  2
  3 import java.util.ArrayList;
  4 import java.util.List;
  5
  6 import com.google.gson.Gson;
  7 import com.google.gson.GsonBuilder;
  8 import com.google.gson.reflect.TypeToken;
  9
 10 /**
 11  * Gson：解析json工具基础用法加高级进阶
 12  *
 13  * ClassName: GsonUtils
 14  * TypeToken：只是为了提取泛型的类型而已
 15  * 控制缩进：final Gson gson = new GsonBuilder().setVersion(1.1).setPrettyPrinting().create();
 16  * 调用setPrettyPrinting方法，改变gson对象的默认行
 17  *
 18  * @Description: TODO
 19  * @author liuhl
 20  * @date 2018年3月1日
 21  */
 22 public class GsonUtils {
 23
 24     public static final Gson gson = new GsonBuilder().create();
 25
 26     /* 基本数据类型的解析 */
 27       int number = gson.fromJson("1", int.class);
 28       double money = gson.fromJson("800.25", double.class);
 29       boolean bool = gson.fromJson("true", boolean.class);
 30       String str = gson.fromJson("kele", String.class);
 31     /* 基本数据类型的解析 */
 32
 33     /* 基本数据类型的生成 */
 34      String istr = gson.toJson(1);
 35      String dstr = gson.toJson(9000.88);
 36      String bstr = gson.toJson("true");
 37      String str2 = gson.toJson("baihe");
 38     /* 基本数据类型的生成 */
 39
 40     /* 实体类的解析与生成 */
 41      Ticket ticket = new Ticket("2002", 33333.33, "1.1.230010", true);
 42      String json = gson.toJson(ticket);
 43      Ticket tick = gson.fromJson(json, Ticket.class);
 44     /* 实体类的解析与生成 */
 45
 46     /* json转为数组 */
 47      String jsonss = "['aa','bb','cc','dd']";
 48      String[] ss = gson.fromJson(jsonss, String[].class);
 49      String jsonsss = gson.toJson(ss);
 50     /* json转为数组 */
 51
 52     /* json <----> List */
 53      String ljson = "['username','age','data']";
 54      List<String> list = gson.fromJson(ljson, new TypeToken<List<String>>() {}.getType());
 55      String listjson = gson.toJson(list);
 56     /* json <----> List */
 57
 58     /* 泛型的使用 */
 59      User<Ticket> user = new User<Ticket>("10001", 25, ticket);
 60      String userjson = gson.toJson(user);
 61      User<Ticket> userticket = gson.fromJson(userjson, new TypeToken<User<Ticket>>() {}.getType());
 62     /* 泛型的使用 */
 63
 64
 65
 66
 67     public static void main(String[] args) {
 68         /*扩展*/
 69         List<Ticket> ticList = new ArrayList<>();
 70         ticList.add(new Ticket("3003", 444.444, "2.2.30003", false));
 71         ticList.add(new Ticket("4004", 444.444, "4.4.30003", true));
 72         ticList.add(new Ticket("5005", 444.444, "5.5.30003", false));
 73         ticList.add(new Ticket("6006", 444.444, "6.6.30003", true));
 74         ticList.add(new Ticket("7007", 444.444, "7.7.30003", false));
 75
 76         User<List<Ticket>> userlistTic = new User<List<Ticket>>("lhl", 28, ticList);
 77          String json = gson.toJson(userlistTic);
 78          User<List<Ticket>> ticuserList = gson.fromJson(json, new TypeToken<User<List<Ticket>>>(){}.getType());
 79          /*扩展*/
 80          System.out.println(ticuserList.age);
 81          System.out.println(ticuserList.usercode);
 82          for (Ticket ticket : ticuserList.data) {
 83             System.out.println(ticket.dealCode);
 84             System.out.println(ticket.instnCode);
 85             System.out.println(ticket.dealFlag);
 86             System.out.println(ticket.money);
 87         }
 88     }
 89 }