1  1 package gson;
 2  2 
 3  3 import java.util.ArrayList;
 4  4 import java.util.List;
 5  5 
 6  6 import com.google.gson.Gson;
 7  7 import com.google.gson.GsonBuilder;
 8  8 import com.google.gson.reflect.TypeToken;
 9  9 
10 10 /**
11 11  * Gson：解析json工具基礎用法加高級進階
12 12  * 
13 13  * ClassName: GsonUtils
 
14 14  * TypeToken：只是為了提取泛型的類型而已
15 15  * 控制縮進：final Gson gson = new GsonBuilder().setVersion(1.1).setPrettyPrinting().create();
16 16  * 調用setPrettyPrinting方法，改變gson對象的默認行
17 17  * 
18 18  * @Description: TODO
19 19  * @author liuhl
20 20  * @date 2018年3月1日
21 21  */
22 22 public class GsonUtils {
23 23 
24
 
 24     public static final Gson gson = new GsonBuilder().create();
25 25 
26 26     /* 基本數據類型的解析 */
27 27       int number = gson.fromJson("1", int.class);
28 28       double money = gson.fromJson("800.25", double.class);
29 29       boolean bool = gson.fromJson("true", boolean.class);
30 30       String str = gson.fromJson("kele", String.class
 
);
31 31     /* 基本數據類型的解析 */
32 32 
33 33     /* 基本數據類型的生成 */
34 34      String istr = gson.toJson(1);
35 35      String dstr = gson.toJson(9000.88);
36 36      String bstr = gson.toJson("true");
37 37      String str2 = gson.toJson("baihe");
38 38     /* 基本數據類型的生成 */
39 39 
40 40     /* 實體類的解析與生成 */
41 41      Ticket ticket = new Ticket("2002", 33333.33, "1.1.230010", true);
42 42      String json = gson.toJson(ticket);
43 43      Ticket tick = gson.fromJson(json, Ticket.class);
44 44     /* 實體類的解析與生成 */
45 45 
46 46     /* json轉為數組 */
47 47      String jsonss = "[‘aa‘,‘bb‘,‘cc‘,‘dd‘]";
48 48      String[] ss = gson.fromJson(jsonss, String[].class);
49 49      String jsonsss = gson.toJson(ss);
50 50     /* json轉為數組 */
51 51 
52 52     /* json <----> List */
53 53      String ljson = "[‘username‘,‘age‘,‘data‘]";
54 54      List<String> list = gson.fromJson(ljson, new TypeToken<List<String>>() {}.getType());
55 55      String listjson = gson.toJson(list);
56 56     /* json <----> List */
57 57 
58 58     /* 泛型的使用 */
59 59      User<Ticket> user = new User<Ticket>("10001", 25, ticket);
60 60      String userjson = gson.toJson(user);
61 61      User<Ticket> userticket = gson.fromJson(userjson, new TypeToken<User<Ticket>>() {}.getType());
62 62     /* 泛型的使用 */
63 63     
64 64     
65 65     
66 66     
67 67     public static void main(String[] args) {
68 68         /*擴展*/
69 69         List<Ticket> ticList = new ArrayList<>();
70 70         ticList.add(new Ticket("3003", 444.444, "2.2.30003", false));
71 71         ticList.add(new Ticket("4004", 444.444, "4.4.30003", true));
72 72         ticList.add(new Ticket("5005", 444.444, "5.5.30003", false));
73 73         ticList.add(new Ticket("6006", 444.444, "6.6.30003", true));
74 74         ticList.add(new Ticket("7007", 444.444, "7.7.30003", false));
75 75         
76 76         User<List<Ticket>> userlistTic = new User<List<Ticket>>("lhl", 28, ticList);
77 77          String json = gson.toJson(userlistTic);
78 78          User<List<Ticket>> ticuserList = gson.fromJson(json, new TypeToken<User<List<Ticket>>>(){}.getType());
79 79          /*擴展*/
80 80          System.out.println(ticuserList.age);
81 81          System.out.println(ticuserList.usercode);
82 82          for (Ticket ticket : ticuserList.data) {
83 83             System.out.println(ticket.dealCode);
84 84             System.out.println(ticket.instnCode);
85 85             System.out.println(ticket.dealFlag);
86 86             System.out.println(ticket.money);
87 87         }
88 88     }
89 89 }
90  

解析工具Gson源碼讀後感，真實項目開發經驗總結