JSON conversion Tool Gson example one-Simple object conversions and list conversions with generics

Gson is a Java class library provided by Google for mapping between Java objects and JSON data. You can turn a JSON string into a Java object, or vice versa.

Jar and Source: http://code.google.com/p/google-gson/downloads/list

Entity class:

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2. Public class Student {
4. private int id;
6. private String name;
8. private Date BirthDay;
12. public int getId () {
14. return ID;
16. }
20. public void setId (int id) {
22. this.id = ID;
24. }
28. Public String GetName () {
30. return name;
32. }
36. public void SetName (String name) {
38. this.name = name;
40. }
44. Public Date Getbirthday () {
46. return BirthDay;
48. }
52. public void Setbirthday (Date birthDay) {
54. this.birthday = BirthDay;
56. }
60. @Override
62. Public String toString () {
64. return "Student [birthday=" + BirthDay + ", id=" + ID + ", name="
66. + name + "]";
68. }
72. }

Test class:

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2. Import java.util.ArrayList;
4. Import Java.util.Date;
6. Import java.util.List;
10. Import Com.google.gson.Gson;
12. Import Com.google.gson.reflect.TypeToken;
16. public class GsonTest1 {
20. public static void Main (string[] args) {
22. Gson Gson = new Gson ();
26. Student student1 = new Student ();
28. Student1.setid (1);
30. Student1.setname ("Kun");
32. Student1.setbirthday (New Date ());
36. // //////////////////////////////////////////////////////////
38. System.out.println ("----------conversions between simple objects-------------");
40. Simple Bean to JSON
42. String S1 = Gson.tojson (student1);
44. System.out.println ("Simple bean conversion to json===" + S1);
48. JSON to Simple bean
50. Student Student = Gson.fromjson (s1, Student.class);
52. SYSTEM.OUT.PRINTLN ("JSON to Simple bean===" + student);
54. Results:
56. Simple Bean converted to json==={"id": 1, "name": "Kun", "BirthDay": "June," 8:27:52 AM "}
58. JSON converted to simple bean===student [birthday=Fri June 08:27:52 CST, id=1,
60. name= Kun]
62. // //////////////////////////////////////////////////////////
66. Student student2 = new Student ();
68. Student2.setid (2);
70. Student2.setname ("Cao Guisheng");
72. Student2.setbirthday (New Date ());
76. Student student3 = new Student ();
78. Student3.setid (3);
80. Student3.setname ("Sharon");
82. Student3.setbirthday (New Date ());
86. List<Student> list = new ArrayList<Student> ();
88. List.add (STUDENT1);
90. List.add (Student2);
92. List.add (STUDENT3);
96. System.out.println ("-----------------------of conversions between lists with generics");
98. List with generics converted to JSON
100. String s2 = Gson.tojson (list);
102. System.out.println ("list with generics converted to json==" + s2);
106. JSON to a list with generics
108. List<Student> retlist = Gson.fromjson (s2,
110. New TypeToken<List<Student>> () {
112. }.gettype ());
114. for (Student stu:retlist) {
116. System.out.println (Stu);
118. }
122. Results:
124. List with generics converted to json==[{"id": 1, "name": "Kun", "BirthDay": "June," 8:28:52 AM "},{" id ": 2," name ":" Cao Guisheng "," BirthDay ": "June, 8:28:52 AM"},{"id": 3, "name": "Sharon", "BirthDay": June, 8:28:52 AM "}]
126. Student [birthday=Fri June 08:28:52 CST, id=1, name= kun]
128. Student [birthday=Fri June 08:28:52 CST, id=2, name= Cao Guisheng]
130. Student [birthday=Fri June 08:28:52 CST, id=3, name= Sharon]
134. }
136. }

Execution Result:

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2. ----------conversions between simple objects-------------
4. Simple Bean converted to json==={"id": 1, "name": "Kun", "BirthDay": "June," 9:10:31 PM "}
6. JSON converted to Simple bean===student [Birthday=fri June 21:10:31 CST, id=1, Name= Kun]
8. ----------conversions between lists with generics-------------
10. List with generics converted to json==[{"id": 1, "name": "Kun", "BirthDay": "June," "9:10:31 PM"},{"id": 2, "name": "Cao Guisheng", "BirthDay": "June 22 , 9:10:31 PM "},{" id ": 3," "Name": "Sharon", "BirthDay": "June," 9:10:31 pm "}]
12. Student [Birthday=fri June 21:10:31 CST, id=1, Name= Kun]
14. Student [Birthday=fri June 21:10:31 CST, id=2, name= Cao Guisheng]
16. Student [Birthday=fri June 21:10:31 CST, id=3, name= Sharon]

JSON conversion Tool Gson example one-Simple object conversion and list conversion with generics (http://blog.csdn.net/lk_blog/article/details/7685169)
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JSON conversion Tool Gson example five-special requirements processing in real development (http://blog.csdn.net/lk_blog/article/details/7685237)
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Instance code download: http://download.csdn.net/detail/lk_blog/4387822

JSON conversion Tool Gson example one-Simple object conversions and list conversions with generics