About the Gson of JSON

Source: Internet
Author: User
Tags tojson

The following is a copy of the paste from the csdn, it feels very clear to write

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

[Java]View Plaincopy
  1. Public class Student {
  2. private int id;
  3. private String name;
  4. private Date BirthDay;
  5. public int getId () {
  6. return ID;
  7. }
  8. public void setId (int id) {
  9. this.id = ID;
  10. }
  11. Public String GetName () {
  12. return name;
  13. }
  14. public void SetName (String name) {
  15. this.name = name;
  16. }
  17. Public Date Getbirthday () {
  18. return BirthDay;
  19. }
  20. public void Setbirthday (Date birthDay) {
  21. this.birthday = BirthDay;
  22. }
  23. @Override
  24. Public String toString () {
  25. return "Student [birthday=" + BirthDay + ", id=" + ID + ", name="
  26. + name + "]";
  27. }
  28. }


Test class:

[HTML]View Plaincopy
  1. Import java.util.ArrayList;
  2. Import Java.util.Date;
  3. Import java.util.List;
  4. Import Com.google.gson.Gson;
  5. Import Com.google.gson.reflect.TypeToken;
  6. public class GsonTest1 {
  7. public static void Main (string[] args) {
  8. Gson Gson = new Gson ();
  9. Student student1 = new Student ();
  10. Student1.setid (1);
  11. Student1.setname ("Kun");
  12. Student1.setbirthday (New Date ());
  13. // //////////////////////////////////////////////////////////
  14. System.out.println ("----------conversions between simple objects-------------");
  15. Simple Bean to JSON
  16. String S1 = Gson.tojson (student1);
  17. System.out.println ("Simple bean conversion to json===" + S1);
  18. JSON to Simple bean
  19. Student Student = Gson.fromjson (s1, Student.class);
  20. SYSTEM.OUT.PRINTLN ("JSON to Simple bean===" + student);
  21. Results:
  22. Simple Bean converted to json==={"id": 1, "name": "Kun", "BirthDay": "June," 8:27:52 AM "}
  23. JSON converted to simple bean===student [birthday=Fri June 08:27:52 CST, id=1,
  24. name= Kun]
  25. // //////////////////////////////////////////////////////////
  26. Student student2 = new Student ();
  27. Student2.setid (2);
  28. Student2.setname ("Cao Guisheng");
  29. Student2.setbirthday (New Date ());
  30. Student student3 = new Student ();
  31. Student3.setid (3);
  32. Student3.setname ("Sharon");
  33. Student3.setbirthday (New Date ());
  34. List<Student> list = new ArrayList<Student> ();
  35. List.add (STUDENT1);
  36. List.add (Student2);
  37. List.add (STUDENT3);
  38. System.out.println ("-----------------------of conversions between lists with generics");
  39. List with generics converted to JSON
  40. String s2 = Gson.tojson (list);
  41. System.out.println ("list with generics converted to json==" + s2);
  42. JSON to a list with generics
  43. List<Student> retlist = Gson.fromjson (s2,
  44. New TypeToken<List<Student>> () {
  45. }.gettype ());
  46. for (Student stu:retlist) {
  47. System.out.println (Stu);
  48. }
  49. Results:
  50. 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 "}]
  51. Student [birthday=Fri June 08:28:52 CST, id=1, name= kun]
  52. Student [birthday=Fri June 08:28:52 CST, id=2, name= Cao Guisheng]
  53. Student [birthday=Fri June 08:28:52 CST, id=3, name= Sharon]
  54. }
  55. }


Execution Result:

[Plain]View Plaincopy
    1. ----------conversions between simple objects-------------
    2. Simple Bean converted to json==={"id": 1, "name": "Kun", "BirthDay": "June," 9:10:31 PM "}
    3. JSON converted to Simple bean===student [Birthday=fri June 21:10:31 CST, id=1, Name= Kun]
    4. ----------conversions between lists with generics-------------
    5. 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 "}]
    6. Student [Birthday=fri June 21:10:31 CST, id=1, Name= Kun]
    7. Student [Birthday=fri June 21:10:31 CST, id=2, name= Cao Guisheng]
    8. Student [Birthday=fri June 21:10:31 CST, id=3, name= Sharon]

About the Gson of JSON

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