Assigning values from a bean in a spring configuration file

Basic data type assignment-through the property in the bean in the spring configuration file

Extension-In this way you can assign a value to a property that is configured to connect data

1, if it is a basic data type, you can set the initial value of the property in the object by setter method, apply: You can write something that was previously written in DBC.

2. If the type of the attribute is not a base type or String, you can assign a value to the object using a reference (ref in the property in The bean)

Extension-In this way, the connection value of the database can be assigned to the implementation class

3, set the value of the property, note to initialize the collection. The basic data type is not initialized because it is initialized by default (infrequently used)

4, by the construction method for the property assignment (not commonly used, usually using Setter method Assignment)

5. Automatic binding of attributes (not commonly used)

(1)byname

(2)Bytype

(3)AutoDetect, press byname First, then press bytype

Example:

1. Create a user class

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2. Public class User {
4. private String userid;
6. private String username;
8. private int age;
12. public int getage () {
14. return age;
16. }
20. public void Setage (int.) {
22. this.age = age;
24. }
28. Public String GetUserid () {
30. return userid;
32. }
36. public void Setuserid (String userid) {
38. This.userid = userid;
40. }
44. Public String GetUserName () {
46. return username;
48. }
52. public void Setusername (String username) {
54. this.username = Username;
56. }
58. }

2. In the configuration file

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4. <Bean id="user" class="Org.liky.spring.pojo.User">
6. <!--can initialize data for a property through the setter method of the property -
8. < name="userid" value="abc"> </Property>
10. </Bean>

3. Test procedures

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1. ApplicationContext context = new Classpathxmlapplicationcontext (
2. "Applicationcontext.xml");
4. User user = (user) Context.getbean ("user");
5. System.out.println (User.getuserid ());
6. System.out.println (new User (). GetUserid ());

Assigning values from a bean in a spring configuration file