Cainiao developed by Struts2 + Spring2 can definitely understand the user logon Program (2)

Integrate struts2 with spring and use spring's core functions to implement dependency injection.

Spring:

The bean that should be configured in the configuration file is responsible for instantiating the object member attributes of the corresponding class:

1: import the basic two packages of spring dependency in the original struts2 project:

Spring-2.5.5.jar and struts2-spring-plugin-2.0.9.jar (because jar is too large, please download it on your own)

2: Add spring features to the project and add them to web. xml.

<Context-param>

<Param-name> contextConfigLocation </param-name>

<Param-value> classpath: applicationContext. xml </param-value>

</Context-param>

<Listener>

<Listener-class> org. springframework. web. context. ContextLoaderListener </listener-class>

</Listener>

3: remove the instantiation operation of several object members in the corresponding class in the struts project and only retain the interface.

Change

Private UserService userservice;

Private UserDao userdao;

And you must create getter and setter for them respectively.

4: add it to the spring configuration file

<Bean id = "loginAction" class = "org. action. CheckLogin">

<Property name = "userservice">

<Ref bean = "userservice"/>

</Property>

</Bean>

<Bean id = "userservice" class = "org. service. impl. UserServiceImpl">

<Property name = "userdao">

<Ref bean = "userdao"/>

</Property>

</Bean>

<Bean id = "userdao" class = "org. dao. impl. UserDaoImpl">

</Bean>

Note that these beans are dependent in sequence. They initialize several attribute members not initialized in the three classes,

This step removes the need to perform UserService userservice = new UserServiceImpl () in the class file.

5: called by action in the struts configuration file

<Action name = "login" class = "loginAction">