Struts与Spring集成方式（一）

        第一种集成原理：在Action中取得BeanFactory，通过BeanFactory取得业务逻辑对象

        当客户端向服务器发送请求时，由web.xml截取url，如果url符合一定的要求，则交给struts中的ActionServlet进行处理。struts-config.xml中由url字符串的不同，转发到不同的Action进行操作。在此操作时，会获取ActionForm参数，一同在Action中进行处理。因为Action中是与业务逻辑层打交道的一层，则在Action中会调用Spring中注入的bean（取得BeanFactory，得到bean），处理完后，返回action，通过forward转到相应的界面，将结果显示给客户端。

       看一下部分代码实现：

web.xml

<servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
  </servlet>

 
  <!-- Standard Action Servlet Mapping -->
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>	
  <context-param>
  	<param-name>contextConfigLocation</param-name>
  	<param-value>classpath:applicationContext-*.xml</param-value>
  </context-param>
  <!--如果你想要在自己所定义的Servlet类别中使用Spring的容器功能，则使用此监听器。ContextLoaderListener预设会读取applicationContext.xml，我们也可以指定自己的定义档，只要在<context-param>中指定contextConfigLocation参数。如上面context-param参数设定 -->
  <listener>
	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

struts-config.xml

<struts-config>

    <form-beans>

        <form-bean name="loginForm" type="com.bjpowernode.usermgr.web.forms.LoginActionForm"/>

    </form-beans>

    <action-mappings>

        <action path="/login"

                type="com.bjpowernode.usermgr.web.actions.LoginAction"

                name="loginForm"

                scope="request"

        >

            <forward name="success" path="/login_success.jsp"/>

        </action>

    </action-mappings>

    <message-resources parameter="MessageResources" />

</struts-config>

LoginActionForm.java

public class LoginActionForm extends ActionForm {

    private String username;

    private String password;

    public String getUsername() {

        returnusername;

    }

    publicvoid setUsername(String username) {

        this.username = username;

    }

    public String getPassword() {

        returnpassword;

    }

    publicvoid setPassword(String password) {

        this.password = password;

    }

}

LoginAction.java

public class LoginAction extends Action { 

    @Override

    public ActionForward execute(ActionMapping mapping, ActionForm form,

            HttpServletRequest request, HttpServletResponse response)

            throws Exception {

        LoginActionForm laf = (LoginActionForm)form;

        String username = laf.getUsername();

        String password = laf.getPassword();

        BeanFactory factory = WebApplicationContextUtils.getRequiredWebApplicationContext(request.getSession().getServletContext());

        UserManager userManager = (UserManager)factory.getBean("userManager");

        userManager.login(username, password);

        return mapping.findForward("success");

    }

}

applicationContext-beans.xml

<beanid="userManager"class="com.bjpowernode.usermgr.manager.UserManagerImpl"/>