【1】struts.xml:
<!-- define an interceptor--> <interceptors> <interceptor name="authority" class="org.interceptot.LoginInterceptor"> </interceptor> <!-- Interceptor stack --> <interceptor-stack name="mydefault"> <interceptor-ref name="defaultStack" /> <interceptor-ref name="authority" /> </interceptor-stack> </interceptors> <!-- Define global Result --> <global-results> <!-- When the login view name is returned, go to the /login.jsp page--> <result name="login">/login.jsp</result> </global-results> <action name="show" class="org.action.showAction"> <result name="success">/main.jsp</result> <!-- use this interceptor--> <interceptor-ref name="mydefault" /> </action> <!--Verify login user information--> <action name="login" class="org.action.loginAction" method="execute"> <result name="error">/login.jsp</result> <result name="input">/login.jsp</result> </action>
[2] Custom interceptor org.interceptot.LoginInterceptor:
package org.interceptot; import java.util.Map; import com.opensymphony.xwork2.Action; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionInvocation; import com.opensymphony.xwork2.interceptor.AbstractInterceptor; public class LoginInterceptor extends AbstractInterceptor { @Override public String intercept(ActionInvocation invocation) throws Exception { // Get the ActionContext instance related to the request ActionContext ctx = invocation.getInvocationContext(); Map session = ctx.getSession(); String user = (String) session.get("username"); // If there is no login, that is, the user name does not exist, return to re-login System.out.println("user:"+user); if (user != null) { System.out.println("test"); return invocation.invoke(); } System.out.println("You are not logged in yet"); ctx.put("tip", "You are not logged in"); return Action.LOGIN; //Return a result called login } }
[3] Enter the Action on the main page: org.action.showAction
package org.action; import com.opensymphony.xwork2.ActionSupport; public class showAction extends ActionSupport { public String execute() { return "success"; } }
【4】LoginAction:
private boolean isInvalid(String value) { return (value == null || value.length() == 0); } if (isInvalid(user.getUsername())) return INPUT; if (isInvalid(user.getPassword())) return INPUT; //The login is successful and the User is put into the session HttpServletRequest request = ServletActionContext.getRequest(); Map map=ActionContext.getContext().getSession(); map.put("username", user.getUsername());
Reprinted from http://blog.sina.com.cn/s/blog_77cb836301015m3y.html