自定义拦截器，当输入为指定的用户名和密码的时候允许登录，否则返回登录页面进行登录。

package Interceptor; import java.util.Map; import com.opensymphony.xwork2.ActionInvocation; import com.opensymphony.xwork2.interceptor.Interceptor; public class LoginInterceptor implements Interceptor { private String username; private String password; private String interceptorName; public String getInterceptorName() { return interceptorName; } public void setInterceptorName(String interceptorName) { this.interceptorName = interceptorName; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public void destroy() { } public void init() { } public String intercept(ActionInvocation invocation) throws Exception { System.out.println(interceptorName+":进入拦截器"); Map request = (Map)invocation.getInvocationContext().get("request"); String username = (String)request.get("username"); String password = (String)request.get("password"); if (null != username && username.equals("xxx") && password.equals("123456")) { System.out.println(interceptorName+":合法用户登录"); return invocation.invoke(); } else { System.out.println(interceptorName+":非法用户登录"); return "login"; } } }