基于Struts2.1 annotation的Interceptor代码实例

最新推荐文章于 2025-06-01 09:24:37 发布

kompin_dmx

最新推荐文章于 2025-06-01 09:24:37 发布

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文章标签： interceptor struts exception action string input

本文链接：https://blog.youkuaiyun.com/kompin_dmx/article/details/5992256

本文介绍如何在Struts2框架中实现自定义权限拦截器，并通过具体示例展示了如何配置struts.xml文件及编写相应的Action代码。此外，还讨论了如何根据不同场景灵活使用拦截器。

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/WEB-INF/lib/下包含以下jar包（但不只这两个）
struts2-core-2.1.6.jar
struts2-convention-plugin-2.1.6.jar

Interceptor代码如下：

package com.kompin.kind.action; import java.util.Map; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionInvocation; import com.opensymphony.xwork2.interceptor.AbstractInterceptor; public class AuthorityInterceptor extends AbstractInterceptor { @Override public String intercept(ActionInvocation invocation) throws Exception { System.out.println("Enter AuthorityInterceptor"); Map session = ActionContext.getContext().getSession(); Object userId = session.get("userId"); if (userId == null) { return "login"; } else { return invocation.invoke(); } } }

struts.xml文件配置如下：

<struts> <constant name="struts.118n.encoding" value="GBK"/> <constant name="struts.custom.i18n.resources" value="globalMessages"/> <constant name="struts.convention.action.mapAllMatches" value="true"/> <package name="kompinInterceptor" extends="struts-default"> <interceptors> <interceptor name="authority" class="com.kompin.kind.action.interceptor.AuthorityInterceptor"/> <interceptor-stack name="auctionStack"> <interceptor-ref name="defaultStack"/> <interceptor-ref name="authority"/> </interceptor-stack> </interceptors> <default-interceptor-ref name="auctionStack"/> <global-results> <result name="login">/WEB-INF/jsp/login.jsp</result> <result name="exception">/WEB-INF/jsp/error.jsp</result> </global-results> </package> </struts>

User action代码如下：

package com.kompin.kind.action; import java.util.List; import java.util.Map; import org.apache.struts2.ServletActionContext; import org.apache.struts2.convention.annotation.Action; import org.apache.struts2.convention.annotation.InterceptorRefs; import org.apache.struts2.convention.annotation.InterceptorRef; import org.apache.struts2.convention.annotation.ParentPackage; import org.apache.struts2.convention.annotation.Result; import org.apache.struts2.convention.annotation.Results; import com.kompin.kind.business.UserBean; import com.kompin.kind.service.UserService; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; @ParentPackage("kompinInterceptor") @InterceptorRefs({ @InterceptorRef("defaultStack") }) @Results({ @Result(name="login", location="/WEB-INF/jsp/login.jsp") }) public class UserAction extends ActionSupport { private Integer id; private String name; private String pass; private String email; private UserService userSvc; private List<UserBean> users; private UserBean user; @Action(value="/regist", results={ @Result(name="success", type="dispatcher", location="/WEB-INF/jsp/login.jsp") ,@Result(name="failure", type="dispatcher", location="/WEB-INF/jsp/failure.jsp") ,@Result(name="input", type="dispatcher", location="/WEB-INF/jsp/regist.jsp") } ) public String regist()throws Exception{ try { if(null == getName() ||null == getPass() || null == getEmail()){ return "input"; } if (userSvc.addUser(getName(), getPass(), getEmail()) > 0) { return "success"; } return "failure"; } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); throw new Exception("注册用户出现异常"); } } @Action(value="/proShowUser", interceptorRefs=@InterceptorRef("authority"), results={ @Result(name="success", type="dispatcher", location="/WEB-INF/jsp/viewUser.jsp") ,@Result(name="failure", type="dispatcher", location="/WEB-INF/jsp/failure.jsp") ,@Result(name="input", type="dispatcher", location="/WEB-INF/jsp/login.jsp") } ) public String show()throws Exception{ try { setUsers(userSvc.findAllUser()); return "success"; } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); throw new Exception("显示用户出现异常"); } } ...略... }

Kind action代码如下：

package com.kompin.kind.action; import java.util.List; import org.apache.struts2.ServletActionContext; import org.apache.struts2.convention.annotation.Action; import org.apache.struts2.convention.annotation.InterceptorRef; import org.apache.struts2.convention.annotation.InterceptorRefs; import org.apache.struts2.convention.annotation.ParentPackage; import org.apache.struts2.convention.annotation.Result; import org.apache.struts2.convention.annotation.Results; import com.kompin.kind.business.KindBean; import com.kompin.kind.service.KindService; import com.opensymphony.xwork2.ActionSupport; @ParentPackage("kompinInterceptor") @InterceptorRefs({ @InterceptorRef("auctionStack") }) @Results({ @Result(name="login", location="/WEB-INF/jsp/login.jsp") }) public class KindAction extends ActionSupport { private KindService kindSvc; private List kinds; private String kindName; private String kindDesc; private KindBean kind; /** * * @param kindSvc */ @Action(value="/proAddKind", results={ @Result(name="success", type="chain", location="proViewKind") ,@Result(name="failure", type="dispatcher", location="/WEB-INF/jsp/addKind.jsp") ,@Result(name="input", type="dispatcher", location="/WEB-INF/jsp/addKind.jsp") } ) public String addKind()throws Exception{ try { if (kindSvc.addKind(kindName, kindDesc) > 0) { return "success"; } return "input"; } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); return "input"; } } ...略... }

要点说明：

1. @ParentPackage("kompinInterceptor")必须和struts.xml的package的name一致，否则启动tomcat会报错：

"Unable to find interceptor class referenced by ref-name ..."

2. 如果Action中并不是所有的方法都要auctionStack拦截，参考UserAction的代码：

@InterceptorRefs({ @InterceptorRef("defaultStack") })

3. 如果Action中所有的方法都经过同一个拦截器拦截，，参考KindAction的代码：

@InterceptorRefs({ @InterceptorRef("auctionStack") })

4. 如果Action中的某些方法需要特定的拦截器拦截，参考UserAction的代码（请留意proShowUser的Action注解与regist的Action注解的不同点）：

@Action(value="/proShowUser", interceptorRefs=@InterceptorRef("authority"), results={ @Result(name="success", type="dispatcher", location="/WEB-INF/jsp/viewUser.jsp") ,@Result(name="failure", type="dispatcher", location="/WEB-INF/jsp/failure.jsp") ,@Result(name="input", type="dispatcher", location="/WEB-INF/jsp/login.jsp") } )

5. 留意<interceptor-stack name="auctionStack">的定义。