零配置
?基于Struts2.1 annotation的Interceptor代码实例 收藏
查阅了网络上的文章，同时结合自己的实践，将今天的学习结果分享如下，欢迎大家拍砖。
/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：
?view plaincopy to clipboardprint?
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();??
????????}??
????}??
?
}?
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：
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<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"???
????????????????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：
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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...??
}?
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：
view plaincopy to clipboardprint?
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;??
??????
?????
????@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...??
}?
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;
?
?
?@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：
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@InterceptorRefs({??
?@InterceptorRef("defaultStack")??
})?
@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：
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@InterceptorRefs({??
????@InterceptorRef("auctionStack")??
})?
@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）：
view plaincopy to clipboardprint?
@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")??
????}??
)?
?@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。
