struts2 拦截器

最新推荐文章于 2023-04-30 00:38:07 发布

柠檬不萌耶

最新推荐文章于 2023-04-30 00:38:07 发布

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本文链接：https://blog.youkuaiyun.com/qq_36074150/article/details/78341963

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本文介绍了一个使用Struts2框架的实战案例，包括了配置文件pom.xml、struts.xml等的详细设置，演示了如何通过拦截器实现登录验证功能，并展示了具体的action类如LoginAction与BookAction的实现细节。

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pom.xml

<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.3</version>
    <scope>test</scope>
</dependency>

<!--获取ServletAPI-->
<dependency>
    <groupId>javaee</groupId>
    <artifactId>javaee-api</artifactId>
    <version>5</version>
</dependency>

<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-core</artifactId>
    <version>2.3.4.1</version>
</dependency>

<dependency>
    <groupId>org.apache.struts.xwork</groupId>
    <artifactId>xwork-core</artifactId>
    <version>2.3.4.1</version>
</dependency>

web.xml

<filter>
  <filter-name>struts2</filter-name>
  <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>struts2</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

  action

BookAction类public class BookAction implements Action {
    public String execute() throws Exception {
        System.out.println("bookaction-----------------");
        return SUCCESS;
    }
}
LoginAction类public class LoginAction implements Action {
    private UserInfo userInfo;
    public String execute() throws Exception {
        Map<String,Object> session= ActionContext.getContext().getSession();
        if(userInfo!=null){
            if(userInfo.getUsername().equals("1")&&userInfo.getPassword().equals("1")){
                //记录session
                session.put("uname",userInfo.getUsername());
                return SUCCESS;
            }else {
                return LOGIN;
            }
        }else {
            //不是从页面过来的
            if(session!=null&&session.get("uname")!=null){
                return "success";
            }else {
                System.out.println("Action 中的自定义代码");
                return "login";
            }
        }
    }

    public UserInfo getUserInfo() {
        return userInfo;
    }

    public void setUserInfo(UserInfo userInfo) {
        this.userInfo = userInfo;
    }
}
entity

UserInfo类public class UserInfo {
    private String username;
    private String password;

    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;
    }
}
Interceptor
MyInterceptor类public class MyInterceptor implements Interceptor {
    public void destroy() {
    }
    public void init() {
        System.out.println("拦截器已经成功初始化。。。。。。。。。。。。。。。。");
    }
    public String intercept(ActionInvocation actionInvocation) throws Exception {
        System.out.println("对象"+actionInvocation);
        Object  action=actionInvocation.getAction();
        System.out.println("action==========="+action);
        String  value;
        //判定Session里面key值对应的value是否存在
        Map<String,Object> session= ActionContext.getContext().getSession();
        Object name=session.get("uname");
        String actionnmae=actionInvocation.getProxy().getActionName();
        actionInvocation.getProxy().getNamespace();  //user
        System.out.println("actionname--------"+actionnmae);
        if(actionnmae.equals("login")){
            System.out.println("*********************action是login");
            //user/login.action
            value=actionInvocation.invoke();
        }else if(name!=null){
            //已经登陆，放行
            value=actionInvocation.invoke();
            String  method=actionInvocation.getProxy().getMethod();
            System.out.println("方法：==="+value);
        }else {
            value="login";
        }
        System.out.println("逻辑视图名"+value);
        return value;
    }
}
struts-day06.xml<struts>
    <constant name="struts.devMode" value="true"></constant>
    <package name="day06" namespace="/" extends="default">
        <action name="login" class="cn.struts.day06.action.LoginAction">
            <result name="success">/WEB-INF/myinter/success.jsp</result>
            <result name="login">/WEB-INF/myinter/login.jsp</result>
        </action>

        <action name="book" class="cn.struts.day06.action.BookAction">
            <result name="success">/WEB-INF/myinter/booksuccess.jsp</result>
        </action>
        </package>
        </struts>
struts.xml 
<struts>
<constant name="struts.devMode" value="true"></constant>
    <package name="default" namespace="/" extends="struts-default">
        <interceptors>
            <interceptor name="myInter" class="cn.struts.day06.Interceptor.MyInterceptor"></interceptor>
            <interceptor-stack name="myStack">
                <interceptor-ref name="defaultStack"></interceptor-ref>
                <interceptor-ref name="myInter"></interceptor-ref>
            </interceptor-stack>
        </interceptors>

        <default-interceptor-ref name="myStack"></default-interceptor-ref>

        <default-action-ref name="first"></default-action-ref>

        <action name="first"></action>

    </package>


<!--<include file="struts-day02.xml"></include>
<include file="struts-day03.xml"></include>
<include file="struts-day04.xml"></include>
<include file="struts-day05.xml"></include>-->
<include file="struts-day06.xml"></include>
</struts>
login.jsp<body>
<h2>登陆234</h2>
<s:form method="POST" action="login">
    请输入用户名<s:textfield name="userInfo.username"></s:textfield>
<s:textfield name="userInfo.password"></s:textfield><br/>
    <s:submit value="登陆"></s:submit>
</s:form>
</body>
success.jsp<head>
    <title>Title</title>
</head>
<body>
<h2>success!!!!</h2>
</body>