Struts使用拦截器完成权限控制实战

秒速五厘米 2021-07-24 13:16 372阅读 0赞

**一 视图**

1 loginForm.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@ taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>登录页面</title>
    </head>
    <body>
    <h3>用户登录</h3>
    ${tip}
    <s:form action="login">
        <s:textfield name="username" label="用户名"/>
        <s:password name="password" label="密码"/>
        <s:submit value="登录"/>
    </s:form>
    </body>
    </html>

2 viewBook.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>作者李刚已经出版的图书：</title>
        <meta name="website" content="http://www.crazyit.org"/>
    </head>
    <body>
    <h2>作者李刚已经出版的图书：</h2>
    轻量级Java EE企业应用实战<br/>
    疯狂iOS讲义<br/>
    疯狂Java讲义<br/>
    </body>
    </html>

3 welcome.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@ taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>成功页面</title>
    </head>
    <body>
        您已经登录!
        <a href="viewBook">查看图书</a>
    </body>
    </html>

4 error.jsp

**二 配置文件**

<?xml version="1.0" encoding="GBK"?>
    <!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">
    <struts>
        <constant name="struts.i18n.encoding" value="GBK"/>
    
        <package name="lee" extends="struts-default">
            
            <interceptors>
                
                <interceptor name="authority"
                    class="org.crazyit.app.interceptor.AuthorityInterceptor"/>
            </interceptors>
    
            
            <global-results>
                
                <result name="login">/WEB-INF/content/loginForm.jsp</result>
            </global-results>
    
            <action name="login" class="org.crazyit.app.action.LoginAction">
                <result name="error">/WEB-INF/content//error.jsp</result>
                <result>/WEB-INF/content/welcome.jsp</result>
            </action>
            
            <action name="viewBook">
                
                <result>/WEB-INF/content/viewBook.jsp</result>
                <interceptor-ref name="defaultStack"/>
                
                <interceptor-ref name="authority"/>
            </action>
            <action name="*">
                <result>/WEB-INF/content/{1}.jsp</result>
            </action>
        </package>
    </struts>

**三 action**

package org.crazyit.app.action;
    
    import com.opensymphony.xwork2.ActionSupport;
    import com.opensymphony.xwork2.ActionContext;
    
    import java.util.*;
    
    public class LoginAction extends ActionSupport
    {
        private String username;
        private String password;
    
        // username的setter和getter方法
        public void setUsername(String username)
        {
            this.username = username;
        }
        public String getUsername()
        {
            return this.username;
        }
    
        // password的setter和getter方法
        public void setPassword(String password)
        {
            this.password = password;
        }
        public String getPassword()
        {
            return this.password;
        }
    
        public String execute() throws Exception
        {
            System.out.println("进入execute方法执行体..........");
            if (getUsername().equals("crazyit.org")
                && getPassword().equals("leegang") )
            {
                ActionContext ctx = ActionContext.getContext();
                Map<String,Object> session = ctx.getSession();
                session.put("user" , getUsername());
                return SUCCESS;
            }
            return ERROR;
        }
    }

**四 拦截器**

package org.crazyit.app.interceptor;
    
    import com.opensymphony.xwork2.*;
    import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
    
    import java.util.*;
    
    
    // 权限检查拦截器继承AbstractInterceptor类
    public class AuthorityInterceptor
        extends AbstractInterceptor
    {
        // 拦截Action处理的拦截方法
        public String intercept(ActionInvocation invocation)
            throws Exception
        {
            // 取得请求相关的ActionContext实例
            ActionContext ctx = invocation.getInvocationContext();
            Map session = ctx.getSession();
            // 取出Session里的user属性
            String user = (String)session.get("user");
            //如果没有登录，或者登录所用的用户名不是crazyit.org，都返回重新登录
            if (user != null && user.equals("crazyit.org") )
            {
                return invocation.invoke();
            }
            // 如果没有登录，将服务器提示放入ActionContext中
            ctx.put("tip" ,"您还没有登录，请输入crazyit.org,leegang登录系统");
            // 返回login的逻辑视图
            return Action.LOGIN;
        }
    }

**五 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/89305057768349fca131a0b7fed57167.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/437576c29e1f44da98a692885a49d6a1.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2]: /images/20210724/93d1bea5b4a449af9989838281d91cf0.png