springmvc的拦截器实现基于url的拦截(权限管理)
使用基于url拦截的权限管理方式,实现起来比较简单,不依赖框架,使用web提供filter就可以实现。
问题:
需要将所有的url全部配置起来,有些繁琐,不易维护,url(资源)和权限表示方式不规范。
所以才有了shirohttps://blog.****.net/qq_38704184/article/details/83902113
1.web.xml
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:conf/spring-*.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
<!-- post乱码处理 -->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
2.spring-mvc.xml
<!-- handlermapping等组件 -->
<mvc:annotation-driven/>
<!-- 开启组件扫描,扫描Controller,Service -->
<context:component-scan base-package=""/>
<!-- 配置视图解析器 要求将jstl的包加到classpath -->
<!-- ViewResolver -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- 配置拦截器 -->
<mvc:interceptors>
<!-- 用户认证拦截 -->
<mvc:interceptor>
<!-- 拦截所有 -->
<mvc:mapping path="/**"/>
<bean class="com.xx.interceptor.LoginInterceptor"></bean>
</mvc:interceptor>
</mvc:interceptors>
3.spring-mybatis.xml
<!-- 定义DataSource -->
<bean id="dbcp"
class="org.apache.tomcat.dbcp.dbcp.BasicDataSource">
<property name="username" value="root">
</property>
<property name="password" value="123456">
</property>
<property name="driverClassName"
value="com.mysql.jdbc.Driver">
</property>
<property name="url"
value="jdbc:mysql:///shiro?useUnicode=true&characterEncoding=utf8">
</property>
</bean>
<!-- 定义SqlSessionFactoryBean -->
<bean id="ssf"
class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 指定dataSource -->
<property name="dataSource" ref="dbcp">
</property>
<!-- 指定SQL定义文件 -->
<property name="mapperLocations"
value="com.xx.mapper.*.xml"/>
</bean>
<!-- 定义MapperScanner -->
<bean id="mapperScanner"
class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 指定Mapper接口 -->
<property name="basePackage"
value="com.xx.mapper">
</property>
<!-- 指定SqlSessionFactory,省略 -->
</bean>
4.核心操作
public class LoginInterceptor implements HandlerInterceptor{
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
//在执行handler之前执行,用于用户认证、用户授权校验
//得到请求的URL
String url = request.getRequestURI();
//判断是否是公开地址
//实际开发的时候公开访问地址放在配置文件中
//读取配置文件中的公开URL
List<String> list = ResourcesUtil.gekeyList("commonURL");
//遍历公开地址,如果是公开地址就放行
for (String open_url : list) {
if(url.indexOf(open_url)>=0) {
return true;
}
}
//从配置文件中获取公用的访问地址
List<String> public_urls = ResourcesUtil.gekeyList("publicURL");
//遍历公开地址,如果是公开地址就放行
for (String public_url : public_urls) {
if(url.indexOf(public_url)>=0) {
//若果是公用地址就放行
return true;
}
}
//判断用户身份是否在Session中
HttpSession session = request.getSession();
ActiveUser activeUser = (ActiveUser) session.getAttribute("activeUser");
//如果用户存在就放行
if(activeUser != null) {
//从Session中取出权限范围的URL
List<SysPermission> permissions = activeUser.getPermissions();
for (SysPermission sysPermission : permissions) {
String url2 = sysPermission.getUrl();
if(url.indexOf(url2)>=0) {
//如果是权限允许的范围的地址就放行
return true;
}
}
}
//执行到这里,跳转到登录界面,用户进行认证
request.getRequestDispatcher("/WEB-INF/jsp/refuse.jsp").forward(request, response);
return false;
}
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
// TODO Auto-generated method stub
}
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
// TODO Auto-generated method stub
}
}
要知道当发出请求的一瞬间,请求首先进入的是拦截器,之后再进入所谓的方法体中
5.处理请求
@RequestMapping("/login")
public String login(HttpSession session,String usercode,String password,String randomcode) throws Exception {
//获取验证码
String validateCode =
(String) session.getAttribute("validateCode");
if(!randomcode.equals(validateCode)) {
return "redirect:/loginPage.action";
}
//调用Service方法执行登录认证
ActiveUser user = sysService.authenticat(usercode, password);
session.setAttribute("activeUser", user);
return "redirect:/first.action";
}
不在多解释,不在多书写,看的人没几个(行内人一看代码就明白意思)