如何实现
首先拦截器是属于web这块的，那我们需要引入springboot web模块，具体版本在parent中
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<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> |
然后我们在config目录下新建interceptor目录，用来放拦截器
我们新建两个拦截器，一个用来登陆拦截，一个用来进行管理员拦截。 登陆拦截不必多说，就是判断除登陆请求外所有请求是否登陆过，没有我们就截断请求，然会返回失败状态 管理员拦截，拦截的是管理员才能访问的资源，比如用户管理/权限管理等，它是登陆拦截放行后才能进行的， 就像关卡是一关一关的。登陆验证后进入管理员验证，判断该登陆用户是否具有管理员权限，若拥有则放行，否则拦截并返回失败状态 拦截器的核心是实现 org.springframework.web.servlet.HandlerInterceptor 接口，验证逻辑一般写在 preHandle 方法中，在请求资源前 我的验证逻辑比较简单，登陆验证就是从session中取出用户信息，判断是否存在，用户信息是登陆成功时放入session中的，大家也可以使用JWT验证 管理员验证也是从session中取出管理员信息，判断是否是管理员，管理员信息是登陆成功时将是否是管理员的信息放入session中的，大家也可以使用JWT验证登陆拦截器
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package com.example.interceptor_demo.config.interceptor;
import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.PrintWriter; import java.util.HashMap; import java.util.Map; /** * 拦截器，登录检查 */ @Component public class LoginInterceptor implements HandlerInterceptor {
@Autowired private HttpSession session;
@Autowired private ObjectMapper objectMapper;
@Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Object user = session.getAttribute( "sessionUser" ); if (sessionUser!= null ){ return true ; } else { Map<String,Object> notLogin = new HashMap<>(); notLogin.put( "msg" , "not login" ); notLogin.put( "code" , 403 ); notLogin.put( "data" , null ); try (PrintWriter printWriter = response.getWriter()){ printWriter.print(objectMapper.writeValueAsString(notLogin)); } catch (Exception e){ e.printStackTrace(); } return false ; } }
@Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { }
} |
管理员拦截器
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package com.example.interceptor_demo.config.interceptor;
import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.PrintWriter; import java.util.HashMap; import java.util.Map; /** * 拦截器，管理员验证 */ @Component public class AdminInterceptor implements HandlerInterceptor {
@Autowired private HttpSession session;
@Autowired private ObjectMapper objectMapper;
@Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Boolean isAdmin = (Boolean)session.getAttribute( "sessionAdmin" ); if (isAdmin!= null && isAdmin){ return true ; } else { Map<String,Object> notLogin = new HashMap<>(); notLogin.put( "msg" , "no power" ); notLogin.put( "code" , 403 ); notLogin.put( "data" , null ); try (PrintWriter printWriter = response.getWriter()){ printWriter.print(objectMapper.writeValueAsString(notLogin)); } catch (Exception e){ e.printStackTrace(); } return false ; } }
@Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { }
} |
最后我们在config目录下新建WebMvcConfig类，用来注册拦截器
拦截器注册类的核心是实现 org.springframework.web.servlet.config.annotation.WebMvcConfigurer 接口 实现 addInterceptors 方法，参数 registry 对象可用来注册拦截器 registry.addInterceptor() 方法用来添加拦截器 .addPathPatterns() 方法是为该拦截器添加拦截资源路径 .excludePathPatterns() 方法是为该拦截器添加要放行的资源路径 其中 * 代表路径下任意名称，** 代表任意路径下任意名称
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package com.example.interceptor_demo.config;
import com.example.interceptor_demo.config.interceptor.AdminInterceptor; import com.example.interceptor_demo.config.interceptor.LoginInterceptor; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration public class WebMvcConfig implements WebMvcConfigurer {
@Autowired private LoginInterceptor loginInterceptor;
@Autowired private AdminInterceptor adminInterceptor;
@Override public void addInterceptors(InterceptorRegistry registry) { this .loginInterceptor(registry); //登录拦截 this .adminInterceptor(registry); //管理员拦截 }
private void loginInterceptor(InterceptorRegistry registry){ registry.addInterceptor(loginInterceptor) .addPathPatterns( "/**" ) .excludePathPatterns( //释放登陆接口 "/login/**" ); }
private void adminInterceptor(InterceptorRegistry registry){ registry.addInterceptor(htmlPageInterceptor) .addPathPatterns( "/admin/**" ); //拦截管理员接口 } } |
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原文链接：https://www.cnblogs.com/New-HackerHK/p/15176720.html#4950599
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