Java SpringBoot 使用拦截器作为权限控制的实现方法
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
<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
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
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
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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