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;
@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;
@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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