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Springboot项目怎么使用拦截器
1. 创建一个拦截器并实现HandlerInterceptor接口
package com.leiyuan.bs.interceptor;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
// 拦截器
public class MyHandlerInterceptor implements HandlerInterceptor {
/**
* 拦截（Controller方法调用之前）
*
* @param request request
* @param response response
* @param o o
* @return 通过与否
* @throws Exception 异常处理
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object
o) throws Exception {
// TODO 我这里是通过用户是否登陆进行拦截，我的用户信息存储在session中，名称为userSession，大家可以自行实现
if (request.getSession().getAttribute("userSession") == null) {
// 拦截至登陆页面
request.getRequestDispatcher("/user/toLogin").forward(request, response);
// false为不通过
return false;
}
// true为通过
return true;
}
// 此方法为处理请求之后调用（调用过controller方法之后，跳转视图之前）
@Override
public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o,
ModelAndView modelAndView) throws Exception {
}
// 此方法为整个请求结束之后进行调用
@Override
public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
Object o, Exception e) throws Exception {
}
}
2. 创建一个配置类MyHandlerInterceptorConfig并继承WebMvcConfigurerAdapter类重写addInterceptors(InterceptorRegistry registry)方法
package com.leiyuan.bs;
import com.leiyuan.bs.interceptor.MyHandlerInterceptor;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
// 拦截器配置类
@Component
public class MyHandlerInterceptorConfig extends WebMvcConfigurerAdapter {
@Override
public void addInterceptors(InterceptorRegistry registry) {
/**
* 这里的addPathPatterns("/**")为配置需要拦截的方法“/**”代表所有，而后excludePathPatterns("/user/toLogin")等方法为排除哪些方法不进行 拦截
*/
registry.addInterceptor(new MyHandlerInterceptor()).addPathPatterns("/**").excludePathPatterns("/user/toLogin").excludePathPatterns
("/user/login").excludePathPatterns("/user/toNewUser").excludePathPatterns("/user/newUser");
super.addInterceptors(registry);
}
}
