spring boot 拦截器

spring boot拦截器 完成这个演示只需要三个文件 

第一个 拦截器配置 MvcConfigurer.java

@Configuration
public class MvcConfigurer implements WebMvcConfigurer {

    //拦截器
    @Override
    public void addInterceptors(InterceptorRegistry interceptorRegistry) {
        //给指定url增加拦截器 可将要拦截的Url搭配通配符写在配置文件中 /Index/**
        interceptorRegistry.addInterceptor(new FilterHandler()).addPathPatterns("/a");
    }

    //.....其他更多全局定制实现方法  
}

第二个 拦截器逻辑 FilterHandler.java

public class FilterHandler implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        //在调用controller方法之前会调用此方法

        //重定向到/c
        httpServletResponse.sendRedirect("/c");
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        //在调用controller方法之后会调用此方法
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        //页面渲染完毕后会调用此方法
    }
}

第三个 业务访问控制层 IndexController

@Controller
public class IndexController {

    @RequestMapping("/a")
    @ResponseBody
    public String a(){
        return "这是a方法";
    }

    @RequestMapping("/b")
    @ResponseBody
    public String b(){
        return "这是b方法";
    }

    @RequestMapping("/c")
    @ResponseBody
    public String c(){
        return "这是c方法 请你登陆";
    }
}

运行效果

 本篇博客码云地址：https://gitee.com/zhao-baolin/springboot_interceptor