spring boot 攔截器

spring boot攔截器 完成這個演示只需要三個檔案 

 

第一個 攔截器配置 MvcConfigurer.java

@Configuration
public class MvcConfigurer implements WebMvcConfigurer {

    //攔截器
    @Override
    public void addInterceptors(InterceptorRegistry interceptorRegistry) {
        //給指定url增加攔截器 可將要攔截的Url搭配萬用字元寫在配置檔案中 /Index/**
        interceptorRegistry.addInterceptor(new FilterHandler()).addPathPatterns("/a");
    }

    //.....其他更多全域性定製實現方法  
}

 

第二個 攔截器邏輯 FilterHandler.java

public class FilterHandler implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        //在呼叫controller方法之前會呼叫此方法

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

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        //在呼叫controller方法之後會呼叫此方法
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        //頁面渲染完畢後會呼叫此方法
    }
}

 

第三個 業務訪問控制層 IndexController

@Controller
public class IndexController {

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

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

    @RequestMapping("/c")
    @ResponseBody
    public String c(){
        return "這是c方法 請你登陸";
    }
}

 

執行效果

 

 本篇部落格碼雲地址：https://gitee.com/zhao-baolin/springboot_interceptor