spring boot 拦截器的实现以及遇到的问题的解决方案

spring boot拦截器的实现

1、创建拦截器

　　创建拦截器，实现HandlerInterceptor接口即可

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class MyInterceptor implements HandlerInterceptor{

    @Autowired
    private BeanService service ;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView)
            throws Exception {
        // TODO Auto-generated method stub

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        // TODO Auto-generated method stub

    }

}

2、注册拦截器

　　注册拦截器的实现

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;



@Configuration
@EnableWebMvc
public class MyWebMvcConfigurerAdapter extends WebMvcConfigurerAdapter {

    @Bean
    MyInterceptor  myInterceptor(){
        return new MyInterceptor();
    }
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(myInterceptor()).addPathPatterns("/*");
        super.addInterceptors(registry);
        super.addInterceptors(registry);
    }
}

问题解析

1、bean加载的问题
　　在拦截器中注入bean。然后在注册拦截器的时候直接new或者是注入数据的时候会出现拦截器中的bean注册失败的问题，解决方案如MyWebMvcConfigurerAdapter代码片。添加一个方法去做拦截器加载，在方法上使用@bean去进行bean的加载管理即可

<script type="text/javascript"> $(function () { $('pre.prettyprint code').each(function () { var lines = $(this).text().split('\n').length; var $numbering = $('<ul/>').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i <= lines; i++) { $numbering.append($('<li/>').text(i)); }; $numbering.fadeIn(1700); }); }); </script>