Interceptor类代码
package com.ganlong.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
@Component
public class TimeInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("进入方法之前执行");
System.out.println(((HandlerMethod)handler).getBean().getClass());
//return true进入方法,return false不进入方法。
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
System.out.println("进入方法之后执行,方法中出错了就不会进入该方法");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println("进入方法之后执行,不管方法正常执行还是出错了,都会进入该方法。");
}
}
config文件
package com.ganlong.config;
import java.util.ArrayList;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import com.ganlong.filter.TimeFilter;
import com.ganlong.interceptor.TimeInterceptor;
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter{
@Autowired
private TimeInterceptor timeInterceptor;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(timeInterceptor);
}
@Bean
public FilterRegistrationBean filterRegistrationBean() {
FilterRegistrationBean filterRegistrationBean=new FilterRegistrationBean();
//加入过滤器
filterRegistrationBean.setFilter(new TimeFilter());
//定义过滤器路径
ArrayList<String> urlList=new ArrayList();
urlList.add("/*");
filterRegistrationBean.setUrlPatterns(urlList);
return filterRegistrationBean;
}
}
总结:与filter不同,interceptor通过@Component注入spring容器不能直接起作用,需要配置进去。interceptor相比filter可以得到controller的类目和进入的方法名。
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