Interceptor拦截器demo

Interceptor拦截器demo

##接口测试类
@RestController
public class TestController {

@RequestMapping(value = "/myInterceptorsTestUrl", method = RequestMethod.GET)
    public String myInterceptorsTestUrl(HttpServletRequest request) {
        return request.getRequestURL().toString() +"-"+ request.getAttribute("name");
    }

    @RequestMapping(value = "/testUrl", method = RequestMethod.GET)
    public String testUrl(HttpServletRequest request) {
        return request.getRequestURL().toString() +"-"+ request.getAttribute("name");
    }

}


##拦截器类
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

public class MyInterceptor implements HandlerInterceptor {
    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle>>>拦截器");
        //设置编码
        request.setCharacterEncoding("UTF-8");
        //设置属性值
        request.setAttribute("name","hello,interceptor");

        //参数
        String path = request.getRequestURI();

        String reqMethod = request.getMethod();
        HandlerMethod hm = (HandlerMethod) handler;
        String userAgent = request.getHeader("User-Agent");
        String reqIp = getReqIpAddr(request);
        String reqUri = request.getServletPath();
        System.out.println("path=" + path);
        System.out.println("reqMethod=" + reqMethod);
        System.out.println("userAgent=" + userAgent);
        System.out.println("reqIp=" + reqIp);
        System.out.println("reqUri=" + reqUri);

        //调用
//        hm.getMethod().invoke(hm);
        String methodName = hm.getMethod().getName();
        System.out.println("methodName=" + methodName);

        String beanName = hm.getBeanType().getName();
        System.out.println("beanName=" + beanName);

        return true; //return false; 不往后续执行
    }

    protected String getReqIpAddr(HttpServletRequest request) {
        String ip = null;
        try {
            ip = request.getHeader("x-forwarded-for");
            if (!StringUtils.hasText(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (!StringUtils.hasText(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (!StringUtils.hasText(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } catch (Exception e) {
            logger.error("",e);
        }
        return ip;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle>>>拦截器");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion>>>拦截器");
    }
}


//拦截器注册类
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.ArrayList;
import java.util.List;

@Configuration
public class WebAPPMvcConfigurer implements WebMvcConfigurer {

    /**
     * 拦截器注册
     * @param registry
     *
     * http://localhost:8080/testUrl
     * 页面输出：http://localhost:8080/testUrl-null
     *
     * http://localhost:8080/myInterceptorsTestUrl
     * 页面输出：http://localhost:8080/myInterceptorsTestUrl-hello,interceptor
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //匹配规则
//        registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");

        //按请求地址来匹配，字符集合
        List<String> listPath = new ArrayList<>();
        listPath.add("/myInterceptorsTestUrl");
        registry.addInterceptor(new MyInterceptor()).addPathPatterns(listPath);
    }

}

或者在applicationContext.xml配置文件中配置

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
       http://www.springframework.org/schema/context 
       http://www.springframework.org/schema/context/spring-context-3.2.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
       

    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/myInterceptorsTestUrl"/>
            <bean class="com.example.mytest.interceptor.MyInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>

</beans>

//springboot启动类加载配置文件

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.context.annotation.ImportResource;

@EnableAspectJAutoProxy
@SpringBootApplication
@ImportResource("classpath:applicationContext.xml")
public class MyApplication {

    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }

}