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SpringBoot使用Interceptor拦截器的实例

作者:FlyLikeButterfly

这篇文章主要介绍了SpringBoot使用Interceptor拦截器的相关知识,本文通过实例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下

在springboot中使用拦截器也比较简单,实现HandlerInterceptor或者AsyncHandlerInterceptor接口,再从配置里添加一下拦截器就完成了;

AsyncHandlerInterceptor接口继承了HandlerInterceptor,多了一个afterConcurrentHandlingStarted方法:

接口里的方法:

方法执行顺序有两种:

配置拦截器:

实现WebMvcConfigurer接口里的addInterceptors方法,使用参数InterceptorRegistry对象添加自己的拦截器,可以添加指定拦截路径或者去掉某些过滤路径,还可以设置拦截器的优先级order,优先级由小到大,默认0;

多个拦截器的执行顺序:

preHandle方法按照order由小到大顺序,执行完controller后,其他方法则反向顺序,跟过滤器Filter类似;

测试启动类,默认配置:

/**
 * 2023年3月16日下午4:56:23
 */
package testspringboot.test9interceptor;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
/**
 * @author XWF
 *
 */
@SpringBootApplication
public class Test9Main {
 
    /**
     * @param args
     */
    public static void main(String[] args) {
        SpringApplication.run(Test9Main.class, args);
    }
 
}

controller类:

/**
 * 2023年3月16日下午4:58:02
 */
package testspringboot.test9interceptor;
 
import java.util.concurrent.Callable;
 
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
/**
 * @author XWF
 *
 */
@RestController
@RequestMapping("/interceptor")
public class Test9Controller {
 
    @RequestMapping("/a")
    public String a(String s) {
        System.out.println(">>>a():" + s);
        return "OK";
    }
    
    @RequestMapping("/b")
    public Callable<String> b() {
        Callable<String> callable = new Callable<String>() {
            @Override
            public String call() throws Exception {
                Thread.sleep(2000);
                System.out.println("call() thread id=" + Thread.currentThread().getId());
                Thread.sleep(2000);
                return "abcdefg";
            }
        };
        System.out.println(">>>b()");
        return callable;
    }
    
}

两个自定义拦截器1和2:

/**
 * 2023年3月16日下午5:14:14
 */
package testspringboot.test9interceptor;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
 
/**
 * @author XWF
 *
 */
public class MyInterceptor1 implements HandlerInterceptor {
 
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        System.out.println("preHandle 1, handler=" + handler);
        return request.getQueryString().length() < 10 ? true : false; 
    }
    
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle 1");
    }
    
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        System.out.println("afterCompletion 1");
    }
    
}
/**
 * 2023年3月16日下午5:15:28
 */
package testspringboot.test9interceptor;
 
import java.util.Date;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.AsyncHandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
 
/**
 * @author XWF
 *
 */
@Component
public class MyInterceptor2 implements AsyncHandlerInterceptor {
 
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        System.out.println("preHandle 2 " + new Date() + " ThreadId=" + Thread.currentThread().getId());
        return true;
    }
    
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle 2");
    }
    
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        System.out.println("afterCompletion 2");
    }
    
    @Override
    public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        System.out.println("afterConcurrentHandlingStarted 2 " + new Date());
    }
    
}

配置拦截器:

/**
 * 2023年3月16日下午5:20:31
 */
package testspringboot.test9interceptor;
 
import javax.annotation.Resource;
 
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
/**
 * @author XWF
 *
 */
@Configuration
public class MyInterceptorConfig implements WebMvcConfigurer {
 
    @Resource
    MyInterceptor2 myinterceptor2;
    
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptor1())
            .addPathPatterns("/interceptor/a")        //添加拦截路径,两种参数List<String>和String ...
            .excludePathPatterns("/interceptor/b")        //排除路径,两种参数List<String>和String ...
            .order(1);        //设置拦截器顺序,由小到大,默认0
        registry.addInterceptor(myinterceptor2);    //也可以使用spring管理的对象
    }
    
}

发送一个post测试请求:http://192.168.1.30:8080/interceptor/a?s=hello,拦截器2的order默认0,拦截器1的order为1,preHandle先执行2的,controller执行之后,剩下的Handle都是先执行1再执行2的;

发送preHandle返回false的请求:http://192.168.1.30:8080/interceptor/a?s=hello123456789,拦截器1的preHandle返回false后,直接执行2的afterCompletion;

发送测试callable的请求:http://192.168.1.30:8080/interceptor/b?s=hello,拦截路径配置跳过拦截器1只执行拦截器2,通过threadid可以看到前后使用的是两个线程;

到此这篇关于SpringBoot使用Interceptor拦截器的文章就介绍到这了,更多相关SpringBoot使用Interceptor拦截器内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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