Springboot-interceptor（拦截器）

第一步：pom.xml 引入依赖：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.szt</groupId>
    <artifactId>interceptordemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>interceptordemo</name>
    <description>my Interceptor Demo </description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.10.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>
需要 引入 spring-webmvc     spring-boot-starter-web

第二步：创建一个实现 HandlerInterceptor 的类

/**
 * Created by sunzhitao on 2018/6/12.
 * 1. preHandle 表示方法请求前的处理，若其返回值为FALSE，就中断请求目标方法了，只有返回值为TRUE时才继续执行方法内容。
 * 2. postHandle 是在目标方法执行完之后执行的。
 */

public class WebInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println(" WebInterceptor | preHandle ================");
        return true;
    }

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

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

第三步：注册拦截器。创建一个配置类并继承 WebMvcConfigurerAdapter。重写 addInterceptors 方法。

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

    public void  addInterceptors(InterceptorRegistry registry){
        registry.addInterceptor(new WebInterceptor()).addPathPatterns("/test/**").excludePathPatterns("/exclude/**");

    }

第四步：编写普通的controller 和方法。

第三步，TestController 的路径是要走拦截器的，ExcuteController的不走拦截器（排除了）

@RestController
@RequestMapping("/test")
public class TestController {

    @RequestMapping("/interceptor")
    public String interceptor(ModelMap model){
        model.addAttribute("a",111);
        System.out.println("**************  TestController | interceptor *******************");
        return "interceptor";
    }

}

@RestController
@RequestMapping("/exclude")
public class ExcuteController {

    @RequestMapping("/test")
    public String excludeTest(){
        System.out.println(" ************ ExcuteController | test ");
        return "exclude";
    }
}

两个方法都执行一遍，发现TestController里面走了拦截器，excludeTest没有走

结果：

Springboot-interceptor（拦截器）

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