[Spring study notes -MVC-17] of Spring MVC interceptors

 

Author: ssslinppp      

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1. Introduction and application scenarios interceptor

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2. interceptors and interceptor Interface Adapter

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3. Run the flow chart

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normal operation

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Interrupt the flow

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4. The procedure of Example

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Control layer:

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@Controller

@RequestMapping(value = "/test")

public class TestController {

    

    @RequestMapping(value = "/interceptor12")

    public String interceptor12() {

        System.out.println ( "Controller Layer Method -interceptor12");

        return "index";

    }

    

    @RequestMapping(value = "/interceptor34")

    public String interceptor34() {

        System.out.println ( "Controller Layer Method -interceptor34");

        return "index";

    }

}  

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A total of five interceptors defined

Each print only the message interceptor, each similar to the interceptor, the following procedures:

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public class MyInterceptor1 extends HandlerInterceptorAdapter {

    @Override

    public boolean preHandle(HttpServletRequest request,

            HttpServletResponse response, Object handler) throws Exception {

        System.out.println("MyInterceptor1-preHandle()");

        return true;

    }

 

    @Override

    public void postHandle(HttpServletRequest request,

            HttpServletResponse response, Object o, ModelAndView mav)

            throws Exception {

        System.out.println("MyInterceptor1-postHandle()");

    }

 

    @Override

    public void afterCompletion(HttpServletRequest request,

            HttpServletResponse response, Object o, Exception excptn)

            throws Exception {

        System.out.println("MyInterceptor1-afterCompletion()");

    }

 

}  

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配置拦截器

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<!-- 定义拦截器 -->

    <mvc:interceptors>

        <mvc:interceptor>

            <!-- 拦截指定请求 -->

            <mvc:mapping path="/test/interceptor12" />

            <bean class="com.ll.Interceptor.MyInterceptor1" />

        </mvc:interceptor>

        

        <!-- 拦截所有的请求 -->

        <mvc:interceptor>

            <mvc:mapping path="/test/*" />

            <bean class="com.ll.Interceptor.MyInterceptorAll" />

        </mvc:interceptor>

        

        <mvc:interceptor>

            <mvc:mapping path="/test/interceptor12" />

            <bean class="com.ll.Interceptor.MyInterceptor2" />

        </mvc:interceptor>

        

        <mvc:interceptor>

            <mvc:mapping path="/test/interceptor34" />

            <bean class="com.ll.Interceptor.MyInterceptor3" />

        </mvc:interceptor>

        

        <mvc:interceptor>

            <mvc:mapping path="/test/interceptor34" />

            <bean class="com.ll.Interceptor.MyInterceptor4" />

        </mvc:interceptor>

    </mvc:interceptors>   

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Special attention interceptor arrangement order, as follows:

1. MyInterceptor1；
2. MyInterceptorAll；
3. MyInterceptor2；
4. MyInterceptor3；
5. MyInterceptor4；

Wherein, MyInterceptor1 and MyInterceptor2 interceptor12 intercept requests, MyInterceptor3 and MyInterceptor4 interceptor34 intercept request, MyInterceptorAll intercepts all requests.

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5. Test

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http://localhost:8080/SpringMVCTest/test/interceptor12 

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http://localhost:8080/SpringMVCTest/test/interceptor34  

 

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6. Other Application Examples - Login Detection

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7. Other

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Is known from notes (Wiz)

 

Tags:  the Spring ,  the Spring MVC ,  the Spring MVC interceptors ,  and to do complete set ,  interceptor

Author: ssslinppp      

---

1. Introduction and application scenarios interceptor

---

 

2. interceptors and interceptor Interface Adapter

---

---

 

3. Run the flow chart

---

normal operation

---

Interrupt the flow

---

---

---

---

 

4. The procedure of Example

---

Control layer:

---

@Controller

@RequestMapping(value = "/test")

public class TestController {

    

    @RequestMapping(value = "/interceptor12")

    public String interceptor12() {

        System.out.println("Controller层方法-interceptor12");

        return "index";

    }

    

    @RequestMapping(value = "/interceptor34")

    public String interceptor34() {

        System.out.println("Controller层方法-interceptor34");

        return "index";

    }

}  

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总共定义了5个拦截器

每个拦截器中只是打印消息，各拦截器类似，程序如下：

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public class MyInterceptor1 extends HandlerInterceptorAdapter {

    @Override

    public boolean preHandle(HttpServletRequest request,

            HttpServletResponse response, Object handler) throws Exception {

        System.out.println("MyInterceptor1-preHandle()");

        return true;

    }

 

    @Override

    public void postHandle(HttpServletRequest request,

            HttpServletResponse response, Object o, ModelAndView mav)

            throws Exception {

        System.out.println("MyInterceptor1-postHandle()");

    }

 

    @Override

    public void afterCompletion(HttpServletRequest request,

            HttpServletResponse response, Object o, Exception excptn)

            throws Exception {

        System.out.println("MyInterceptor1-afterCompletion()");

    }

 

}  

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配置拦截器

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<!-- 定义拦截器 -->

    <mvc:interceptors>

        <mvc:interceptor>

            <!-- 拦截指定请求 -->

            <mvc:mapping path="/test/interceptor12" />

            <bean class="com.ll.Interceptor.MyInterceptor1" />

        </mvc:interceptor>

        

        <!-- 拦截所有的请求 -->

        <mvc:interceptor>

            <mvc:mapping path="/test/*" />

            <bean class="com.ll.Interceptor.MyInterceptorAll" />

        </mvc:interceptor>

        

        <mvc:interceptor>

            <mvc:mapping path="/test/interceptor12" />

            <bean class="com.ll.Interceptor.MyInterceptor2" />

        </mvc:interceptor>

        

        <mvc:interceptor>

            <mvc:mapping path="/test/interceptor34" />

            <bean class="com.ll.Interceptor.MyInterceptor3" />

        </mvc:interceptor>

        

        <mvc:interceptor>

            <mvc:mapping path="/test/interceptor34" />

            <bean class="com.ll.Interceptor.MyInterceptor4" />

        </mvc:interceptor>

    </mvc:interceptors>   

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特别注意拦截器的配置顺序,如下：

1. MyInterceptor1；
2. MyInterceptorAll；
3. MyInterceptor2；
4. MyInterceptor3；
5. MyInterceptor4；

其中，MyInterceptor1和MyInterceptor2拦截interceptor12请求，MyInterceptor3和MyInterceptor4拦截interceptor34请求，MyInterceptorAll拦截所有请求。

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5. 测试

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http://localhost:8080/SpringMVCTest/test/interceptor12 

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http://localhost:8080/SpringMVCTest/test/interceptor34  

 

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6. 其他应用举例-登录检测

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7. 其他

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来自为知笔记(Wiz)