Struts2拦截器-PreResultListener

最新推荐文章于 2019-09-17 16:27:56 发布

原创最新推荐文章于 2019-09-17 16:27:56 发布 · 211 阅读

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本文介绍了一个Struts2框架中使用自定义拦截器的例子，包括PreResultListener的应用。通过MyAction类和MyInterceptor类的配合，展示了如何在action方法执行后及返回结果前加入定制化的逻辑。

PreResultListener拦截器是在action方法执行后，返回result之前执行的拦截器。

MyAction.java

package com.struts2.interceptor;   
import com.opensymphony.xwork2.ActionSupport;   
public class MyAction extends ActionSupport {   
    /**  
     *   
     */  
    private static final long serialVersionUID = 1L;   
    @Override  
    public String execute() throws Exception {   
        System.out.println("execute方法");   
        return SUCCESS ;   
    }   

}

MyAction.java
package com.struts2.interceptor;

import com.opensymphony.xwork2.ActionSupport;
public class MyAction extends ActionSupport {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	@Override
	public String execute() throws Exception {
		System.out.println("execute方法");
		return SUCCESS ;
	}
}

一个简单例子，打印简单的一句话，加上一个简单的拦截器

MyInterceptor.java

package com.struts2.interceptor;   
import com.opensymphony.xwork2.ActionInvocation;   
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;   
public class MyInterceptor extends AbstractInterceptor {   
    /**  
     *   
     */  
    private static final long serialVersionUID = 1L;   
    @Override  
    public String intercept(ActionInvocation invo) throws Exception {   

        invo.addPreResultListener(new PreInter()) ;   
        System.out.println("拦截器前执行");   

        String result = invo.invoke() ;   

        System.out.println("拦截器后执行");   

        return result ;   
    }   
}

MyInterceptor.java

package com.struts2.interceptor;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
public class MyInterceptor extends AbstractInterceptor {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	@Override
	public String intercept(ActionInvocation invo) throws Exception {

		invo.addPreResultListener(new PreInter()) ;
		System.out.println("拦截器前执行");

		String result = invo.invoke() ;

		System.out.println("拦截器后执行");

		return result ;
	}
}

加上preResult拦截器：

PreInter.java
package com.struts2.interceptor;   
import com.opensymphony.xwork2.ActionInvocation;   
public class PreInter implements PreResultListener {   
    public void beforeResult(ActionInvocation arg0, String arg1) {   
        System.out.println("结果集返回前执行");   
    }   
}

PreInter.java

package com.struts2.interceptor;
import com.opensymphony.xwork2.ActionInvocation;
public class PreInter implements PreResultListener {
	public void beforeResult(ActionInvocation arg0, String arg1) {
		System.out.println("结果集返回前执行");
	}
}

运行结果：

拦截器前执行
execute方法
结果集返回前执行
拦截器后执行