一个Esper入门实例

1.新建一个java web项目，目录如图所示

2.

package com.test.esper;

import com.test.esper.ScuRate;
import com.espertech.esper.client.EPAdministrator;
import com.espertech.esper.client.EPRuntime;
import com.espertech.esper.client.EPServiceProvider;
import com.espertech.esper.client.EPServiceProviderManager;
import com.espertech.esper.client.EPStatement;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.UpdateListener;

public class test {
    public static void main(String[] args) throws InterruptedException {        
        EPServiceProvider epService = EPServiceProviderManager.getDefaultProvider();        
        EPAdministrator admin = epService.getEPAdministrator();        
        String product = ScuRate.class.getName();    
        String epl = "select respCode,count(1) from "
                + product +
                " (respCode='00').win:length_batch(10)";
         
        EPStatement state = admin.createEPL(epl);    
        state.addListener(new AppleListener());        
        EPRuntime runtime = epService.getEPRuntime();            
        for (int i = 0; i < 10; i++) {
            ScuRate rate = new ScuRate();
            rate.setRespCode("00");
            runtime.sendEvent(rate); 
        }              
    }        
}

class AppleListener implements UpdateListener    
{        
     public void update(EventBean[] newEvents, EventBean[] oldEvents)    
        {    
            if (newEvents != null)    
            {    
                Long count = (Long) newEvents[0].get("count(1)");
                System.out.println(count);
            }    
        }        
}  

package com.test.esper;

public class ScuRate {
   
        private String respCode;
        
        public String getRespCode()    
        {    
            return respCode;    
        }    
        
        public void setRespCode(String respCode)    
        {    
            this.respCode = respCode;    
        } 
    
}

3.通过类sql的方式容易得到查询的结果