?? requestlistenertest.java
字號(hào):
package com.j2ee14.ch9;
import javax.servlet.*;
import java.util.Locale;
/**
*對(duì)請(qǐng)求進(jìn)行監(jiān)聽(tīng),包含監(jiān)聽(tīng)請(qǐng)求的創(chuàng)建和銷毀以及請(qǐng)求中屬性的改變
*/
public class RequestListenerTest
implements ServletRequestListener,ServletRequestAttributeListener
{
//ServletRequestListener
public void requestDestroyed(ServletRequestEvent sre)
{
log("request 銷毀");
}
public void requestInitialized(ServletRequestEvent sre)
{
log("request 初始化了");
ServletRequest sr=sre.getServletRequest();
Locale locale=null;
locale=sr.getLocale();
if(locale.equals(Locale.CHINA))
sr.setAttribute("encoding","text/html;gb2312");
else if(locale.equals(Locale.US))
sr.setAttribute("encoding","text/html;utf-8");
else
sr.setAttribute("encoding","text/html;iso8859-1");
}//ServletRequestListener
//ServletRequestAttributeListener
public void attributeAdded(ServletRequestAttributeEvent event)
{
log("attributeAdded('" + event.getName() + "', '" +
event.getValue() + "')");
}
public void attributeRemoved(ServletRequestAttributeEvent event)
{
log("attributeRemoved('" + event.getName() + "', '" +
event.getValue() + "')");
}
public void attributeReplaced(ServletRequestAttributeEvent event)
{
log("attributeReplaced('" + event.getName() + "', '" +
event.getValue() + "')");
}//ServletRequestAttributeListener
private void log(String msg)
{
java.io.PrintWriter out=null;
try
{
out=new java.io.PrintWriter(new java.io.FileOutputStream("c:\\request_log.txt",true));
out.println(msg);
out.close();
}
catch(Exception e)
{
out.close();
}
}
}
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