異常，是基本上每個系統都會出現
這裏講點struts的異常信息的用法，很簡單的一個實例
首先自己定義個異常類，我這裏定義了一個運行時異常類
package com.asiainfo.struts.exception;
public class MyException extends RuntimeException{
public MyException() {
super();
// TODO Auto-generated constructor stub
}
public MyException(String message, Throwable cause,
boolean enableSuppression, boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
// TODO Auto-generated constructor stub
}
public MyException(String message, Throwable cause) {
super(message, cause);
// TODO Auto-generated constructor stub
}
public MyException(String message) {
super(message);
// TODO Auto-generated constructor stub
}
public MyException(Throwable cause) {
super(cause);
// TODO Auto-generated constructor stub
}
}
配置struts.xml文件
<global-results>
<result name="exception">WEB-INF/exception/error.jsp</result>
</global-results>
<global-exception-mappings>
<exception-mapping result="exception" exception="com.asiainfo.struts.exception.MyException"></exception-mapping>
</global-exception-mappings>error.jsp
<body>
${exception.message }
</body>然後自己寫一個運行時的異常，讓其拋出
public String validator(){
int i=10;
if(i==10){
throw new MyException("出現異常");
}
return "success";
}這時，strust.xml的異常配置會捕捉action裏面拋出的自定義異常信息
然後將其傳遞給error.jsp
