Struts validate驗證的具體實現

　　Struts validate驗證

ActionErrors和ActionError都是ActionMessages的子類ActionError存放在ActionErrors 中ActionError對象中的參數為配置文件中配置的相應的值若配置文件中沒有配置或配置文件不適合都不能用< htnl:errors property=/>輸出

　　錯誤信息添加用

　　ActionErrors errors=new ActionErrors();

　　errorsadd(error_keynew ActionError(配置文件中的相應的值))

　　注解void add(javalangString propertyActionError error)

　　在jsp頁面中顯示錯誤

　　在Action中使用ActionMessages 他有兩個add方法:

　　他有兩個add方法:

　　void add(ActionMessages message)
Adds the meesage from the given ActionMessage object to tjis set of meesage
void add(javalangString propertyActionMessage message)
Add message to the set of message for the specifiled property

　　錯誤信息添加使用errorsadd(error_keynew ActionMessage(errorsloginerror))
另外要調用thissaveMessages(requesterrors)方法
這是orgapachestructsactionAction中的方法要用到的大概有兩個

　　saveErrors(少用)

protected void saveErrors(javaservlethttpHttoServletRequest requestActionErrors errors)
Save the specifiled error message keys into the appropriate request attribute for use by the<html:errors>
tagif any message are requiredOtherwiseensure that the request attribute is not created

　　saveMessage(常用)

protect void saveMessage(javaxServlethttpHttpServletRequest requestActionMessages messages)
Save the specified message keys into the appropriate request attribute for use by the<html:message>tag{
if messages=true is set}if any message are requiredOtherwiseensure that the request attribute is not
created

　　ActionErrors actionMessages ActionMessage ActionMessage是繼承關系父類在前子類在後

　　if (!loadFormgetUsername()equals()) {

　　  ActionMessages error = new ActionMessages();
  erroradd(username new ActionMessage(errorusername));
  saveErrors(request error);

　　 return mappingfindForward(S);
}

　　 if (!loadFormgetPassword()equals(abc)) {

　　  ActionMessages error = new ActionMessages();
  erroradd(password new ActionMessage(errorpassword));
  saveErrors(request error);

　　 return mappingfindForward(S);
}

　　 return mappingfindForward(S);

errorusername=\ue\uf\u
errorpassword=\ubc\u\u
errorup=\ue\uf\u\ubc\u\ued\ufd\uaa

　　FORM裡面

　　public ActionErrors validate(ActionMapping mapping
HttpServletRequest request) {

ActionErrors errors = new ActionErrors();
if (null == usernametrim() || null == passwordtrim()||usernamelength()<

||passwordlength()<) {

　　 errorsadd(username new ActionMessage(errorup));
Systemoutprintln(errors);

　　 return errors;
}

　　 return null;
}

　　nativeascii 來處理中文漢字

From:http://tw.wingwit.com/Article/program/Java/ky/201311/28325.html