Posted on 2005-10-31 18:00
qiyadeng 閱讀(1191)
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J2EE
在使用Struts的時(shí)候，驗(yàn)證是使用Validator來做，但是有時(shí)候需要有自己的驗(yàn)證規(guī)則,幸運(yùn)的是我們可以方便地進(jìn)行擴(kuò)展。
比如我們想定義一個(gè)規(guī)則來判定兩次輸入的密碼是相等的。我們需要這樣做，首先我們需要一個(gè)類，象這樣子 ：
package com.motel168.util;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.validator.Field;
import org.apache.commons.validator.GenericValidator;
import org.apache.commons.validator.ValidatorAction;
import org.apache.commons.validator.ValidatorUtil;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.validator.Resources;
public class MyValidator {
??? public static boolean validateTwoFields(Object
bean,ValidatorAction va,Field field,ActionErrors
errors,HttpServletRequest request){
??? ???
??? ??? String value = ValidatorUtil.getValueAsString(bean,field.getProperty());
??? ??? String sProperty2 = field.getVarValue("secondProperty");
??? ??? String value2 = ValidatorUtil.getValueAsString(bean,sProperty2);
??? ??? if(!GenericValidator.isBlankOrNull(value)){
??? ??? ??? try{
??? ??? ??? ??? if(!value.equals(value2)){
??? ??? ???
??? ???
errors.add(field.getKey(),Resources.getActionError(request,va,field));
??? ??? ??? ??? ??? return false;
??? ??? ??? ??? }
??? ??? ??? }catch(Exception e){
??? ??? ???
???
errors.add(field.getKey(),Resources.getActionError(request,va,field));
??? ??? ??? ??? return false;
??? ??? ??? }
??? ??? }
??? ??? return true;
??? }
???
}
上面這個(gè)類就是用來判斷兩個(gè)域是否相等，很簡單，但是注意方法名一定要是validateXXX。
接下來需要擴(kuò)展validator-rules.xml,在之前加入這么一段:
??? ?
??? ? ??? ???
???
?methodParams="java.lang.Object,org.apache.commons.validator.ValidatorAction,org.apache.commons.validator.Field,org.apache.struts.action.ActionErrors,javax.servlet.http.HttpServletRequest"
??? ? ??? ???
??? ?depends="required" msg="errors.twofield">
??? ?
??? ?
??? ??? function validateTwoFields(form){
??? ? ??? ??? var bValid = true;
??? ? ??? ??? var focusField = null;
??? ? ??? ??? var i = 0;
??? ? ??? ??? var fields = new Array();
??? ? ??? ??? oTwoFields = new twofields();
??? ? ??? ??? for(x in oTwoFields){
??? ? ??? ??? ??? var field = form[oTwoFields[x][0]];
??? ? ??? ???
??? var secondField =
form[oTwoFields[x][2]("secondProperty")];
??? ? ??? ???
???
if(field.type=="text"||field.type=="textarea"||field.type=="select-one"||field.type=="radio"||field.type=="password"){
??? ? ??? ??? ??? ??? var value;
??? ? ??? ??? ??? ??? var secondValue;
??? ? ??? ???
??? ??? if(field.type=="select-one"){
??? ? ??? ???
??? ??? ??? var si =
field.selectedIndex;
??? ? ??? ???
??? ??? ??? value =
field.options[si].value;
??? ? ??? ???
??? ??? ??? secondValue =
secondField.options[si].value;
??? ? ??? ??? ??? ??? }else{
??? ? ??? ???
??? ??? ???
value=field.value;
??? ? ??? ???
??? ??? ??? secondValue =
secondField.value;
??? ? ??? ??? ??? ??? }
??? ? ??? ??? ??? ??? if(value!=secondValue){
??? ??? ? ???
??? ??? ??? if(i==0){
??? ??? ? ???
??? ??? ???
??? focusField = field;
??? ? ??? ??? ??? ??? }
??? ? ??? ???
??? ??? fields[i++]=oTwoFields[x][1];
??? ? ??? ??? ??? ??? bValid = flase;
??? ? ??? ??? ??? }
??? ? ??? ??? }
??? ? ??? }
??? ? ??? if(fiels.length > 0){
??? ? ??? ??? focusFiled.focus();
??? ? ??? ??? alert(fields.join('\n'));
??? ? ??? ??? }
??? ? ??? return bValid;
??? ?
??? ? ]]>
??? ?
??? ? ???
然后使用的時(shí)候就和其他沒什么兩樣的了：
??? ???
注意這個(gè)地方
??? ??? ??? ???
??? ??? ???
??? ???
secondProperty
??? ??? ???
??? ???
newPassword2
??? ??? ??? ???
就是我們?cè)趈ava類中讀取的變量，它代表的是另外的一個(gè)域。
在JSP中的使用就不再說明了，大功告成:)。