alidator校驗密碼輸入
使用Struts的validator校驗頁(yè)面form中的兩個(gè)字段是否一致,一般用在校驗密碼,當用戶(hù)輸入兩次密碼的時(shí)候需要校驗用戶(hù)的兩次輸入是否一致,如果不一致需要報錯.實(shí)現這個(gè)功能的步驟如下:
編寫(xiě)一個(gè)校驗器(Validator),實(shí)現對form中兩個(gè)字段的一致性校驗:
package cn.com.syni.net800114.validator;
import org.apache.commons.validator.ValidatorUtil;
import org.apache.commons.validator.Field;
import org.apache.commons.validator.ValidatorAction;
import org.apache.commons.validator.GenericValidator;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.validator.Resources;
import javax.servlet.http.HttpServletRequest;
public class ValidationUtil {
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;
}
}
編寫(xiě)validator-rules文件,增加一個(gè)自定義校驗器的配置:
<validator name="twofields"
classname="cn.com.syni.net800114.validator.ValidationUtil" method="validateTwoFields"
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.twofields">
<javascript><![CDATA[
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;
// get field‘s value
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 = false;
}
}
}
if (fields.length > 0) {
focusField.focus();
alert(fields.join(‘\n‘));
}
return bValid;
}]]></javascript>
</validator>
編寫(xiě)JSP頁(yè)面
form中包括要進(jìn)行自定義校驗的字段,這里是兩個(gè)password類(lèi)型的input,校驗器將校驗用戶(hù)輸入的這兩個(gè)字段是否一致,如果不一致,將通過(guò)彈出對話(huà)框告訴用戶(hù):
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ page contentType="text/html; charset=GBK" %>
<html:html><head><title>Regiestation</title></head>
<body>
<html:form action="/registationAction.do" onsubmit="return validateRegistation(this);">
<bean:message key="userForm.password"/>
<html:password property="password"/><br>
<bean:message key="userForm.password2"/>
<html:password property="password2"/>
<br>
<html:submit property="submit" value="Submit"/><br>
<html:reset value ="Reset"/>
</html:form>
</body>
<html:javascript formName="registation" staticJavascript="true" dynamicJavascript="true"/>
</html:html>
其中,<html:form action=”/registationAction.do” onsubmit=”return validatorRegistation(this);”>說(shuō)明這個(gè)窗口需要使用Struts Validator進(jìn)行校驗,action屬性指定這個(gè)JSP頁(yè)面對應的Action,onsubmit屬性指定了這個(gè)頁(yè)面校驗所對應的ActionForm Bean,它的規則是 “return + validator + FormBeanName + (this);”,這里的例子表示這個(gè)頁(yè)面的action是/regiestationAction.do,它對應的Action Form名稱(chēng)為Registation(注意,如果在Struts-config.xml文件中ActionForm的名字為registation的話(huà)這里也要把第一個(gè)字母變?yōu)榇髮?xiě),否則出錯.
最后倒數第二行的<html:javascrip>標記說(shuō)明要使用java script進(jìn)行客戶(hù)端校驗,formName屬性指定Action Form的名稱(chēng),這個(gè)名稱(chēng)要跟struts-config.xml文件中的配置一致,嚴格區分大小寫(xiě),staticJavascript和dynamicJavascript分別指定是使用靜態(tài)的還是動(dòng)態(tài)的javascript代碼進(jìn)行校驗.
編寫(xiě)validator.xml配置文件:
<form name="registation" >
<field property="password" depends="required,twofields">
<msg name="required" key="errors.required"/>
<msg name="twofields" key="errors.twofields"/>
<arg0 key="userForm.password"/>
<arg1 key="userForm.password2" />
<var>
<var-name>secondProperty</var-name>
<var-value>password2</var-value>
</var>
</field>
</form>
這里要注意<var-name>屬性的secondProperty要跟ValidatorUtil.java中的校驗方法中的代碼一致,否則ValidatorUtil.java不能正確進(jìn)行校驗,<var-value>屬性指定這個(gè)校驗字段所參照的校驗字段,上面的配置代碼說(shuō)明要對form中的password字段進(jìn)行校驗,它必須和另外一個(gè)叫做password2的字段一致.
