struts2 数据校验总结
struts2的数据校验实在struts2的类型转换之后进行的，给出如下的示例：
?1、编写register2.jsp,让客户输入数据，代码如下：
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<body><table align="center" width="30%"><tr><td style="color:red"><s:fielderror></s:fielderror></td></tr></table><form action="reg.action" method="post"><table align="center" border="1" width="30%"><tr> <td>username</td><td><input type="text" name="username" /></td></tr><tr><td>password</td><td><input type="password" name="password"></td></tr><tr><td>re-password</td><td><input type="password" name="repassword"></td></tr><tr><td>age</td><td><input type="text" name="age"></td></tr><tr><td>birthday</td><td><input type="text" name="birthday"></td></tr><tr><td>graduation</td><td><input type="text" name="graduation"></td></tr> <tr><td> <input type="submit" value="submit"></td><td><input type="reset" value="reset"></td></tr></table> </form></body>
?? 可以按照如下的规则进行数据校验
?? (1)username不能为空值，并且长度在6--10之间。
?? (2)password不能为空值，并且长度在6--10之间。
?? (3)repassword不能为空值，并且长度在6--10之间。
?? (4)age必须在1--150之间
???(5)birthday不能为空值。
?? (6)graduation不能为空值。
?? (7)birthday的日期必须早于graduation的日期。
2、配置校验文件，命名为：RegisterAciton-validation.xml。加入如下代码
???
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator 1.0.2//EN" "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd"><validators><field name="username"> <field-validator type="requiredstring"> <param name="trim">true</param> <message>username is should not be null!</message> </field-validator> <field-validator type="stringlength"> <param name="maxLength">10</param> <param name="minLength">6</param> <message>username length is incorrect and should be between ${minLength} and ${maxLength}</message> </field-validator></field><field name="password"><field-validator type="requiredstring"> <param name="trim">true</param> <message>password is should not be null</message></field-validator><field-validator type="stringlength"><param name="maxLength">10</param><param name="minLength">6</param><message>password length is incorrect and should be between ${minLength} and ${maxLength}</message></field-validator></field><field name="repassword"><field-validator type="requiredstring"> <param name="trim">true</param> <message>repassword is should not be null</message></field-validator><field-validator type="stringlength"><param name="maxLength">10</param><param name="minLength">6</param><message>repassword length is incorrect and should be between ${minLength} and ${maxLength}</message></field-validator></field><field name="age"> <field-validator type="int"> <param name="max">10</param> <param name="min">6</param> <message>age is incorrect and should be between ${min} and ${max}</message> </field-validator></field> <field name="birthday"> <field-validator type="required"> <message>birthday is incorrect</message> </field-validator> </field> <field name="graduation"> <field-validator type="required"> <message>graduation is incorrect</message> </field-validator> <field-validator type="date"> <param name="max">2050-08-12</param> <param name="min">2010-09-23</param> <message>graduation should after the birthday</message> </field-validator> </field></validators>?3、编写RegisterAciton类
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package com.test.action;import java.util.Calendar;import java.util.Date;import com.opensymphony.xwork2.ActionSupport;public class RegisterAciton extends ActionSupport{private String username;private String password;private String repassword;private int age;private Date birthday;private Date graduation;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getRepassword() {return repassword;}public void setRepassword(String repassword) {this.repassword = repassword;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}@Overridepublic String execute() throws Exception { return SUCCESS;}@Overridepublic void validate() {}public Date getGraduation() {return graduation;}public void setGraduation(Date graduation) {this.graduation = graduation;}}?
?? 4、配置struts.xml文件
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<action name="reg" name="code"><body> username <s:property value="username"/><br> password <s:property value="password"/><br> re-password <s:property value="repassword"/><br> age <s:property value="age"/><br> birthday <s:property value="birthday"/><br> graduation <s:property value="graduation"/></body>
?至此一个数据校验实例配置成功了
6、总结
??? (1)数据校验中xml文件的命名必须准确”action的类名-validation.properties“。
??? (2)struts2为我们提供了默认的校验，打印出的信息很不友好，所以我们可以对它提供的信息进行修正，有以下两种方法：
?? 第一种方法：
??? 在struts.xml中加入
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<constant name="struts.custom.i18n.resources"value="message"></constant>
??? 然后新建一个名为message.properties的文件，代码如下
????
xwork.default.invalid.fieldvalue={0} error??第二种方法：
????? 定义文件名为“类名.properties”输入的代码如下
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invalid.fieldvalue.age=\u5e74\u9f84\u8f93\u5165\u4e0d\u6b63\u786e
???? 意思是：invalid.fieldvalue.age=“年龄信息输入不正确”。
? (3)总共有两种校验方式，addActionError方法和addFieldError方法，可以在jsp文件中进行如下设置，来指定要显示的内容。
??
<table align="center" width="30%"> <tr> <td style="color: red"> <s:fielderror cssStyle="color:red" /> </td> </tr></table>
?(4)除了服务器端的数据校验我们可以提供客户端的数据校验，客户段数据校验有两种方法
???? 第一种方法： form的主题（theme）一定不能设置为simple；form的validate属性设为true
??????????????????????? 最好不要使用struts2给我们提供的客户端校验方法。
??? 第二种方法：编写js代码实现
??????????????????????? 将form的onsubmit的值设为如下的代码
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<s:form action="reg" theme="simple" onsubmit="return validate()">
????? 编写js
???????
<script type="text/javascript"> function validate() { var usernamevalue=document.getElementById("usernameId").value; var passwordvalue=document.getElementById("passwordId").value; var repasswordvalue=document.getElementById("repasswordId").value; if(usernamevalue.length==0) { alert("username should not be blank"); return false; } else if(usernamevalue.length>10||usernamevalue.length<6) { alert("length of username should be between 6 and 10"); return false; } if(passwordvalue.length==0) { alert("password should not be blank"); return false; } else if(passwordvalue.length>10||passwordvalue.length<6) { alert("length of password should be between 6 and 10"); return false; } if(repasswordvalue.length==0) { alert("repassword should not be blank"); return false; } else if(repasswordvalue.length>10||repasswordvalue.length<6) { alert("length of repassword should be between 6 and 10"); return false; } if(repasswordvalue!=passwordvalue) { alert("repasswordis not equals password!"); return false; } return true; } </script>?(5)当我们使用xml文件对数据进行校验时，在action类中不要重写validate方法。
(6)我们可以只对具体action类中的某个业务逻辑进行校验，命名方式为“aciton类的名字-方法名-validation.xml”，如果已经定义了"action类的名字-validation.xml"，那么struts2会先执行后者在执行前者。所以我们最好不要定义后者
(7)
???
class parentAction{ test()} class childAction extends parentAction{test()//重写test}parentAction-validtion.xmlparentAction-test-validtion.xmlchildAction-validtion.xmlchildAction-test-validtion.xml?对于以上代码，struts2对所有xml文件的访问顺序为从上到下。
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