Struts中使用validate()输入校验方法详解

@Override //重写Action中的validate()方法
public void validate() {
if(null==this.username||this.username.length()<4||this.username.length()>6){
this.addActionError("username invadate");
}
}

/registerResult.jsp
/register.jsp

<s:actionerror cssStyle="color:red"/>

//注意，使用struts2标签必须在头文件中引入标签：
<%@ taglib prefix="s" uri="/struts-tags" %>

if(null != birthday && null != graduation)
{
Calendar c1 = Calendar.getInstance();
c1.setTime(birthday);
Calendar c2 = Calendar.getInstance();
c2.setTime(graduation);
if(!c1.before(c2))
{
this.addActionError("birthday should be before graduation");
}
}

<s:actionerror cssStyle="color:red"/>//action级别
<s:fielderror cssStyle="color:blue"></s:fielderror>//field级别
public void validate() {
if(null==this.username||this.username.length()<4||this.username.length()>6){
this.addActionError("username invadate");//往Action级别添加错误信息
this.addFieldError("username", "username invadate in field");//往field级别处添加错误信息
}
}

<s:form action="RegisterAction">
<s:textfield name="username" label="username"></s:textfield>
<s:password name="password" label="password"></s:password>
<s:password name="repassword" label="repassword"></s:password>
<s:textfield name="age" label="age"></s:textfield>
<s:textfield name="birthday" label="brithday"></s:textfield>
<s:textfield name="graduate" label="graduate"></s:textfield>
<s:submit value="submit"></s:submit>
</s:form>

<s:form action="RegisterAction" theme="simple"><br/>
username:<s:textfield name="username" label="username"></s:textfield><br/>
password:<s:password name="password" label="password"></s:password><br/>
repassword:<s:password name="repassword" label="repassword"></s:password><br/>
age:<s:textfield name="age" label="age"></s:textfield><br/>
birthday:<s:textfield name="birthday" label="brithday"></s:textfield><br/>
graduate:<s:textfield name="graduate" label="graduate"></s:textfield><br/>
<s:submit value="submit"></s:submit>
</s:form>