struts2输入校验流程：
1.类型转换器对请求參数运行类型转换，并把转换后的值赋给aciton中的属性
2.假设在运行类型转换的过程中出现异常，系统会将异常信息保存到ActionContext,
conversionError拦截器将异常信息加入到fieldErrors里，无论类型转换是否出现异常，都会进入第三步
3.系统通过反射技术先调用action的validateXXX方法
4.再调用aciton中的validate方法
5.经过上述的4步。假设系统中的fieldErrors存在错误信息，系统自己主动将请求转发至名称为input的视图
假设系统中的fieldErrors没有不论什么错误信息，系统将运行aciton中的处理方法。
也就是说转发至input视图有两个原因：1.类型转换异常
2.输入校验不合法
例如以下：
InvidateAction.java:
package com.itheima.action;
import java.util.Date;
import com.opensymphony.xwork2.ActionSupport;
public class InvidateAction extends ActionSupport{
private String username;
private String tel;
private Date birthday;
private String msg;
public void setUsername(String username) {
this.username = username;
}
public void setTel(String tel) {
this.tel = tel;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getMsg() {
return msg;
}
public void validate() {
}
public String execute1() {
msg = "execute1";
return "success";
}
public String execute2() {
msg = "execute2";
return "success";
}
}
person.jsp:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<s:fielderror/>
<form action="${pageContext.request.contextPath }/invidateAction_execute1.action" method="post">
用户名：<input type="text" name="username"><br>
手机号：<input type="text" name="tel"><br>
生日：<input type="text" name="birthday"><br>
<input type="submit" value="提交">
</form>
</body>
</html>struts2.xml
<action name="invidateAction_*" class="com.itheima.action.InvidateAction" method="{1}">
<result name="success">/success.jsp</result>
<result name="input">/person.jsp</result>
</action>我在jsp中输入信息例如以下：
则会提示：
======================================================================================================
解决以上问题能够通过创建Action的类型转换器：
类型转换器教程參见：http://blog.csdn.net/m631521383/article/details/40680723
InvidateAction.java:
package com.itheima.action;
import java.util.Date;
import com.opensymphony.xwork2.ActionSupport;
public class InvidateAction extends ActionSupport{
private String username;
private String tel;
private Date birthday;
private String msg;
public void setUsername(String username) {
this.username = username;
}
public void setTel(String tel) {
this.tel = tel;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getMsg() {
return msg;
}
public void validate() {
}
public String execute1() {
msg = "execute1";
return "success";
}
public String execute2() {
msg = "execute2";
return "success";
}
}
DateTypeConverter.java:
package com.itheima.converter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;
import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;
public class DateTypeConverter extends DefaultTypeConverter{
@Override
public Object convertValue(Map<String, Object> context, Object value,
Class toType) {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmdd");
if(toType == Date.class) {
String[] strs = (String[])value;
Date date = null;
try {
date = dateFormat.parse(strs[0]);
} catch (ParseException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
return date;
} else if(toType == String.class) {
return dateFormat.format((Date)value);
}
return null;
}
}
InvidateAction-conversion.properties:
birthday=com.itheima.converter.DateTypeConverter
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