JAVA_WEB Struts2学习：struts2自定义类型转换类_java struts2 定义类-优快云博客

本文详细介绍了OGNL在Struts框架中的应用，包括JSP与Servlet的区别，自定义拦截器的实现方法及步骤，以及如何通过OGNL进行数据绑定和验证。通过示例代码演示了如何使用OGNL进行表单数据处理和视图渲染。

OGNL学习：
JSP跟servlet的区别，JSP是不是客户端？
浏览器能看到的只有HTML。

拦截器的执行顺序为：

在Action的控制方法执行之前，位于拦截器链前面的拦截器将先起作用

，在action的控制方法执行之后，位于拦截器链前面的拦截器将后起作用。
自定义拦截器的实现，应该实现com.opensymphony.xwork2.interceptor.Interceptor接口，该接口有三个方法
1.void destory();//销毁该拦截器之前的回调方法
2.void init(); //初始化该拦截器的回调方法

3.String intercept(ActionInvocation invocation);//拦截器实现拦截的逻辑方法，如果该方法直接返回一个字符串，系统将会跳转到该逻辑视图对应的实际视图资源，不会调用被拦截的action。

以下是源代码演示：

1.index：

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<link rel="stylesheet" type="text/css" href="<%=path%>/js/My97DatePicker/skin/WdatePicker.css">
	<script language="javascript" type="text/javascript" src="<%=path%>/js/My97DatePicker/WdatePicker.js"></script>
	
  </head>
  
  <body>
    <s:form action="myAction!init">
    	<table><caption>OGNL练习</caption>
    		<s:textfield name="age" label="年龄"></s:textfield>
    		<s:fielderror fieldName="age"></s:fielderror>
    		
    		<s:textfield name="birthday" label="生日" 
    			onfocus="WdatePicker({isShowClear:false,readOnly:true,doubleCalendar:false,dateFmt:'yyyy-MM-dd HH:mm:ss'})" class="Wdate">
    		</s:textfield>
    		<s:fielderror fieldName="birthday"></s:fielderror>
    		
    		<s:textfield name="point" label="坐标"></s:textfield>
    		<s:fielderror fieldName="point"></s:fielderror>
    		
    		<s:submit value=" 提 交 "></s:submit>
    	</table>
    </s:form>
  </body>
</html>

2.struts.xml：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

	<package name="testPage" extends="struts-default">
		<!-- 配置拦截器 -->
		<interceptors>
			<interceptor name="myInterceptor" class="com.zuxia.yc42.myinterceptor.MyInterceptor"></interceptor>	<!--  自定义拦截器 -->
			
			<interceptor-stack name="myStack">
				<!-- 把struts默认的拦截器组加上 -->
				<interceptor-ref name="defaultStack"></interceptor-ref>	
				<!-- 加上我们自定义的拦截器 -->
				<interceptor-ref name="myInterceptor"></interceptor-ref>
			</interceptor-stack>
		</interceptors>
		
		
		<!--设置我们自己组装成的myStack拦截器组为默认拦截器 -->
		<!--<default-action-ref name="myStack"></default-action-ref>-->
		
		<action name="testAction1" class="com.zuxia.yc42.action.TestAction1">
			<result name="success">/jsp/success.jsp</result>
			<!-- 调用我们自己组装成的myStack拦截器组 -->
			<interceptor-ref name="myStack"></interceptor-ref>	
		</action>
		
		
		<action name="testAction2" class="com.zuxia.yc42.action.MyTestaAction1">
			<result name="success">/jsp/success.jsp</result>
			<result name="input">/jsp/point.jsp</result>
		</action>
	</package>
	
</struts>

3.xwork-conversion.properties：

com.zuxia.yc42.util.PointConverter=com.zuxia.yc42.util.DateConverter

4.com.zuxia.yc42.util.DateConverter extends StrutsTypeConverter :

package com.zuxia.yc42.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

public class DateConverter extends StrutsTypeConverter 
{
	private SimpleDateFormat[] sm = {new SimpleDateFormat("yyyy年MM月dd日"),
									 new SimpleDateFormat("yyyy-MM-dd"),
									 new SimpleDateFormat("yyyy.MM.dd"),
									 new SimpleDateFormat("yyyy/MM/dd"),
									 new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒"),
									 new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"),
									 new SimpleDateFormat("yyyy.MM.dd HH:mm:ss"),
									 new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"),
					};

	@Override
	public Object convertFromString(Map context, String[] values, Class toType) {
		String time = values[0];
		Date date = null;
		for(SimpleDateFormat simple:sm)
		{
			try {
				date = simple.parse(time);
			} catch (ParseException e) {
				continue;
			}
		}
		
		return date;
	}

	@Override
	public String convertToString(Map context, Object obj) {
		SimpleDateFormat simple = new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒");
		return simple.format((Date)obj);
	}

}

5.com.zuxia.yc42.util.PointConverter extends StrutsTypeConverter:

package com.zuxia.yc42.util;

import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

import com.zuxia.yc42.po.Point;

/**
 * 自定义类型转换类
 * @author wang_hao
 *
 */
public class PointConverter extends StrutsTypeConverter {

	/**
	 * 将客户端数据转换成服务器端数据类型
	 */
	@Override
	public Object convertFromString(Map context, String[] values, Class toType) {
		String value = values[0];
		String[] vals = value.split(",");
		Integer x = Integer.parseInt(vals[0]);
		Integer y = Integer.parseInt(vals[1]);
		
		Point point = new Point();
		point.setX(x);
		point.setY(y);
		
		return point;
	}

	/**
	 * 将服务器端数据类型转换为String类型
	 */
	@Override
	public String convertToString(Map context, Object obj)
	{
		return obj.toString();
	}

}

6.com.zuxia.yc42.action.MyTestAction extends ActionSupport:

package com.zuxia.yc42.action.MyTestAction extends ActionSupport;

import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;
import com.zuxia.yc42.po.Point;

public class MyTestAction extends ActionSupport
{
	private Integer age;
	private Date birthday;
	private Point point;
	
	public String init()
	{
		Object o = new Object();
		System.out.println(age.toString()+"\t"+birthday+"\t"+point);
		return SUCCESS;
	}
	
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	public Point getPoint() {
		return point;
	}
	public void setPoint(Point point) {
		this.point = point;
	}

}