一个简单的小类型转换方便以后参考
1 先建2个JSP网页
input.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
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="styles.css">
-->
</head>
<body>
<h3><font color="red">使用逗号将点的两个坐标分割开</font></h3>
<s:form action="pointConverter" method="post"><!-- 此处如果不写method方法，则Struts2将其默认为post方法，和以前的表单提交方法有些区别 -->
<s:textfield name="point" label="point"></s:textfield>
<s:textfield name="age" label="age"></s:textfield>
<s:textfield name="username" label="username"></s:textfield>
<s:textfield name="birthday" label="birthday"></s:textfield>
<s:submit label="submit"></s:submit>
</s:form>
</body>
</html>
out.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
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 'output.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="styles.css">
-->
</head>
<body>
point:<s:property value="point"/><br><!-- 相当于调用了PointAction中的getPoint()方法 -->
age:<s:property value="age"/><br/>
username:<s:property value="username"/><br/>
birthday:<s:property value="birthday"/>
</body>
</html>
2 web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
3 创建一个Point
package com.zlc.entity;
public class Point {
private int x;
private int y;
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
}
4 创建Action
package com.zlc.action;
import java.util.Date;
import com.opensymphony.xwork2.ActionSupport;
import com.zlc.entity.Point;
public class PointAction extends ActionSupport {
private Point point;;// 点的坐标point（x,y）
private int age;
private Date birthday;
public Point getPoint() {
return point;
}
public void setPoint(Point point) {
this.point = point;
}
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;
}
@Override
public String execute() throws Exception {
return "success";
}
}
同时在此类下添加 PointAction-conversion.properties文件
point=com.zlc.converter.PointConverter
配置类型转换文件（包括两种）
- 局部类型转换
别忘了配置PointAction-conversion.properties文件（放在com.zlc.action下，即必须和PointAction在同一目录下）
（PointAction-conversion.properties是局部类型转换配置文件，指只对当前的PointAction起作用）
此配置如下：
point=com.zlc.converter.PointConverter
这句话的意思是对PointAction中的属性point进行类型转换是通过com.zlc.converter.PointConverter转换器类进行的
2. 全局类型转换
说明： 这种情况是针对有多个Action，并且每个Action当中都有相同的属性point（坐标）需要转换的情况下配置的
使用全局类型转换省去了对每个Action都要进行转换的麻烦（即配置了多个ActionName-conversion.properties）.
全局类型转换配置的文件名字：xwork-conversion.properties是固定写法，要放在src目录下面
配置如下：
com.zlc.entity.Point=com.zlc.converter.PointConverter
表示对每个Action当中拥有的Point类的公共属性point通过PointConverter类型转换器 进行类型转换
注意：PointAction-conversion.properties命名规范：
ActionName+" -conversion.properties"。其中" -conversion.properties"是固定写法。
5 创建转化器的类
package com.zlc.converter;
import java.util.Map;
import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;
import com.zlc.entity.Point;
public class PointConverter extends DefaultTypeConverter {
@Override
public Object convertValue(Map<String, Object> context, Object value,
Class toType) {
if (Point.class == toType) {// 表示要转换的目标类型是Point类型（从字符串String向Point类型转换）
Point point = new Point();
String[] str = (String[]) value;// Object是所有类型的父类，在此Object是一个数组形式，要进行向下类型转换
String[] paramValues = str[0].split(",");// 表示将接收到的第一个字符串str[0]（如"20,30"用逗号分开成两个元素20，30放在数组中去
int x = Integer.parseInt(paramValues[0]);
int y = Integer.parseInt(paramValues[1]);
point.setX(x);
point.setY(y);
return point;
}// 表示客户端到自定义类的转换
if (String.class == toType) {// 表示目标类型是String（就是从Point类型向String转换）
Point point = (Point) value;
int x = point.getX();
int y = point.getY();
String result = "[x=" + x + " ,y=" + y + "]";
return result;
}
return null;
}
}
最后配置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="default" extends="struts-default">
<action name="pointConverter" class="com.zlc.action.PointAction">
<result name="success">/output.jsp</result>
<result name="input">/input.jsp</result>
</action>
</package>
</struts>
