Strust 2类型转化器练习2--局部类型转换器

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代码：

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="GB18030"%><%@ taglib prefix="s" uri="/struts-tags"%><!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>长方形</title><style>.content {font-size: 12px;}#search_botton {border: 1px solid #8CC6FF;color: #0066CC;padding: 1px 1px;background-color: #f1f9ff;}</style></head><body>   <s:form action="computeArea">      <table border="0" class="content">        <tr>          <td><s:textfield name="rectangle" label="长方形长和宽是(中间“,”隔开）"/></td>        </tr>                <tr>          <td><s:submit value="提交" id="search_botton"></s:submit></td>        </tr>      </table>   </s:form></body></html>

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">  <display-name>Rectangle</display-name>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.htm</welcome-file>    <welcome-file>index.jsp</welcome-file>    <welcome-file>rectangle.jsp</welcome-file>    <welcome-file>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list>    <filter><filter-name>struts2Controller</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>  </filter>    <filter-mapping> <filter-name>struts2Controller</filter-name> <url-pattern>/*</url-pattern>  </filter-mapping></web-app>

Strust.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="demo1" extends="struts-default"> <action name="computeArea" class="com.action.AreaAction">  <result name="success">/showRectangle.jsp</result> </action>  </package></struts>

showRectangle.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><style>.content {font-size: 12px;}</style></head><body><table class="content">  <tr><td>长方形的面积是:<s:property value="rectangle" /></td>  </tr></table></body></html>

AreaAction.java

package com.action;import com.diman.Rectangle;import com.opensymphony.xwork2.ActionSupport;public class AreaAction extends ActionSupport {  private Rectangle rectangle;public Rectangle getRectangle() {return rectangle;}public void setRectangle(Rectangle rectangle) {this.rectangle = rectangle;}public String execute() throws Exception {// TODO Auto-generated method stubreturn "success";}  }

Rectangle.java

package com.diman;public class Rectangle {  private double length;  private double width;  private double area;public double getLength() {return length;}public void setLength(double length) {this.length = length;}public double getWidth() {return width;}public void setWidth(double width) {this.width = width;}public double getArea() {return area;}public void setArea(double area) {this.area = area;}  }

RectangleConverter.java

package com.converter;import java.lang.reflect.Member;import java.util.Map;import com.diman.Rectangle;import ognl.DefaultTypeConverter;public class RectangleConverter extends DefaultTypeConverter {/*  * context 是类型转换环境的上下文 * value 是须要转换的参数,方向不同,value的类型也是不同的. * toType是转换后的目标类型,            * 返回值是 : 转换后的目标类型, 方向不同,类型也是不同的.  */    public Object convertValue(final Map context,           final Object value, final Class toType){ //从表单字符串转换为 Rectangle对象        if (Rectangle.class == toType)        {            final Rectangle rectangle = new Rectangle();            final String[] str = (String[]) value;            final String[] param = str[0].split(",");            final double length = Double.parseDouble(param[0]);            final double width = Double.parseDouble(param[1]);            rectangle.setLength(length);            rectangle.setWidth(width);            return rectangle;        }        //从对象转换为字符串        if (String.class == toType)        {            final Rectangle rectangle = (Rectangle) value;            final double length = rectangle.getLength();            final double width = rectangle.getWidth();            final String area = (length*width)+"";            return area;        }        return null;    }}

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