struts数据类型转化（Double.parseDouble()）(values[0].split)(string centerValues[])(properties)

最新推荐文章于 2023-09-17 20:48:20 发布

原创最新推荐文章于 2023-09-17 20:48:20 发布 · 704 阅读

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#struts #string #properties #class #encoding #html

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本文详细介绍了Struts2框架在Web应用中的配置方式，包括web.xml和struts.xml文件的设置，以及如何通过这些配置实现动态网页的开发。同时，展示了一个简单的CircleAction案例，说明了如何利用Struts2进行页面跳转和数据传递。

(font color="#333333")(s:submit value="submit")

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">
	
	
  <display-name>StrutsTutorial</display-name>

  <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>
    
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

	<constant name="struts.devMode" value="true"></constant>
	<constant name="struts.i18n.encoding" value="utf-8"></constant>
	
    <!-- 引入默认文件(可能就是以前这里没有引入，所以错误啦) -->
    <include file="struts-default.xml"></include>
    
	<package name="convert" namespace="/convert" extends="struts-default">
		<action name="circle" class="com.CircleAction">
			<result name="success">/circleMessage.jsp</result>
		</action>
	</package>
</struts>

circleMessage.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
	<body>
		<s:property value="message"/>
	</body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head>
  </head>
  
  <body>
    <s:form action="convert/circle.action" method="post">
    	<table align="center" border="0" width="400">
    		<tr>
    			<td colspan="2"><font color="#3737de"></font>
    		</tr>
    		<tr>
    			<td><input type="text" name="circle"/></td>
    			<td><font color="red">x,y,radius</font></td>
    		</tr>
    		<tr>
    			<td colspan="3" align="center"><s:submit value="submit"></s:submit></td>
    		</tr>
    	</table>
    </s:form>
  </body>
</html>

Point.java

package com;

public class Point 
{
	private double x;
	private double y;
	public double getX() {
		return x;
	}
	public void setX(double x) {
		this.x = x;
	}
	public double getY() {
		return y;
	}
	public void setY(double y) {
		this.y = y;
	}
	
}

Circle.java

package com;

public class Circle 
{
	private Double radius;
	private Point center;
	public Double getRadius() {
		return radius;
	}
	public void setRadius(Double radius) {
		this.radius = radius;
	}
	public Point getCenter() {
		return center;
	}
	public void setCenter(Point center) {
		this.center = center;
	}
	
}

CircleAction.java

package com;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class CircleAction extends ActionSupport
{
	private Circle circle;
	@Override
	public String execute() throws Exception
	{
		double c=2*3.14*circle.getRadius();
		double s=3.14*circle.getRadius()*circle.getRadius();
		
		ActionContext.getContext().put("message", 
				circle.getCenter().getX()+","+circle.getCenter().getY());
		return SUCCESS;
	}
	public Circle getCircle() {
		return circle;
	}
	public void setCircle(Circle circle) {
		this.circle = circle;
	}
	
}

CircleConvert.java

package com;

import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

public class CircleConverter extends StrutsTypeConverter 
{
@Override
	public Object convertFromString(Map context,String[] values,Class toClass)
	{
		Circle circle=new Circle();
		Point center=new Point();
		String centerValues[]=values[0].split(",");
		double x=Double.parseDouble(centerValues[0]);
		double y=Double.parseDouble(centerValues[1]);
		center.setX(x);center.setY(y);
		circle.setRadius(Double.parseDouble(centerValues[2]));
		circle.setCenter(center);
		return circle;
	}
@Override
	public String convertToString(Map context,Object value)
	{
		Circle circle=(Circle)value;
		return circle.toString();
	}
}

CircleAction-conversion.propertiesCircleAction-conversion.propertiesCircleAction-conversion.propertiesCircleAction-conversion.properties

circle=com.CircleConverter