Struts2传值之3ModelDriven

Struts2 ModelDriven 示例

最新推荐文章于 2020-03-08 21:03:06 发布

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本文介绍了一个使用Struts2框架中的ModelDriven特性实现简单计算器的例子。通过继承ModelDriven接口并实现getModel方法，可以简化Action类的设计。示例中包含了必要的Action类、JavaBean类、配置文件及HTML表单。

ModelDriven这个叫模型驱动

总的来说需要建javabean类，写Action的时候需要继承接口ModelDriven，可以不用在Action类中编写对应的get/set方法,但是需要实例化Cal类.

.jsp

<body>
    <form action="calAction" method="post" >
     操作数1：<input type="text" name="num1" value="${requestScope.num1}"><br>
    运算： <input type="radio" name="op" value="+"   ${requestScope.op=="+"? "checked": " "}>+
           <input type="radio" name="op" value="-"   ${requestScope.op=="-"? "checked" : " "}>-
           <input type="radio" name="op" value="*"   ${requestScope.op=="*"? "checked" : " "}>*
           <input type="radio" name="op" value="/"   ${requestScope.op=="/"? "checked" : " "}>/<br> 
    操作数2：<input type="text" name="num2" value="${requestScope.num2}"><br>
    <input type="submit" value="计算" ><br>
     结果：<input type="text" value="${requestScope.result}">
     </form>
  </body>

Action页面

package action;

import cal.Cal;

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

public class calAction extends ActionSupport implements ModelDriven<Cal> {
	private Cal cal=new Cal();
	public String caloption(){
		float result=0;
		System.out.println(cal.getOp());
		float num1=cal.getNum1();
		float num2=cal.getNum2();
		 switch(cal.getOp().charAt(0)){
		  case '+':
			  result=num1+num2;
			  break;
		  case '-':
			  
			  result=num1-num2;
			               break;
			            case '*':
			              result=num1*num2;
			               break;
			            case '/':
			              result=num1/num2;
			          }
		 System.out.print(result);
		 ActionContext action=ActionContext.getContext();
		 action.put("result",result);
		 return "success";
	}
	@Override
	public Cal getModel() {
		// TODO Auto-generated method stub
		return cal;
	}

}

javabean

package cal;

public class Cal {
	private float num1;
	
    private String op;
    
    private float num2;

	public float getNum1() {
		return num1;
	}
	public void setNum1(float num1) {
		this.num1 = num1;
	}
	public String getOp() {
		return op;
	}
	public void setOp(String op) {
		this.op = op;
	}
	public float getNum2() {
		return num2;
	}
	public void setNum2(float num2) {
		this.num2 = num2;
	}
}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />

    <package name="default" namespace="/" extends="struts-default">

        

        <action name="calAction" class="action.calAction" method="caloption">
            <result name="success">/cal.jsp</result>
        </action>
    </package>

    

    <!-- Add packages here -->

</struts>