struts2 传值之2域模式（DomainModel）

男娘i 2022-06-07 03:47 178阅读 0赞

struts2的传值方式2域模式也叫DomainModel

总的来说首先你需要建一个要存储得javabean   cal类把num1、num2和op封装

然后在jsp页面写表单把要传的值写上，在Action页面声明这个类并且为这个类创建set和get方法，

Cal类不需要显式的实例化,struts会自动帮你实例化,但前提条件是,传值时需要使用  对象名.参数名  的方式进行传递

.jsp

Action

package action;
    
    import cal.Cal;
    
    import com.opensymphony.xwork2.ActionContext;
    import com.opensymphony.xwork2.ActionSupport;
    
    public class calAction extends ActionSupport {
    	private Cal cal;
    	
    	public Cal getCal() {
    		return cal;
    	}
    
    	public void setCal(Cal cal) {
    		this.cal = cal;
    	}
    
    	public String cal(){
    		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";
    	}
    	
    }

.java(Bean)

package cal;
    
    public class Cal {
    	private float num1;
        private String op;
        private float num2;
        private float result;
    	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;
    	}
    	public float getResult() {
    		return result;
    	}
    	public void setResult(float result) {
    		this.result = result;
    	}
        
    }

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="cal">
                <result name="success">/cal.jsp</result>
            </action>
        </package>
    
        
    
        
    
    </struts>

好了这就是DomainModel