struts2实现加法运算

web.xml

    Struts Blank002
 
    
        struts2
        org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
    
 
    
        struts2
        /*
    
 

两个结果界面
positive.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>







代数和为非负数，其值为:${x}+${y}=${sum}

negative.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>







代数和为负数，其值为:(${x})+(${y})=(${sum})

Add类

package bean;

public class Add {
	double x,y;
	double sum;
	public Add(double x, double y) {
		super();
		this.x = x;
		this.y = y;
		sum=x+y;
	}
	public Add() {
		super();
		this.x = 0;
		this.y = 0;
	}
	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;
	}
	public double getSum() {
		return x+y;
	}
	public void setSum(double sum) {
		this.sum = sum;
	}
	
}

1.普通的Java类作为Action类与属性驱动传参

package com.action;

public class SumAction {
	double x,y;
	double sum;
	public SumAction(double x, double y) {
		super();
		this.x = x;
		this.y = y;
		this.sum=this.x+this.y;
	}
	public SumAction() {
		super();
	}
	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;
	}
	public double getSum() {
		return sum;
	}
	public void setSum() {
		this.sum = this.x+this.y;
	}
	public String qiuHe(){
		sum=x+y;
		if(sum<0)
			return "-";
		else
			return "+";
	}
}

对应的struts.xml：
为了能够开发更规范的Action类，struts2提供Action接口，并为Action接口提供了一个实现类ActionSupport

  
	
	 positive.jsp
	 negative.jsp
	
  

2.继承ActionSupport实现Action与属性驱动传承

package com.action;
import com.opensymphony.xwork2.ActionSupport;
public class SumActionSupport extends ActionSupport{
	double x;
	double y;
	double sum;
	public String execute() throws Exception{
		sum=x+y;
		if(sum<0) return "-";
		else return "+";
	}
	public SumActionSupport(double x, double y) {
		super();
		this.x = x;
		this.y = y;
		sum=x+y;
	}
	public SumActionSupport() {
		super();
	}
	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;
	}
	public double getSum() {
		return sum;
	}
	public void setSum(double sum) {
		this.sum = sum;
	}
	
	
}

对应的struts.xml：

  
	
	 positive.jsp
	 negative.jsp
	
  

3.采用模式驱动设计Action

package com.action;

import bean.Add;

import com.opensymphony.xwork2.*;

public class SumActionModelDriven extends ActionSupport implements ModelDriven{
	private Add add;
	@Override
	public Add getModel() {
		// TODO Auto-generated method stub
		add=new Add();
		return add;
	}
	public String execute() throws Exception{
		String forward=null;
		if(add.getSum()<0)
			forward="-";
		else
			forward="+";
		return forward;
	}
}

对应的struts.xml

  
	
	 positive.jsp
	 negative.jsp