tax.java

一个简易的留言版（jsp+mysql）。

package demo;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class Tax extends HttpServlet{
	protected void service(HttpServletRequest req,
							HttpServletResponse resp)
				throws ServletException,IOException{
		String num = req.getParameter("num");
		PrintWriter out = resp.getWriter();
		try{
			double income = Double.parseDouble(num);
			double tax = 0.0;
			double amount = income - 1600;
			if(amount>0){
				if(amount<=500){
					tax = amount*0.05;
				}else if(amount<=2000){
					tax = 25 + (amount-500)*0.1;
				}else if(amount<=5000){
					tax = 175 + (amount-2000)*0.15;
				}else if(amount<=20000){
					tax = 625 + (amount-5000)*0.2;
				}else if(amount<=40000){
					tax = 3650 + (amount-20000)*0.25;
				}else if(amount<=60000){
					tax = 8650 + (amount-40000)*0.3;
				}else if(amount<=80000){
					tax = 14650 + (amount-60000)*0.35;
				}else if(amount<=100000){
					tax = 21650 + (amount-80000)*0.4;
				}else{
					tax = 29650 + (amount-100000)*0.45;
				}
			}
			out.println("Income:"+num+" tax:"+tax);
		}catch(NumberFormatException nfe){
			out.println(num+" is invalid!");
		}
	}
	
}