复数运算_request.getparameter和double.parsedouble-优快云博客

本文链接：https://blog.youkuaiyun.com/gxmmmm/article/details/94601148

本文介绍了一款复数运算器的设计与实现过程，采用jsp、javabean、servlet和dao等技术，实现了复数的加减乘除运算。通过jsp页面接收用户输入，servlet处理业务逻辑，javabean进行数据封装，dao进行数据操作。

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我用了五种方法写了

第一种：只有jsp

第二种：jsp+javabean

第三种：jsp+servlet

第四种：jsp+JavaBean+servlet

第五种：jsp+JavaBean+servlet+Dao

我只显示第五种，其他四种在第五种的基础上改改就行

jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>复数运算器</title>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
if(request.getParameter("c1")!=null)
   session.setAttribute("s1", request.getParameter("c1"));
if(request.getParameter("c2")!=null)
   session.setAttribute("s2", request.getParameter("c2"));
if(request.getParameter("c3")!=null)
   session.setAttribute("s3", request.getParameter("c3"));
if(request.getParameter("c4")!=null)
   session.setAttribute("s4", request.getParameter("c4"));
%>
<form action="../acb_jisuan_2" method="post">
<table>
<tr><td>第一个数:</td>
<tr><td>实部：<input type="text" name="x"></td></tr>
<tr><td>虚部：<input type="text" name="y"></td></tr>
<tr><td>第二个数:</td>
<tr><td>实部：<input type="text" name="x1"></td></tr>
<tr><td>虚部：<input type="text" name="y1"></td></tr>
<tr><td>请选择下面您想要运算的类型！</td></tr>
<tr><td>
<input type="checkbox" name="o" value="+">加法;
<input type="checkbox" name="o" value="-">减法;
<input type="checkbox" name="o" value="*">乘法;
<input type="checkbox" name="o" value="/">除法;
</td></tr>
<tr align="center"><td colspan="2">
<input type="submit" value="提交">  
<input type="reset" value="取消">
</td></tr>
</table>
</form>
</body>
</html>

javabean:

public class Add {
   public String add(double x,double y,double x1,double y1,String o) {
       double a = 0,b = 0;
       switch(o){
       case"+":
           a=x+x1;
       b=y+y1;
       break;
       case"-":
           a=x-x1;
           b=y-y1;
           break;
       case"*":
           a=x*x1-y*y1;
           b=x*y1+x1*y;
           break;
       case"/":
           a=(x*x1+y*y1)/(x1*x1+y1*y1);
           b=(y*x1-x*y1)/(x1*x1+y1*y1);
           break;
       }
       ppest p = new ppest();
       return p.ppest(a, b);
   }

}

package bean;

public class Dd {
   public double getA() {
       return a;
   }
   public void setA(double a) {
       this.a = a;
   }
   public double getB() {
       return b;
   }
   public void setB(double b) {
       this.b = b;
   }
   private double a;
   private double b;
   public Dd(double a, double b) {
       this.a = a;
       this.b = b;
   }
   public Dd() {}
   public String ppest() {
       String result=null;
       if(b!=0) {
       if(b>0)
           result="("+a+"+"+b+"i)";
       else
           result="("+a+b+"i)";
       }
       else
           result=""+b;
       return result;
   }
}

package bean;

public class ppest {

   public String ppest(double a, double b) {
       String result=null;
       if(b!=0) {
       if(a>0)
           result="("+a+"+"+b+"i)";
       else
           result="("+a+b+"i)";
       }
       else
           result=""+b;
       return result;
   }

}

Dao：

package bean;

public class MM {
   public String mm( Dd d1,Dd d2,String o) {
       double x=d1.getA();
       double y=d1.getB();
       double x1=d2.getA();
       double y1=d2.getB();
       double a = 0,b = 0;
       switch(o){
       case"+":
           a=x+x1;
       b=y+y1;
       break;
       case"-":
           a=x-x1;
           b=y-y1;
           break;
       case"*":
           a=x*x1-y*y1;
           b=x*y1+x1*y;
           break;
       case"/":
           a=(x*x1+y*y1)/(x1*x1+y1*y1);
           b=(y*x1-x*y1)/(x1*x1+y1*y1);
           break;
       }
       ppest p = new ppest();
       return p.ppest(a, b);
   }
}

servlet：

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       ppest p=new ppest();
       MM m = new MM();
       double x = Double.parseDouble(request.getParameter("x"));
       double y= Double.parseDouble(request.getParameter("y"));
       double x1 = Double.parseDouble(request.getParameter("x1"));
       double y1 = Double.parseDouble(request.getParameter("y1"));
       Dd d1 = new Dd(x,y);
       Dd d2 = new Dd(x1,y1);
       String o = request.getParameter("o");
       request.setAttribute("result", p.ppest(x, y) );
       request.setAttribute("result1", p.ppest(x1, y1));
       request.setAttribute("result2", m.mm(d1, d2, o));
       request.setAttribute("o", o);
       RequestDispatcher rd;
       rd=request.getRequestDispatcher("jsp+javabean+servlet+dao/e5.jsp");
       rd.forward(request, response);
   }

show.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%=request.getAttribute("result")%><%= request.getAttribute("o")%>
<%=request.getAttribute("result1")%>=<%=request.getAttribute("result2") %>
</body>
</html>

输入表单页面：将该页面的请求参数传给servlet；

封装复数运算，并完成加减乘除4种业务方法；

将servlet的信息调整到show.jsp并显示；