这是我写的Bean,但是对应的Cal.jsp总是出错,求哥哥姐姐们帮忙
package com;
public class Cal1 {
private String text1;
private String text2;
private String[] select;
private String s;
private int a=Integer.parseInt(text1);
private int b=Integer.parseInt(text2);
public Cal1(){}
public void setText1(String text1) {
this.text1 = text1;
}
public String getText1() {
return text1;
}
public void setText2(String text2) {
this.text2 = text2;
}
public String getText2() {
return text2;
}
public void setSelect(String[] select){
for(int i=0;i<select.length;i++)
this.s = select[i];
}
public String[] getSelect() {
return select;
}
public void setAdd(int a,int b){
this.a=a;
this.b=b;
}
public int getAdd(){
if(s.equals("+"))
{return a+b;}
if(s.equals("-"))
{return a-b;}
if(s.equals("*"))
{return a*b;}
if(s.equals("/"))
{return a/b;}
return 0;
}
}
package com;
public class Cal1 {
private String text1;
private String text2;
private String[] select;
private String s;
private int a=Integer.parseInt(text1);
private int b=Integer.parseInt(text2);
public Cal1(){}
public void setText1(String text1) {
this.text1 = text1;
}
public String getText1() {
return text1;
}
public void setText2(String text2) {
this.text2 = text2;
}
public String getText2() {
return text2;
}
public void setSelect(String[] select){
for(int i=0;i<select.length;i++)
this.s = select[i];
}
public String[] getSelect() {
return select;
}
public void setAdd(int a,int b){
this.a=a;
this.b=b;
}
public int getAdd(){
if(s.equals("+"))
{return a+b;}
if(s.equals("-"))
{return a-b;}
if(s.equals("*"))
{return a*b;}
if(s.equals("/"))
{return a/b;}
return 0;
}
}
calculate.jsp
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="calculator" scope="request" class="com.SimpleCalculator">
<jsp:setProperty name="calculator" property="*"/>
</jsp:useBean>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<hr>
计算结果:<%
try
{calculator.calculate();
out.println(calculator.getFirst()+calculator.getOperator()+calculator.getSecond()+"="+calculator.getResult());
}
catch(Exception e)
{
out.println(e.getMessage());
}
%>
<hr>
<form action="calculate.jsp" method=get>
<table width="75%" border="1" bordercolor="#003300">
<tr bgcolor="#999999">
<td colspan="2">简单的计数器</td>
</tr>
<tr>
<td>第一个参数</td>
<td><input type=text name="first"></td>
</tr>
<tr>
<td>操作符</td>
<td><select name="operator">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
</td>
</tr>
<tr>
<td>第二个参数</td>
<td><input type=text name="second"></td>
</tr>
<tr>
<td colspan="2" bgcolor="#CCCCCC"><input type=submit value=计算></td>
</tr>
</table>
</form>
</body>
</html>
下面是java文件:
package com;
public class SimpleCalculator
{
//属性声明
private String first;//第一个操作数
private String second;//第二个操作数
private double result;//操作结果
private String operator;//操作符
/**
*以下是一些属性方法
*/
public void setFirst(String first)
{
this.first=first;
}
public void setSecond(String second)
{
this.second=second;
}
public void setOperator(String operator)
{
this.operator=operator;
}
public String getFirst()
{
return this.first;
}
public String getSecond()
{
return this.second;
}
public String getOperator()
{
return this.operator;
}
//获得计算结果
public double getResult()
{
return this.result;
}
/**
*根据不同的操作符进行计算
*/
public void calculate()
{
double one=Double.parseDouble(first);
double two=Double.parseDouble(second);
try
{
if(operator.equals("+")) result=one+two;
else if(operator.equals("-"))result=one-two;
else if(operator.equals("*"))result=one*two;
else if(operator.equals("/"))result=one/two;
}
catch(Exception e)
{
System.out.println(e);
}
}
}