很多人都想办法了，可找不到原因！该怎么处理
日期：2014-05-18 浏览次数：20714 次
很多人都想办法了，可找不到原因！
MathBeab.java
___________________________________________________
package test;
public class MathBean {
private String a;
private String b;
private double result;
private String operator;
public String getA() {
if(a==null)
a= " ";
return a;
}
public void setA(String a) {
this.a = a;
}
public String getB() {
if(b==null)
b= " ";
return b;
}
public void setB(String b) {
this.b = b;
}
public String getOperator() {
return operator;
}
public void setOperator(String operator) {
this.operator = operator;
}
public double getResult() {
return result;
}
public void forResult() {
double one=Double.parseDouble(a);
double two=Double.parseDouble(b);
try {
if (this.equals( "+ ")) result=one+two;
else if (this.equals( "- ")) result=one-two;
else if (this.equals( "* ")) result=one*two;
else if (this.equals( "/ ")) result=one/two;
} catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
}
}
___ForRrsult.JSP________________________________________
<%@ page language= "java " contentType= "text/html;charset=gb2312 "%>
<%@ page import= "java.sql.* "%>
<jsp:useBean id= "forResult "class= "test.MathBean "scope= "request ">
<jsp:setProperty name= "forResult " property= "* "/>
</jsp:useBean>
<html>
<head>
<meta http-equiv= "content-type " content= "text/html; charset=gb2312 "/>
<title> 一简单的计数器 </title>
</head>
<body> <center>
<form action= "forResult.jsp " method= "POST ">
<table border= "1 " width= "300 "bgcolor= "#ffffc0 ">
<tr> <td> 计算结果 </td>
<%
try{forResult.forResult();}
catch(
MathBeab.java
___________________________________________________
package test;
public class MathBean {
private String a;
private String b;
private double result;
private String operator;
public String getA() {
if(a==null)
a= " ";
return a;
}
public void setA(String a) {
this.a = a;
}
public String getB() {
if(b==null)
b= " ";
return b;
}
public void setB(String b) {
this.b = b;
}
public String getOperator() {
return operator;
}
public void setOperator(String operator) {
this.operator = operator;
}
public double getResult() {
return result;
}
public void forResult() {
double one=Double.parseDouble(a);
double two=Double.parseDouble(b);
try {
if (this.equals( "+ ")) result=one+two;
else if (this.equals( "- ")) result=one-two;
else if (this.equals( "* ")) result=one*two;
else if (this.equals( "/ ")) result=one/two;
} catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
}
}
___ForRrsult.JSP________________________________________
<%@ page language= "java " contentType= "text/html;charset=gb2312 "%>
<%@ page import= "java.sql.* "%>
<jsp:useBean id= "forResult "class= "test.MathBean "scope= "request ">
<jsp:setProperty name= "forResult " property= "* "/>
</jsp:useBean>
<html>
<head>
<meta http-equiv= "content-type " content= "text/html; charset=gb2312 "/>
<title> 一简单的计数器 </title>
</head>
<body> <center>
<form action= "forResult.jsp " method= "POST ">
<table border= "1 " width= "300 "bgcolor= "#ffffc0 ">
<tr> <td> 计算结果 </td>
<%
try{forResult.forResult();}
catch(
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