(1) 05_01.jsp 存放路径为C:\Program Files\Apache Group\Tomcat 4.1\webapps\examples<html>
<head>
<title>一个简单的使用JavaBean的例子</title>
</head>
<%@page contentType="text/html; charset=gb2312"%>
<jsp:useBean id="mybean" class="test.MyBean" />
<body>
<h2>这是一个使用JavaBean的简单例子。</h2>
<%!
String str1="这里调用了JavaBean中的方法。";
String str2="不是吗?";
%>
<%
mybean.setValue(str1);
str2=mybean.getValue()+str2;
%>
<h3>
<%=str2%>
</h3>
</body>
</html>(2) MyBean.java,它编译成的MyBean.class文件存放路径C:\Program Files\Apache Group\Tomcat 4.1\webapps\examples\WEB-INF\classes\test,没错吧,是WEB-INF\classes下呀!package test;
public class MyBean{
private String str;
private int num;
//初始化
public MyBean(){
str="This is the initial value.";
num=0;
}
//设置str
public void setvalue(String avalue){
str=avalue;
}
//得到str
public String getvalue() {
return str;
}
//设置number
public void setnumber(int Number)
{
num=Number;
}
//得到number
public int getnumber()
{
return num;
}
}错误结果是:
org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 12 in the jsp file: /05_01.jspGenerated servlet error:
[javac] Compiling 1 source fileC:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\examples\_05_01_jsp.java:71: cannot resolve symbol
symbol : method setValue (java.lang.String)
location: class test.MyBean
mybean.setValue(str1);
^
An error occurred at line: 12 in the jsp file: /05_01.jsp
Generated servlet error:
C:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\examples\_05_01_jsp.java:72: cannot resolve symbol
symbol : method getValue ()
location: class test.MyBean
str2=mybean.getValue()+str2;
^
2 errors
请大家帮我看看,问题出在哪呀,我运行examples里的javabean都可以呀,说明servlet没有问题吧,都不知道怎么回事,真是郁闷呀,都好长一段时间了,就是找出毛病在哪?
<head>
<title>一个简单的使用JavaBean的例子</title>
</head>
<%@page contentType="text/html; charset=gb2312"%>
<jsp:useBean id="mybean" class="test.MyBean" />
<body>
<h2>这是一个使用JavaBean的简单例子。</h2>
<%!
String str1="这里调用了JavaBean中的方法。";
String str2="不是吗?";
%>
<%
mybean.setValue(str1);
str2=mybean.getValue()+str2;
%>
<h3>
<%=str2%>
</h3>
</body>
</html>(2) MyBean.java,它编译成的MyBean.class文件存放路径C:\Program Files\Apache Group\Tomcat 4.1\webapps\examples\WEB-INF\classes\test,没错吧,是WEB-INF\classes下呀!package test;
public class MyBean{
private String str;
private int num;
//初始化
public MyBean(){
str="This is the initial value.";
num=0;
}
//设置str
public void setvalue(String avalue){
str=avalue;
}
//得到str
public String getvalue() {
return str;
}
//设置number
public void setnumber(int Number)
{
num=Number;
}
//得到number
public int getnumber()
{
return num;
}
}错误结果是:
org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 12 in the jsp file: /05_01.jspGenerated servlet error:
[javac] Compiling 1 source fileC:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\examples\_05_01_jsp.java:71: cannot resolve symbol
symbol : method setValue (java.lang.String)
location: class test.MyBean
mybean.setValue(str1);
^
An error occurred at line: 12 in the jsp file: /05_01.jsp
Generated servlet error:
C:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\examples\_05_01_jsp.java:72: cannot resolve symbol
symbol : method getValue ()
location: class test.MyBean
str2=mybean.getValue()+str2;
^
2 errors
请大家帮我看看,问题出在哪呀,我运行examples里的javabean都可以呀,说明servlet没有问题吧,都不知道怎么回事,真是郁闷呀,都好长一段时间了,就是找出毛病在哪?
public int getNum() {
return num;
} public void setNum(int num) {
this.num = num;
} public String getStr() {
return str;
} public void setStr(String str) {
this.str = str;
}
public void setValue(String avalue){
str=avalue;
}
//得到str
public String getValue() {
return str;
}-- 注意要大写
str=avalue;
}
应该调用mybean.setvalue(str1);
而不是
mybean.setValue(str1);