我刚开始学jsp,今天写了一个javabean的例子程序,遇到了问题。程序如下:
<html><head>
<title>一个useBean动作的例子</title>
</head>
<%@ page contentType="test/html;charset=GB2312"%>
<jsp:useBean id="test" scope="session" class="dbbean.SimpleBean"/>
<body>
<center><h2>这是一个javaBean的例子</h2></center>
< %test.setString("This is a easy problem!"); %>
<p><h3><%=test.displayString()%></h3></p>
</body></html>SimpleBean.java程序:
package dbbean;
public class SimpleBean
{
String str;
public SimpleBean()
{
str="This is the inital string";
}
public void setString(String str1)
{
str="Hello! "+str1;
}
public String displayString()
{
return str;
}
}
运行时,总是弹出“保存”对话框,我的环境变量已经配好了,其他的例子程序也可以运行,但不知道为什么这个程序却不可以?哪位高手能否指教一下!
<html><head>
<title>一个useBean动作的例子</title>
</head>
<%@ page contentType="test/html;charset=GB2312"%>
<jsp:useBean id="test" scope="session" class="dbbean.SimpleBean"/>
<body>
<center><h2>这是一个javaBean的例子</h2></center>
< %test.setString("This is a easy problem!"); %>
<p><h3><%=test.displayString()%></h3></p>
</body></html>SimpleBean.java程序:
package dbbean;
public class SimpleBean
{
String str;
public SimpleBean()
{
str="This is the inital string";
}
public void setString(String str1)
{
str="Hello! "+str1;
}
public String displayString()
{
return str;
}
}
运行时,总是弹出“保存”对话框,我的环境变量已经配好了,其他的例子程序也可以运行,但不知道为什么这个程序却不可以?哪位高手能否指教一下!
{
return str;
}
改称
public String getStr()
{
return str;
}
public String displayString()
{
return str;
}
改成:
public String getDisplay()
{
return str;
}
这样就应该可以!因为JavaBean有自己的格式,必须得这样写!不这样写就会出现问题的!
public void setString(String str1)
{
str="Hello! "+str1;
}
也改成
public void setStr(String str1)
{
str="Hello! "+str1;
}
javax.servlet.ServletException: dbbean.SimpleBean.getStr()Ljava/lang/String;
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp._2_jsp._jspService(_2_jsp.java:76)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
用
<jsp:getProperty name="test" property="str" />
<jsp:setProperty name="test" property="str" value="aaaaa"/>
或者
<% test.setStr("This is a easy problem!"); %>
<%= test.getStr() %>
应该可以了吧
把javabean改称这样:public class SimpleBean
{
String str;
public SimpleBean()
{
str="This is the inital string";
}
public void setStr(String str1)
{
str="Hello! "+str1;
}
public String displayStr()
{
return str;
}
}
{
String str;
public SimpleBean()
{
str="This is the inital string";
}
public void setStr(String str1)
{
str="Hello! "+str1;
}
public String getStr()
{
return str;
}
}
public class SimpleBean implements Serializable{
private String str; public SimpleBean(){
} public void setStr(String str){
this.str = str;
} public String getStr(){
return this.str;
}
}