jsp的一个重要特性就是可以用javabean实现功能的扩展。将大部分功能放在javabean中完成，以使jsp页面程序更干净简洁、利于维护。javabean可以很方便的用来捕获页面表单的输入并完成各种业务逻辑的处理。如下就是一个hello示例：
testa.jsp页面：
<%@ page contenttype="text/html;charset=gbk" %>
<html>
<head>
<title>示例</title>
</head>
<body scroll=no>
<form name="frma" method="post" action="testb.jsp" >
<p>
你的姓名：
<input type="text" size="15" name="yourname" value="" id=yourname>
<input type="button" align="center" name="subbtn" value="提交" onclick="f_check()" id=subbtn>
</p>
</form>
</body>
</html>
<script language="javascript" type="text/javascript">
<!--
function f_check(){
if(document.forms(0).yourname.value==""){
alert("请输入姓名");
}else{
document.forms(0).submit();
}
}
-->
</script>
testb.jsp页面
<%@ page contenttype="text/html;charset=gbk" %>
<html>
<head>
<title>示例</title>
</head>
<jsp:usebean id="tbean" scope="page" class="bean.testbean" >
<jsp:setproperty name="tbean" property="*" />
</jsp:usebean>
<body scroll=no>
<form name="frmb" method="post" action="" >
<p>
<%=tbean.hello()%>
</p>
</form>
</body>
</html>
testbean.java 代码：
package bean;
public class testbean{
private string yourname = "";
public void setyourname(string yourname){
this.yourname = convertgbk(yourname);
}
public string hello(){
string strhello = "hello:"+yourname;
return strhello;
}
//汉字转换方法
public string convertgbk(string str){
string strreturn="";
try{
strreturn=new string(str.getbytes("iso-8859-1"),"gbk");
}catch(exception ex){
system.out.println("testbean.convertgbk():ex="+ex.tostring());
}
finally{
return strreturn;
}
}
}
public class testvaluebean{
private string yourname = "";
public void setyourname(string yourname){
this.yourname = convertgbk(yourname);
}
//汉字转换方法
public string convertgbk(string str){
string strreturn="";
try{
strreturn=new string(str.getbytes("iso-8859-1"),"gbk");
}catch(exception ex){
system.out.println("testbean.convertgbk():ex="+ex.tostring());
}
finally{
return strreturn;
}
}
}
工具bean
package bean;
public class testutilitybean{
public string hello(testvaluebean tvbean){
string strhello = "hello:"+tvbean.getname();
return strhello;
}
public string hello(string yourname){
string strhello = "hello:"+yourname;
return strhello;
}
}
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