主题：servlet调用javabean的问题。
bluenice
[专家分：50] 发布于 2007-02-02 17:18:00
我想在servlet中用javabean的setter方法把数据写到javabean中，然后跳转到另一个
jsp页面，此jsp页面从javabean中把刚才serlvet写进去的数据getter出来。
可是问题是：在jsp中getter不到刚才servlet写入的数据，而是空值。
请问如何解决？？注：必须要在servlet中把数据写入到javabean中
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沙发
adler [专家分：890] 发布于 2007-02-02 23:44:00
page1:
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request
.getContextPath();
String basePath = request
.getScheme() + "://" + request
.getServerName() + ":" + request
.getServerPort() + path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'page1.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
This is my JSP page.
<br>
<form action="sends" method="post">
<input type="text" name="param"/>
<input type="submit" name="submit" value="commit"/>
</form>
</body>
</html>
page2:
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'page2.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%=request.getParameter("param")%>
</body>
</html>
servlet:
package servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import form.ParamForm;
public class MyServlet
extends
HttpServlet {
/**
* --
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException,
IOException {
// TODO Auto-generated method stub
super
.doGet(
request,
response);
}
@Override
protected void doPost(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException,
IOException {
ParamForm param=new ParamForm();
param.setParam(request.getParameter("param"));
request.setAttribute("param", param.getParam());
request.getRequestDispatcher("page2.jsp").forward(request, response);
}
}
Form:
package form;
public class ParamForm {
private String param;
public ParamForm() {
param="";
}
public String getParam() {
return param;
}
public void setParam(
String param) {
System.out.println(save(param)?"the date is saved!":"the date is not saved!");
this.param = param;
}
@Override
public String toString() {
return "[param:"+param+"]";
}
public boolean save(String data){
//数据库处理操作
return true;
}
}
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