JSP页面代码如下
- Java code
<%@ page import="java.sql.*" %><%@ page import="java.lang.*" %><%@page contentType="text/html" pageEncoding="GB2312"%><!DOCTYPE html><BODY> <P>输入姓名: <FORM action="Count" method="get"> <INPUT type=text name=number> <INPUT type=submit value="提交"> <% String rea1 = request.getPatameter("read"); out.print(read1); %> </FORM></body>servlet代码如下
- Java code
public class Count extends HttpServlet { public void service(HttpServletRequest req,HttpServletResponse res)throws IOException { String read = "darc"; PrintWriter out = res.getWriter(); res.setContentType("text/html;charset=GB2312"); String number = req.getParameter("number"); req.setCharacterEncoding("gbk"); out.print("<BR>"+"hello"+number); }}目的就是想让servlet中定义的String read参数传到JSP页面中显示出来,JSP页面打印出来的read1是null,请问代码有什么问题
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request.setAttubute("read",read);
request.getRequestDispatcher("/url").forward(request,response);
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servlet里把read放到request里，在页面用你的方法取就好，你现在只是取，但还没有放进去，所以是空值
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Servlet要这样写才能跳转向jsp文件，你的写法两个文件根本无关
request.setAttubute("read",read);
//假设你的jsp文件名称是:test.jsp
request.getRequestDispatcher("test.jsp").forward(request,response);
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request.setAttubute("read",read); 存到作用域里面去了
JSP才能获得这个read的值