12-11-07 jsp小结-优快云博客

本文链接：https://blog.youkuaiyun.com/lovedushuai521/article/details/8160107

使用jsp+servlet完成一个表单验证，通过表单提交信息给Servlet，Servlet获取到信息后，处理，把信息放到request对象中，如果用户提交的姓名为空，不能跳转，否则，将信息全部显示出来。

1.jsp

<table align="center">
<tr><td>username</td><td></td></tr>
<tr><td>sex</td><td>boysgirl</td></tr>
<tr><td>addres</td><td></td></tr>
<tr><td>likes</td><td>singdancegame</td></tr>
<tr><td> </td><td></td></tr>
</table>
Servlet
package com.hbsi.Jsp;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class JSPServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
request.setAttribute("username", username);
if(username!=null){
String sex = request.getParameter("sex");

String xin = request.getParameter("xin");
String c1 = request.getParameter("c1");
String c2 = request.getParameter("c2");
String c3 = request.getParameter("c3");

request.setAttribute("sex", sex);
request.setAttribute("xin", xin);
request.setAttribute("c1", c1+"");
request.setAttribute("c2", c2+"");
request.setAttribute("c3", c3+"");
request.getRequestDispatcher("/2.jsp").forward(request, response);
}

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doGet(request,response);
}

}
2.jsp

<body>
<form method="post">
<tr><%=request.getParameter("username") %></tr>
<tr><%=request.getParameter("sex") %></tr>
<tr><%=request.getParameter("xin") %></tr>
<tr><%=request.getParameter("c1") %></tr>
<tr><%=request.getParameter("c2") %></tr>
<tr><%=request.getParameter("c3") %></tr>
</form>
</body>