jsp+servlet小练习

来源：互联网发布：网站美工是做什么的编辑：程序博客网时间：2024/05/01 10:54

写一个注册，注册页面用jsp写jsp里面有username，password，惹psssword，age。提交之后转到servlet。servlet：判断password==repassword和age>18,如果都符合，显示success。不成功：1，！password==repassword。2age<18或者两个都显示

1，jsp代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%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 'register.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>     <form action="result.jsp">                    用户名=<input type="text" name="username1"><br>                    密码=<input type="password" name="password1"><br>                    确认密码=<input type="password" name="repassword1"><br>                    年龄=<input type="text" name="age1"><br>        <input type="submit" value="submit">&nbsp;&nbsp;&nbsp;&nbsp;        <input type="reset" value="reset">    </form>  </body></html>

2,servlet代码如下

package firstservlet;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 RegisterServlet extends HttpServlet{    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException    {        String username=request.getParameter("username");        String password=request.getParameter("password");        String repassword=request.getParameter("repassword");        int age=Integer.parseInt(request.getParameter("age"));        String result="";        if(password.equals(repassword)&&age>18)        {            result+="success";        }        if(!password.equals(repassword))        {            result+="password!=repassword";        }        if(age<=18)        {            result+="age<18";        }        response.setContentType("text/html");        PrintWriter out = response.getWriter();        out.println("<HTML>");        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");        out.println("  <BODY>");        out.print("<h1> "+result+"<h1>");        out.println("  </BODY>");        out.println("</HTML>");        out.flush();        out.close();    }}

在编写servlet时，可以直接创建一个servlet。相关的doget和dopost方法，以及xml配置都会自动生成，其效果和手写是一样的。

我们将注册的结果提交给jsp，用jsp获取用户输入的信息，并将其显示出来。新建一个result.jsp
只需在register.jsp中form的action设置为result.jsp
该jsp的代码为：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%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 'result.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>  <%  String username=request.getParameter("username1");      String password=request.getParameter("password1");      String repassword=request.getParameter("repassword1");      int age=Integer.parseInt(request.getParameter("age1"));      out.println("username:"+username+"<br>");      out.println("password:"+password+"<br>");      out.println("repassword"+repassword+"<br>");      out.println("age:"+age+"<br>"); %>  </body></html>

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