jsp+servlet小练习

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我是靠谱客的博主任性便当，这篇文章主要介绍jsp+servlet小练习，现在分享给大家，希望可以做个参考。

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：

复制代码

<%@ 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>

</head>

</form>
  </body>
</html>

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<%@ 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

复制代码

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();
    }

}

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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：

复制代码

<%@ 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>

</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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<%@ 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>