JavaEE实验二

《JavaEE开发技术》课程第二周实验题目和代码。

第一题 登录系统实验

（1） 建立 3 个 JSP 页面，第 1 个页面输入用户登录信息、第 2 个页面用于检测用户登录信息、第3 个页面用于显示登录结果。
（2） 第 2 个页面中使用 JSP 脚本、jsp:forward、request 等基础语法、动作指令和内置对象。
（3） 第 3 个页面中使用 JSP 表达式和 request 内置对象。

第一个页面Login.jsp

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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 'Login.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="loginCL.jsp" method="post" name=form><br>
    
      <h1>Please input your message:</h1><br>
      
                   用户名:
     <input type="text" name="username"><br><br> 
     
                  密&nbsp;&nbsp;&nbsp;&nbsp;码:  
     <input type="password" name="password"><br><br><br><br> 
        
     <input type="submit" value="登陆" name="submit">    
     
     <input type="reset" value="重置"><br>
     
   </form>
   
   <%request.setAttribute("usertxt", " "); %>
   <%=(String)request.getAttribute("usertxt") %>
 
  </body>
</html>


第二个页面loginCL.jsp 

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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 'loginCL.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 referer = request.getHeader("Referer");
    
    //判断是否从Login页面跳转过来
    if(referer==null||!referer.equals("http://localhost:8080/Login/Login.jsp")){

        response.sendRedirect("Login.jsp");

     }
     
     //设置对客户端请求和数据库取值时的编码
     request.setCharacterEncoding("utf-8");

     response.setContentType("text/html;charset=utf-8");

     String name=request.getParameter("username");

     String password=request.getParameter("password");


     //判断登陆界面的用户名和密码，根据输入的不同情况进行不同的处理
    if(name.trim().length()!=0 && password.trim().length()!=0){

      request.setAttribute("usertxt", "正常登录！！！");

      request.getRequestDispatcher("success.jsp").forward(request, response);

      }

    else{

      request.setAttribute("usertxt", "用户名或密码错误！！！");

      request.getRequestDispatcher("Login.jsp").forward(request, response);

    }

     

%>
  </body>
</html>

```  

  第三个页面success.jsp  
```javascript
<%@ 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 'success.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)request.getAttribute("usertxt") %><br>
    <%

         String referer = request.getHeader("Referer");
          
         if(referer==null||!referer.equals("http://localhost:8080/Login/Login.jsp")){

            response.sendRedirect("Login.jsp");

          }
          
         request.setCharacterEncoding("utf-8");

         response.setContentType("text/html;charset=utf-8");
         
         String name=request.getParameter("username");

         String password=request.getParameter("password");
         
         out.println("usename: "+name+"<br>");
         
         out.println("pwd: "+password+"<br>");

    %>  
  </body>
</html>

第二题 注册学生用户信息实验

（1） 建立 3 个 JSP 页面，第 1 个页面输入学生基本信息、第 2 个页面构建一个 JavaBean 实例，并将学生信息存入到实例中、第 3 个页面用于显示学生的注册信息。注册页面内容包括：用户名、密码、性别、年龄、国别、邮箱、电话号码。
（2） 第 2 个页面中使用 jsp:useBean 和 jsp:setProperty 动作指令、request 内置对象。
（3） 第 3 个页面中使用 jsp:getProperty 动作指令。

第一个页面register.jsp

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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>
    <%
    request.setCharacterEncoding("utf-8");
    %>
    <jsp:useBean id="reg" scope="request" class="test.register"/>
    <form action="check.jsp" method="post" name=form><br>
    
      <h1>Register:</h1><br>
      
                   用户名:
     <input type="text" name="name" value="<jsp:getProperty name="reg" property="name"/>">
     <%=reg.getErrorMsg("errname") %><br><br> 
     
                  密&nbsp;&nbsp;&nbsp;&nbsp;码:  
     <input type="password" name="password" value="<jsp:getProperty name="reg" property="pwd"/>"><br><br>
     
                  性&nbsp;&nbsp;&nbsp;&nbsp;别：
     <input type="radio" id="ids" name="sex" value="男" checked="checked" />男
     <input type="radio" id="ids" name="sex" value="女" />女<br><br>

                  
                   年&nbsp;&nbsp;&nbsp;&nbsp;龄：
     <input type="text" name="age" value="<jsp:getProperty name="reg" property="age"/>">
     <%=reg.getErrorMsg("errage") %><br><br>
                  
                   国&nbsp;&nbsp;&nbsp;&nbsp;别：
     <input type="text" name="nation"><br><br>
     
                   邮&nbsp;&nbsp;&nbsp;&nbsp;箱：
     <input type="text" name="email" value="<jsp:getProperty name="reg" property="email"/>">
     <%=reg.getErrorMsg("erremail") %><br><br>
     
                   电话号码：
     <input type="text" name="phone"><br><br>
     <br><br> 
        
     <input type="submit" value="注册" name="submit">    
     
     <input type="reset" value="重置"><br>
     
   </form>
  </body>
</html>
```  

 第二个页面check.jsp
``` javascript
<%@ 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 'check.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.setCharacterEncoding("utf-8");
  %>
  
  <%--将表单数据传到Javabean实例 --%>
  <jsp:useBean id="reg" scope="request" class="test.register"/>
  <jsp:setProperty property="*" name="reg"/>
  <jsp:setProperty property="pwd" name="reg" param="password"/>
  
  <%--JavaBean中方法调用判断是否是合法输入 --%>
    if(reg.isValidate()){
     request.getRequestDispatcher("success.jsp").forward(request, response);
    }
    
    else{
    request.getRequestDispatcher("register.jsp").forward(request, response);
    }
%>

  </body>
</html>

```  

 第三个页面success.jsp
``` javascript
<%@ 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 'success.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>
  <jsp:useBean id="reg" scope="request" class="test.register"/>
  <h2>注册信息</h2><br>
  
  <%--显示注册信息从JavaBean获取 --%>  
  <table>
      <tr>
        <td>用户名</td>
        <td><jsp:getProperty property="name" name="reg"/></td>
      </tr>
    
      <tr>
        <td>密码</td>
        <td><jsp:getProperty property="pwd" name="reg"/></td>
      </tr>

      <tr>
        <td>性别</td>
        <td><jsp:getProperty property="sex" name="reg"/></td>
      </tr>    

      <tr>
        <td>年&nbsp;&nbsp;&nbsp;&nbsp;龄</td>
        <td><jsp:getProperty property="age" name="reg"/></td>
      </tr>

      <tr>
        <td>国家</td>
        <td><jsp:getProperty property="nation" name="reg"/></td>
      </tr>
    
      <tr>
        <td>E-MAIL</td>
        <td><jsp:getProperty property="email" name="reg"/></td>
      </tr>

      <tr>
        <td>手机</td>
        <td><jsp:getProperty property="phone" name="reg"/></td>
      </tr>
    </table>
  </body>
</html>


JavaBean对应的Java类 register.java

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package test;
import java.util.HashMap;
import java.util.Map;

public class register {
    private String name;    // 名字
    private String pwd;     //密码
    private String sex;     //性别
    private String age;      // 年龄   为了防止用户输入的内容不是数字时，抛出NumberFormat异常，这里使用String存储
    private String nation;   //国籍
    private String email;   // email
    private String phone;    //手机号码
    private Map<String,String> errors = null;   // 保存错误信息
    
    //初始化
    public register() {
        this.name = "";
        this.pwd = "";
        this.sex = "";
        this.age = "";
        this.nation = "";
        this.email = "";
        this.phone = "";
        this.errors = new HashMap<String,String>();
    }
    
    //判断部分属性是否合法
    public boolean isValidate() {
        boolean flag = true;
        if(!this.name.matches("\\w{6,15}")) {
            flag = false;
            this.name = ""; // 清空原本的name内容
            this.errors.put("errname", "用户名是6～15位的字母或数字");
        }
        if(!this.email.matches("\\w+@\\w+\\.\\w+\\.?\\w*")) {
            flag = false;
            this.email = "";    // 清空原本的email内容
            this.errors.put("erremail", "输入的email的地址不合法");
        }
        if(!this.age.matches("\\d+")) {
            flag = false;
            this.age = "";  // 清空原本的email内容
            this.errors.put("errage", "年龄只能是数字");
        }
        return flag;
    }
    
    //获取错误提示信息
    public String getErrorMsg(String key) {
        String value = this.errors.get(key);
        return value==null?"":value;
    }
    
    //姓名的获取和设置
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    
  //密码的获取和设置
    public String getPwd() {
        return pwd;
    }
    public void setPwd(String pwd) {
        this.pwd = pwd;
        System.out.println("setPWD:"+this.pwd);
    }
    
  //年龄的获取和设置
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    
  //性别的获取和设置
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    
  //国籍的获取和设置
    public String getNation() {
        return nation;
    }
    public void setNation(String nation) {
        this.nation = nation;
    }
    
  //错误的获取和设置
    public Map<String, String> getError() {
        return errors;
    }
    public void setError(Map<String, String> error) {
        this.errors = error;
    }
    
  //邮箱的获取和设置
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
   
  //手机号码的获取和设置
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
}

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