JSP实现HTML网页管理Mysql数据库
Posted WillWinwin
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使用JSP实现html网页管理mysql数据库主要有以下几个地方需要注意：
- 使用request.getParamater获取到输入的值
- 对输入数值的一些逻辑判断
- Mysql的语法操作
- 编写一个好看的HTML界面
- you win
<%@page import="java.sql.Connection,java.sql.Statement,java.util.Scanner,java.sql.*"%>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
String msg="";
boolean error=false;
获取是否点击了保存按钮
String s1 = request.getParameter("save");
if(s1!=null)
初始化数据库表中的属性
String Id = "";
String Name = "";
String Age = "";
String Grade = "";
String Hobby[]= "";
String Hobbies = "";
使用循环是因为想要判断是否有属性为空，如果为空就直接跳出去不用执行接下来的语句
for(int j = 0 ; j < 1 ; j++)
Id = "";
Name = "";
Age = "";
Grade = "";
Hobbies = "";
if(request.getParameter("Id")!=null)
Id = request.getParameter("Id");
**判断Id是否为空需要按照实际情况，比如有时候是Id == null**
if(Id == "")
error = true;
msg = "ID cant be empty!";
break;
if(request.getParameter("Name")!=null)
Name = request.getParameter("Name");
if(Name == "")
error = true;
msg = "Name cant be empty!";
break;
if(request.getParameter("Age")!=null)
Age = request.getParameter("Age");
if(Age == "")
error = true;
msg = "Age cant be empty!";
break;
if(request.getParameter("Grade")!=null)
Grade = request.getParameter("Grade");
if(Grade == "")
error = true;
msg = "Grade cant be empty!";
break;
if(request.getParameter("Hobby")!=null)
Hobby = request.getParameterValues("Hobby");
int len = Hobby.length;
for(int i = 0 ; i < len ; i++)
if(i==0)
if(len==1)
Hobbies = Hobby[0];
else
Hobbies = Hobbies + Hobby[i] + "+";
else if(i == (len-1))
Hobbies = Hobbies + Hobby[i];
else
Hobbies = Hobbies + Hobby[i] + "+";
if(Hobbies == null)
error = true;
msg = "Hobby cant be empty!";
break;
if(!error)
连接数据库
try
String connectString = "jdbc:mysql://localhost/test"
+ "?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8";
String user = "root";
String pwd = "mysql";
获取所有的数值
String sql = "select *from stu where id = '" + Id + "';";
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection(connectString, user, pwd);
Statement state = conn.createStatement();
ResultSet rs = state.executeQuery(sql);
判断Id是否唯一
if(rs.next())
msg="The user exits!";
error = true;
if(!error)
执行插入操作
sql = "insert into stu values ('" + Id + "','" + Name + "','" + Age + "','"
+ Grade + "','" + Hobbies + "');";
int cnt = state.executeUpdate(sql);
if(cnt > 0)
msg = "The user is added!";
else
msg = "Add Error!";
rs.close();
state.close();
conn.close();
catch (Exception e)
e.printStackTrace();
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style type="text/css">
.black
color:#000;
.grey
color:#b3b3b3;
a:link,a:visiter
color:blue;
#Main
margin:auto;
width:500px;
text-align: center;
</style>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<div id="Main">
<h1>新增学生记录</h1>
<form action="addStu.jsp" method="post">
学号：
<input type = "text" name = "Id" >
<br />
<br />
姓名：
<input type = "text" name = "Name">
<br />
<br />
年龄：
<input type = "text" name = "Age">
<br />
<br />
请选择你的年级：
<br />
<select name="Grade">
<option value="freshman">大学一年级</option>
<option value="shophomore">大学二年级</option>
<option value="junior" selected="selected">大学三年级</option>
<option value="senior">大学四年级</option>
</select>
<br />
<br />
请选择你的爱好：
<br />
<input type="checkbox" name="Hobby" value="sports">
sports
<input type="checkbox" name="Hobby" value="travel">
travel
<input type="checkbox" name="Hobby" value="music">
music
<br />
<br />
<br />
<br />
<input type = "submit" name = "save" value = "保存">
<br />
<br />
<br />
<br />
</form>
将结果的信息输出来
<p><%=msg %></p>
<br />
<br />
<a href= 'browseStu.jsp?pgno=1&pgcnt=4'>返回</a>
</div>
</body>
</html>示例：
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