在Servlet中使用JDBC访问数据库

UserInfo类

public class UserInfo {
	private String id;
	private String name;
	private String pwd;
	private String sex;
	private int age;
	private String email;
	public UserInfo(){}
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPwd() {
		return pwd;
	}
	public void setPwd(String pwd) {
		this.pwd = pwd;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	
	
}

LoginDao类

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;

import com.cn.zj.bean.UserInfo;
public class LoginDao {
	private static LoginDao instance = null;
	public static LoginDao getInstance(){
		if(instance == null){
			instance = new LoginDao();
		}
		return instance;
	}
	//保存用户注册信息	
	public boolean saveUser(UserInfo user){
		String sql = "insert into tb_userinfo(name,pwd,sex,age,email) values(?,?,?,?,?)";//insert SQL语句
		Connection conn = null;
		try{
			conn = MySQLDBCon.getConnection();//建立数据库连接
			PreparedStatement pstmt = conn.prepareStatement(sql);//创建PreparedStatement对象
			pstmt.setString(1, user.getName());					//为SQL语句第1个参数赋值;
			pstmt.setString(2, user.getPwd());					//为SQL语句第2个参数赋值;
			pstmt.setString(3, user.getSex());					//为SQL语句第3个参数赋值;
			pstmt.setInt(4, user.getAge());						//为SQL语句第4个参数赋值;
			pstmt.setString(5, user.getEmail());				//为SQL语句第5个参数赋值;
			pstmt.executeUpdate();								//执行insert语句
			return true;
		}catch(Exception ex){
			ex.printStackTrace();
		}finally{
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		return false;
	}
}

MySQLDBCon类

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class MySQLDBCon {
	public static void main(String[] args) {
		 Connection conn=new MySQLDBCon().getConnection();
		 System.out.println(conn);
	}

	public static Connection getConnection() {
        Connection conn = null;
        String driver = "com.mysql.jdbc.Driver";
        String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8";
        String username = "root";
        String password = "root";
        String querySql="select * from tb_userinfo";
        try {
            Class.forName(driver);
            conn = DriverManager.getConnection(url,username,password);
            if(!conn.isClosed())
                System.out.println("Succeeded connecting to the Database!");
            Statement stmt=conn.createStatement();
        	 ResultSet rs=stmt.executeQuery(querySql);
			 while(rs.next()){
				System.out.println("姓名:"+rs.getString("name")+"密码:"+rs.getInt("pwd")+"性别"+rs.getString("sex")+"年龄"+rs.getInt("age")+"Email"+rs.getString("email"));
			}
        }catch(ClassNotFoundException e) {   
            System.out.println("Sorry,can`t find the Driver!");   
            e.printStackTrace();   
        }catch(SQLException e){
            e.printStackTrace();  
        }catch (Exception e){
            e.printStackTrace();
        }finally{
            System.out.println("数据库数据成功获取！！");
        }
		return conn;
   }
}

LoginServlet类

   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;
    
    import com.cn.zj.bean.UserInfo;
    import com.cn.zj.dao.LoginDao;
    
    public class LoginServlet extends HttpServlet {
    	public void doGet(HttpServletRequest request, HttpServletResponse response)
    			throws ServletException, IOException {
    		this.doPost(request, response);
    	}
    	
    	public void doPost(HttpServletRequest request, HttpServletResponse response)
    			throws ServletException, IOException {
    
    		request.setCharacterEncoding("UTF-8");//设置请求字符编码格式
    		/**以下是获得表单提交过来的值*/
    		String name = request.getParameter("name");
    		String pwd= request.getParameter("pwd");
    		String sex = request.getParameter("sex");
    		String age = request.getParameter("age");
    		int userAge =0;
    		if(age!=null&&!age.equals("")){
    			userAge = Integer.parseInt(age);
    		}
    		String email = request.getParameter("email");
    		/**以下代码将获得的表单值封装到用户信息对象中*/
    		UserInfo user = new UserInfo();
    		user.setName(name);
    		user.setPwd(pwd);
    		user.setSex(sex);
    		user.setAge(userAge);
    		user.setEmail(email);
    		boolean res = LoginDao.getInstance().saveUser(user);//将用户注册信息保存到数据库
    		response.setContentType("text/html");
    		response.setCharacterEncoding("UTF-8");
    		PrintWriter out = response.getWriter();
    		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
    		out.println("<HTML>");
    		out.println("  <HEAD><TITLE>JDBC访问数据库</TITLE></HEAD>");
    		out.println("  <BODY>");
    		if(res){
    			out.println("<font color='green' size=2>注册成功！</font>");
    		}else{	
    			out.println("<font color='orangered' size=2>注册失败！</font>");
    		}
    		out.println("  </BODY>");
    		out.println("</HTML>");
    		out.flush();
    		out.close();
    	}
    
    	/**
    	 * Initialization of the servlet. <br>
    	 *
    	 * @throws ServletException if an error occurs
    	 */
    	public void init() throws ServletException {
    		// Put your code here
    	}
    
    }

index.jsp文件

<%@ 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>用户注册</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">
	-->
	<style type="text/css">
		table{
			font-size:12px;
			font-family: 隶书;
			color:gray;
			border: 1px green solid;
		}
		input{
			font-size:12px;
			font-family: 隶书;
			color:gray;
		}
	</style>
  </head>
  
  <body>
  
   	<form action="login" method="post">
   		<table align="center">
   			<tr>
   				<td>用户名：</td>
   				<td><input type="text" name="name" /></td>
   			</tr>
   			<tr>
   				<td>密码：</td>
   				<td><input type="password" name="pwd" /></td>
   			</tr>
   			<tr>
   				<td>性别：</td>
   				<td>
   					<input type="radio" name="sex" value="男" />男
   					<input type="radio" name="sex" value="女" />女
   				</td>
   			</tr>
   			<tr>
   				<td>年龄：</td>
   				<td><input type="text" name="age" /></td>
   			</tr>
   			<tr>
   				<td>Email：</td>
   				<td><input type="text" name="email" /></td>
   			</tr>
   			<tr>
   				<td colspan="2" align="center">
   					<input type="submit" value="注 册" />
   					<input type="reset" value="重 置" />
   				</td>
   			</tr>
   		</table>
   	</form>
  </body>
</html>

web.xml文件配置

<servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.cn.zj.servlet.LoginServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/login</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <resource-ref>
  	<description>conn</description>
  	<res-ref-name>jdbc/mysql</res-ref-name>
  	<res-type>javax.sql.DataSource</res-type>
  	<res-auth>Container</res-auth>
  </resource-ref>