javaweb+servlet+mysql+ajax+json+echarts简单实例

MySQL数据库设计

 

 

数据库名user1

 

项目结构

 

 

 

util层

DBUtil.java

 1 package util;
 2 
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 
 6 public class DBUtil {
 7     
 8     private static String Driver = "com.mysql.jdbc.Driver";
 9     private static String url = "jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=utf8";
10     private static String user = "root";
11     private static String psd = "root";
12     private static Connection conn = null;
13     
14     // 连接数据库
15     public static Connection getConnection() {
16         if (conn == null) {
17             try {
18                 Class.forName(Driver);
19                 conn = DriverManager.getConnection(url, user, psd);
20                 System.out.println("开始数据库连接");
21             } catch (Exception e) {
22                 e.printStackTrace();
23             }
24         }
25         return conn;
26     }
27     
28     // 关闭数据库连接
29     public static void CloseConnection() {
30         if (conn != null) {
31             try {
32                 conn.close();
33                 System.out.println("关闭数据库连接");
34             } catch (Exception e) {
35                 e.printStackTrace();
36             }  
37         }
38     }
39 }

DBUtil.java