JDBC——setting useSSL=false, or set useSSL=true

 1 package cn.zpoor.DBTest;
 2 
 3 import java.sql.DriverManager;
 4 import java.sql.ResultSet;
 5 import java.sql.SQLException;
 6 
 7 import com.mysql.jdbc.Connection;
 8 import com.mysql.jdbc.PreparedStatement;
 9 
10 public class Students {
11     private int id;
12     private String name;
13     private String sex;
14     private int age;
15     public Students(String name, String sex, int age) {
16         this.id = 0;
17         this.name = name;
18         this.sex = sex;
19         this.age = age;
20     }
21     public int getId() {
22         return id;
23     }
24     public void setId(int id) {
25         this.id = id;
26     }
27     public String getName() {
28         return name;
29     }
30     public void setName(String name) {
31         this.name = name;
32     }
33     public String getSex() {
34         return sex;
35     }
36     public void setSex(String sex) {
37         this.sex = sex;
38     }
39     public int getAge() {
40         return age;
41     }
42     public void setAge(int age) {
43         this.age = age;
44     }
45     
46     
47     private static Connection getConn() {
48         String driver = "com.mysql.jdbc.Driver";
49         String url = "jdbc:mysql://localhost:3306/school";
50         String username = "root";
51         String password = "zhuqiong520";
52         Connection conn = null;
53         try {
54             Class.forName(driver);//加载驱动
55             conn = (Connection) DriverManager.getConnection(url, username, password);
56         } catch (ClassNotFoundException e) {
57             e.printStackTrace();
58         } catch (SQLException e) {
59             e.printStackTrace();
60         }
61         return conn;
62     }
63     
64     private static Integer getAll() {
65         Connection conn = getConn();
66         String sql = "select * from students";
67         PreparedStatement pstmt;
68         
69         try {
70             pstmt = (PreparedStatement) conn.prepareStatement(sql);
71             ResultSet rs = pstmt.executeQuery();
72             int col = rs.getMetaData().getColumnCount();
73             System.out.println("=============");
74             while(rs.next()) {
75                 for(int i = 1;i<=col;i++) {
76                     System.out.println(rs.getString(i)+"\t");
77                     if (i==2 && rs.getString(i).length()<8) {
78                         System.out.println("\t");
79                     }
80                 }
81                 System.out.println("");
82             }
83             System.out.println("============");
84         } catch (SQLException e) {
85             e.printStackTrace();
86         }
87         return null;
88     }
89     
90     public static void main(String[] args) {
91         Students.getAll();
92     }
93 }

Wed Oct 11 22:20:41 CST 2017 WARN: Establishing SSL connection 
without server‘s identity verification is not recommended. According 
to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must 
be established by default if explicit option isn‘t set. For compliance 
with existing applications not using SSL the verifyServerCertificate 
property is set to ‘false‘. You need either to explicitly disable SSL by 
setting useSSL=false, or set useSSL=true and provide truststore for server 
certificate verification.
=============
1    
朱琼    
    
男    
22    

2    
王珊珊    
    
女    
21    

============