Netbeans 和 mysql communication

Question

我为我们公司创建了一个应用程序。起初，我尝试在MySQL-xampp中创建无密码数据库，效果很好。现在我的问题是，我在数据库上设置了一个密码，现在每当我登录时，我的应用程序都会向我显示以下错误:

SQL java.sql.SQLException:拒绝用户' root'@'CITSP-MOB7 '(使用密码:是)的访问

我还在连接数据库时遇到错误：

无法连接。无法使用com.mysql.jdbc.Driver建立到JDBC:MySQL//localhost:3306/mydb的连接(拒绝用户' root'@'CITSP-MOB7 '(使用密码:YES)的访问)。

static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://192.168.1.112:3306/citsp";
static final String USER = "root";
static final String PASS = "mypassword";

try{
   Class.forName("com.mysql.jdbc.Driver");
  }catch(ClassNotFoundException ex){
            }
  //STEP 3: Open a connection
  System.out.println("Connecting to database...");
  conn = DriverManager.getConnection(DB_URL,USER,PASS);

  //STEP 4: Execute a query
  System.out.println("Creating statement...");
  stmt = conn.createStatement();

Answer 1

如果这对你有用，请在mysql中测试创建一个新用户。

首先在mysql中创建一个新用户：以root身份从mysql命令行登录。然后逐个运行以下命令。

我的SQL

将.上的所有权限授予“mydbuser”@“localhost”；

冲洗特权;

爪哇岛

        String JDBC_DRIVER = "com.mysql.jdbc.Driver";
        String DB_URL = "jdbc:mysql://localhost/citsp";
        String USER = "mydbuser";
        String PASS = "asdf";

        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException ex) {
            //JOptionPane.showMessageDialog(null, "There's an error connecting with the database. Please contact your administrator.");
        }
        //STEP 3: Open a connection
        System.out.println("Connecting to database...");
        java.sql.Connection conn = null;
        try {
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
        } catch (SQLException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
            ex.printStackTrace();
        }

        //STEP 4: Execute a query
        System.out.println("Creating statement...");
        try {
            Statement stmt = conn.createStatement();
            String query = "";
            ResultSet rs = stmt.executeQuery(query);
            while(rs.next()){
                // Iterate through the result
            }
        } catch (SQLException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        }