MySQL classNotFoundException＆找不到適用於jdbc的驅動程序

我是學習JSP的新手。我加入這個jar文件mysql-connector-java-5.1.38-bin.jar mysql-connector MySQL classNotFoundException＆找不到適用於jdbc的驅動程序

的IML文件：

<CLASSES> 
     <root url="jar://$USER_HOME$/Downloads/mysql-connector-java-5.1.38/mysql-connector-java-5.1.38/mysql-connector-java-5.1.38-bin.jar!/" /> 
</CLASSES>

我做了一個類的表是這樣的：

package test; 
public class Student { 
    private int id; 
    private String name; 

    public int getId(){ 
    return id; 
    } 

    public void setId(int id){ 
    this.id = id; 
    } 

    public String getName(){ 
    return name; 
    } 

    public void setName(String name){ 
    this.name = name; 
    } 

    public Student(int id,String name){ 
    super(); 
    this.name = name; 
    this.id = id; 
    } 
}

和經營類：

package test; 
import java.sql.*; 
import java.sql.DriverManager; 
import java.sql.SQLException; 
import java.util.ArrayList; 
import java.util.List; 
public class StudentOperation { 
public List readStudent(){ 
    List<Student> list = new ArrayList<>(); 
    com.mysql.jdbc.Connection connection = null; 
    PreparedStatement preparedStatement = null; 
    ResultSet resultSet = null; 

    try{ 
     Class.forName("com.mysql.jdbc.Driver"); 
    }catch (ClassNotFoundException e){ 
     e.printStackTrace(); 
    } 
    try{ 
     connection = (com.mysql.jdbc.Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root",null); 
     String sql = "SELECT * FROM student WHERE student_id>=?"; 
     preparedStatement = connection.prepareStatement(sql); 
     preparedStatement.setInt(1,1); 
     resultSet = preparedStatement.executeQuery(); 
     while(resultSet.next()){ 
      String studentName = resultSet.getString("student_name"); 
      int studentId = resultSet.getInt("student_id"); 
      Student student = new Student(studentId,studentName); 
      list.add(student); 
     } 
    }catch (SQLException e){ 
     e.printStackTrace(); 
    }finally { 
     try{ 
      if(resultSet!=null){ 
       resultSet.close(); 
      } 
      if(preparedStatement!=null){ 
       preparedStatement.close(); 
      } 
      if(connection!=null){ 
       connection.close(); 
      } 
     }catch (SQLException e){ 
      e.printStackTrace(); 
     } 
    } 
    return list; 
} 
public static void main(String[] args){ 
    StudentOperation studentOperation = new StudentOperation(); 
    List<Student> list = studentOperation.readStudent(); 
    System.out.println(list.size()); 
    for(Student student : list){ 
     System.out.println(student.getName()+"\t"); 
     System.out.println(student.getId()); 
    } 
} 
}

運行主要方法如下：

3 
student3  
201592385 
student2  
201592386 
student1  
201592387

這是正確的結果。但是，當我加入到JSP文件：

<%@ page contentType="text/html;charset=UTF-8" language="java" %> 
<%@ page import="test.Student" %> 
<%@ page import="test.StudentOperation" %> 
<%@ page import="java.util.List" %> 
<html> 
    <head> 
    <title>Homework</title> 
    </head> 
<body> 
    <h1 align="center">Student Database</h1> 

    <table border="1"> 
    <tr> 
     <td>Student Name</td> 
     <td>Student ID</td> 
    </tr> 
<% 
try { 
    StudentOperation studentOperation = new StudentOperation(); 
    List<Student> list = studentOperation.readStudent(); 
    for(Student student : list){ %> 
<tr> 
    <td><%= student.getName() %></td> 
    <td><%= student.getId() %></td> 
</tr> 
<%  } 
}catch (Exception e){e.printStackTrace();} 
%> 
    </table> 
</body> 
</html>

它是這樣的： the result 而拋出異常：

java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/student 

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

有什麼不對？

來源

2016-04-28 WOC666

因此，您是否嘗試將「java.sql.SQLException：找不到合適的驅動程序」轉儲到您最喜愛的搜索引擎中，並通過幾十個關於完全相同問題的現有stackoverflow問題進行了解讀？ – Gimby

把司機的罐子在服務器lib文件夾

即在（$ CATALINA_HOME/lib目錄），然後檢查。希望它有幫助

來源

2016-04-28 11:49:46

它的工作原理！非常感謝。你能告訴我是什麼原因導致了這個問題？ – WOC666

因爲在應用程序被實例化之前，必須設置連接池。 –

MySQL classNotFoundException＆找不到適用於jdbc的驅動程序

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