tomcat下使用c3p0配置jnid数据源

• 导入c3p0jar包

  <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
      <dependency>
        <groupId>com.mchange</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.5.2</version>
      </dependency>

• 在tomcat的context.xml文件加入数据源配置

  <Resource 
          auth="Container" 
          description="DB Connection" 
          driverClass="com.mysql.jdbc.Driver" 
          maxPoolSize="100" minPoolSize="2" 
          acquireIncrement="2" 
          name="jdbc/myDB" 
          user="root" 
          password="123456" 
          factory="org.apache.naming.factory.BeanFactory" 
          type="com.mchange.v2.c3p0.ComboPooledDataSource" 
          jdbcUrl="jdbc:mysql://localhost:3306/attendance_system?characterEncoding=utf8&amp;serverTimezone=GMT%2B8" />

• 获取连接

  protected void doGet(HttpServletRequest request, HttpServletResponse response)
              throws ServletException, IOException {
          try {
              //创建上下文
              Context context=new InitialContext();
              //获取数据源
              ComboPooledDataSource comboPooledDataSource= (ComboPooledDataSource) context.lookup
                      ("java:comp/env/jdbc/myDB");
              //获取数据库连接
              Connection connection=comboPooledDataSource.getConnection();
              
              if(!connection.isClosed()){
                  System.out.println("已经连接成功");
              }
          } catch (NamingException e) {
              e.printStackTrace();
          } catch (SQLException e) {
              e.printStackTrace();
          }
      }

   

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原文：https://www.cnblogs.com/Y-wee/p/13679904.html