jdbcTemplate简单使用

 package com.bizvane.spider.tools;

 import org.apache.commons.dbcp.BasicDataSource;
 import org.springframework.jdbc.core.JdbcTemplate;

 import java.util.HashMap;
 import java.util.Map;

 /**
  * Created by Administrator on 2018/1/10.
  */
 public class JDBCHelper {
     private static Map<String,JdbcTemplate> templateMap = new HashMap<String,JdbcTemplate>();

     /**
      * 创建连接
      */
     public static JdbcTemplate createTemplate(String templateName,
                                                    String url, String username, String password,
                                                    int initialSize, int maxActive) {

         BasicDataSource dataSource = new BasicDataSource();
         dataSource.setDriverClassName("com.mysql.jdbc.Driver");
         dataSource.setUrl(url);
         dataSource.setUsername(username);
         dataSource.setPassword(password);
         dataSource.setInitialSize(initialSize);
         dataSource.setMaxActive(maxActive);
         JdbcTemplate template = new JdbcTemplate(dataSource);
         templateMap.put(templateName, template);
         return template;
     }

     /**
      *  获取 JdbcTemplate
      */
     public static JdbcTemplate getJdbcTemplate(){
         String templateName = JdbcConfig.getTemplateName();
         String url = JdbcConfig.getUrl();
         String username = JdbcConfig.getUsername();
         String password = JdbcConfig.getPassword();
         int initialSize = (JdbcConfig.getInitialSize()==null)?5:Integer.parseInt(JdbcConfig.getInitialSize());
         int maxActive = (JdbcConfig.getMaxActive()==null)?30:Integer.parseInt(JdbcConfig.getMaxActive());
         return createTemplate(templateName,url,username,password,initialSize,maxActive);
     }

     /**
      * 获取 JdbcTemplate
      */
     public static JdbcTemplate getJdbcTemplate(String templateName){
         if (templateMap.get(templateName) != null) return templateMap.get(templateName);
         JdbcTemplate template = getJdbcTemplate();
         templateMap.put(templateName, template);
         return template;
     }

 }