dbcp最终版本

Posted 2020-10-26 evil_liu

工具类：

 1 package com.jd.lastVersonJdbc;
 2 
 3 
 4 import org.apache.commons.dbcp2.BasicDataSource;
 5 import org.apache.commons.dbcp2.BasicDataSourceFactory;
 6 import org.junit.Test;
 7 
 8 import javax.sql.DataSource;
 9 import java.util.Properties;
10 
11 
12 public class JdbcUtils {
13 
14       static   DataSource  getMyDataSource() throws  Exception{
15         Properties prop=new Properties();
16         prop.load(JdbcUtils.class.getClassLoader().getResourceAsStream("jdbc.properties"));
17         System.out.println(prop);
18         BasicDataSource ds=BasicDataSourceFactory.createDataSource(prop);//自动解析properites文件。
19 
20         ds.setMaxIdle(2);
21         ds.setMaxTotal(12);
22         ds.setInitialSize(6);
23     return ds;
24 }
25 }

 测试：

 1 package com.jd.lastVersonJdbc;
 2 
 3 import org.apache.commons.dbutils.QueryRunner;
 4 import org.apache.commons.dbutils.handlers.MapListHandler;
 5 
 6 
 7 import javax.sql.DataSource;
 8 import java.util.List;
 9 import java.util.Map;
10 
11 public class testJdbc {
12     public  static void  main(String ... args)throws Exception{
13         DataSource ds= JdbcUtils.getMyDataSource();
14         QueryRunner qr=new QueryRunner(ds);
15         String  sql="select *  from system_user";
16         MapListHandler mp=new MapListHandler();
17         List<Map<String,Object>>  rest=qr.query(sql,mp);
18 
19         for(Map<String,Object> pbj:rest){
20             System.out.println(pbj.get("username"));
21         }
22     }
23 }