【jdbc访问数据库获取执行sql转换json】

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 import java.sql.*;
 import java.util.HashMap;
 import java.util.Map;

 /**
  * @version: java version 1.7+
  * @Author : simon
  * @Explain :
  * @contact:
  * @Time : 2018/8/15 14:44
  * @File : DBUtilForCarLoan
  * @Software: IntelliJ IDEA 2017.3.2
  */
 public class DBUtilForCarLoan {

     /**
      * 访问数据库筛选数据并以json格式返回
      *
      */

     public static final String DB_URL=""; // DB URL
     public static final String DB_DRIVER="com.mysql.jdbc.Driver";// DB driver
     public static final String USER_NAME=""; // DB user name
     public static final String USER_PASSWORD=""; // DB user password
     public static final String EXECUTE_SQL=""; //DB execute sql

     /**
      * add by simon
      *
      * 功能：发送数据库连接请求
      *
      * @param url 数据库地址
      * @param driver 数据库驱动
      * @param name  数据库名称
      * @param password  数据库密码
      * @return
      */
     public static Connection sendDBconnection( String url,String driver,String name,String password){

         Connection connection=null;
         try {
             Class.forName(driver);
             connection = DriverManager.getConnection(url,name,password);

         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         }catch (SQLException e) {

             System.out.println("数据库登录失败，数据库为：" + DB_URL + "，用户名为：" + USER_NAME + "，密码为：" + USER_PASSWORD);
             e.printStackTrace();
         }
         return connection;
     }

     /**
      * add simon
      *
      * 功能：连接数据库并执行SQL语句并返回执行结果
      *
      * @param sql
      * @return
      */
     public static ResultSet getSqlResult( String sql ){

         Connection con = sendDBconnection(DB_URL,DB_DRIVER,USER_NAME,USER_PASSWORD);
         Statement statement =null;
         ResultSet sqlresult=null;

         try {

             //Statement对象执行数据库操作语句
             statement = con.createStatement();
             //执行sql语句并将结果保存在sqlresult
             sqlresult = statement.executeQuery(sql);

         } catch (SQLException e) {
             e.printStackTrace();
         }

         return sqlresult;
     }

     /**
      * add by simon
      *
      * 功能：将ResultSet转换为 Map<String,String>
      * @param rs
      * @return Map<String,String>
      * @throws SQLException
      */
     public static Map<String,String> getResultMap (ResultSet rs) throws SQLException {

         Map<String, String> map = new HashMap<String, String>();
         ResultSetMetaData rsmd = rs.getMetaData();
         int count = rsmd.getColumnCount();

         for (int i = 1; i <= count; i++) {
             String key = rsmd.getColumnLabel(i);
             String value = rs.getString(i);
             map.put(key, value);
         }
         return map;
     }