java 读取mysql中数据 并取出

public static String url = null;
public static String username = null;
public static String password = null;
public static Connection conn;
public static Statement stmt;
public static ResultSet rs;
public static String fileName = null;
public static List lists = new ArrayList();

public static String PATH = "/dbconfig.properties";
private static Properties properties;
static {
try {
InputStream is = DBlUtils.class.getResourceAsStream(PATH);
properties = new Properties();
properties.load(is);
url = properties.getProperty("jdbc.url");
username = properties.getProperty("jdbc.username");
password = properties.getProperty("jdbc.password");
fileName = properties.getProperty("fileName");
System.out.println("fileName:" + fileName);
if (is != null)
is.close();
} catch (IOException e) {

e.printStackTrace();
}

}

public void closeConnection(Connection conn) {

if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

/**
* 查询mysql 数据库数据，并获得内容
*
* @param sql
*/
public static void queryDatas(String sql) {

try {
conn = DriverManager.getConnection(url, username, password);
conn.setAutoCommit(false);
stmt = conn.prepareStatement("load data local infile '' " + "into table loadtest fields terminated by ','");
StringBuilder sb = new StringBuilder();
InputStream is = new ByteArrayInputStream(sb.toString().getBytes());
((com.mysql.jdbc.Statement) stmt).setLocalInfileInputStream(is);
ResultSet rs = stmt.executeQuery(sql);
ResultSetMetaData rsmd = rs.getMetaData();
int columnCount = rsmd.getColumnCount();
// 输出列名
for (int i = 1; i <= columnCount; i++) {
System.out.print(rsmd.getColumnName(i));
System.out.print("(" + rsmd.getColumnTypeName(i) + ")");
System.out.print(" | ");
}
System.out.println();
// 输出数据
while (rs.next()) {
for (int i = 1; i <= columnCount; i++) {
System.out.print(rs.getString(i) + " | ");
}
System.out.println();
}

// conn.commit();
} catch (SQLException e) {
e.printStackTrace();
}

}

public static void main(String[] args) {

String sql = "select * from tablename";
queryDatas(sql);

}