如何在JDBC程序中将时间戳对象转换为Date？
getTime()Timestamp类的方法从当前时间戳开始计时，该时间以格林尼治标准时间1970年1月00：00：00.000的毫秒为单位（长）。
Timestamp timestamp = rs.getTimestamp("DispatTimestamp");
long time = timestamp.getTime();java.sql.Date类的构造函数接受一个长变量，该变量表示从纪元时间起的毫秒数，并构造date对象。
//打印发货日期
System.out.println("Date of dispatch: "+new Date(time));使用这些，可以在JDBC中将TimeStamp对象转换为Date对象。
假设我们已经建立了与MySQL数据库的连接，并使用如下语句对象创建了一个名为dispatch_data的表：
//创建一个Statement对象
Statement stmt = con.createStatement();
//查询创建表
String create_query = "Create table disptach_data ("
+ "Product_Name VARCHAR(255), "
+ "Name_Of_Customer VARCHAR(255) , "
+ "Dispatch_Timestamp timestamp, "
+ "Location VARCHAR(255) )";
stmt.execute(create_query);我们使用PreparedStatement将表填充为：
String query = "INSERT INTO dispatch_data VALUES (?, ?, ?, ?)";
PreparedStatement pstmt = con.prepareStatement(query);
pstmt.setString(1, "KeyBoard");
pstmt.setString(2, "Amith");
pstmt.setTimestamp(3, new Timestamp(1567296000000L));
pstmt.setString(4, "Hyderabad");
pstmt.execute();
pstmt.setString(1, "Earphones");
pstmt.setString(2, "Sumith");
pstmt.setTimestamp(3, new Timestamp(1556668800000L));
pstmt.setString(4, "Vishakhapatnam");
pstmt.execute();
pstmt.setString(1, "Mouse");
pstmt.setString(2, "Sudha");
pstmt.setTimestamp(3, new Timestamp(1551398399000L));
pstmt.setString(4, "Vijayawada");
pstmt.execute();
System.out.println("Records inserted......");以下JDBC程序从ResultSet中检索时间戳记值，将其转换为Date和Time对象并打印详细信息。
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.Time;
import java.sql.Timestamp;
public class TimeStampToDate {
public static void main(String args[])throws Exception {
//注册驱动程序
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//获得连接
String mysqlUrl = "jdbc:mysql://localhost/mydatabase";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//创建一个Statement对象
Statement stmt = con.createStatement();
//创建Statement对象
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from dispatch_data");
//检索值
while(rs.next()) {
System.out.println("Product Name: "+rs.getString("Product_Name"));
System.out.println("Name Of The Customer: "+rs.getString("Name_Of_Customer"));
//检索时间戳
Timestamp timestamp = rs.getTimestamp("Dispatch_Timestamp");
//打印发货日期
System.out.println("Date of dispatch: "+new Date(timestamp.getTime()));
//打印发货时间
System.out.println("Time Of Dispatch: "+new Time(timestamp.getTime()));
System.out.println();
}
}
}输出结果
Connection established...... Product Name: KeyBoard Name Of The Customer: Amith Date of dispatch: 2019-09-01 Time Of Dispatch: 05:30:00 Product Name: Ear phones Name Of The Customer: Sumith Date of dispatch: 2019-05-01 Time Of Dispatch: 05:30:00 Product Name: Mouse Name Of The Customer: Sudha Date of dispatch: 2019-03-01 Time Of Dispatch: 05:29:59