tools.java

这是一个网上购物店的源码

package org.digitstore.util;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Vector;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 类功能 ：公共工具类 <br>
 */
public class Tools {
	private static Log logger = LogFactory.getLog(Tools.class);

	public static String encodeGB(String parameter) {
		try {
			if (parameter == null) {
				return parameter;
			} else {
				return new String(parameter.getBytes("ISO-8859-1"), "GBK");
			}
		} catch (Exception e) {
			return parameter;
		}
	}

	public static String encodeISO(String parameter) {
		try {
			if (parameter == null) {
				return parameter;
			} else {
				return new String(parameter.getBytes("GBK"), "ISO-8859-1");
			}
		} catch (Exception e) {
			return parameter;
		}
	}

	public static Vector str2Vector(String[] str) {
		Vector ret = new Vector();

		if (str == null) {
			return ret;
		}

		for (int i = 0; i < str.length; i++) {
			ret.add(str[i]);
		}

		return ret;
	}

	public static String[] vector2String(Vector v) {
		String[] r = new String[v.size()];

		for (int i = 0; i < v.size(); i++) {
			r[i] = (String) v.get(i);
		}

		return r;
	}

	public static boolean isDouble(Object teststr) {
		if (teststr == null) {
			return false;
		}

		try {
			Double.parseDouble(teststr.toString());

			return true;
		} catch (Exception e) {
			return false;
		}
	}

	public static boolean isInt(Object teststr) {
		if (teststr == null) {
			return false;
		}

		try {
			Long.parseLong(teststr.toString());

			return true;
		} catch (Exception e) {
			return false;
		}
	}

	public static String trimStr(String str) {
		if (str == null) {
			return "";
		}

		return str.trim();
	}

	/**
	 * 年月日数组合并为整个的数组
	 */
	public static String[] join(String[] year, String[] month, String[] day,
			char c) {
		for (int i = 0; i < year.length; i++) {
			year[i] += (c + month[i] + c + day[i]);
		}

		return year;
	}

	private static DateFormat formater = null;
	static {
		formater = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
	}

	/**
	 * 将Date类型转换成数据库日期类型格式的字符串
	 * 
	 * @param date
	 * @return
	 */
	public static String transDate2SQLString(Date date) {
		return formater.format(date);
	}

	/**
	 * 将数据库日期类型格式的字符串转换成Date类型
	 * 
	 * @param date
	 * @return
	 */
	public static Date transSQLString2Date(String str) {
		try {
			return formater.parse(str);
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

	/**
	 * 从ApplicationData表中获取某个表的将要插入的id值
	 * 
	 * @return
	 */
	synchronized public static int getNextID(String tableName) {
		int result = -1;
		DBCon con = new DBCon("study");
		String sql = "SELECT * FROM ApplicationData WHERE dataName='"
				+ tableName + "'";
		String sqlUpdate = null;
		DBSet rs = null;
		try {
			rs = con.executeQuery(sql);
			result = Integer.parseInt(rs.get(0, "numberValue"));
			sqlUpdate = "UPDATE ApplicationData SET numberValue="
					+ (result + 1) + " WHERE dataName='" + tableName + "'";
			con.executeUpdate(sqlUpdate);
			con.commit();
		} catch (Exception e) {
			con.rollback();
			result = -1;
			logger.debug("getNextID Error!" + e);
		} finally {
			con.close();
		}
		return result;
	}
}