util.java

这是我上次报java培训时

package jinLing.pub;

import java.util.*;

public class Util {
    public Util() {
    }

    /**
     * 功能：null转化为string
     */

    public static String getNulltoStr(Object o) {
        String str = "";
        if (o != null)
            str = (String) o;
        return str;
    }

    /**
     * 功能：判断是否不为空
     */

    public static boolean bIsEmpty(String str) {
        boolean bisNull = false;
        if (str == null || str == "" || str.trim().equals(""))
            bisNull = true;
        return bisNull;
    }

    /**
     * 功能：返回一个子符串
     */

    public static String Copy(String source, int beginIndex, int Count) {
        if (source.length() < Count)
            Count = source.length();
        if (beginIndex < 0)
            beginIndex = 0;
        return source.substring(beginIndex, Count);
    }

    /**
     * 功能：返回一个子符串
     */
    public static String Copy(Object source, int beginIndex, int Count) {
        String str = getNulltoStr(source);
        return Copy(str, beginIndex, Count);
    }
    /**
         * 功能：字符串转换成整型
         */
        public static long StrToLon(Object o) {
            String str = getNulltoStr(o);
            if (str == null || str == "" || str.trim().equals(""))
                str = "0";
            if(str.indexOf(".")!=-1)
                str = str.substring(0,str.indexOf(".")).trim();
            if (str == "" || str.trim().equals(""))
                str = "0";
            return Integer.parseInt(str.trim());
    }
    /**
     * 功能：字符串转换成整型,并去掉小数点后的位数
     */
    public static int StrToInt(String str) {
        if (str == null || str == "" || str.trim().equals(""))
            str = "0";
        if(str.indexOf(".")!=-1)
            str = str.substring(0,str.indexOf(".")).trim();
        if (str == "" || str.trim().equals(""))
            str = "0";
        return Integer.parseInt(str.trim());
    }
    /**
 * 功能：去掉小数后面多余的0
 */
public static String trimFloat(String str) {
    if (str == null || str == "" || str.trim().equals(""))
        str = "0";
    if(str.endsWith("0"))
        str = str.substring(0,str.length()-1);
    if(str.endsWith("0"))
        str = str.substring(0,str.length()-1);
    if(str.endsWith("."))
        str = str.substring(0,str.length()-1);
    if (str == "" || str.trim().equals(""))
        str = "0";
    return str;
}


    /**
     * 功能：Object 转换成整型
     */
    public static int StrToInt(Object o) {
        String str = getNulltoStr(o);
        return StrToInt(str);
    }
    /**
     * 功能：Object 转换成浮点型
     */
    public static double StrToFlo(Object o) {
        String str = getNulltoStr(o);
        if (str == null || str == "" || str.trim().equals(""))
            str = "0";
         double flo = Float.parseFloat(str);
         //String.valueOf(flo);

        return flo;
    }

    /**
     * 功能：打印调试信息
     */

    public static void debug(Object obj) {
        //write(String.valueOf(obj));
       System.out.println(obj);
    }
    /**
    * 功能：转换成中文字符
    */

    public static String toGb(String uniStr) {
    String gbStr = "";
    if (uniStr == null) {
      uniStr = "";
    }
    try {
      byte[] tempByte = uniStr.getBytes("ISO8859_1");
      gbStr = new String(tempByte, "GBK");
    }
    catch (Exception ex) {
      System.out.print(ex);
    }
    return gbStr;
}

public static String toUni(String gbStr){
  String uniStr = "";
  if(gbStr == null){
gbStr = "";
  }
  try{
byte[] tempByte = gbStr.getBytes("GBK");
uniStr = new String(tempByte,"ISO8859_1");
  }catch(Exception ex){
      System.out.print(ex);
 }
 return uniStr;
}
}