获取访问者ip
/**
* 获取访问者ip
*/
public static String getUserIp(HttpServletRequest request) {
String ip = request.getHeader( "x-forwarded-for");
if ((ip == null) || (ip.length() == 0)
|| "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader( "Proxy-Client-IP");
}
if ((ip == null) || (ip.length() == 0)
|| "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader( "WL-Proxy-Client-IP");
}
if ((ip == null) || (ip.length() == 0)
|| "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
return ip;
}
获取用户浏览器类型
/**
* 获取用户浏览器类型
*/
public static String getUserBrowerType(HttpServletRequest request) {
// String userAgent = request.getHeader("USER-AGENT").toLowerCase();
// return userAgent.split(";")[1];
return request.getHeader( "USER-AGENT");
}
获取时间差
/**
* 获取相差n月的月份的第一天或最后一天，格式：yyyyMMdd
*
* @param diff
* 月份差值
* @param type
* ('first':该月第一天,"last":该月最后一天)
* @return yyyyMMdd
*/
public static String getDayByDiff( int diff, String type) {
Calendar c = Calendar. getInstance();
c.add(Calendar. MONTH, diff);
Calendar calendar = new GregorianCalendar(c.get(Calendar. YEAR), c
.get(Calendar. MONTH), c.get(Calendar.DAY_OF_MONTH ));
String day = "";
if ( "first".equals(type)) {
day = "0"
+ String.valueOf(calendar
.getActualMinimum(Calendar. DAY_OF_MONTH));
} else {
day = String. valueOf(calendar
.getActualMaximum(Calendar. DAY_OF_MONTH));
}
return new SimpleDateFormat( "yyyy-MM").format(calendar.getTime()) + "-"
+ day;
}
/**
* 获取 -n或+n个年的年份yyyy
*
* @param diff
* @return
*/
public static String getYearByDiff( int diff) {
Calendar c = Calendar. getInstance();
c.add(Calendar. YEAR, diff);
return new SimpleDateFormat( "yyyy").format(c.getTime());
}
/**
* 获取 -n或+n个月的日期，格式：yyyy -MM
*
* @param diff
* 月份差值
* @return yyyy- MM
*/
public static String getMonthByDiff( int diff) {
Calendar calendar = Calendar. getInstance();
calendar.add(Calendar. MONTH, diff);
return new SimpleDateFormat( "yyyy-MM").format(calendar.getTime());
}
获取前两个月的时间
/**
* 获取前两个月的时间
*
* @param upMonthTime
* (格式：2011 -09)
* @return
*/
public static String getUpThreeTime(String upMonthTime) {
int queryYear = Integer. parseInt(upMonthTime.substring(0, 4));
int queryMonth = Integer. parseInt(upMonthTime.substring(5, 7));
String upQueryDateString = null;
if ( "01".equals(upMonthTime.substring(5, 7))) {
queryYear = queryYear - 1;
queryMonth = 11;
upQueryDateString = Integer. toString(queryYear) + "-"
+ Integer.toString(queryMonth);
} else if ( "02".equals(upMonthTime.subSequence(5, 7))) {
queryYear = queryYear - 1;
queryMonth = 12;
upQueryDateString = Integer. toString(queryYear) + "-"
+ Integer.toString(queryMonth);
} else if (queryMonth > 2 && queryMonth < 12) {
queryMonth = queryMonth - 2;
upQueryDateString = Integer. toString(queryYear) + "-0"
+ Integer.toString(queryMonth);
} else {
queryMonth = queryMonth - 2;
upQueryDateString = Integer. toString(queryYear) + "-"
+ Integer.toString(queryMonth);
}
return upQueryDateString;
}
截取、合并数组
/**
* 截取子数组
*
* @param array
* @param startIndexInclusive
* @param endIndexExclusive
* @return
*/
public static byte[] subarray( byte[] array, int startIndexInclusive,
int endIndexExclusive) {
if (array == null) {
return null;
}
if (startIndexInclusive < 0) {
startIndexInclusive = 0;
}
if (endIndexExclusive > array. length) {
endIndexExclusive = array. length;
}
int newSize = endIndexExclusive - startIndexInclusive;
if (newSize <= 0) {
return new byte[0];
}
byte[] subarray = new byte[newSize];
System. arraycopy(array, startIndexInclusive, subarray, 0, newSize);
return subarray;
}
/**
* 合并byte数组
*
* @param array1
* @param array2
* @return
*/
public static byte[] addAll( byte[] array1, byte... array2) {
if (array1 == null) {
return null;
} else if (array2 == null) {
return null;
}
byte[] joinedArray = new byte[array1. length + array2. length];
System. arraycopy(array1, 0, joinedArray, 0, array1. length);
System. arraycopy(array2, 0, joinedArray, array1.length, array2.length);
return joinedArray;
}
时间格式
/**
* 根据指定的日期格式生成日期时间串
*
* @param format
* 日期格式,如yyyyMMdd
* @return dateTimeString
*/
public static String formatDatetime(Date date, String format) {
DateFormat df = new SimpleDateFormat(format);
return df.format(date);
}
/**
* 将给定的日期格式化为"yyyy -MM -dd HH:mm:ss"
*
* @param date
* 日期
* @return 格式为"yyyy- MM- dd HH:mm:ss"的String类型的时间串
*/
public static String formatDatetime(Date date) {
return formatDatetime(date, "yyyy-MM-dd HH:mm:ss");
}
/**
* 根据指定的格式返回当前日期时间
*
* @param format
* 指定的日期格式
* @return String类型的时间
*/
public static String formatDatetime(String format) {
return formatDatetime(new Date(), format);
}
/**
* 返回当前标准的日期时间
*
* @return 格式为"yyyy- MM- dd HH:mm:ss"的当前时间
*/
public static String formatDatetime() {
return formatDatetime(new Date(), "yyyy-MM-dd HH:mm:ss");
}
转码
/**
* 编码转换ISO8859 -1 -> UTF -8
*
* @param source
* @return
* @throws UnsupportedEncodingException
*/
public static String isoToUtf8(String source)
throws UnsupportedEncodingException {
return null == source ? "" : new String(source.getBytes( "ISO8859-1"),
"utf-8");
}
/**
* 编码转换GB2312 -> ISO8859 -1
*
* @param source
* @return
* @throws UnsupportedEncodingException
*/
public static String gb2312ToISO(String source)
throws UnsupportedEncodingException {
return null == source ? "" : new String(source.getBytes( "gb2312"),
"ISO8859-1");
}
/**
* 编码转换ISO8859 -1 -> GB2312
*
* @param source
* @return
* @throws UnsupportedEncodingException
*/
public static String isoToGb2312(String source)
throws UnsupportedEncodingException {
return null == source ? "" : new String(source.getBytes( "ISO8859-1"),
"gb2312");
}