Java之Util工具类

import java.io.*;
import java.lang.management.ManagementFactory;
import java.math.BigInteger;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.sql.*;
import java.text.NumberFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.Date;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.zip.GZIPInputStream;

public class Util {
	private static final Logger log = Logger.getLogger(Util.class.getSimpleName());
	private static final long FILE_COPY_BUFFER_SIZE = 1024 * 1024 * 3;
	private static final String WORDS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
	private static final SecureRandom RANDOM = new SecureRandom();
	private static final String UA_Iphone = "Mozilla/5.0 (iPhone; CPU iPhone OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A403 Safari/8536.25";
	private static final String UA_Firefox = "Firefox/18.0";
	private static final String UA_Chrome = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/51.0.2704.79 Chrome/51.0.2704.79 Safari/537.36";

	private static String P_Email = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";

	public static boolean isNull(String val) {
		return val == null || "".equals(val.trim());
	}

	/**
	 * @TODO 0?
	 * @param val
	 * @return
	 */
	public static Integer getInteger(String val) {
		return isNull(val) ? 0 : Integer.valueOf(val.trim());
	}

	public static Long getLong(String val) {
		return isNull(val) ? 0 : Long.valueOf(val.trim());
	}

	public static Integer getInt(String val) {
		return isNull(val) ? 0 : Integer.parseInt(val.trim());
	}

	public static Double getDouble(String val) {
		return isNull(val) ? 0.0d : Double.valueOf(val.trim());
	}

	public static java.sql.Date getSQLDate(String val) {
		return isNull(val) ? null : java.sql.Date.valueOf(val.trim());
	}

	// is Number
	public static boolean isNumber(String inputData) {
		NumberFormat formatter = NumberFormat.getInstance();
		ParsePosition pos = new ParsePosition(0);
		formatter.parse(inputData, pos);
		return inputData.length() == pos.getIndex();
	}

	public static boolean isInteger(String s) {
		Scanner sc = new Scanner(s);
		return sc.hasNextInt();
	}

	public static boolean isNumeric(String str) {
		if (str == null)
			return false;
		for (char c : str.toCharArray()) {
			if (!Character.isDigit(c))
				return false;
		}
		return true;
	}

	/**
	 * data time <br />
	 * yyyy-MM-dd HH:mm:ss <br />
	 */
	public static String now() {
		String fmt = "yyyy-MM-dd HH:mm:ss";
		SimpleDateFormat df = new SimpleDateFormat(fmt);
		return (df.format(new Date()));
	}

	/** yyyy-MM-dd HH:mm:ss */
	public static String getNowTime() {
		return getNowTime("yyyy-MM-dd HH:mm:ss");
	}

	/** yyyyMMddHHmmss */
	public static Long getNowTimeNumber() {
		return new Long(getNowTime("yyyyMMddHHmmss"));
	}

	/** yyyyMMddHHmmss */
	public static String getNowTimeLong() {
		return getNowTime("yyyyMMddHHmmss");
	}

	/** yyyyMMddHHmmss */
	public static String getNowTimeFile() {
		return getNowTime("yyyyMMddHHmmss");
	}

	public static String getNowTime(String fmt) {
		SimpleDateFormat sf = new SimpleDateFormat(fmt);
		String dt = sf.format(new Date());
		return dt;
	}

	/** yyyyMMddHHmmss */
	public static Long roll2Date(long epoch, long roll2) {
		return roll2Date(epoch, roll2, "yyyyMMddHHmmss");
	}

	public static Long roll2Date(long epoch, long roll2, String fmt) {
		SimpleDateFormat sf = new SimpleDateFormat(fmt);
		String dt = sf.format(new Date(epoch + roll2));
		return new Long(dt);
	}

	/** milliseconds "yyyyMMddHHmmss" */
	public static Long epoch2dateLong(long epoch) {
		return new Long(epoch2date(epoch, "yyyyMMddHHmmss"));
	}

	/** milliseconds "yyyy-MM-dd HH:mm:ss" */
	public static String epoch2date(long epoch) {
		return epoch2date(epoch, "yyyy-MM-dd HH:mm:ss");
	}

	/** yyyy-MM-dd HH:mm:ss */
	public static String epoch2date(long epoch, String fmt) {
		SimpleDateFormat sf = new SimpleDateFormat(fmt);
		String dt = sf.format(new Date(epoch));
		return dt;
	}

	public static long getEpoch() {
		return new Date().getTime() / 1000;
	}

	/** 20160719181054 -> 2016-07-19 18:10:54 */
	public static String showTime(long time) {
		String l = String.valueOf(time);
		return l.substring(0, 4) + "-" + l.substring(4, 6) + "-" + l.substring(6, 8) + " " //
				+ l.substring(8, 10) + ":" + l.substring(10, 12) + ":" + l.substring(12, 14);

	}

	public static String showTimeMinute(long time) {
		return showTime(time).substring(0, 16);
	}

	// ip country
	public static long ip2num(String start_ip) {
		String[] octets_start = start_ip.split("\\.");
		long _start = 0;
		for (String octet_s : octets_start) {
			int octet_i = Integer.parseInt(octet_s);
			_start <<= 8;
			_start |= octet_i;
		}
		return _start;
	}

	public static String num2ip(long ip_number) {
		String[] octets = new String[4];
		for (int i = 3; i >= 0; i--) {
			octets[i] = String.valueOf(ip_number & 0xFF);
			ip_number >>= 8;
		}
		return join(Arrays.asList(octets), ".");
	}

	// binary search
	public static int firstLeft(Long[] array, long k, int start, int end) {
		if (start > end) {
			return -1;
		}
		int c = 0;
		while (start < end) {
			int mid = start + (end - start) / 2;
			if (array[mid] == k) {
				return mid;
			} else if (array[mid] > k) {
				end = mid - 1;
			} else { // [mid] < k
				start = mid + 1;
			}
			// System.out.println("firstLeft(): " + c++ + " " + start);
		}
		if (array[start] > k) {
			return start - 1;
		} else {
			return start;
		}
	}

	/* string */
	public static boolean valid(String obj) {
		return obj != null && !"".equals(obj);
	}

	public static boolean validEmail(String e) {
		if (e == null)
			return false;
		Pattern regex = Pattern.compile(P_Email);
		Matcher matcher = regex.matcher(e);
		return matcher.matches();
	}

	public static String slurp(InputStream in) throws IOException {
		StringBuffer out = new StringBuffer();
		byte[] b = new byte[4096];
		for (int n; (n = in.read(b)) != -1;) {
			out.append(new String(b, 0, n));
		}
		return out.toString();
	}

	public static List<String> split(String line, int len) {
		List<String> l = new ArrayList<String>();
		for (int i = 0; i < line.length(); i += len) {
			l.add(line.substring(i, i + len));
		}
		// return l.toArray(new String[l.size()]);
		return l;
	}

	/** SPACE -> "" */
	public static String[] split(String line, String delimiter) {
		List<String> nodeValues = new ArrayList<String>();

		int offset = 0;
		int pos = line.indexOf(delimiter, offset);

		while (pos != -1) {
			nodeValues.add(offset == pos ? "" : line.substring(offset, pos));

			offset = pos + delimiter.length();
			pos = line.indexOf(delimiter, offset);
		}

		if (offset <= line.length()) {
			nodeValues.add(offset == line.length() ? "" : line.substring(offset));
		}
		return nodeValues.toArray(new String[nodeValues.size()]);
	}

	public static String join(Collection<?> ls, String delimiter) {
		String dl = delimiter == null ? "" : delimiter;
		StringBuilder builder = new StringBuilder();
		for (Object o : ls) {
			builder.append(o).append(dl);
		}
		return builder.substring(0, builder.length() - dl.length());
	}

	public static String join(Object[] ls, String delimiter) {
		String dl = delimiter == null ? "" : delimiter;
		StringBuilder builder = new StringBuilder();
		for (Object o : ls) {
			builder.append(o).append(dl);
		}
		return builder.substring(0, builder.length() - dl.length());
	}

	public static String join(long[] ls, String delimiter) {
		String dl = delimiter == null ? "" : delimiter;
		StringBuilder builder = new StringBuilder();
		for (long o : ls) {
			builder.append(o).append(dl);
		}
		return builder.substring(0, builder.length() - dl.length());
	}

	public static String resetParameter(String url, String param, String value) {
		String rrl = eraseParameter(url, param);
		if (rrl.indexOf('?') != -1) {
			return rrl += "&" + param + "=" + value;
		}
		return rrl += "?" + param + "=" + value;
	}

	public static String eraseParameter(String url, String param) {
		int si = url.indexOf(param + "=");
		if (si != -1) {
			int ei = url.indexOf('&', si);
			if (url.charAt(si - 1) == '&') { // no start
				si -= 1;
			} else if (url.charAt(si - 1) == '?') { // first
				ei += 1;
			}
			return url.substring(0, si) + (ei < 1 ? "" : url.substring(ei));
		}
		return url;
	}

	public static String getParameter(String url, String param) {
		int si = url.indexOf(param + "=");
		if (si != -1) {
			int ei = url.indexOf('&', si);
			if (ei == -1) { // end of url
				ei = url.length();
			}
			return url.substring(si + param.length() + 1, ei);
		}
		return "";
	}

	/** 100000 -> 123456 */
	public static int randomNumber(int base) {
		int r = RANDOM.nextInt(base * 10);
		return r < base ? base + r : r;
	}

	public static String random() {
		return random(32);
	}

	public static String random(int len) {
		StringBuilder sb = new StringBuilder(len);
		int size = WORDS.length();
		for (int i = 0; i < len; i++)
			sb.append(WORDS.charAt(RANDOM.nextInt(size)));
		return sb.toString();
	}

	public static String zeroPrefix(int val, int len) {
		return zeroPrefix(String.valueOf(val), len);
	}

	public static String zeroPrefix(String val, int len) {
		return ("00000000000000000000".substring(0, len) + val).substring(val.length());
	}

	// crc32
	public static long getCRC32(List<String> ls) {
		String[] a = new String[ls.size()];
		return getCRC32(ls.toArray(a));
	}

	public static long getCRC32(String str) {
		return str.hashCode();
	}

	public static long getCRC32(String[] strs) {
		long crc = 0;
		for (String str : strs) {
			if (str == null)
				continue;
			crc ^= str.hashCode();
		}
		return crc;
	}

	/* file and stream */
	public static String getMD5(byte[] bs) {
		try {
			MessageDigest digest = MessageDigest.getInstance("MD5");
			digest.update(bs);
			byte[] md5sum = digest.digest();
			String md5 = "";
			for (int i = md5sum.length - 1; i >= 0; i--) {
				String hex = Integer.toHexString(md5sum[i] & 0xFF);
				if (hex.length() == 1) {
					hex = '0' + hex;
				}
				md5 = hex + md5;
			}
			return md5;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	public static String getMD5(String s) {
		return s == null ? null : getMD5(s.getBytes());
	}

	public static String getMD5(File f) throws Exception {
		InputStream is = new FileInputStream(f);
		byte[] buffer = new byte[8192];
		int read = 0;
		MessageDigest digest = MessageDigest.getInstance("MD5");
		while ((read = is.read(buffer)) > 0) {
			digest.update(buffer, 0, read);
		}
		is.close();
		byte[] md5sum = digest.digest();

		String md5 = "";
		for (int i = md5sum.length - 1; i >= 0; i--) {
			String hex = Integer.toHexString(md5sum[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			md5 = hex + md5;
		}
		return md5;
	}

	public static byte[] hex2byte(String s) {
		int len = s.length();
		byte[] data = new byte[len / 2];
		for (int i = 0; i < len; i += 2) {
			data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
		}
		return data;
	}

	public static Map<String, String> readConfig(String conf) {
		Map<String, String> map = Collections.synchronizedMap(new HashMap<String, String>());

		try {
			// reload conf file
			Properties config = new Properties();
			InputStream ins = new Util().getClass().getResourceAsStream(conf);
			config.load(ins);

			for (Iterator it = config.keySet().iterator(); it.hasNext();) {
				String nam = (String) it.next();
				String val = new String(config.getProperty(nam).getBytes("ISO8859-1"), "UTF-8");
				map.put(nam, val.trim());
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		return map;
	}

	public static byte[] utf2gbk(byte[] bs) {
		return byteConvert(bs, "UTF-8", "GBK");
	}

	public static byte[] byte2UTF8(byte[] bs, String orgcs) {
		return byteConvert(bs, orgcs, "UTF-8");
	}

	public static byte[] byteConvert(byte[] bs, String orgcs, String dstcs) {
		try {
			Charset org = Charset.forName(orgcs);
			Charset dst = Charset.forName(dstcs);

			ByteBuffer inb = ByteBuffer.wrap(bs);
			CharBuffer data = org.decode(inb);

			ByteBuffer outputBuffer = dst.encode(data);
			byte[] oub = outputBuffer.array();
			return oub;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	public static void checkNnewDir(String fn) {
		try {
			File f = new File(fn);
			File d = f.getParentFile();
			if (!d.exists()) {
				d.mkdirs();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public static String getLine(String ctn, int seq) {
		int si = 0;
		int ni = -1;
		do {
			si = ni + 1;
			ni = ctn.indexOf('\n', Math.max(0, si));
			// System.out.println(seq + " " + si + " " + ni);
		} while (--seq > 0 && ni != -1);
		ni = ni == -1 && si < ctn.length() ? ctn.length() : ni;
		return ni != -1 ? ctn.substring(si, ni) : null;
	}

	public static String getNextLine(String ctn, int offset) {
		int ei = ctn.indexOf('\n', offset);
		return ei != -1 && ei > offset ? ctn.substring(offset, ei) : null;
	}

	public static byte[] streamReader(InputStream ins) throws IOException {
		return streamReader(ins, 0, -1);
	}

	public static byte[] streamReader(InputStream ins, long skip, long size) throws IOException {
		BufferedInputStream bis = new BufferedInputStream(ins);
		bis.skip(skip); // 0 or +

		boolean hasSize = size != -1; // -1 full
		long readed = 0;

		ByteArrayOutputStream ba = new ByteArrayOutputStream();
		long bsize = hasSize ? Math.min(1024, size) : 1024;
		byte[] b = new byte[(int) bsize];
		int len = 0;
		while ((len = bis.read(b)) != -1) {
			ba.write(b, 0, len);

			if (hasSize) {
				readed += len;
				if (size - readed < 1024) {
					b = new byte[(int) (size - readed)];
				}
				if (readed == size) {
					break;
				}
			}
		}
		return ba.toByteArray();
	}

	public static byte[] stream2array(InputStream ins) {
		return stream2array(ins, 20480);
	}

	public static byte[] stream2array(InputStream ins, int bsize) {
		ByteArrayOutputStream out = new ByteArrayOutputStream(bsize);
		try {
			byte[] buf = new byte[bsize];
			int len;
			while ((len = ins.read(buf)) > 0) {
				out.write(buf, 0, len);
			}
			ins.close();
			out.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return out.toByteArray();
	}

	// file to byte[]
	public static byte[] getBytesFromFile(File file) {
		try {
			InputStream is = new FileInputStream(file);

			// Get the size of the file
			long length = file.length();

			// You cannot create an array using a long type.
			// It needs to be an int type.
			// Before converting to an int type, check
			// to ensure that file is not larger than Integer.MAX_VALUE.
			if (length > Integer.MAX_VALUE) {
				// File is too large
			}

			// Create the byte array to hold the data
			byte[] bytes = new byte[(int) length];

			// Read in the bytes
			int offset = 0;
			int numRead = 0;
			while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
				offset += numRead;
			}

			// Ensure all the bytes have been read in
			if (offset < bytes.length) {
				throw new IOException("Could not completely read file " + file.getName());
			}

			// Close the input stream and return bytes
			is.close();
			return bytes;
		} catch (IOException ioe) {
			ioe.printStackTrace();
		}
		return null;
	}

	public static byte[] getBytesFromUrl(String url) throws IOException {
		return getBytesFromUrl(url, 0);
	}

	public static byte[] getBytesFromUrl(String url, int size) throws IOException {
		ByteArrayOutputStream out = new ByteArrayOutputStream(1024 * 20);
		BufferedInputStream in = new BufferedInputStream(new URL(url).openStream());

		byte[] b = new byte[1024];
		int sz = 0;
		int siz_ = 0;
		while ((sz = in.read(b)) != -1) {
			out.write(b, 0, sz);
			siz_ += sz;
			if (size > 0 && siz_ >= size) {
				break;
			}
		}
		in.close();
		return out.toByteArray();
	}

	public static byte[] getBytesOfUrl(String u) throws IOException {
		ByteArrayOutputStream out = new ByteArrayOutputStream(1024 * 20);
		URL url = new URL(u);
		HttpURLConnection con = (HttpURLConnection) url.openConnection();
		HttpURLConnection.setFollowRedirects(true);
		con.setConnectTimeout(1000 * 5);
		con.setRequestProperty("User-Agent", UA_Chrome);
		con.setRequestMethod("GET");

		// Map<String, List<String>> responseMap = con.getHeaderFields();
		// for (Iterator<String> iterator = responseMap.keySet().iterator(); iterator.hasNext();) {
		// String key = (String) iterator.next();
		// List<String> values = responseMap.get(key);
		// for (int i = 0; i < values.size(); i++) {
		// Object o = values.get(i);
		// System.out.println(key + ": " + o);
		// }
		// }

		InputStream is = con.getInputStream();
		BufferedInputStream bis = new BufferedInputStream(is);
		byte[] buf = new byte[1024];
		int len = -1;
		while ((len = bis.read(buf)) != -1) {
			out.write(buf, 0, len);
		}
		bis.close();
		return out.toByteArray();
	}

	public static byte[] deGZip(byte[] gz) throws IOException {
		return deGZip(gz, 1024 * 1024 * 1);
	}

	public static byte[] deGZip(byte[] gz, int bsize) throws IOException {
		GZIPInputStream gs = new GZIPInputStream(new ByteArrayInputStream(gz));
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		int len = 0;
		byte[] buf = new byte[bsize];
		while ((len = gs.read(buf)) != -1) {
			baos.write(buf, 0, len);
		}
		return baos.toByteArray();
	}

	/* exception */
	public static byte[] getExceptionTrace(Exception e) {
		ByteArrayOutputStream ba = new ByteArrayOutputStream();
		PrintStream w = new PrintStream(ba);
		e.printStackTrace(w);
		w.flush();
		return ba.toByteArray();
	}

	/* sql */
	public static String getCountSql(String sql) {
		StringBuilder sb = new StringBuilder();
		int fi = sql.indexOf(" from ");
		sb.append("select count(1)");
		sb.append(sql.substring(fi));
		return sb.toString();
	}

	public static String getPagingSqlMySQL(String sql, int start, int stop) {
		return sql + " limit " + (start >= 1 ? start - 1 : start) + ", " + (stop > start ? (stop - start) + 1 : 1);
	}

	public static String getPagingSql(String sql, int start, int stop) {
		StringBuilder sb = new StringBuilder();
		int wi = sql.lastIndexOf(" where ");
		boolean hw = (wi != -1 && sql.substring(wi).indexOf(')') == -1);
		String wr = hw ? " and" : " where";
		sb.append("select * from (select rownum as num, ");
		sb.append(sql.substring(7));
		sb.append(wr);
		sb.append(" rownum <= ");
		sb.append(stop);
		sb.append(") t where t.num >= ");
		sb.append(start);
		return sb.toString();
	}

	/** seq_acct_id -> ACCT */
	public static String getSequencePref(String seq) {
		int si = seq.indexOf('_') + 1;
		int ei = seq.indexOf('_', si);
		return seq.substring(si, ei).toUpperCase();
	}

	public static void closeConnection(Connection conn) {
		try {
			if (conn != null) {
				// log.info("auto commit(" + conn.getAutoCommit() + ")");
				if (!conn.getAutoCommit()) {
					conn.setAutoCommit(true);
				}
				conn.close();
			}
			conn = null;
		} catch (SQLException se) {
			se.printStackTrace();
		}
	}

	public static void rollbackConnection(Connection conn) {
		try {
			if (conn != null) {
				log.info("rollbackConnection(" + conn.getAutoCommit() + ")");
				conn.rollback();
			}
		} catch (SQLException se) {
			se.printStackTrace();
		}
	}

	public static void closeStatement(Statement stmt) {
		try {
			if (stmt != null) {
				stmt.close();
			}
		} catch (SQLException se) {
			se.printStackTrace();
		}
	}

	public static void closeResultSet(ResultSet rs) {
		try {
			if (rs != null) {
				rs.close();
			}
		} catch (SQLException se) {
			se.printStackTrace();
		}
	}

	public static void closeRS(ResultSet rs, Statement stmt) {
		closeResultSet(rs);
		closeStatement(stmt);
	}

	public static void closeRSC(ResultSet rs, Statement stmt, Connection conn) {
		closeResultSet(rs);
		closeStatement(stmt);
		closeConnection(conn);
	}

	public static void ShowResultSetMeta(ResultSetMetaData md) {
		try {
			int cc = md.getColumnCount();
			for (int i = 1; i <= cc; i++) {
				String name = md.getColumnName(i);
				String type = md.getColumnTypeName(i);
				log.info("ShowResultSetMeta(): " + name + ", " + type);
			}
		} catch (SQLException se) {
			se.printStackTrace();
		}
	}

	public static boolean validConnection(Connection conn) {
		boolean valid = false;
		try {
			valid = conn != null && !conn.isClosed() && conn.isValid(3);
		} catch (SQLException se) {
			valid = false;
		} finally {
			if (!valid) {
				closeConnection(conn);
			}
		}
		return valid;
	}

	public static void printSQLException(SQLException ex) {
		for (Throwable e : ex) {
			if (e instanceof SQLException) {
				e.printStackTrace(System.err);
				System.err.println("SQLState: " + ((SQLException) e).getSQLState());
				System.err.println("Error Code: " + ((SQLException) e).getErrorCode());
				System.err.println("Message: " + e.getMessage());
				Throwable t = ex.getCause();
				while (t != null) {
					System.out.println("Cause: " + t);
					t = t.getCause();
				}
			}
		}
	}

	/** http */
	public static String httpPost(String url, String data) {
		return httpPost(url, data, 0);
	}

	public static String httpPost(String url, String data, int timeout) {
		String charset = "UTF-8";
		OutputStream output = null;
		try {
			HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
			conn.setDoOutput(true); // Triggers POST.
			conn.setDoInput(true);
			conn.setRequestMethod("POST"); // POST method
			conn.setRequestProperty("Accept-Charset", charset);
			conn.setRequestProperty("Connection", "keep-alive");
			conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=" + charset);
			conn.setUseCaches(false);
			conn.setConnectTimeout(timeout == 0 ? 5000 : timeout);

			output = conn.getOutputStream();
			output.write(data.getBytes());

			int status = conn.getResponseCode();
			InputStream response = conn.getInputStream();
			String rs = new String(Util.streamReader(response));
			return rs != null ? rs.trim() : null;
		} catch (IOException ie) {
			ie.printStackTrace();
			return "-1";
		} finally {
			if (output != null)
				try {
					output.close();
				} catch (IOException logOrIgnore) {
				}
		}
	}

	/** security */
	public static final String encrypt(String data, BigInteger confuse) {
		if (data == null || data.length() == 0)
			return null;

		BigInteger bi_passwd = new BigInteger(data.getBytes());
		BigInteger bi_r1 = confuse.xor(bi_passwd);
		return bi_r1.toString(Character.MAX_RADIX);
	}

	public static final String decrypt(String encrypted, BigInteger confuse) {
		if (encrypted == null || encrypted.length() == 0)
			return null;

		try {
			BigInteger bi_r1 = new BigInteger(encrypted, Character.MAX_RADIX);
			BigInteger bi_r0 = bi_r1.xor(confuse);
			return new String(bi_r0.toByteArray());
		} catch (Exception e) {
			return null;
		}
	}

	public static final String rot13(String s) {
		StringBuilder b = new StringBuilder();
		for (int i = 0; i < s.length(); i++) {
			char c = s.charAt(i);
			if (c >= 'a' && c <= 'm')
				c += 13;
			else if (c >= 'A' && c <= 'M')
				c += 13;
			else if (c >= 'n' && c <= 'z')
				c -= 13;
			else if (c >= 'N' && c <= 'Z')
				c -= 13;
			b.append(c);
		}
		return b.toString();
	}

	public static int byte2int(byte[] b) {
		if (b.length == 4)
			return b[0] << 24 | (b[1] & 0xff) << 16 | (b[2] & 0xff) << 8 | (b[3] & 0xff);
		if (b.length == 3)
			return 0x00 << 24 | (b[0] & 0xff) << 16 | (b[1] & 0xff) << 8 | (b[2] & 0xff);
		else if (b.length == 2)
			return 0x00 << 24 | 0x00 << 16 | (b[0] & 0xff) << 8 | (b[1] & 0xff);
		else if (b.length == 2)
			return 0x00 << 24 | 0x00 << 16 | 0x00 << 8 | (b[0] & 0xff);
		return 0;
	}

	public static byte[] int2byte(int value) {
		byte[] array = new byte[4];
		int offset = 0;
		array[offset] = (byte) (0xff & (value >> 24));
		array[offset + 1] = (byte) (0xff & (value >> 16));
		array[offset + 2] = (byte) (0xff & (value >> 8));
		array[offset + 3] = (byte) (0xff & value);
		return array;
	}

	public static boolean fileTouch(String f) {
		File file = new File(f);
		try {
			file.createNewFile();
			if (file.exists()) {
				return file.setLastModified(System.currentTimeMillis());
			}
		} catch (IOException e) {
			e.printStackTrace();
			return false;
		}
		return false;
	}

	public static boolean fileDelete(String f) {
		File file = new File(f);
		try {
			return file.delete();
		} catch (Exception ignored) {
			return false;
		}
	}

	public static boolean fileCopy(String f_src, String f_dest) throws IOException {
		File srcFile = new File(f_src);
		File destFile = new File(f_dest);

		FileInputStream fis = null;
		FileOutputStream fos = null;
		FileChannel input = null;
		FileChannel output = null;
		try {
			fis = new FileInputStream(srcFile);
			fos = new FileOutputStream(destFile);
			input = fis.getChannel();
			output = fos.getChannel();
			long size = input.size();
			long pos = 0;
			long count = 0;
			while (pos < size) {
				count = size - pos > FILE_COPY_BUFFER_SIZE ? FILE_COPY_BUFFER_SIZE : size - pos;
				pos += output.transferFrom(input, pos, count);
			}
		} finally {
			output.close();
			fos.close();
			input.close();
			fis.close();
		}

		if (srcFile.length() != destFile.length()) {
			return false;
		}
		return true;
	}

	public static void fileSave(String f, byte[] ctn) {
		OutputStream out;
		try {
			out = new FileOutputStream(f);
			out.write(ctn);
			out.flush();
			out.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static String getJavaPID() {
		String pid = ManagementFactory.getRuntimeMXBean().getName();
		int ati = pid.indexOf('@');
		if (ati != -1)
			pid = pid.substring(0, ati);
		return pid;
	}

	public static long getIntegerOfArray(byte[] array, int offset) {
		return ((0xff & array[offset + 0]) << 0) | ((0xff & array[offset + 1]) << 8) | ((0xff & array[offset + 2]) << 16) | ((0xff & array[offset + 3]) << 24);
	}

	// Note: Value needs to be long to avoid sign extension
	public static void setIntegerToArray(byte[] array, int offset, long value) {
		array[offset + 0] = (byte) ((value >> 0) & 0xff);
		array[offset + 1] = (byte) ((value >> 8) & 0xff);
		array[offset + 2] = (byte) ((value >> 16) & 0xff);
		array[offset + 3] = (byte) ((value >> 24) & 0xff);
	}

	public static byte[] mergeArray(byte[] a1, byte[] a2) {
		byte[] a = new byte[a1.length + a2.length];
		System.arraycopy(a1, 0, a, 0, a1.length);
		System.arraycopy(a2, 0, a, a1.length, a2.length);
		return a;
	}

	public static int[] mergeArray(int[] a1, int[] a2) {
		int[] a = new int[a1.length + a2.length];
		System.arraycopy(a1, 0, a, 0, a1.length);
		System.arraycopy(a2, 0, a, a1.length, a2.length);
		return a;
	}

	/**
	 * String t = "asd asdf fa ab|\"ce asdf\"|eifw234 \"asdf adsf sadf\""; <br />
	 */
	public static String[] getTerms(String t) {
		if (t == null)
			return null;
		t = t.trim().replaceAll("\\s+", " ");

		List<String> ts = new ArrayList<String>();
		int t0 = 0;
		boolean g0 = false;
		boolean g1 = false;
		for (int i = 0; i < t.length(); i++) {
			if (t.charAt(i) == ' ' && (!g0 || (g0 && g1))) {
				ts.add(t.substring(t0, i).replaceAll("\"", ""));
				t0 = i + 1;
				if (g0 && g1) {
					g0 = false;
					g1 = false;
				}
			}
			if (t.charAt(i) == '"') {
				if (g0)
					g1 = true;
				else
					g0 = true;

				if (g0 && g1 && t.length() > i + 1 && t.charAt(i + 1) == '|') {
					g0 = false;
					g1 = false;
				}
			}
		}
		ts.add(t.substring(t0).replaceAll("\"", ""));
		String[] terms = new String[ts.size()];
		ts.toArray(terms);

		return terms;
	}
}

记录一个util工具类，类中有一些生成随机数，以及根据url获取请求的设备类型等方法。