Java经典代码

package com.common.file;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.text.DateFormat;import java.util.Date;import java.util.Iterator;import javax.swing.text.html.HTMLDocument.HTMLReader.FormAction;/** *  * 功能描述： *  * @author Administrator * @Date Jul 19, 2008 * @Time 9:46:11 AM * @version 1.0 */public class FileUtil {/** * 功能描述：列出某文件夹及其子文件夹下面的文件，并可根据扩展名过滤 *  * @param path *            文件夹 */public static void list(File path) {if (!path.exists()) {System.out.println("文件名称不存在!");} else {if (path.isFile()) {if (path.getName().toLowerCase().endsWith(".pdf")|| path.getName().toLowerCase().endsWith(".doc")|| path.getName().toLowerCase().endsWith(".chm")|| path.getName().toLowerCase().endsWith(".html")|| path.getName().toLowerCase().endsWith(".htm")) {// 文件格式System.out.println(path);System.out.println(path.getName());}} else {File[] files = path.listFiles();for (int i = 0; i < files.length; i++) {list(files[i]);}}}}/** * 功能描述：拷贝一个目录或者文件到指定路径下，即把源文件拷贝到目标文件路径下 *  * @param source *            源文件 * @param target *            目标文件路径 * @return void */public static void copy(File source, File target) {File tarpath = new File(target, source.getName());if (source.isDirectory()) {tarpath.mkdir();File[] dir = source.listFiles();for (int i = 0; i < dir.length; i++) {copy(dir[i], tarpath);}} else {try {InputStream is = new FileInputStream(source); // 用于读取文件的原始字节流OutputStream os = new FileOutputStream(tarpath); // 用于写入文件的原始字节的流byte[] buf = new byte[1024];// 存储读取数据的缓冲区大小int len = 0;while ((len = is.read(buf)) != -1) {os.write(buf, 0, len);}is.close();os.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubFile file = new File("F:\\Tomcat");list(file);Date myDate = new Date(); DateFormat df = DateFormat.getDateInstance();System.out.println(df.format(myDate)); }}

package com.common.string;import java.util.ArrayList;import java.util.LinkedHashSet;import java.util.Set;import java.util.regex.Matcher;import java.util.regex.Pattern;/** * 功能描述：关于字符串的一些实用操作 *  * @author Administrator * @Date Jul 18, 2008 * @Time 2:19:47 PM * @version 1.0 */public class StringUtil {/** * 功能描述：分割字符串 *  * @param str *            String 原始字符串 * @param splitsign *            String 分隔符 * @return String[] 分割后的字符串数组 */@SuppressWarnings("unchecked")public static String[] split(String str, String splitsign) {int index;if (str == null || splitsign == null) {return null;}ArrayList al = new ArrayList();while ((index = str.indexOf(splitsign)) != -1) {al.add(str.substring(0, index));str = str.substring(index + splitsign.length());}al.add(str);return (String[]) al.toArray(new String[0]);}/** * 功能描述：替换字符串 *  * @param from *            String 原始字符串 * @param to *            String 目标字符串 * @param source *            String 母字符串 * @return String 替换后的字符串 */public static String replace(String from, String to, String source) {if (source == null || from == null || to == null)return null;StringBuffer str = new StringBuffer("");int index = -1;while ((index = source.indexOf(from)) != -1) {str.append(source.substring(0, index) + to);source = source.substring(index + from.length());index = source.indexOf(from);}str.append(source);return str.toString();}/** * 替换字符串，能能够在HTML页面上直接显示(替换双引号和小于号) *  * @param str *            String 原始字符串 * @return String 替换后的字符串 */public static String htmlencode(String str) {if (str == null) {return null;}return replace("\"", """, replace("<", "<", str));}/** * 替换字符串，将被编码的转换成原始码（替换成双引号和小于号） *  * @param str *            String * @return String */public static String htmldecode(String str) {if (str == null) {return null;}return replace(""", "\"", replace("<", "<", str));}private static final String _BR = "<br/>";/** * 功能描述：在页面上直接显示文本内容，替换小于号，空格，回车，TAB *  * @param str *            String 原始字符串 * @return String 替换后的字符串 */public static String htmlshow(String str) {if (str == null) {return null;}str = replace("<", "<", str);str = replace(" ", " ", str);str = replace("\r\n", _BR, str);str = replace("\n", _BR, str);str = replace("\t", "    ", str);return str;}/** * 功能描述：返回指定字节长度的字符串 *  * @param str *            String 字符串 * @param length *            int 指定长度 * @return String 返回的字符串 */public static String toLength(String str, int length) {if (str == null) {return null;}if (length <= 0) {return "";}try {if (str.getBytes("GBK").length <= length) {return str;}} catch (Exception e) {}StringBuffer buff = new StringBuffer();int index = 0;char c;length -= 3;while (length > 0) {c = str.charAt(index);if (c < 128) {length--;} else {length--;length--;}buff.append(c);index++;}buff.append("...");return buff.toString();}/** * 功能描述：判断是否为整数 *  * @param str *            传入的字符串 * @return 是整数返回true,否则返回false */public static boolean isInteger(String str) {Pattern pattern = Pattern.compile("^[-\\+]?[\\d]+$");return pattern.matcher(str).matches();}/** * 判断是否为浮点数，包括double和float *  * @param str *            传入的字符串 * @return 是浮点数返回true,否则返回false */public static boolean isDouble(String str) {Pattern pattern = Pattern.compile("^[-\\+]?\\d+\\.\\d+$");return pattern.matcher(str).matches();}/** * 判断是不是合法字符 c 要判断的字符 */public static boolean isLetter(String str) {if (str == null || str.length() < 0) {return false;}Pattern pattern = Pattern.compile("[\\w\\.-_]*");return pattern.matcher(str).matches();}/** * 从指定的字符串中提取Email content 指定的字符串 *  * @param content * @return */public static String parse(String content) {String email = null;if (content == null || content.length() < 1) {return email;}// 找出含有@int beginPos;int i;String token = "@";String preHalf = "";String sufHalf = "";beginPos = content.indexOf(token);if (beginPos > -1) {// 前项扫描String s = null;i = beginPos;while (i > 0) {s = content.substring(i - 1, i);if (isLetter(s))preHalf = s + preHalf;elsebreak;i--;}// 后项扫描i = beginPos + 1;while (i < content.length()) {s = content.substring(i, i + 1);if (isLetter(s))sufHalf = sufHalf + s;elsebreak;i++;}// 判断合法性email = preHalf + "@" + sufHalf;if (isEmail(email)) {return email;}}return null;}/** * 功能描述：判断输入的字符串是否符合Email样式. *  * @param str *            传入的字符串 * @return 是Email样式返回true,否则返回false */public static boolean isEmail(String email) {if (email == null || email.length() < 1 || email.length() > 256) {return false;}Pattern pattern = Pattern.compile("^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$");return pattern.matcher(email).matches();}/** * 功能描述：判断输入的字符串是否为纯汉字 *  * @param str *            传入的字符窜 * @return 如果是纯汉字返回true,否则返回false */public static boolean isChinese(String str) {Pattern pattern = Pattern.compile("[\u0391-\uFFE5]+$");return pattern.matcher(str).matches();}/** * 功能描述：是否为空白,包括null和"" *  * @param str * @return */public static boolean isBlank(String str) {return str == null || str.trim().length() == 0;}/** * 功能描述：判断是否为质数 *  * @param x * @return */public static boolean isPrime(int x) {if (x <= 7) {if (x == 2 || x == 3 || x == 5 || x == 7)return true;}int c = 7;if (x % 2 == 0)return false;if (x % 3 == 0)return false;if (x % 5 == 0)return false;int end = (int) Math.sqrt(x);while (c <= end) {if (x % c == 0) {return false;}c += 4;if (x % c == 0) {return false;}c += 2;if (x % c == 0) {return false;}c += 4;if (x % c == 0) {return false;}c += 2;if (x % c == 0) {return false;}c += 4;if (x % c == 0) {return false;}c += 6;if (x % c == 0) {return false;}c += 2;if (x % c == 0) {return false;}c += 6;}return true;}/** * 功能描述：人民币转成大写 *  * @param str *            数字字符串 * @return String 人民币转换成大写后的字符串 */public static String hangeToBig(String str) {double value;try {value = Double.parseDouble(str.trim());} catch (Exception e) {return null;}char[] hunit = { '拾', '佰', '仟' }; // 段内位置表示char[] vunit = { '万', '亿' }; // 段名表示char[] digit = { '零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖' }; // 数字表示long midVal = (long) (value * 100); // 转化成整形String valStr = String.valueOf(midVal); // 转化成字符串String head = valStr.substring(0, valStr.length() - 2); // 取整数部分String rail = valStr.substring(valStr.length() - 2); // 取小数部分String prefix = ""; // 整数部分转化的结果String suffix = ""; // 小数部分转化的结果// 处理小数点后面的数if (rail.equals("00")) { // 如果小数部分为0suffix = "整";} else {suffix = digit[rail.charAt(0) - '0'] + "角"+ digit[rail.charAt(1) - '0'] + "分"; // 否则把角分转化出来}// 处理小数点前面的数char[] chDig = head.toCharArray(); // 把整数部分转化成字符数组char zero = '0'; // 标志'0'表示出现过0byte zeroSerNum = 0; // 连续出现0的次数for (int i = 0; i < chDig.length; i++) { // 循环处理每个数字int idx = (chDig.length - i - 1) % 4; // 取段内位置int vidx = (chDig.length - i - 1) / 4; // 取段位置if (chDig[i] == '0') { // 如果当前字符是0zeroSerNum++; // 连续0次数递增if (zero == '0') { // 标志zero = digit[0];} else if (idx == 0 && vidx > 0 && zeroSerNum < 4) {prefix += vunit[vidx - 1];zero = '0';}continue;}zeroSerNum = 0; // 连续0次数清零if (zero != '0') { // 如果标志不为0,则加上,例如万,亿什么的prefix += zero;zero = '0';}prefix += digit[chDig[i] - '0']; // 转化该数字表示if (idx > 0)prefix += hunit[idx - 1];if (idx == 0 && vidx > 0) {prefix += vunit[vidx - 1]; // 段结束位置应该加上段名如万,亿}}if (prefix.length() > 0)prefix += '圆'; // 如果整数部分存在,则有圆的字样return prefix + suffix; // 返回正确表示}/** * 功能描述：去掉字符串中重复的子字符串 *  * @param str *            原字符串，如果有子字符串则用空格隔开以表示子字符串 * @return String 返回去掉重复子字符串后的字符串 */@SuppressWarnings("unused")private static String removeSameString(String str) {Set<String> mLinkedSet = new LinkedHashSet<String>();// set集合的特征：其子集不可以重复String[] strArray = str.split(" ");// 根据空格(正则表达式)分割字符串StringBuffer sb = new StringBuffer();for (int i = 0; i < strArray.length; i++) {if (!mLinkedSet.contains(strArray[i])) {mLinkedSet.add(strArray[i]);sb.append(strArray[i] + " ");}}System.out.println(mLinkedSet);return sb.toString();}/** * 功能描述：过滤特殊字符 *  * @param src * @return */public static String encoding(String src) {if (src == null)return "";StringBuilder result = new StringBuilder();if (src != null) {src = src.trim();for (int pos = 0; pos < src.length(); pos++) {switch (src.charAt(pos)) {case '\"':result.append(""");break;case '<':result.append("<");break;case '>':result.append(">");break;case '\'':result.append("'");break;case '&':result.append("&");break;case '%':result.append("&pc;");break;case '_':result.append("&ul;");break;case '#':result.append("&shap;");break;case '?':result.append("&ques;");break;default:result.append(src.charAt(pos));break;}}}return result.toString();}/** * 功能描述：判断是不是合法的手机号码 *  * @param handset * @return boolean */public static boolean isHandset(String handset) {try {String regex = "^1[\\d]{10}$";Pattern pattern = Pattern.compile(regex);Matcher matcher = pattern.matcher(handset);return matcher.matches();} catch (RuntimeException e) {return false;}}/** * 功能描述：反过滤特殊字符 *  * @param src * @return */public static String decoding(String src) {if (src == null)return "";String result = src;result = result.replace(""", "\"").replace("'", "\'");result = result.replace("<", "<").replace(">", ">");result = result.replace("&", "&");result = result.replace("&pc;", "%").replace("&ul", "_");result = result.replace("&shap;", "#").replace("&ques", "?");return result;}/** * @param args */public static void main(String[] args) { String source = "abcdefgabcdefgabcdefgabcdefgabcdefgabcdefg"; String from = "efg"; String to = "房贺威"; System.out.println("在字符串source中，用to替换from，替换结果为：" + replace(from, to, source)); System.out.println("返回指定字节长度的字符串：" + toLength("abcdefgabcdefgabcdefgabcdefgabcdefgabcdefg", 9)); System.out.println("判断是否为整数：" + isInteger("+0")); System.out.println("判断是否为浮点数，包括double和float：" + isDouble("+0.36")); System.out.println("判断输入的字符串是否符合Email样式：" + isEmail("[e-mail]")); System.out.println("判断输入的字符串是否为纯汉字：" + isChinese("你好！")); System.out.println("判断输入的数据是否是质数：" + isPrime(12)); System.out.println("人民币转换成大写：" + hangeToBig("10019658")); System.out.println("去掉字符串中重复的子字符串：" + removeSameString("100 100 9658")); System.out.println("过滤特殊字符：" + encoding("100\"s<>fdsd100 9658")); System.out.println("判断是不是合法的手机号码：" + isHandset("15981807340")); System.out.println("从字符串中取值Email：" + parse("159818 [e-mail]07340"));}}

package com.common.time;import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;/** *  * 功能描述： *  * @author Administrator * @Date Jul 19, 2008 * @Time 9:47:53 AM * @version 1.0 */public class DateUtil {public static Date date = null;public static DateFormat dateFormat = null;public static Calendar calendar = null;/** * 功能描述：格式化日期 *  * @param dateStr *            String 字符型日期 * @param format *            String 格式 * @return Date 日期 */public static Date parseDate(String dateStr, String format) {try {dateFormat = new SimpleDateFormat(format);String dt = dateStr.replaceAll("-", "/");if ((!dt.equals("")) && (dt.length() < format.length())) {dt += format.substring(dt.length()).replaceAll("[YyMmDdHhSs]","0");}date = (Date) dateFormat.parse(dt);} catch (Exception e) {}return date;}/** * 功能描述：格式化日期 *  * @param dateStr *            String 字符型日期：YYYY-MM-DD 格式 * @return Date */public static Date parseDate(String dateStr) {return parseDate(dateStr, "yyyy/MM/dd");}/** * 功能描述：格式化输出日期 *  * @param date *            Date 日期 * @param format *            String 格式 * @return 返回字符型日期 */public static String format(Date date, String format) {String result = "";try {if (date != null) {dateFormat = new SimpleDateFormat(format);result = dateFormat.format(date);}} catch (Exception e) {}return result;}/** * 功能描述： *  * @param date *            Date 日期 * @return */public static String format(Date date) {return format(date, "yyyy/MM/dd");}/** * 功能描述：返回年份 *  * @param date *            Date 日期 * @return 返回年份 */public static int getYear(Date date) {calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.YEAR);}/** * 功能描述：返回月份 *  * @param date *            Date 日期 * @return 返回月份 */public static int getMonth(Date date) {calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.MONTH) + 1;}/** * 功能描述：返回日份 *  * @param date *            Date 日期 * @return 返回日份 */public static int getDay(Date date) {calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.DAY_OF_MONTH);}/** * 功能描述：返回小时 *  * @param date *            日期 * @return 返回小时 */public static int getHour(Date date) {calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.HOUR_OF_DAY);}/** * 功能描述：返回分钟 *  * @param date *            日期 * @return 返回分钟 */public static int getMinute(Date date) {calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.MINUTE);}/** * 返回秒钟 *  * @param date *            Date 日期 * @return 返回秒钟 */public static int getSecond(Date date) {calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.SECOND);}/** * 功能描述：返回毫秒 *  * @param date *            日期 * @return 返回毫秒 */public static long getMillis(Date date) {calendar = Calendar.getInstance();calendar.setTime(date);return calendar.getTimeInMillis();}/** * 功能描述：返回字符型日期 *  * @param date *            日期 * @return 返回字符型日期 yyyy/MM/dd 格式 */public static String getDate(Date date) {return format(date, "yyyy/MM/dd");}/** * 功能描述：返回字符型时间 *  * @param date *            Date 日期 * @return 返回字符型时间 HH:mm:ss 格式 */public static String getTime(Date date) {return format(date, "HH:mm:ss");}/** * 功能描述：返回字符型日期时间 *  * @param date *            Date 日期 * @return 返回字符型日期时间 yyyy/MM/dd HH:mm:ss 格式 */public static String getDateTime(Date date) {return format(date, "yyyy/MM/dd HH:mm:ss");}/** * 功能描述：日期相加 *  * @param date *            Date 日期 * @param day *            int 天数 * @return 返回相加后的日期 */public static Date addDate(Date date, int day) {calendar = Calendar.getInstance();long millis = getMillis(date) + ((long) day) * 24 * 3600 * 1000;calendar.setTimeInMillis(millis);return calendar.getTime();}/** * 功能描述：日期相减 *  * @param date *            Date 日期 * @param date1 *            Date 日期 * @return 返回相减后的日期 */public static int diffDate(Date date, Date date1) {return (int) ((getMillis(date) - getMillis(date1)) / (24 * 3600 * 1000));}/** * 功能描述：取得指定月份的第一天 *  * @param strdate *            String 字符型日期 * @return String yyyy-MM-dd 格式 */public static String getMonthBegin(String strdate) {date = parseDate(strdate);return format(date, "yyyy-MM") + "-01";}/** * 功能描述：取得指定月份的最后一天 *  * @param strdate *            String 字符型日期 * @return String 日期字符串 yyyy-MM-dd格式 */public static String getMonthEnd(String strdate) {date = parseDate(getMonthBegin(strdate));calendar = Calendar.getInstance();calendar.setTime(date);calendar.add(Calendar.MONTH, 1);calendar.add(Calendar.DAY_OF_YEAR, -1);return formatDate(calendar.getTime());}/** * 功能描述：常用的格式化日期 *  * @param date *            Date 日期 * @return String 日期字符串 yyyy-MM-dd格式 */public static String formatDate(Date date) {return formatDateByFormat(date, "yyyy-MM-dd");}/** * 功能描述：以指定的格式来格式化日期 *  * @param date *            Date 日期 * @param format *            String 格式 * @return String 日期字符串 */public static String formatDateByFormat(Date date, String format) {String result = "";if (date != null) {try {SimpleDateFormat sdf = new SimpleDateFormat(format);result = sdf.format(date);} catch (Exception ex) {ex.printStackTrace();}}return result;}public static void main(String[] args) {Date d = new Date();System.out.println(d.toString());System.out.println(formatDate(d).toString());System.out.println(getMonthBegin(formatDate(d).toString()));System.out.println(getMonthBegin("2008/07/19"));System.out.println(getMonthEnd("2008/07/19"));System.out.println(addDate(d,15).toString());}}

/*[java]一个压缩工具类 zip2008年05月28日 星期三 17:48/** Zip.java** Created on 2008年4月2日, 下午2:20** To change this template, choose Tools | Template Manager* and open the template in the editor.*/package com.founder.mnp.utl;/**** @author GuoJiale*/import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.util.zip.ZipEntry;import java.util.zip.ZipOutputStream;public class ZipUtils {    static final int BUFFER = 2048;        public static boolean zip( String[] filename ,String outname){                boolean test = true;        try {            BufferedInputStream origin = null;            FileOutputStream dest = new FileOutputStream(outname);            ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(                    dest));            byte data[] = new byte[BUFFER];            // File f= new File("d:\\111\\");            //   File files[] = f.listFiles();                        for (int i = 0; i < filename.length; i++) {                File file = new File(filename[i]);                FileInputStream fi = new FileInputStream(file);                origin = new BufferedInputStream(fi, BUFFER);                ZipEntry entry = new ZipEntry(file.getName());                out.putNextEntry(entry);                int count;                while ((count = origin.read(data, 0, BUFFER)) != -1) {                    out.write(data, 0, count);                }                origin.close();            }            out.close();        } catch (Exception e) {            test = false;            e.printStackTrace();        }        return test;    }                public static void main(String argv[]) {        // File f= new File("d:\\111\\");        String[] filenames = new String[]{"F:\\12.jpg"};        zip(filenames,"F:/12.zip");    }} 

package com.test.test;/************************************************MD5 算法的Java BeanLast Modified:10,Mar,2001 *************************************************/import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.math.BigInteger;import java.security.MessageDigest;import java.util.HashMap;import java.util.Map;import java.util.zip.CRC32;import java.util.zip.CheckedInputStream;/************************************************* * md5 类实现了RSA Data Security, Inc.在提交给IETF 的RFC1321中的MD5 message-digest 算法。 *************************************************/public class MD5 {/* * 下面这些S11-S44实际上是一个44的矩阵，在原始的C实现中是用#define 实现的， 这里把它们实现成为static * final是表示了只读，切能在同一个进程空间内的多个 Instance间共享 */private static final int S11 = 7;private static final int S12 = 12;private static final int S13 = 17;private static final int S14 = 22;private static final int S21 = 5;private static final int S22 = 9;private static final int S23 = 14;private static final int S24 = 20;private static final int S31 = 4;private static final int S32 = 11;private static final int S33 = 16;private static final int S34 = 23;private static final int S41 = 6;private static final int S42 = 10;private static final int S43 = 15;private static final int S44 = 21;private static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0 };/* * 下面的三个成员是MD5计算过程中用到的3个核心数据，在原始的C实现中 被定义到MD5_CTX结构中 */private long[] state = new long[4]; // state (ABCD)private long[] count = new long[2]; // number of bits, modulo 2^64 (lsb// first)private byte[] buffer = new byte[64]; // input buffer/* * digestHexStr是MD5的唯一一个公共成员，是最新一次计算结果的 16进制ASCII表示. */private String digestHexStr;/* * digest,是最新一次计算结果的2进制内部表示，表示128bit的MD5值. */private byte[] digest = new byte[16];/** * getMD5ofStr是类MD5最主要的公共方法，入口参数是你想要进行MD5变换的字符串 * 返回的是变换完的结果，这个结果是从公共成员digestHexStr取得的． */public String getMD5ofStr(String inbuf) {md5Init();md5Update(inbuf.getBytes(), inbuf.length());md5Final();digestHexStr = "";for (int i = 0; i < 16; i++) {digestHexStr += byteHEX(digest[i]);}return digestHexStr;}// 这是MD5这个类的标准构造函数，JavaBean要求有一个public的并且没有参数的构造函数public MD5() {md5Init();return;}/* md5Init是一个初始化函数，初始化核心变量，装入标准的幻数 */private void md5Init() {count[0] = 0L;count[1] = 0L;// /* Load magic initialization constants.state[0] = 0x67452301L;state[1] = 0xefcdab89L;state[2] = 0x98badcfeL;state[3] = 0x10325476L;return;}/* * F, G, H ,I 是4个基本的MD5函数，在原始的MD5的C实现中，由于它们是 * 简单的位运算，可能出于效率的考虑把它们实现成了宏，在java中，我们把它们 实现成了private方法，名字保持了原来C中的。 */private long F(long x, long y, long z) {return (x & y) | ((~x) & z);}private long G(long x, long y, long z) {return (x & z) | (y & (~z));}private long H(long x, long y, long z) {return x ^ y ^ z;}private long I(long x, long y, long z) {return y ^ (x | (~z));}/* * Rotation is separate from addition to prevent recomputation. */private long FF(long a, long b, long c, long d, long x, long s, long ac) {a += F(b, c, d) + x + ac;a = ((int) a << s) | ((int) a >>> (32 - s));a += b;return a;}private long GG(long a, long b, long c, long d, long x, long s, long ac) {a += G(b, c, d) + x + ac;a = ((int) a << s) | ((int) a >>> (32 - s));a += b;return a;}private long HH(long a, long b, long c, long d, long x, long s, long ac) {a += H(b, c, d) + x + ac;a = ((int) a << s) | ((int) a >>> (32 - s));a += b;return a;}private long II(long a, long b, long c, long d, long x, long s, long ac) {a += I(b, c, d) + x + ac;a = ((int) a << s) | ((int) a >>> (32 - s));a += b;return a;}/* * md5Update是MD5的主计算过程，inbuf是要变换的字节串，inputlen是长度，这个 * 函数由getMD5ofStr调用，调用之前需要调用md5init，因此把它设计成private的 */private void md5Update(byte[] inbuf, int inputLen) {int i, index, partLen;byte[] block = new byte[64];index = (int) (count[0] >>> 3) & 0x3F;// /* Update number of bits */if ((count[0] += (inputLen << 3)) < (inputLen << 3))count[1]++;count[1] += (inputLen >>> 29);partLen = 64 - index;// Transform as many times as possible.if (inputLen >= partLen) {md5Memcpy(buffer, inbuf, index, 0, partLen);md5Transform(buffer);for (i = partLen; i + 63 < inputLen; i += 64) {md5Memcpy(block, inbuf, 0, i, 64);md5Transform(block);}index = 0;} elsei = 0;// /* Buffer remaining input */md5Memcpy(buffer, inbuf, index, i, inputLen - i);}/* * md5Final整理和填写输出结果 */private void md5Final() {byte[] bits = new byte[8];int index, padLen;// /* Save number of bits */Encode(bits, count, 8);// /* Pad out to 56 mod 64.index = (int) (count[0] >>> 3) & 0x3f;padLen = (index < 56) ? (56 - index) : (120 - index);md5Update(PADDING, padLen);// /* Append length (before padding) */md5Update(bits, 8);// /* Store state in digest */Encode(digest, state, 16);}/* * md5Memcpy是一个内部使用的byte数组的块拷贝函数，从input的inpos开始把len长度的 * 字节拷贝到output的outpos位置开始 */private void md5Memcpy(byte[] output, byte[] input, int outpos, int inpos,int len) {int i;for (i = 0; i < len; i++)output[outpos + i] = input[inpos + i];}/* * md5Transform是MD5核心变换程序，有md5Update调用，block是分块的原始字节 */private void md5Transform(byte block[]) {long a = state[0], b = state[1], c = state[2], d = state[3];long[] x = new long[16];Decode(x, block, 64);/* Round 1 */a = FF(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */c = FF(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */d = FF(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */c = FF(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */b = FF(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */a = FF(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */b = FF(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */a = FF(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */d = FF(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */c = FF(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */b = FF(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 *//* Round 2 */a = GG(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */d = GG(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */c = GG(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */a = GG(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */d = GG(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */d = GG(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */b = GG(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */c = GG(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 *//* Round 3 */a = HH(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */d = HH(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */b = HH(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */a = HH(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */d = HH(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */b = HH(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 *//* Round 4 */a = II(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */d = II(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */c = II(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */b = II(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */a = II(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */c = II(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */b = II(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */c = II(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */b = II(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */a = II(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */d = II(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */b = II(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */state[0] += a;state[1] += b;state[2] += c;state[3] += d;}/* * Encode把long数组按顺序拆成byte数组，因为java的long类型是64bit的， 只拆低32bit，以适应原始C实现的用途 */private void Encode(byte[] output, long[] input, int len) {int i, j;for (i = 0, j = 0; j < len; i++, j += 4) {output[j] = (byte) (input[i] & 0xffL);output[j + 1] = (byte) ((input[i] >>> 8) & 0xffL);output[j + 2] = (byte) ((input[i] >>> 16) & 0xffL);output[j + 3] = (byte) ((input[i] >>> 24) & 0xffL);}}/* * Decode把byte数组按顺序合成成long数组，因为java的long类型是64bit的， * 只合成低32bit，高32bit清零，以适应原始C实现的用途 */private void Decode(long[] output, byte[] input, int len) {int i, j;for (i = 0, j = 0; j < len; i++, j += 4)output[i] = b2iu(input[j]) | (b2iu(input[j + 1]) << 8)| (b2iu(input[j + 2]) << 16) | (b2iu(input[j + 3]) << 24);return;}/** * b2iu是我写的一个把byte按照不考虑正负号的原则的＂升位＂程序，因为java没有unsigned运算 */public static long b2iu(byte b) {return b < 0 ? b & 0x7F + 128 : b;}/** * byteHEX()，用来把一个byte类型的数转换成十六进制的ASCII表示， * 因为java中的byte的toString无法实现这一点，我们又没有C语言中的 sprintf(outbuf,"%02X",ib) */public static String byteHEX(byte ib) {char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A','B', 'C', 'D', 'E', 'F' };char[] ob = new char[2];ob[0] = Digit[(ib >>> 4) & 0X0F];ob[1] = Digit[ib & 0X0F];String s = new String(ob);return s;}//-----------------------------------------------------------/** * 获取单个文件的MD5值！ * @param file * @return */public static String getFileMD5(File file) {if (!file.isFile()) {return null;}MessageDigest digest = null;FileInputStream in = null;byte buffer[] = new byte[1024];int len;try {digest = MessageDigest.getInstance("MD5");in = new FileInputStream(file);while ((len = in.read(buffer, 0, 1024)) != -1) {digest.update(buffer, 0, len);}in.close();} catch (Exception e) {e.printStackTrace();return null;}BigInteger bigInt = new BigInteger(1, digest.digest());return bigInt.toString(16).toUpperCase();}  /** * 获取单个文件的SHA1值！ *  * @param file * @return */public static String getFileSHA1(File file) {if (!file.isFile()) {return null;}MessageDigest digest = null;FileInputStream in = null;byte buffer[] = new byte[1024];int len;try {digest = MessageDigest.getInstance("SHA1");in = new FileInputStream(file);while ((len = in.read(buffer, 0, 1024)) != -1) {digest.update(buffer, 0, len);}in.close();} catch (Exception e) {e.printStackTrace();return null;}BigInteger bigInt = new BigInteger(1, digest.digest());return bigInt.toString(16).toUpperCase();}/** * 获取单个文件的CRC32值！ * @param file * @return * @throws Exception */public static String getFileCRC32(File file) {FileInputStream fileinputstream;try {fileinputstream = new FileInputStream(file);CRC32 crc32 = new CRC32();for (CheckedInputStream checkedinputstream = new CheckedInputStream(fileinputstream, crc32); checkedinputstream.read() != -1;) {}return Long.toHexString(crc32.getValue());} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}/** * 获取文件夹中文件的MD5值 *  * @param file * @param listChild *            ;true递归子目录中的文件 * @return */public static Map<String, String> getDirMD5(File file, boolean listChild) {if (!file.isDirectory()) {return null;}// <filepath,md5>Map<String, String> map = new HashMap<String, String>();String md5;File files[] = file.listFiles();for (int i = 0; i < files.length; i++) {File f = files[i];if (f.isDirectory() && listChild) {map.putAll(getDirMD5(f, listChild));} else {md5 = getFileMD5(f);if (md5 != null) {map.put(f.getPath(), md5);}}}return map;}/** * 获取文件夹中文件的SHA1值 *  * @param file * @param listChild *            ;true递归子目录中的文件 * @return */public static Map<String, String> getDirSHA1(File file, boolean listChild) {if (!file.isDirectory()) {return null;}// <filepath,SHA1>Map<String, String> map = new HashMap<String, String>();String sha1;File files[] = file.listFiles();for (int i = 0; i < files.length; i++) {File f = files[i];if (f.isDirectory() && listChild) {map.putAll(getDirSHA1(f, listChild));} else {sha1 = getFileSHA1(f);if (sha1 != null) {map.put(f.getPath(), sha1);}}}return map;}/** * 获取文件夹中文件的CRC32值 *  * @param file * @param listChild *            ;true递归子目录中的文件 * @return */public static Map<String, String> getDirCRC32(File file, boolean listChild) {if (!file.isDirectory()) {return null;}// <filepath,CRC32>Map<String, String> map = new HashMap<String, String>();String crc32;File files[] = file.listFiles();for (int i = 0; i < files.length; i++) {File f = files[i];if (f.isDirectory() && listChild) {map.putAll(getDirCRC32(f, listChild));} else {crc32 = getFileCRC32(f);if (crc32 != null) {map.put(f.getPath(), crc32);}}}return map;}}

转自：http://wuhaidong.iteye.com/blog/1668689