工具类1:StringUtil

import java.io.File;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;
import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class StringUtil {

public StringUtil() {
}
/**
* 按长度分割字符串
*
* @param content
* @param len
* @return
*/
public static String[] split(String content, int len) {
if (content == null || content.equals("")) {
return null;
}
int len2 = content.length();
if (len2 <= len) {
return new String[] { content };
} else {
int i = len2 / len + 1;
System.out.println("i:" + i);
String[] strA = new String[i];
int j = 0;
int begin = 0;
int end = 0;
while (j < i) {
begin = j * len;
end = (j + 1) * len;
if (end > len2)
end = len2;
strA[j] = content.substring(begin, end);
// System.out.println(strA[j]+"<br/>");
j = j + 1;
}
return strA;
}
}

public static boolean emailFormat(String email)
    {
        boolean tag = true;
        final String pattern1 = "^([a-z0-9A-Z]+[-|_|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";
        final Pattern pattern = Pattern.compile(pattern1);
        final Matcher mat = pattern.matcher(email);
        if (!mat.find()) {
            tag = false;
        }
        return tag;
    }


    /**
     * 验证是不是EMAIL
     * @param email
     * @return
     */
public static boolean isEmail(String email) {
boolean retval = false;
String check = "^([a-z0-9A-Z]+[-|_|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";  
    Pattern regex = Pattern.compile(check);  
    Matcher matcher = regex.matcher(email);  
    retval = matcher.matches(); 
return retval;
}

/**
* 验证汉字为true
* @param s
* @return
*/
public static boolean isLetterorDigit(String s) {
if (s.equals("") || s == null) {
return false;
}
for (int i = 0; i < s.length(); i++) {
if (!Character.isLetterOrDigit(s.charAt(i))) {
// if (!Character.isLetter(s.charAt(i))){
return false;
}
}
// Character.isJavaLetter()
return true;
}
/**
* 判断某字符串是否为null，如果长度大于256，则返回256长度的子字符串，反之返回原串
* @param str
* @return
*/
public static String checkStr(String str){
if(str==null){
return "";
}else if(str.length()>256){
return str.substring(256);
}else{
return str;
}
}

/**
* 验证是不是Int
* validate a int string  
* @param str
* the Integer string.
* @return true if the str is invalid otherwise false.
*/
public static boolean validateInt(String str) {
if (str == null || str.trim().equals(""))
return false;

char c;
for (int i = 0, l = str.length(); i < l; i++) {
c = str.charAt(i);
if (!((c >= '0') && (c <= '9')))
return false;
}

return true;
}
/**
* 字节码转换成16进制字符串 内部调试使用
*
* @param b
* @return
*/
public static String byte2hex(byte[] b) {
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
if (stmp.length() == 1)
hs = hs + "0" + stmp;
else
hs = hs + stmp;
if (n < b.length - 1)
hs = hs + ":";
}
return hs.toUpperCase();
}

/**
* 字节码转换成自定义字符串 内部调试使用
*
* @param b
* @return
*/
public static String byte2string(byte[] b) {
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
if (stmp.length() == 1)
hs = hs + "0" + stmp;
else
hs = hs + stmp;
// if (n<b.length-1) hs=hs+":";
}
return hs.toUpperCase();
}

public static byte[] string2byte(String hs) {
byte[] b = new byte[hs.length() / 2];
for (int i = 0; i < hs.length(); i = i + 2) {
String sub = hs.substring(i, i + 2);
byte bb = new Integer(Integer.parseInt(sub, 16)).byteValue();
b[i / 2] = bb;
}
return b;
}

/**
* 验证字符串是否为空
* @param param
* @return
*/
public static boolean empty(String param) {
return param == null || param.trim().length() < 1;
}

// 验证英文字母或数据
public static boolean isLetterOrDigit(String str) {
java.util.regex.Pattern p = null; // 正则表达式
java.util.regex.Matcher m = null; // 操作的字符串
boolean value = true;
try {
p = java.util.regex.Pattern.compile("[^0-9A-Za-z]");
m = p.matcher(str);
if (m.find()) {

value = false;
}
} catch (Exception e) {
}
return value;
}

/**
     * 验证是否是小写字符串
     */
@SuppressWarnings("unused")
private static boolean isLowerLetter(String str) {
java.util.regex.Pattern p = null; // 正则表达式
java.util.regex.Matcher m = null; // 操作的字符串
boolean value = true;
try {
p = java.util.regex.Pattern.compile("[^a-z]");
m = p.matcher(str);
if (m.find()) {
value = false;
}
} catch (Exception e) {
}
return value;
}


/**
* 判断一个字符串是否都为数字
* @param strNum
* @return
*/
public static boolean isDigit(String strNum) {
return strNum.matches("[0-9]{1,}");
}

/**
* 判断一个字符串是否都为数字
* @param strNum
* @return
*/
public static boolean isDigit2(String strNum) {
Pattern pattern = Pattern.compile("[0-9]{1,}");
Matcher matcher = pattern.matcher((CharSequence) strNum);
return matcher.matches();
}

    /**
     * 截取数字
     * @param content
     * @return
     */
    public static String getNumbers(String content) {
        Pattern pattern = Pattern.compile("\\d+");
        Matcher matcher = pattern.matcher(content);
        while (matcher.find()) {
            return matcher.group(0);
        }
        return "";
    }

/**
* 截取非数字
* @param content
* @return
*/
public static String splitNotNumber(String content) {
Pattern pattern = Pattern.compile("\\D+");
Matcher matcher = pattern.matcher(content);
while (matcher.find()) {
return matcher.group(0);
}
return "";
}


public static String encode(String str, String code) {
try {
return URLEncoder.encode(str, code);
} catch (Exception ex) {
ex.fillInStackTrace();
return "";
}
}

public static String decode(String str, String code) {
try {
return URLDecoder.decode(str, code);
} catch (Exception ex) {
ex.fillInStackTrace();
return "";
}
}

public static String nvl(String param) {
return param != null ? param.trim() : "";
}

public static int parseInt(String param, int d) {
int i = d;
try {
i = Integer.parseInt(param);
} catch (Exception e) {
}
return i;
}

public static int parseInt(String param) {
return parseInt(param, 0);
}

public static long parseLong(String param) {
long l = 0L;
try {
l = Long.parseLong(param);
} catch (Exception e) {
}
return l;
}

public static double parseDouble(String param) {
return parseDouble(param, 1.0);
}

public static double parseDouble(String param, double t) {
double tmp = 0.0;
try {
tmp = Double.parseDouble(param.trim());
} catch (Exception e) {
tmp = t;
}
return tmp;
}

public static boolean parseBoolean(String param) {
if (empty(param))
return false;
switch (param.charAt(0)) {
case 49: // '1'
case 84: // 'T'
case 89: // 'Y'
case 116: // 't'
case 121: // 'y'
return true;

}
return false;
}

/**
* public static String replace(String mainString, String oldString, String
* newString) { if(mainString == null) return null; int i =
* mainString.lastIndexOf(oldString); if(i < 0) return mainString;
* StringBuffer mainSb = new StringBuffer(mainString); for(; i >= 0; i =
* mainString.lastIndexOf(oldString, i - 1)) mainSb.replace(i, i +
* oldString.length(), newString);
*
* return mainSb.toString(); }
*
*/

@SuppressWarnings({ "unchecked", "rawtypes" })
public static final String[] split(String str, String delims) {
StringTokenizer st = new StringTokenizer(str, delims);
ArrayList list = new ArrayList();
for (; st.hasMoreTokens(); list.add(st.nextToken()))
;
return (String[]) list.toArray(new String[list.size()]);
}




public static String substring(String str, int length) {
if (str == null)
return null;

if (str.length() > length)
return (str.substring(0, length - 2) + "...");
else
return str;
}

public static boolean validateDouble(String str) throws RuntimeException {
if (str == null)
// throw new RuntimeException("null input");
return false;
char c;
int k = 0;
for (int i = 0, l = str.length(); i < l; i++) {
c = str.charAt(i);
if (!((c >= '0') && (c <= '9')))
if (!(i == 0 && (c == '-' || c == '+')))
if (!(c == '.' && i < l - 1 && k < 1))
// throw new RuntimeException("invalid number");
return false;
else
k++;
}
return true;
}

public static boolean validateMobile(String str, boolean includeUnicom) {
if (str == null || str.trim().equals(""))
return false;
str = str.trim();

if (str.length() != 11 || !validateInt(str))
return false;

if (includeUnicom
&& (str.startsWith("130") || str.startsWith("133") || str.startsWith("131")))
return true;

if (!(str.startsWith("139") || str.startsWith("138") || str.startsWith("137")
|| str.startsWith("136") || str.startsWith("135")))
return false;
return true;
}

public static boolean validateMobile(String str) {
return validateMobile(str, false);
}

/**
* delete file
*
* @param fileName
* @return -1 exception,1 success,0 false,2 there is no one directory of the
*         same name in system
*/
public static int deleteFile(String fileName) {
File file = null;
int returnValue = -1;
try {
file = new File(fileName);
if (file.exists())
if (file.delete())
returnValue = 1;
else
returnValue = 0;
else
returnValue = 2;

} catch (Exception e) {
System.out.println("Exception:e=" + e.getMessage());
} finally {
file = null;
// return returnValue;
}
return returnValue;
}

public static String gbToIso(String s) throws UnsupportedEncodingException {
return covertCode(s, "GB2312", "ISO8859-1");
}

public static String covertCode(String s, String code1, String code2)
throws UnsupportedEncodingException {
if (s == null)
return null;
else if (s.trim().equals(""))
return "";
else
return new String(s.getBytes(code1), code2);
}

public static String transCode(String s0) throws UnsupportedEncodingException {
if (s0 == null || s0.trim().equals(""))
return null;
else {
s0 = s0.trim();
return new String(s0.getBytes("GBK"), "ISO8859-1");
}
}
/**
* 编码转换
* @param s
* @return
*/
public static String GBToUTF8(String s) {
try {
StringBuffer out = new StringBuffer("");
byte[] bytes = s.getBytes("unicode");
for (int i = 2; i < bytes.length - 1; i += 2) {
out.append("\\u");
String str = Integer.toHexString(bytes[i + 1] & 0xff);
for (int j = str.length(); j < 2; j++) {
out.append("0");
}
out.append(str);
String str1 = Integer.toHexString(bytes[i] & 0xff);
for (int j = str1.length(); j < 2; j++) {
out.append("0");
}

out.append(str1);
}
return out.toString();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return null;
}
}

@SuppressWarnings("unused")
public static final String[] replaceAll(String[] obj, String oldString, String newString) {
if (obj == null) {
return null;
}
int length = obj.length;
String[] returnStr = new String[length];
String str = null;
for (int i = 0; i < length; i++) {
returnStr[i] = replaceAll(obj[i], oldString, newString);
}
return returnStr;
}
/**
* 字符串全文替换
* @param s0
* @param oldstr
* @param newstr
* @return
*/
public static String replaceAll(String s0, String oldstr, String newstr) {
if (s0 == null || s0.trim().equals(""))
return null;
StringBuffer sb = new StringBuffer(s0);
int begin = 0;
// int from = 0;
begin = s0.indexOf(oldstr);
while (begin > -1) {
sb = sb.replace(begin, begin + oldstr.length(), newstr);
s0 = sb.toString();
begin = s0.indexOf(oldstr, begin + newstr.length());
}
return s0;
}

public static String toHtml(String str) {
String html = str;
if (str == null || str.length() == 0) {
return str;
}
html = replaceAll(html, "&", "&amp;");
html = replaceAll(html, "<", "&lt;");
html = replaceAll(html, ">", "&gt;");
html = replaceAll(html, "\r\n", "\n");
html = replaceAll(html, "\n", "<br>\n");
html = replaceAll(html, "\t", "         ");
html = replaceAll(html, " ", "&nbsp;");
return html;
}

/**
* 字符串替换
* @param line
* @param oldString
* @param newString
* @return
*/
public static final String replace(String line, String oldString, String newString) {
if (line == null) {
return null;
}
int i = 0;
if ((i = line.indexOf(oldString, i)) >= 0) {
char[] line2 = line.toCharArray();
char[] newString2 = newString.toCharArray();
int oLength = oldString.length();
StringBuffer buf = new StringBuffer(line2.length);
buf.append(line2, 0, i).append(newString2);
i += oLength;
int j = i;
while ((i = line.indexOf(oldString, i)) > 0) {
buf.append(line2, j, i - j).append(newString2);
i += oLength;
j = i;
}
buf.append(line2, j, line2.length - j);
return buf.toString();
}
return line;
}

public static final String replaceIgnoreCase(String line, String oldString, String newString) {
if (line == null) {
return null;
}
String lcLine = line.toLowerCase();
String lcOldString = oldString.toLowerCase();
int i = 0;
if ((i = lcLine.indexOf(lcOldString, i)) >= 0) {
char[] line2 = line.toCharArray();
char[] newString2 = newString.toCharArray();
int oLength = oldString.length();
StringBuffer buf = new StringBuffer(line2.length);
buf.append(line2, 0, i).append(newString2);
i += oLength;
int j = i;
while ((i = lcLine.indexOf(lcOldString, i)) > 0) {
buf.append(line2, j, i - j).append(newString2);
i += oLength;
j = i;
}
buf.append(line2, j, line2.length - j);
return buf.toString();
}
return line;
}

/**
* 标签转义
* @param input
* @return
*/
public static final String escapeHTMLTags(String input) {
// Check if the string is null or zero length -- if so, return
// what was sent in.
if (input == null || input.length() == 0) {
return input;
}
// Use a StringBuffer in lieu of String concatenation -- it is
// much more efficient this way.
StringBuffer buf = new StringBuffer(input.length());
char ch = ' ';
for (int i = 0; i < input.length(); i++) {
ch = input.charAt(i);
if (ch == '<') {
buf.append("&lt;");
} else if (ch == '>') {
buf.append("&gt;");
} else {
buf.append(ch);
}
}
return buf.toString();
}

/**
* Returns a random String of numbers and letters of the specified length.
* The method uses the Random class that is built-in to Java which is
* suitable for low to medium grade security uses. This means that the
* output is only pseudo random, i.e., each number is mathematically
* generated so is not truly random.
* <p>
*
* For every character in the returned String, there is an equal chance that
* it will be a letter or number. If a letter, there is an equal chance that
* it will be lower or upper case.
* <p>
*
* The specified length must be at least one. If not, the method will return
* null.
*
* @param length
*            the desired length of the random String to return.
* @return a random String of numbers and letters of the specified length.
*/

private static Random randGen = null;
private static Object initLock = new Object();
private static char[] numbersAndLetters = null;

public static final String randomString(int length) {
if (length < 1) {
return null;
}
// Init of pseudo random number generator.
if (randGen == null) {
synchronized (initLock) {
if (randGen == null) {
randGen = new Random();
// Also initialize the numbersAndLetters array
numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz"
+ "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
}
}
}
// Create a char buffer to put random letters and numbers in.
char[] randBuffer = new char[length];
for (int i = 0; i < randBuffer.length; i++) {
randBuffer[i] = numbersAndLetters[randGen.nextInt(71)];
}
return new String(randBuffer);
}

/**
* 固定长度字符串截取
* @param content
* @param i
* @return
*/
public static String getSubstring(String content, int i) {
int varsize = 10;
String strContent = content;
if (strContent.length() < varsize + 1) {
return strContent;
} else {
int max = (int) Math.ceil((double) strContent.length() / varsize);
if (i < max - 1) {
return strContent.substring(i * varsize, (i + 1) * varsize);
} else {
return strContent.substring(i * varsize);
}
}
}

/**
* 日期转String
* @param pattern
* @return
*/
public static String now(String pattern) {
return dateToString(new Date(), pattern);
}

public static String dateToString(Date date, String pattern) {
if (date == null) {
return "";
} else {
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
return sdf.format(date);
}
}

public static synchronized String getNow() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
return sdf.format(new Date());
}

/**
* String转Date
* @param strDate
* @param pattern
* @return
* @throws ParseException
*/
public static java.sql.Date stringToDate(String strDate, String pattern) throws ParseException {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
Date date = simpleDateFormat.parse(strDate);
long lngTime = date.getTime();
return new java.sql.Date(lngTime);
}

public static java.util.Date stringToUtilDate(String strDate, String pattern)
throws ParseException {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
return simpleDateFormat.parse(strDate);
}

public static String formatHTMLOutput(String s) {
if (s == null)
return null;

if (s.trim().equals(""))
return "";

String formatStr;
formatStr = replaceAll(s, " ", "&nbsp;");
formatStr = replaceAll(formatStr, "\n", "<br />");

return formatStr;
}

/*
* 4舍5入 @param num 要调整的数 @param x 要保留的小数位
*/
public static double myround(double num, int x) {
BigDecimal b = new BigDecimal(num);
return b.setScale(x, BigDecimal.ROUND_HALF_UP).doubleValue();
}

/*
* public static String getSubstring(String content,int i){ int varsize=10;
* String strContent=content; if(strContent.length()<varsize+1){ return
* strContent; }else{ int
* max=(int)Math.ceil((double)strContent.length()/varsize); if(i<max-1){
* return strContent.substring(i*varsize,(i+1)*varsize); }else{ return
* strContent.substring(i*varsize); } } }
*/


   
/**
* liuqs
*
* @param param
* @param d
* @return
*/
public static int parseLongInt(Long param, int d) {
int i = d;
try {
i = Integer.parseInt(String.valueOf(param));
} catch (Exception e) {
}
return i;
}

public static int parseLongInt(Long param) {
return parseLongInt(param, 0);
}



public static String returnString(Object obj) {
if (obj == null) {
return "";
} else {
return obj.toString();
}
}




/**
     * 修改敏感字符编码
     * @param value
     * @return
     */
public static String htmlEncode(String value){
    String re[][] = {{"<","&lt;"},
                     {">","&gt;"},
                     {"\"","&quot;"},
                     {"\\′","&acute;"},
                     {"&","&amp;"}
                    };
  
    for(int i=0; i<4; i++){
        value = value.replaceAll(re[i][0], re[i][1]);
    }
    return value;
}
/**
     * 防SQL注入
     *
     * @param str
     * @return
     */
public static boolean sql_inj(String str) {
String inj_str = "'|and|exec|insert|select|delete|update|count|*|%|chr|mid|master|truncate|char|declare|;|or|-|+|,";
String inj_stra[] = inj_str.split("|");
for (int i=0 ; i < inj_stra.length ; i++ )
{
if (str.indexOf(inj_stra[i])>=0)
{
return true;
}
}
return false;
}


}
转自：http://lucien-zzy.iteye.com/blog/2019807