字符串工具类-优快云博客

本文链接：https://blog.youkuaiyun.com/bp_fd_2011/article/details/6821841

package com;

import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;



public class StringUntil {
	/**
	 * 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]);
	}

	/**
	 * 
	 * 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 bf = new StringBuffer("");
		int index = -1;
		while ((index = source.indexOf(from)) != -1) {
			bf.append(source.substring(0, index) + to);
			source = source.substring(index + from.length());
			index = source.indexOf(from);
		}
		bf.append(source);
		return bf.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="" str="" string="" string="" public="" static="" string="" htmldecode="" str="" if="" null="" return="" null="" return="" replace="" replace="" str="" private="" static="" final="" string="" _br="'
 0) {
			c = str.charAt(index);
			if (c < 128) {
				length--;
			} else {
				length--;
				length--;
			}
			buff.append(c);
			index++;
		}
		buff.append("...");
		return buff.toString();

	}

	/**
	 * 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]*$");

		return pattern.matcher(str).matches();

	}

	/**
	 * 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 str) {
		Pattern pattern = Pattern.compile("^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$");
		return pattern.matcher(str).matches();
	}

	/**
	 * 判断输入的字符串是否为纯汉字
	 * @param str 传入的字符串
	 * @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();
	}

	/**
	 * 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;

	}

	/**
	 * 判断是不是合法手机 handset 手机号码
	 */

	public static boolean isHandset(String handset) {
		try {
			if (!handset.substring(0, 1).equals("1")) {
				return false;
			}
			if (handset == null || handset.length() != 11) {
				return false;
			}
			String check = "^[0123456789]+$";
			Pattern regex = Pattern.compile(check);
			Matcher matcher = regex.matcher(handset);
			boolean isMatched = matcher.matches();
			if (isMatched) {
				return true;
			} else {
				return false;
			}
		} catch (RuntimeException e) {
			return false;
		}
	}
	/**
	 * 数组转为字符串
	 * 
	 * @param String[] s 数组
	 * @param Stringcompart 分隔符
	 **/
	public static String ArrayToString(String[] s, String compart) {

		int fieldsNumber = s.length;
		String field = "";

		for (int i = 0; i < fieldsNumber; i++) {
			if ((i + 1) != fieldsNumber) {
				field += " " + compart + s[i] + compart + ",";
			} else {
				field += " " + compart + s[i] + compart;
			}
		}
		return field;

	}

	// ISO编码转换成GBK编码
	public static String convertGBK(String str) {
		try {
			if (isEmpty(str))
				return "";
			byte[] bytesStr = str.getBytes("ISO-8859-1");
			return new String(bytesStr, "gb2312");
		} catch (Exception ex) {
			return str;
		}
	}

	// GBK编码转换成ISO编码
	public static String convertISO(String str) {
		try {
			if (isEmpty(str))
				return "";
			byte[] bytesStr = str.getBytes("gb2312");
			return new String(bytesStr, "ISO-8859-1");
		} catch (Exception ex) {
			return str;
		}
	}

	/**
	 * 判断字符串是否为空
	 */
	public static boolean isEmpty(String str) {

		boolean flag = false;
		if (str == null || "".equals(str) || "null".equals(str)) {

			flag = true;
		} else {
			flag = false;
		}
		return flag;
	}

	/**
	 * 判断字符串是否为空
	 * 
	 * @return New String 空值而不是null
	 */
	public static String isNewStr(String str) {

		String flag = str;
		if (str == null || str.equals("") || str.equals("null"))
			flag = "";
		return flag;
	}

	/**
	 * YYYY-MM-DD
	 **/
	public static String getNowDate() {

		Calendar cal = Calendar.getInstance();
		int intMonth = cal.get(cal.MONTH) + 1;
		int intDate = cal.get(cal.DATE);
		String sMonth = String.valueOf(intMonth);
		String sDate = String.valueOf(intDate);
		if (intMonth < 10) {
			sMonth = "0" + sMonth;
		}
		if (intDate < 10) {
			sDate = "0" + sDate;
		}
		return cal.get(cal.YEAR) + "-" + sMonth + "-" + sDate;
	}

	public static String getProperties(String path, String propertiesName) {

		Properties prop = new Properties();
		String name = "";
		try {

			FileInputStream in = new FileInputStream(path);
			prop.load(in);
			in.close();
			name = prop.getProperty(propertiesName);
			prop.clear();

		} catch (Exception e) {
			e.printStackTrace();
		}
		return name;
	}

	/**
	 * 按照字节截取字符串长度
	 * 
	 * @param s
	 * @param length
	 * @return
	 * @throws Exception
	 */
	public static String bSubstring(String s, int length) throws Exception {

		byte[] bytes = s.getBytes("Unicode");
		int n = 0; // 表示当前的字节数
		int i = 2; // 要截取的字节数，从第3个字节开始
		for (; i < bytes.length && n < length; i++) {
			// 奇数位置，如3、5、7等，为UCS2编码中两个字节的第二个字节
			if (i % 2 == 1) {
				n++; // 在UCS2第二个字节时n加1
			} else {
				// 当UCS2编码的第一个字节不等于0时，该UCS2字符为汉字，一个汉字算两个字节
				if (bytes[i] != 0) {
					n++;
				}
			}
		}
		// 如果i为奇数时，处理成偶数
		if (i % 2 == 1)

		{
			// 该UCS2字符是汉字时，去掉这个截一半的汉字
			if (bytes[i - 1] != 0)
				i = i - 1;
			// 该UCS2字符是字母或数字，则保留该字符
			else
				i = i + 1;
		}

		return new String(bytes, 0, i, "Unicode");
	}

	public static String clearHtml(String str) {
		int flag1 = str.indexOf("<"); int="" flag2="str.indexOf('>');" while="" -1="" flag2="" -1="" str="clearHtmlPrivate(str);" flag1="str.indexOf('<');" flag2="str.indexOf('>');" return="" str="" private="" static="" string="" clearhtmlprivate="" str="" int="" start="str.indexOf('<');" int="" end="str.indexOf('>');" if="" -1="" end="" -1="" str="str.substring(0," start="" str="" 1="" return="" str="" public="" static="" string="" superclearhtml="" str="" str="str.replaceAll('

.*|'," replaceall="" return="" str="" public="" static="" string="" escape="" src="" int="" i="" char="" j="" stringbuffer="" tmp="new" stringbuffer="" tmp="" 6="" for="" 0="" i="" src="" i="" j="src.charAt(i);" if="" character="" character="" tmp="" else="" if="" 256="" tmp="" if="" 16="" tmp="" tmp="" 16="" else="" tmp="" tmp="" 16="" return="" tmp="" public="" static="" string="" unescape="" src="" if="" null="" return="" null="" stringbuffer="" tmp="new" stringbuffer="" tmp="" int="" lastpos="0," pos="0;" char="" ch="" while="" src="" pos="src.indexOf('%'," lastpos="" if="" lastpos="" if="" 1="" ch="(char)" integer="" 2="" pos="" 6="" 16="" tmp="" lastpos="pos" 6="" else="" if="" 1="" src="" 1="" tmp="" pos="" 1="" lastpos="pos" 1="" else="" ch="(char)" integer="" 1="" pos="" 3="" 16="" tmp="" lastpos="pos" 3="" else="" if="" -1="" tmp="" lastpos="src.length();" else="" tmp="" pos="" lastpos="pos;" return="" tmp="" yyyymmddhhnnssmi="" public="" static="" string="" getrandomnumber="" calendar="" cal="Calendar.getInstance();" int="" intmonth="cal.get(cal.MONTH)" 1="" int="" intdate="cal.get(cal.DATE);" int="" hh="cal.get(Calendar.HOUR);" int="" nn="cal.get(Calendar.MINUTE);" int="" ss="cal.get(Calendar.SECOND);" int="" mi="cal.get(Calendar.MILLISECOND);" string="" smonth="String.valueOf(intMonth);" string="" sdate="String.valueOf(intDate);" if="" 10="" smonth="0" smonth="" if="" 10="" sdate="0" sdate="" return="" cal="" smonth="" sdate="" hh="" nn="" ss="" mi="" public="" static="" string="" convertmarks="" args="" if="" if="" args="args.trim();" return="" args="" str="" public="" static="" string="" convertnull="" str="" boolean="" flag="false;" if="" null="" return="" else="" return="" str="" input="" public="" static="" string="" tosbc="" input="" char="" c="input.toCharArray();" for="" i="0;" i="" c="" i="" if="" 32="" c="" 12288="" continue="" if="" 127="" c="" 65248="" return="" new="" string="" input="" public="" static="" string="" todbc="" input="" char="" c="input.toCharArray();" for="" i="0;" i="" c="" i="" if="" 12288="" c="" 32="" continue="" if=""> 65280 && c[i] < 65375)
				c[i] = (char) (c[i] - 65248);
		}
		return new String(c);
	}
	public static void main(String[] args) {
		String str = "0.215";
		StringUntil s = new StringUntil();
		String aa = StringUntil.getRandomNumber();
		System.out.println(aa);

	}

}
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