String工具类StringHelper

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StringHelper

主要功能是字符串与InputStream、byte数组的转换，判断手机号，判断中文、判断邮箱、判断邮编、四舍五入、取几位小数等。
代码如下：

import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.StringWriter;import java.math.BigDecimal;import java.util.regex.Matcher;import java.util.regex.Pattern;import android.text.TextUtils;public class StringHelper {    private static StringHelper util;    public final String[] PHONE_PREFIX = new String[] { "130", "131", "132",            "133", "134", "135", "136", "137", "138", "139", "150", "151",            "152", "153", "154", "155", "156", "157", "158", "159", "180",            "181", "182", "183", "184", "185", "186", "187", "188", "189" };    public static StringHelper getInstance() {        if (util == null) {            util = new StringHelper();        }        return util;    }    private StringHelper() {        super();    }    /**     * InputStream转byte数组     *      * @param is     * @return     */    public byte[] stream2Byte(InputStream is) {        byte[] in_b = null;        try {            ByteArrayOutputStream os = new ByteArrayOutputStream();            int i = -1;            while ((i = is.read()) != -1) {                os.write(i);            }            in_b = os.toByteArray();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return in_b;    }    /**     * InputStream 转String     *      * @param is     * @return     */    public String stream2String(InputStream is) {        try {            BufferedReader br = new BufferedReader(new InputStreamReader(is));            StringWriter sw = new StringWriter();            int i = -1;            while ((i = br.read()) != -1) {                sw.write(i);            }            return sw.getBuffer().toString();        } catch (Exception e) {            // TODO: handle exception        }        return null;    }    /**     * 字符串转InputStream     *      * @param str     * @return     */    public InputStream string2Stream(String str) {        ByteArrayInputStream is = new ByteArrayInputStream(str.getBytes());        return is;    }    /**     * byte数组转InputStream     *      * @param by     * @return     */    public InputStream byte2Stream(byte[] by) {        ByteArrayInputStream stream = new ByteArrayInputStream(by);        return stream;    }    /**     * 判断是否是中文字符,只能判断部分CJK字符     *      * @param str     * @return     */    public boolean isChina(String str) {        Pattern p = Pattern.compile("[\\u4E00-\\u9FBF]+");        Matcher m = p.matcher(str);        return m.matches();    }    /**     * 根据Unicode编码完美的判断中文汉字和符号     *      * @param c     * @return     */    private boolean isChinese(char c) {        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);        if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS                || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION                || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION) {            return true;        }        return false;    }    /**     * 判断是否包含中文汉字     *      * @param strName     * @return     */    public boolean isChineseHave(String strName) {        char[] ch = strName.toCharArray();        for (int i = 0; i < ch.length; i++) {            char c = ch[i];            if (isChinese(c)) {                return true;            }        }        return false;    }    /**     * 判断是否只有中文汉字     *      * @param strName     * @return     */    public boolean isChineseAll(String strName) {        char[] ch = strName.toCharArray();        for (int i = 0; i < ch.length; i++) {            char c = ch[i];            if (!isChinese(c)) {                return false;            }        }        return true;    }    /**     * 判断邮政编码     *      * @param str     * @return     */    public boolean isCard(String str) {        Pattern p = Pattern.compile("[1-9]\\d{5}(?!\\d)");        Matcher m = p.matcher(str);        return m.matches();    }    /**     * 检测邮箱合法性     *      * @param email     * @return     */    public boolean isEmail(String email) {        if ((email == null) || (email.trim().length() == 0)) {            return false;        }        String regEx = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,4}$";        Pattern p = Pattern.compile(regEx);        Matcher m = p.matcher(email.trim().toLowerCase());        return m.find();    }    /**     * 检查手机号码合法性     *      * @param mdn     * @return     */    public boolean isPhoneNumber(String mdn, boolean checkLen) {        if (mdn == null || mdn.equals("")) {            return false;        }        if (mdn.startsWith("+86")) {            mdn = mdn.substring(3);        }        if (checkLen && mdn.length() != 11) {            return false;        }        boolean flag = false;        String p = mdn.length() > 3 ? mdn.substring(0, 3) : mdn;        for (int i = 0; i < PHONE_PREFIX.length; i++) {            if (p.equals(PHONE_PREFIX[i])) {                flag = true;                break;            }        }        if (!flag) {            return false;        }        return true;    }    /**     * 判断字符串中是否是整型数字     *      * @param str     * @return     */    public boolean isInt(String str) {        if (!TextUtils.isEmpty(str)) {            return str.toString().matches("^[-]?\\d+$");        }        return false;    }    /**     * 字符串转整型     *      * @param str     * @return     */    public int getInt(String str) {        if (!TextUtils.isEmpty(str)) {            String newValue = str.toString().replaceAll("\\D+", "");            if (!TextUtils.isEmpty(newValue)) {                return 0;            }            return Integer.parseInt(newValue);        }        return 0;    }    /**     * 判断字符串中是否是Double     *      * @param str     * @return     */    public boolean isDouble(String str) {        if (!TextUtils.isEmpty(str)) {            return str.toString().matches("^\\d+(\\.[\\d]+)?$");        }        return false;    }    /**     * 字符串转Double     *      * @param str     * @return     */    public double getDouble(String str) {        if (!TextUtils.isEmpty(str)) {            if (isDouble(str))                return Double.parseDouble(str);            else                return 0.0D;        }        return 0.0D;    }    /**     * 字符串转Double,并进行四舍五入     *      * @param v     * @param scale     * @return     */    public double getDouble(String str, int scale) {        Double v = getDouble(str);        return getDouble(v, scale);    }    /**     * Double进行四舍五入     *      * @param v     * @param scale     * @return     */    public double getDouble(Double v, int scale) {        if (scale < 0) {            scale = 0;        }        BigDecimal b = new BigDecimal(v);        BigDecimal one = new BigDecimal("1");        return b.divide(one, scale, BigDecimal.ROUND_HALF_UP).doubleValue();    }    /**     * 得到指定位数的小数     * @param v     * @param scale     * @return     */    public String getDecimals(Double v, int scale) {        return String.format("%." + String.valueOf(scale) + "f", v);    }    /**     * 得到指定位数的小数     * @param v     * @param scale     * @return     */    public String getDecimals(String v, int scale) {        return getDecimals(getDouble(v), scale);    }}
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