Java String工具类StringHelper

2018-07-20    来源:open-open

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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);

    }

}

标签: isp 代码

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