字符串相关

java_判断是否中文字符

public class IsChineseOrEnglish{
    //GENERAL_PUNCTUATION 判断中文的“号
    //CJK_SYMBOLS_and_punctuation 判断中文的。号
    //HALFWIDTH_AND_FULLWIDTH_FORMS 判断中中文的，号

    public static boolean isChinese(Char c){
        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
        if(ub == Character.UnicodeBlock.CJK_SYMBOLS_and_punctuation
            || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
            || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
            || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
            || ub == Character.UnicodeBlock.CJK_SYMBOLS_and_punctuation
            || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS){
                return true;
        }
        return false;
    }

    public static void isChiese(String strName){
        char[] ch = strName.toCharArray();
        for(int i = 0; i < ch.length; i++){
            char c = ch[i];
            if(isChinese(c) == true){
                System.out.println(isChiese(c));
                return;
            } else {
                System.out.println(isChiese(c));
                return;
            }
        }
    }

    public static void main(String[] args){
        Random r = new Random();
        for(int i = 0; i < 20; i++){
            System.out.println(r.nextInt(10) + 1);
            isChinese("き");
            isChinese("中国");
        }
    }
}

验证日期格式的正确性

private boolean isDateFormatCorrect(String dataTime){
    String el="^((\\d{2}(([02468][048])|([13579][26]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][1235679])|([13579][01345789]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))(\\s(((0?[0-9])|([1-2][0-9]))\\:([0-5]?[0-9])((\\s)|(\\:([0-5]?[0-9])))))?$";
    Pattern pattern = Pattern.compile(el);
    Matcher matcher = pattern.matcher(dataTime);
    return matcher.matches();
}

可以验证yyyy(\s/-)?MM(\s/-)?dd(\shh:mm:ss)?

String 转 Date

/**
 * 字符串转Date
 * @param format yyyy-MM-dd HH:mm:ss.SSS
 * @param dateStr 要转换的字符串
 * @return
 */
public static Date strToDate(String format, String dateStr){
    Date date = null;
    try {
        date = new SimpleDateFormat(format).parse(dateStr);
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return date;
}

Date 转 String

Date ddate;  
String sdate=(new SimpleDateFormat("yyyy-MM-dd")).format(ddate); 

俩时间比较大小

@SuppressLint("SimpleDateFormat")
private SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm");
private boolean startCompareToEnd(String startDate, String endDate){
    if(startDate == null || "".equals(startDate) || "null".equals(startDate)
       || endDate == null || "".equals(endDate) || "null".equals(endDate)){
        return false;
    }
    //FIXME:输入字符串的格式与df格式比较下
    
    try {
        Date start = df.parse(startDate);
        Date end = df.parse(endDate);
        if(start.getTime() >= end.getTime()){
            return true;
        }
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return false;
}

随机生成数字

//生成6位随机数字
System.out.println((int)((Math.random()*9+1)*100000));
//生成5位随机数字
System.out.println((int)((Math.random()*9+1)*10000));
//生成4位随机数字
System.out.println((int)((Math.random()*9+1)*1000));
//生成3位随机数字
System.out.println((int)((Math.random()*9+1)*100));
//生成2位随机数字
System.out.println((int)((Math.random()*9+1)*10));
//生成1位随机数字
System.out.println((int)((Math.random()*9+1)));

字符串：截取pre和end之间的内容

public class Test {
    public static void main(String[] args){
        String url = "https://sbc2h5.laidy.cn/channelStoreList?easyChannelId=1252&storeId=123";
        String url2 = "https://sbc2h5.laidy.cn/channelStoreList?easyChannelId=1252";
        String url3 = "https://sbc2h5.laidy.cn/channelStoreList?storeId=123";

        String easyChannelIdPre = "easyChannelId=";
        String end = "&";
        String storeIdPre = "storeId=";

        System.out.println(getContent(url, easyChannelIdPre, end));
        System.out.println(getContent(url, storeIdPre, end));
        System.out.println("========================" + url);

        System.out.println(getContent(url2, easyChannelIdPre, end));
        System.out.println(getContent(url2, storeIdPre, end));
        System.out.println("========================" + url2);

        System.out.println(getContent(url3, easyChannelIdPre, end));
        System.out.println(getContent(url3, storeIdPre, end));
        System.out.println("========================" + url3);

        String url4 = "/talk2Guide?guideId=1234&guiderLogo=httsdflkj&nick=5678";
        String guideIdPre = "guideId=";
        String guiderLogoPre = "guiderLogo=";
        String guiderNickPre = "nick=";
        String guideEnd = "&";
        System.out.println(getContent(url4, guideIdPre, guideEnd));
        System.out.println(getContent(url4, guiderLogoPre, guideEnd));
        System.out.println(getContent(url4, guiderNickPre, guideEnd));
        System.out.println("========================" + url4);
    }

    /**
     * 截取 pre和end之间的内容
     * @param url
     * @param pre
     * @param end
     * @return
     */
    private static String getContent(String url, String pre, String end){
        if (url.contains(pre)){
            url = url.substring(url.indexOf(pre));
            if (url.indexOf(end) > 0  && url.indexOf(end) > url.indexOf(pre)){
                return url.substring((url.indexOf(pre) + pre.length()), url.indexOf(end));
            } else {
                return url.substring((url.indexOf(pre) + pre.length()), url.length());
            }
        }
        return null;
    }
}

字符串的宽高

Rect rect=new Rect();
paint.getTextBounds(string, 0, string.length(), rect);

int strWidth=rect.width();
int strHeight=rect.height();