Merge branch 'master' of https://gitee.com/y_project/RuoYi-Vue

疯狂的狮子li

2020-02-18 a1cf719d268a9d16db81ece94e75037c844f898f

 ruoyi/src/main/java/com/ruoyi/common/core/text/StrFormatter.java

¶Ô±ÈÐÂÎļþ
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package com.ruoyi.common.core.text;

import com.ruoyi.common.utils.StringUtils;

/**
 * å­—符串格式化
 * 
 * @author ruoyi
 */
public class StrFormatter
{
    public static final String EMPTY_JSON = "{}";
    public static final char C_BACKSLASH = '\\';
    public static final char C_DELIM_START = '{';
    public static final char C_DELIM_END = '}';

    /**
     * æ ¼å¼åŒ–字符串<br>
     * æ­¤æ–¹æ³•åªæ˜¯ç®€å•å°†å ä½ç¬¦ {} æŒ‰ç…§é¡ºåºæ›¿æ¢ä¸ºå‚æ•°<br>
     * å¦‚果想输出 {} ä½¿ç”¨ \\转义 { å³å¯ï¼Œå¦‚果想输出 {} ä¹‹å‰çš„ \ ä½¿ç”¨åŒè½¬ä¹‰ç¬¦ \\\\ å³å¯<br>
     * ä¾‹ï¼š<br>
     * é€šå¸¸ä½¿ç”¨ï¼šformat("this is {} for {}", "a", "b") -> this is a for b<br>
     * è½¬ä¹‰{}： format("this is \\{} for {}", "a", "b") -> this is \{} for a<br>
     * è½¬ä¹‰\： format("this is \\\\{} for {}", "a", "b") -> this is \a for b<br>
     * 
     * @param strPattern å­—符串模板
     * @param argArray å‚数列表
     * @return ç»“æžœ
     */
    public static String format(final String strPattern, final Object... argArray)
    {
        if (StringUtils.isEmpty(strPattern) || StringUtils.isEmpty(argArray))
        {
            return strPattern;
        }
        final int strPatternLength = strPattern.length();

        // åˆå§‹åŒ–定义好的长度以获得更好的性能
        StringBuilder sbuf = new StringBuilder(strPatternLength + 50);

        int handledPosition = 0;
        int delimIndex;// å ä½ç¬¦æ‰€åœ¨ä½ç½®
        for (int argIndex = 0; argIndex < argArray.length; argIndex++)
        {
            delimIndex = strPattern.indexOf(EMPTY_JSON, handledPosition);
            if (delimIndex == -1)
            {
                if (handledPosition == 0)
                {
                    return strPattern;
                }
                else
                { // å­—符串模板剩余部分不再包含占位符，加入剩余部分后返回结果
                    sbuf.append(strPattern, handledPosition, strPatternLength);
                    return sbuf.toString();
                }
            }
            else
            {
                if (delimIndex > 0 && strPattern.charAt(delimIndex - 1) == C_BACKSLASH)
                {
                    if (delimIndex > 1 && strPattern.charAt(delimIndex - 2) == C_BACKSLASH)
                    {
                        // è½¬ä¹‰ç¬¦ä¹‹å‰è¿˜æœ‰ä¸€ä¸ªè½¬ä¹‰ç¬¦ï¼Œå ä½ç¬¦ä¾æ—§æœ‰æ•ˆ
                        sbuf.append(strPattern, handledPosition, delimIndex - 1);
                        sbuf.append(Convert.utf8Str(argArray[argIndex]));
                        handledPosition = delimIndex + 2;
                    }
                    else
                    {
                        // å ä½ç¬¦è¢«è½¬ä¹‰
                        argIndex--;
                        sbuf.append(strPattern, handledPosition, delimIndex - 1);
                        sbuf.append(C_DELIM_START);
                        handledPosition = delimIndex + 1;
                    }
                }
                else
                {
                    // æ­£å¸¸å ä½ç¬¦
                    sbuf.append(strPattern, handledPosition, delimIndex);
                    sbuf.append(Convert.utf8Str(argArray[argIndex]));
                    handledPosition = delimIndex + 2;
                }
            }
        }
        // åŠ å…¥æœ€åŽä¸€ä¸ªå ä½ç¬¦åŽæ‰€æœ‰çš„字符
        sbuf.append(strPattern, handledPosition, strPattern.length());

        return sbuf.toString();
    }
}