| 提交 | 用户 | 时间 | ||
| fd2207 | 1 | package com.jcdm.common.core.text; |
| 懒 | 2 | |
| 3 | import com.jcdm.common.utils.StringUtils; | |
| 4 | ||
| 5 | /** | |
| 6 | * 字符串格式化 | |
| 7 | * | |
| 8 | * @author jc | |
| 9 | */ | |
| 10 | public class StrFormatter | |
| 11 | { | |
| 12 | public static final String EMPTY_JSON = "{}"; | |
| 13 | public static final char C_BACKSLASH = '\\'; | |
| 14 | public static final char C_DELIM_START = '{'; | |
| 15 | public static final char C_DELIM_END = '}'; | |
| 16 | ||
| 17 | /** | |
| 18 | * 格式化字符串<br> | |
| 19 | * 此方法只是简单将占位符 {} 按照顺序替换为参数<br> | |
| 20 | * 如果想输出 {} 使用 \\转义 { 即可，如果想输出 {} 之前的 \ 使用双转义符 \\\\ 即可<br> | |
| 21 | * 例：<br> | |
| 22 | * 通常使用：format("this is {} for {}", "a", "b") -> this is a for b<br> | |
| 23 | * 转义{}： format("this is \\{} for {}", "a", "b") -> this is \{} for a<br> | |
| 24 | * 转义\： format("this is \\\\{} for {}", "a", "b") -> this is \a for b<br> | |
| 25 | * | |
| 26 | * @param strPattern 字符串模板 | |
| 27 | * @param argArray 参数列表 | |
| 28 | * @return 结果 | |
| 29 | */ | |
| 30 | public static String format(final String strPattern, final Object... argArray) | |
| 31 | { | |
| 32 | if (StringUtils.isEmpty(strPattern) || StringUtils.isEmpty(argArray)) | |
| 33 | { | |
| 34 | return strPattern; | |
| 35 | } | |
| 36 | final int strPatternLength = strPattern.length(); | |
| 37 | ||
| 38 | // 初始化定义好的长度以获得更好的性能 | |
| 39 | StringBuilder sbuf = new StringBuilder(strPatternLength + 50); | |
| 40 | ||
| 41 | int handledPosition = 0; | |
| 42 | int delimIndex;// 占位符所在位置 | |
| 43 | for (int argIndex = 0; argIndex < argArray.length; argIndex++) | |
| 44 | { | |
| 45 | delimIndex = strPattern.indexOf(EMPTY_JSON, handledPosition); | |
| 46 | if (delimIndex == -1) | |
| 47 | { | |
| 48 | if (handledPosition == 0) | |
| 49 | { | |
| 50 | return strPattern; | |
| 51 | } | |
| 52 | else | |
| 53 | { // 字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 | |
| 54 | sbuf.append(strPattern, handledPosition, strPatternLength); | |
| 55 | return sbuf.toString(); | |
| 56 | } | |
| 57 | } | |
| 58 | else | |
| 59 | { | |
| 60 | if (delimIndex > 0 && strPattern.charAt(delimIndex - 1) == C_BACKSLASH) | |
| 61 | { | |
| 62 | if (delimIndex > 1 && strPattern.charAt(delimIndex - 2) == C_BACKSLASH) | |
| 63 | { | |
| 64 | // 转义符之前还有一个转义符，占位符依旧有效 | |
| 65 | sbuf.append(strPattern, handledPosition, delimIndex - 1); | |
| 66 | sbuf.append(Convert.utf8Str(argArray[argIndex])); | |
| 67 | handledPosition = delimIndex + 2; | |
| 68 | } | |
| 69 | else | |
| 70 | { | |
| 71 | // 占位符被转义 | |
| 72 | argIndex--; | |
| 73 | sbuf.append(strPattern, handledPosition, delimIndex - 1); | |
| 74 | sbuf.append(C_DELIM_START); | |
| 75 | handledPosition = delimIndex + 1; | |
| 76 | } | |
| 77 | } | |
| 78 | else | |
| 79 | { | |
| 80 | // 正常占位符 | |
| 81 | sbuf.append(strPattern, handledPosition, delimIndex); | |
| 82 | sbuf.append(Convert.utf8Str(argArray[argIndex])); | |
| 83 | handledPosition = delimIndex + 2; | |
| 84 | } | |
| 85 | } | |
| 86 | } | |
| 87 | // 加入最后一个占位符后所有的字符 | |
| 88 | sbuf.append(strPattern, handledPosition, strPattern.length()); | |
| 89 | ||
| 90 | return sbuf.toString(); | |
| 91 | } | |
| 92 | } | |
