79 lines
3.2 KiB
Java
79 lines
3.2 KiB
Java
package com.muyu.utils.text;
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import com.muyu.utils.StringUtils;
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/**
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* 字符串格式化
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*
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* @author muyu
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*/
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public class StrFormatter {
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public static final String EMPTY_JSON = "{}";
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public static final char C_BACKSLASH = '\\';
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public static final char C_DELIM_START = '{';
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public static final char C_DELIM_END = '}';
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/**
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* 格式化字符串<br>
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* 此方法只是简单将占位符 {} 按照顺序替换为参数<br>
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* 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>
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* 例：<br>
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* 通常使用：format("this is {} for {}", "a", "b") -> this is a for b<br>
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* 转义{}： format("this is \\{} for {}", "a", "b") -> this is \{} for a<br>
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* 转义\： format("this is \\\\{} for {}", "a", "b") -> this is \a for b<br>
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*
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* @param strPattern 字符串模板
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* @param argArray 参数列表
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*
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* @return 结果
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*/
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public static String format (final String strPattern, final Object... argArray) {
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if (StringUtils.isEmpty(strPattern) || StringUtils.isEmpty(argArray)) {
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return strPattern;
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}
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final int strPatternLength = strPattern.length();
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// 初始化定义好的长度以获得更好的性能
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StringBuilder sbuf = new StringBuilder(strPatternLength + 50);
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int handledPosition = 0;
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int delimIndex;// 占位符所在位置
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for (int argIndex = 0 ; argIndex < argArray.length ; argIndex++) {
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delimIndex = strPattern.indexOf(EMPTY_JSON, handledPosition);
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if (delimIndex == -1) {
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if (handledPosition == 0) {
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return strPattern;
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} else { // 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
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sbuf.append(strPattern, handledPosition, strPatternLength);
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return sbuf.toString();
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}
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} else {
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if (delimIndex > 0 && strPattern.charAt(delimIndex - 1) == C_BACKSLASH) {
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if (delimIndex > 1 && strPattern.charAt(delimIndex - 2) == C_BACKSLASH) {
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// 转义符之前还有一个转义符，占位符依旧有效
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sbuf.append(strPattern, handledPosition, delimIndex - 1);
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sbuf.append(Convert.utf8Str(argArray[argIndex]));
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handledPosition = delimIndex + 2;
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} else {
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// 占位符被转义
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argIndex--;
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sbuf.append(strPattern, handledPosition, delimIndex - 1);
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sbuf.append(C_DELIM_START);
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handledPosition = delimIndex + 1;
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}
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} else {
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// 正常占位符
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sbuf.append(strPattern, handledPosition, delimIndex);
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sbuf.append(Convert.utf8Str(argArray[argIndex]));
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handledPosition = delimIndex + 2;
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}
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}
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}
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// 加入最后一个占位符后所有的字符
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sbuf.append(strPattern, handledPosition, strPattern.length());
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return sbuf.toString();
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}
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}
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