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fix: 修改flexibleConcat方法

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This commit is contained in:
Xjf 2025-02-05 11:53:42 +08:00
parent 1776471134
commit 33d669e94e
2 changed files with 29 additions and 4 deletions
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17
hutool-core/src/main/java/org/dromara/hutool/core/text/StrUtil.java
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@ -383,8 +383,14 @@ public class StrUtil extends CharSequenceUtil implements StrPool {
* @return flexibleConcat * @return flexibleConcat
*/ */
public static String flexibleConcat(String str, String left, String right, String middle, int middlePos) { public static String flexibleConcat(String str, String left, String right, String middle, int middlePos) {
// 预计算最终字符串的长度，避免 StringBuilder 反复扩容
int estimatedLength = (str != null ? str.length() : 0) +
(left != null ? left.length() : 0) +
(right != null ? right.length() : 0) +
(middle != null ? middle.length() : 0);
// 使用 StringBuilder 来提高拼接性能 // 使用 StringBuilder 来提高拼接性能
StringBuilder sb = new StringBuilder(); StringBuilder sb = new StringBuilder(estimatedLength);
// 如果原始字符串不为 null，添加到 StringBuilder // 如果原始字符串不为 null，添加到 StringBuilder
if (str != null) { if (str != null) {
@ -394,18 +400,21 @@ public class StrUtil extends CharSequenceUtil implements StrPool {
// 左边拼接字符串（如果有 // 左边拼接字符串（如果有
Optional.ofNullable(left) Optional.ofNullable(left)
.filter(s -> !s.isEmpty()) .filter(s -> !s.isEmpty())
.ifPresent(l -> sb.insert(0, l.toCharArray())); .ifPresent(l -> sb.insert(0, l));
// 右边拼接字符串（如果有） // 右边拼接字符串（如果有）
Optional.ofNullable(right) Optional.ofNullable(right)
.filter(s -> !s.isEmpty()) .filter(s -> !s.isEmpty())
.ifPresent(sb::append); .ifPresent(sb::append);
// 计算 middle 的插入位置
int adjustedMiddlePos = (left != null ? left.length() : 0) + middlePos;
// 中间拼接字符串（如果有且位置有效） // 中间拼接字符串（如果有且位置有效）
Optional.ofNullable(middle) Optional.ofNullable(middle)
.filter(s -> !s.isEmpty()) .filter(s -> !s.isEmpty())
.filter(s -> middlePos >= 0 && middlePos <= sb.length()) .filter(s -> adjustedMiddlePos >= 0 && adjustedMiddlePos <= sb.length())
.ifPresent(m -> sb.insert(middlePos, m.toCharArray())); .ifPresent(m -> sb.insert(adjustedMiddlePos, m));
return sb.toString(); return sb.toString();
} }

16
hutool-core/src/test/java/org/dromara/hutool/core/text/StrUtilTest.java
View File

@ -641,4 +641,20 @@ public class StrUtilTest {
final String s = StrUtil.indexedFormat("a{0,number,#}", 1234567); final String s = StrUtil.indexedFormat("a{0,number,#}", 1234567);
Assertions.assertEquals("a1234567", s); Assertions.assertEquals("a1234567", s);
} }
@Test
public void flexibleConcat() {
/**
* 往左边填充
*/
System.out.println(StrUtil.flexibleConcat("hello", ">>>", null, null, -1));
/**
* 往右边填充
*/
System.out.println(StrUtil.flexibleConcat("java", null, "!", null, -1));
/**
* 往左右中间填充
*/
System.out.println(StrUtil.flexibleConcat("world", "abc", "xyz", "123", 3));
}
} }