lsm/hutool
1
0
Fork 0
mirror of https://gitee.com/dromara/hutool.git synced 2025-04-05 17:37:59 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

StrUtil增加truncateByByteLength方法

Browse Source
This commit is contained in:
Looly 2023-06-30 10:34:16 +08:00
parent a51d0e6bd7
commit 7e04a657a1
3 changed files with 10 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
CHANGELOG.md
View File

@ -10,6 +10,7 @@
* 【core 】 Ipv4Util 新增方法：检测指定 IP 地址是否匹配通配符（pr#3171@Github）
* 【core 】 DateUtil.parse适配6位毫秒格式（issue#I7H34N@Gitee）
* 【core 】 RandomUtil增加可选是否包含边界的重载（issue#3182@Github）
* 【core 】 StrUtil增加truncateByByteLength方法（pr#3176@Github）
### 🐞Bug修复
* 【core 】 修复MapUtil工具使用filter方法构造传入参数结果问题（issue#3162@Github）

26
hutool-core/src/main/java/cn/hutool/core/util/StrUtil.java
View File

@ -487,20 +487,6 @@ public class StrUtil extends CharSequenceUtil implements StrPool {
return truncateByByteLength(str, charset, maxBytes, 4, true);
}
/**
* 截断字符串，使用其按照GB18030编码为字节后不超过maxBytes长度。截断后自动追加省略号(...)
* 用于存储数据库varchar且编码为GB2312，GBK，GB18030的字段
*
* @param str
* @param maxBytes
* @return
*/
public static String truncateGb18030(String str, int maxBytes) {
Charset charset = Charset.forName("GB18030");
//GB18030编码单个字符最大长度2
return truncateByByteLength(str, charset, maxBytes, 2, true);
}
/**
* 截断字符串，使用其按照指定编码为字节后不超过maxBytes长度
*
@ -517,25 +503,25 @@ public class StrUtil extends CharSequenceUtil implements StrPool {
if (str == null || str.length() * factor <= maxBytes) {
return str;
}
byte[] sba = str.getBytes(charset);
final byte[] sba = str.getBytes(charset);
if (sba.length <= maxBytes) {
return str;
}
//限制字节数
int limitBytes;
final int limitBytes;
if (appendDots) {
limitBytes = maxBytes - "...".getBytes(charset).length;
} else {
limitBytes = maxBytes;
}
ByteBuffer bb = ByteBuffer.wrap(sba, 0, limitBytes);
CharBuffer cb = CharBuffer.allocate(limitBytes);
CharsetDecoder decoder = charset.newDecoder();
final ByteBuffer bb = ByteBuffer.wrap(sba, 0, limitBytes);
final CharBuffer cb = CharBuffer.allocate(limitBytes);
final CharsetDecoder decoder = charset.newDecoder();
//忽略被截断的字符
decoder.onMalformedInput(CodingErrorAction.IGNORE);
decoder.decode(bb, cb, true);
decoder.flush(cb);
String result = new String(cb.array(), 0, cb.position());
final String result = new String(cb.array(), 0, cb.position());
if (appendDots) {
return result + "...";
}

22
hutool-core/src/test/java/cn/hutool/core/util/StrUtilTest.java
View File

@ -652,7 +652,7 @@ public class StrUtilTest {
@Test
public void truncateUtf8Test() {
String str = "这是This一段中英文";
final String str = "这是This一段中英文";
String ret = StrUtil.truncateUtf8(str, 12);
Assert.assertEquals("这是Thi...", ret);
@ -666,26 +666,10 @@ public class StrUtilTest {
Assert.assertEquals(str, ret);
}
@Test
public void truncateGb18030Test() {
String str = "这是This一段中英文";
String ret = StrUtil.truncateGb18030(str, 12);
Assert.assertEquals("这是This...", ret);
ret = StrUtil.truncateGb18030(str, 13);
Assert.assertEquals("这是This一...", ret);
ret = StrUtil.truncateGb18030(str, 14);
Assert.assertEquals("这是This一...", ret);
ret = StrUtil.truncateGb18030(str, 999);
Assert.assertEquals(str, ret);
}
@Test
public void truncateByByteLengthTest() {
String str = "This is English";
String ret = StrUtil.truncateByByteLength(str, StandardCharsets.ISO_8859_1,10, 1, false);
final String str = "This is English";
final String ret = StrUtil.truncateByByteLength(str, StandardCharsets.ISO_8859_1,10, 1, false);
Assert.assertEquals("This is En", ret);
}
}