错误示范
本示例说明如何在不指定年份的情况下解析日期，如下：
代码语言：javascript复制
package com.fun
import com.fun.frame.SourceCode
import java.time.LocalDate
import java.time.format.DateTimeFormatter
class TSSS extends SourceCode {
public static void main(String[] args) {
public static void main(String[] args) {
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd MMM", Locale.CHINA);
String date = "02 12";
LocalDate localDate = LocalDate.parse(date, formatter);
System.out.println(localDate);
System.out.println(formatter.format(localDate));
}
}
}
输出
代码语言：javascript复制INFO-> 当前用户：fv，IP：192.168.0.100，工作目录：/Users/fv/Documents/workspace/fun/,系统编码格式:UTF-8,系统Mac OS X版本:10.15.3
Exception in thread "main" java.time.format.DateTimeParseException: Text '02 12' could not be parsed at index 3
at java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1947)
at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1849)
at java.time.LocalDate.parse(LocalDate.java:400)
at java_time_LocalDate$parse.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:115)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:135)
at com.fun.TSSS.main(TSSS.groovy:16)
Process finished with exit code 1
正解
模式dd MMM还不够；我们需要DateTimeFormatterBuilder为日期解析提供默认年份。
package com.fun
import com.fun.frame.SourceCode
import java.time.LocalDate
import java.time.format.DateTimeFormatter
import java.time.format.DateTimeFormatterBuilder
import java.time.temporal.ChronoField
class TSSS extends SourceCode {
public static void main(String[] args) {
DateTimeFormatter formatter = new DateTimeFormatterBuilder()
.appendPattern("dd MM")
.parseDefaulting(ChronoField.YEAR, 2020)
.toFormatter(Locale.CHINA);
String date = "02 11";
LocalDate localDate = LocalDate.parse(date, formatter);
System.out.println(localDate);
System.out.println(formatter.format(localDate));
}
}
输出
代码语言：javascript复制INFO-> 当前用户：fv，IP：192.168.0.100，工作目录：/Users/fv/Documents/workspace/fun/,系统编码格式:UTF-8,系统Mac OS X版本:10.15.3
2020-11-02
02 11
Process finished with exit code 0
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