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Problem scenario
When building a code generation tool, you need to store the result of the corresponding code under src/test/resources and generate it according to the package path. Wherein the packet path is .replaced directory separator, test code as follows:
import java.io.File;
public class Test {
public static void main(String[] args){
String packageName = "com.test.aba";
String path = packageName.replaceAll("\\.", File.separator);
System.out.println(path);
}
}
Prompt to report an error, the error message is as follows:
Exception in thread "main" java.lang.IllegalArgumentException: character to be escaped is missing
at java.util.regex.Matcher.appendReplacement(Matcher.java:809)
at java.util.regex.Matcher.replaceAll(Matcher.java:955)
at java.lang.String.replaceAll(String.java:2223)
at com.gop.yy.api.web.Test.main(Test.java:15)
This blog is mainly about the solution to this problem.
Problem environment
| software | version |
|---|---|
| JDK | 1.8 |
problem causes
Under the windows platform, File.separatorthe value \is recognized as an escape character when it is replaced, so the parameter received by the ""method is , so the method reports an error.
solution
To \do the conversion, convert it to a non-escaped character. Here it is necessary to use Matcher.quoteReplacementa method, the method is defined as follows:
java.time.Matcher.quoteReplacement(String s)方法
返回指定String的文字替换String。
参数
s - 要文字化的字符串。
返回值
文字字符串替换。
result
The latest code is as follows:
import java.io.File;
public class Test {
public static void main(String[] args){
String packageName = "com.test.aba";
String path = packageName.replaceAll("\\.", Matcher.quoteReplacement(File.separator));
System.out.println(path);
}
}
No error is reported during operation.
to sum up
Think more.
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