Java中的反斜杠 [英] Backslash in java

问题描述

我对保存在数据库中的字符串有问题，例如:"311 \ 315_316 \ 336_337" .它们只有一个反斜杠，这在Java中是一个问题.当我尝试 s.replaceAll("\"，"\\")时不起作用，因为Java编译器读取字符串"311 \ 315_316 \ 336_337" 作为311Í_316Þ_337" .

I have a problem with strings saved in a database, like this for example: "311\315_316\336_337". They have only one backslash and this is a problem in java. When I try to s.replaceAll("\", "\\") it doesn't work because the java compiler reads the string "311\315_316\336_337" as "311Í_316Þ_337".

我也尝试编码和解码编码"311％C3％8D_316％C3％9E_337" 的结果，但是解码结果仍然是311Í_316Þ_337" ?

I also try encoding and decoding the result of encoding "311%C3%8D_316%C3%9E_337" but the result of decoding is still "311Í_316Þ_337"?

如何解决一个反斜杠的问题?

How can I solve problem of one backslash?

我想将此字符串传递给函数以执行拆分数字的过程，而反斜杠是分隔符，但是此问题使我无法这样做.

I want to pass this string to function to do a process which splits numbers and the backslash is the delimiter, but this problem prevents me from doing that.

推荐答案

数据库中的数据正常，您无需替换任何内容.直接用Java代码编写的字符串 literals 必须使它们的反斜杠被另一个反斜杠转义:

The data in the database is OK, and you don't have to replace anything. String literals, written directly in the Java code, must have their backslash escaped by another backslash:

String s = "311\\315_316\\336_337";
System.out.println(s); // prints 311\315_316\336_337

但是，如果您从数据库中获得了这些值，那么您就无事可做:

But if you get those values from the database, you don't have anything to do:

String s = resultSet.getString(1);
System.out.println(s); // should print 311\315_316\336_337

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