java - 替换带有反斜杠的变量

Question

代码的目的是将配置文件的值替换为另一个值。

旧值分配给变量oldValue="serverip=http://82.347.34.12"

新值被分配给另一个变量newValue="serverip=http://99.347.34.12"

void searchFile(File nameOfFile, String oldValue, String newValue) throws IOException {
    try {

                System.out.println("Old setting: " + lines); // returns -> serverip=http:\/\/82.347.34.12
                System.out.println("New setting: " + settingToApply); // returns --> serverip=http:\/\/99.347.34.12

                Path path = Paths.get(SETTINGS);
                Charset charset = StandardCharsets.UTF_8;

                String content = new String(Files.readAllBytes(path), charset);

                // changes any cases correctly except when value have \
                content = content.replaceAll(oldValue, newValue); 
                Files.write(path, content.getBytes(charset));

        }

        scanner.close();
    } catch (FileNotFoundException e) {
        // handle this
    }
}

}

谢谢。

Answer 1

String.replaceAll 采用 Regular Expression 。您必须转义正则表达式特殊字符(例如斜杠)或使用 String.replace，它不需要正则表达式。