替换具有反斜杠的变量

Question

代码的目的是用配置文件的另一个值替换值。

旧值赋给一个变量oldValue="serverip=http://82.347.34.12"

新值赋给另一个变量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 取一个 Regular Expression。您将不得不转义正则表达式特殊字符（例如斜杠）或使用 String.replace，它不采用正则表达式。

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