代码演示

1. maven 依赖：

<!-- https://mvnrepository.com/artifact/commons-lang/commons-lang -->
<dependency>
    <groupId>commons-lang</groupId>
    <artifactId>commons-lang</artifactId>
    <version>2.6</version>
</dependency>

2. 案例代码：

import org.apache.commons.lang.StringEscapeUtils;

public class Demo {
    public static void main(String[] args) {
        String a = "hello \\r\\n world";
        System.out.println(a);
        System.out.println(StringEscapeUtils.unescapeJava(a));
    }
}

3. 输出结果：

hello \r\n world
hello 
 world

参考

• https://blog.csdn.net/joshuaxx316/article/details/47760785/