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解决FindBugs报错:Found reliance on default encoding in XXX

点滴 admin 2年前 (2017-09-05) 1106次浏览 已收录 0个评论 扫描二维码

I am getting below bug from FindBugs,

Found reliance on default encoding in MyClass.print(String): String.getBytes()

Method

protected void print (String str) {
{
private OutputStream outStream = null;
.....
outStream.write(str.getBytes());
.......
}

Please let me know what is the error? how we can resolve this?

Thanks in advance

There are different ways of encoding a String as bytes — the charset determines that encoding. If you don’t specify a charset, as in your call to str.getBytes(), it uses the system default.

FindBugs is warning you about this because you should think about what encoding you want to use for your output. If you’re writing to a file, what are the readers of that file expecting? It is safest if you can specify an explicit encoding for the file so you don’t write it one way and read it another way.

To specify an explicit charset, use str.getBytes(Charset.forName(“UTF-8”)), for example. UTF-8 is a good choice because it is always supported and can encode any character.

For example, .properties files are always ISO 8859-1 (i.e. Latin-1). That’s documented so there is no ambiguity around what encoding to use.

String.getBytes()依赖于系统编码,虽然方便,但是一旦使用就变成了一个技术债务,因为系统的默认编码是不可预知的

如果要避免这个错误,需要将编码指定好,即:

String.getBytes(“GBK”)

这是getBytes的一个重载方法,可以指定getBytes使用的编码

PS:常用编码中,笔者暂时只发现GBK编码中汉字占2个字节,其余均占3个字节

参考:

https://stackoverflow.com/questions/10347435/found-reliance-on-default-encoding

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