问题描述
DataOutputStream 中的 writeBytes(str)与 write(str)有什么区别?并有使用它们的提示/技巧吗?预先感谢.
What's the difference between writeBytes(str) vs write(str) in DataOutputStream?And is there any Tips/Tricks to use them?Thanks in advance.
推荐答案
DataOutputStream属于用于写入二进制数据的OutputStream类-不是用于文本的Writer，它是旧类，并且是 writeBytes(String)是一个奇怪的twitter方法:
DataOutputStream belongs to the OutputStream classes for writing binary data - not Writer for text, It is an old class and writeBytes(String) is a weird twitter method as it:
因此，从每个Unicode UTF-16字符(16位)中提取低字节.如果字符串限制为7位ASCII(可能是ISO-8859-1)，则该字符串不整齐.但总的来说，信息会丢失.
So from every Unicode UTF-16 char (16 bits) the low byte is taken. If the string restricted to 7-bits ASCII, maybe a bit ISO-8859-1, the string is not mangled. But in general information is lost.
DataInputStream中没有对应项，没有 String readBytes().
There is no counterpart in DataInputStream, no String readBytes().
我称它为设计事故，因为Java引入了文本和二进制数据( byte [] )的分离，引入了 byte 并保留了 String 和16位 char (用于Unicode文本).作者可能觉得需要C风格的 write(char *).
I would call it a design mishap, as java introduced a separatation from text and binary data (byte[]), introducing byte and reserving String and 16-bit char for Unicode text. The author probably felt a need for a C style write(char*).
无需提及writeUTF和DataInputStream.readUTF.
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