java Printwriter 和 OutputStream 有什么区别
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/6883715/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
What's the difference between Printwriter and OutputStream
提问by rena-c
First,we have PrintWriter
首先，我们有 PrintWriter
java.io.File f=new java.io.File("s.txt");
java.io.PrintWriter out=new java.io.PrintWriter(f);
out.print(5);
out.print(7);
out.close();
Then we have outputstream
然后我们有输出流
java.io.File f=new java.io.File("s.txt");
java.io.FileOutputStream out=new java.io.FileOutputStream(f);
out.write(5);
out.write(7);
out.close();
Whats the difference?
有什么不同？
回答by Jon Skeet
OutputStreamsare meant for binarydata. Writers (including PrintWriter) are meant for textdata.
OutputStreams用于二进制数据。Writers（包括PrintWriter）用于文本数据。
You may not see the difference in your specific situation as you're calling PrintWriter.write(int)which writes a single character - if the character encoding you're using just maps characters to the same byte, for characters less than 127, then you'll see the same result. But if you give it a different encoding, thenyou'll see a difference.
当您调用PrintWriter.write(int)它写入单个字符时，您可能看不到具体情况的差异- 如果您使用的字符编码只是将字符映射到相同的字节，对于小于 127 的字符，那么您会看到相同的结果。但是如果你给它一个不同的编码，那么你会看到不同。
PrintWriteris also different in that it suppresses IO exceptions - as does PrintStream, which is the binary stream equivalent of PrintWriter.
PrintWriter不同之处还在于它抑制 IO 异常 - 也是如此PrintStream，它是PrintWriter.
回答by Christian Vielma
From this java2novice.com linkI extracted the following, that is similar to what Jon said:
我从这个java2novice.com 链接中提取了以下内容，这类似于 Jon 所说的：
ServletOutputStream:ServletResponse.getOutputStream() returnsa ServletOutputStreamsuitable for writing binary data in the response. The servlet
container does not encode the binary data, it sends the raw data
as it is.
ServletOutputStream：ServletResponse.getOutputStream() returns一个ServletOutputStream适合在响应中写入二进制数据。servlet 容器不对二进制数据进行编码，而是按原样发送原始数据。
PrintWriter:ServletResponse.getWriter()returns PrintWriterobject which sends
character text to the client. The PrintWriteruses the character
encoding returned by getCharacterEncoding(). If the response's
character encoding has not been specified then it does default
character encoding.
PrintWriter：ServletResponse.getWriter()返回PrintWriter向客户端发送字符文本的对象。在PrintWriter使用由返回的字符编码getCharacterEncoding()。如果未指定响应的字符编码，则它执行默认字符编码。
