java 将字节数组或 strinbuilder 转换为 utf-8
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Convert byte array or strinbuilder to utf-8
提问by Henrik
i want to convert the content to utf-8 charset before i return the string in following method:
我想在使用以下方法返回字符串之前将内容转换为 utf-8 字符集：
public static String getContentResult(URL url) throws IOException{
InputStream in = url.openStream();
StringBuilder sb = new StringBuilder();
byte [] buffer = new byte[4096];
while(true){
int byteRead = in.read(buffer);
if(byteRead == -1)
break;
for(int i = 0; i < byteRead; i++){
sb.append((char)buffer[i]);
}
}
in.close();
return sb.toString();
}
How can i do that?
我怎样才能做到这一点？
Thanks!
谢谢！
回答by Jon Skeet
You don't want to convert toUTF-8. You want (I believe) to interpret the incoming stream of data asUTF-8.
您不想转换为UTF-8。您希望（我相信）将传入的数据流解释为UTF-8。
Options:
选项：
Create an
InputStreamReaderwrapping your incoming stream, specifying UTF-8, and read blocks of charactersat a time, appending to aStringBuilderStringBuilder builder = new StringBuilder(); char[] buffer = new char[4096]; InputStreamReader reader = new InputStreamReader(in, "UTF-8"); int charsRead; while ((charsRead = reader.read(buffer)) != -1) { builder.append(buffer, 0, charsRead); }Use Guavato read the whole data as a byte array, then convert it in one go:
byte[] data = BytesStreams.toByteArray(in); return new String(data, Charsets.UTF_8);
创建一个
InputStreamReader包装您的传入流，指定 UTF-8，并一次读取字符块，附加到StringBuilderStringBuilder builder = new StringBuilder(); char[] buffer = new char[4096]; InputStreamReader reader = new InputStreamReader(in, "UTF-8"); int charsRead; while ((charsRead = reader.read(buffer)) != -1) { builder.append(buffer, 0, charsRead); }使用Guava将整个数据读取为字节数组，然后一口气转换：
byte[] data = BytesStreams.toByteArray(in); return new String(data, Charsets.UTF_8);
In either case, you should use a finallyblock to close the stream, so that you close it even if an exception is thrown.
在任何一种情况下，您都应该使用finally块来关闭流，这样即使抛出异常也可以关闭它。
回答by Harish Raj
Convert from String to byte[]:
从字符串转换为字节[]：
String s = "some text here";
byte[] b = s.getBytes("UTF-8");
Convert from byte[] to String:
从字节 [] 转换为字符串：
byte[] b = {(byte) 99, (byte)97, (byte)116};
String s = new String(b, "US-ASCII");
回答by Captain Fantastic
if you want to add the actual byte value don't use "US-ASCII" just leave that parameter off:
如果要添加实际字节值，请不要使用“US-ASCII”，只需关闭该参数即可：
byte[] abcd={'A','B','C','D',13,10,'E','F',(byte)255,'G','H',13,10,'J','K',0,'L','M'};
String s = new String(abcd);
StringBuilder sabcd=new StringBuilder();
sabcd.append(s);
System.out.println(sabcd);
for(int i=0;i<sabcd.length();i++) {
char c=sabcd.charAt(i);
System.out.println((int)c);
}
Result:
结果：
ABCD
EF?GH
JK
65
66
67
68
13
10
69
70
255
71
72
13
10
74
75
0
76
77
