java：如何将文件转换为utf8
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java: how to convert a file to utf8
提问by Enrique San Martín
i have a file that have some non-utf8 caracters (like "ISO-8859-1"), and so i want to convert that file (or read) to UTF8 encoding, how i can do it?
我有一个包含一些非 utf8 字符的文件（如“ISO-8859-1”），所以我想将该文件（或读取）转换为 UTF8 编码，我该怎么做？
The code it's like this:
代码是这样的：
File file = new File("some_file_with_non_utf8_characters.txt");
/* some code to convert the file to an utf8 file */
...
edit: Put an encoding example
编辑：放一个编码示例
采纳答案by leonbloy
String charset = "ISO-8859-1"; // or what corresponds
BufferedReader in = new BufferedReader(
new InputStreamReader (new FileInputStream(file), charset));
String line;
while( (line = in.readLine()) != null) {
....
}
There you have the text decoded. You can write it, by the simmetric Writer/OutputStream methods, with the encoding you prefer (eg UTF-8).
在那里你已经解码了文本。您可以通过 simmetric Writer/OutputStream 方法使用您喜欢的编码（例如 UTF-8）编写它。
回答by Ismael
You only want to read it as UTF-8? What I did recently given a similar problem is to start the JVM with -Dfile.encoding=UTF-8, and reading/printing as normal. I don't know if that is applicable in your case.
您只想将其阅读为 UTF-8？我最近在遇到类似问题时所做的是使用 -Dfile.encoding=UTF-8 启动 JVM，并正常读取/打印。我不知道这是否适用于您的情况。
With that option:
使用该选项：
System.out.println("á é í ó ú")
prints correctly the characters. Otherwise it prints a ? symbol
正确打印字符。否则它会打印一个 ? 象征
回答by ZZ Coder
You need to know the encoding of the input file. For example, if the file is in Latin-1, you would do something like this,
您需要知道输入文件的编码。例如，如果文件是 Latin-1，你会做这样的事情，
FileInputStream fis = new FileInputStream("test.in");
InputStreamReader isr = new InputStreamReader(fis, "ISO-8859-1");
Reader in = new BufferedReader(isr);
FileOutputStream fos = new FileOutputStream("test.out");
OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");
Writer out = new BufferedWriter(osw);
int ch;
while ((ch = in.read()) > -1) {
out.write(ch);
}
out.close();
in.close();
回答by Eyal Schneider
The following code converts a file from srcEncoding to tgtEncoding:
以下代码将文件从 srcEncoding 转换为 tgtEncoding：
public static void transform(File source, String srcEncoding, File target, String tgtEncoding) throws IOException {
BufferedReader br = null;
BufferedWriter bw = null;
try{
br = new BufferedReader(new InputStreamReader(new FileInputStream(source),srcEncoding));
bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(target), tgtEncoding));
char[] buffer = new char[16384];
int read;
while ((read = br.read(buffer)) != -1)
bw.write(buffer, 0, read);
} finally {
try {
if (br != null)
br.close();
} finally {
if (bw != null)
bw.close();
}
}
}
--EDIT--
- 编辑 -
Using Try-with-resources (Java 7):
使用 Try-with-resources (Java 7)：
public static void transform(File source, String srcEncoding, File target, String tgtEncoding) throws IOException {
try (
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(source), srcEncoding));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(target), tgtEncoding)); ) {
char[] buffer = new char[16384];
int read;
while ((read = br.read(buffer)) != -1)
bw.write(buffer, 0, read);
}
}
