字节流转字符流OutputStreamWriter、InputStreamReader，关闭流的方法

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转换时可以指定编码格式：GBK、UTF-8

public class Demo {
public static void main(String[] args) {
File f = new File("word.txt");
FileOutputStream out = null;//字节流
OutputStreamWriter osw = null;//字节流转字符流
BufferedWriter bw = null;//缓冲字符流
try {
out = new FileOutputStream(f);
osw = new OutputStreamWriter(out, "GBK");//字节流转字符流，编码格式GBK
bw = new BufferedWriter(osw);
bw.write("夕西行");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {//注意关闭顺序，由后至前
if (bw != null) {
try {
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (osw != null) {
try {
osw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
FileInputStream in = null;//字节流
InputStreamReader isr = null;//字节流转字符流
BufferedReader br = null;//缓冲字符流
try {
in = new FileInputStream(f);
isr = new InputStreamReader(in, "GBK");
br = new BufferedReader(isr);
System.out.println(br.readLine());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (isr != null) {
try {
isr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}

关闭流的另外一种方法（推荐）。在try的（）中写入代码，try-catch结束，流自动关闭

public class Demo {
public static void main(String[] args) {
File f = new File("word.txt");
//在try的（）中写入代码，try-catch结束，流自动关闭
try (FileOutputStream out = new FileOutputStream(f);
OutputStreamWriter osw = new OutputStreamWriter(out, "GBK");
BufferedWriter bw = new BufferedWriter(osw);) {
bw.write("夕西行");
} catch (IOException e) {
e.printStackTrace();
}
FileInputStream in = null;//字节流
InputStreamReader isr = null;//字节流转字符流
BufferedReader br = null;//缓冲字符流
try {
in = new FileInputStream(f);
isr = new InputStreamReader(in, "GBK");
br = new BufferedReader(isr);
System.out.println(br.readLine());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (isr != null) {
try {
isr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}