????InputStream?OutputStream????????????

1. ??????

????????????????????????????????????????????????????????????????????

2. InputStreamReader???

InputStreamReader?Java?????????????????InputStream??????????Reader??????????????FileInputStream????InputStreamReader????????????

?????

import java.io.FileInputStream;import java.io.InputStreamReader;public class InputStreamReaderTest {    public static void main(String[] args) throws Exception {        // ??UTF-8???????        FileInputStream fis = new FileInputStream("message.txt");        InputStreamReader isr = new InputStreamReader(fis, "UTF-8");        char[] buffer = new char[1024];        int len;        while ((len = isr.read(buffer)) != -1) {            String str = new String(buffer, 0, len);            System.out.println(str);        }        isr.close();        fis.close();    }}

3. OutputStreamWriter???

OutputStreamWriter????????????Writer??????????OutputStream?????????????????????????

?????

import java.io.FileOutputStream;import java.io OutputStreamWriter;public class OutputStreamWriterTest {    public static void main(String[] args) throws Exception {        // ?GBK??????????        FileOutputStream fos = new FileOutputStream("message_gbk.txt");        OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK");        String content = "??GBK??";        osw.write(content.getBytes());        osw.close();        fos.close();    }}

4. ?????

???????????????????????????????????????????????????

ASCII????????????????8??????256???????

ISO-8859-1?????????????8????256????

GB2312?????????????????????????

GBK?GB2312???????????????????????

Unicode????????????????????

UTF-8???????????????????????????

5. ??????????

??????????????????

??????????????????????????????????????

????????????????????????

6. ??????

???????????????????????????????????????

import java.io.FileInputStream;import java.io.FileOutputStream;import java.io InputStreamReader;import java.io OutputStreamWriter;public class FileConvertTest {    public static void main(String[] args) throws Exception {        // ??UTF-8?????        FileInputStream fis = new FileInputStream("message.txt");        InputStreamReader isr = new InputStreamReader(fis, "UTF-8");        char[] buffer = new char[1024];        int len;        while ((len = isr.read(buffer)) != -1) {            System.out.println(new String(buffer, 0, len));        }        isr.close();        fis.close();        // ?????????GBK?????        FileOutputStream fos = new FileOutputStream("message_gbk.txt");        OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK");        osw.write("message".getBytes());        osw.close();        fos.close();    }}

7. ????

???????IOException?????????????????try-catch-finally?????????????

public class SafeIO {    public static void main(String[] args) throws Exception {        try {            // ????            FileInputStream fis = new FileInputStream("file.txt");            InputStreamReader isr = new InputStreamReader(fis, "UTF-8");            char[] buffer = new char[1024];            while ((len = isr.read(buffer)) != -1) {                System.out.println(new String(buffer, 0, len));            }            isr.close();            fis.close();            // ????            FileOutputStream fos = new FileOutputStream("new_file.txt");            OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK");            osw.write("?????".getBytes());            osw.close();            fos.close();        } catch (IOException e) {            e.printStackTrace();        }    }}