关于java:字符串编码与解码字符流的编码与解码

编码：字符编码为字节byte[] getBytes()byte[] getBytes(String charsetName);解码：字节解码为字符String(byte[] b);String(byte[] b,String charsetName)

操作：
编码：留神输入的时候用类调用办法toString()

String s = "中国";byte[] by = s.getBytes();//byte[] by = s.getBytes(BGK)//byte[] by = s.getBytes(UTF-8)sout(Array.toString(by));

解码：留神解码和编码的形式要统一能力失去正确的字符串

String ss = String(by);//String sss = String(by,GBK)//String sss = String(by,UTF-8)sout(ss);

二、字符流的编码和解码

public abstract class Writerpublic abstract class Reader

.

public classs OutputStreamWriter extends Writerpublic class InputStreamReader extends Reader

构造函数：

OutputStreamWriter(OutputStream out)OutputStreamWriter(OutputStream out,String charsetName)InputStreamReader(InputStream in)InputStreamReader(InputStream in,String charsetName)

操作：
创建对象+写数据

OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("s.txt"));osw.write("中国");osw.close();

创建对象+读数据
读数据也有两种形式：一次读一个字符/一次读一个字符数组
形式一：

InputStreamReader isr = new InputStreamReader(new FileInputStream("E:\\sa\\s.txt"))int ch;while((ch=isr.read())!=-1){    Sout((char)ch);}isr.close();

形式二：

InputStreamReader isr = new InputStreamReader(new FileInputStream("E:\\sa\\s.txt"))char[] ch = new char[1024];int len;while ((len = isr.read(ch))!=-1){     Sout(String(ch,0,len));}isr.close();