JAVA IO流相关代码(InputStreamReader类OutputStreamWriter类DataInputStream类DataOutputStream类)
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与编码相关的InputStreamReader类和OutputStreamWriter类
示例代码
import java.io.*;
class EncodeStream
public static void main(String[] args) throws IOException
//writeText();
readText();
public static void readText()throws IOException
InputStreamReader isr = new InputStreamReader(new FileInputStream("utf.txt"),"gbk");
char[] buf = new char[10];
int len = isr.read(buf);
String str = new String(buf,0,len);
System.out.println(str);
isr.close();
public static void writeText()throws IOException
OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("utf.txt"),"UTF-8");
osw.write("你好");
osw.close();
与字符串编码解码相关的代码
示例代码
import java.util.*;
class EncodeDemo
public static void main(String[] args)throws Exception
String s = "哈哈";
byte[] b1 = s.getBytes("GBK");
System.out.println(Arrays.toString(b1));
String s1 = new String(b1,"utf-8");
System.out.println("s1="+s1);
//对s1进行iso8859-1编码。
byte[] b2 = s1.getBytes("utf-8");
System.out.println(Arrays.toString(b2));
String s2 = new String(b2,"gbk");
System.out.println("s2="+s2);
DataInputStream与DataOutputStream
可以用于操作基本数据类型的数据的流对象。
示例代码
import java.io.*;
class DataStreamDemo
public static void main(String[] args) throws IOException
//writeData();
//readData();
//writeUTFDemo();
// OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("gbk.txt"),"gbk");
//
// osw.write("你好");
// osw.close();
// readUTFDemo();
public static void readUTFDemo()throws IOException
DataInputStream dis = new DataInputStream(new FileInputStream("utf.txt"));
String s = dis.readUTF();
System.out.println(s);
dis.close();
public static void writeUTFDemo()throws IOException
DataOutputStream dos = new DataOutputStream(new FileOutputStream("utfdate.txt"));
dos.writeUTF("你好");
dos.close();
public static void readData()throws IOException
DataInputStream dis = new DataInputStream(new FileInputStream("data.txt"));
int num = dis.readInt();
boolean b = dis.readBoolean();
double d = dis.readDouble();
System.out.println("num="+num);
System.out.println("b="+b);
System.out.println("d="+d);
dis.close();
public static void writeData()throws IOException
DataOutputStream dos = new DataOutputStream(new FileOutputStream("data.txt"));
dos.writeInt(234);
dos.writeBoolean(true);
dos.writeDouble(9887.543);
dos.close();
ObjectOutputStream oos = null;
oos.writeObject(new O());
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