Java Java类设置 2
Java Java类设置 1
更多方法：
- byte readByte() ：读取并返回一个输入字节。
Syntax:public final byte readByte() throws IOException Returns: the next byte of this input stream as a signed 8-bit byte. Throws: EOFException IOException - float readFloat() ：读取四个输入字节并返回一个浮点值。
Syntax:public final float readFloat() throws IOException Returns :the next four bytes of this input stream, interpreted as a float. Throws: EOFException IOException - void readFully(byte[] b) ：从输入流中读取一些字节并将它们存储到缓冲区数组 b 中。
Syntax:public final void readFully(byte[] b) throws IOException Parameters: b - the buffer into which the data is read. Throws: EOFException IOException - void readFully(byte[] b, int off, int len) ：从输入流中读取 len 个字节。
Syntax:public final void readFully(byte[] b, int off, int len) throws IOException Parameters: b - the buffer into which the data is read. off - the start offset of the data. len - the number of bytes to read. Throws: EOFException IOException - String readLine() ：从输入流中读取下一行文本。
Syntax: Returns: the next line of text from this input stream. Throws: IOException Deprecated This method does not properly convert bytes to characters. - long readLong() ：读取八个输入字节并返回一个 long 值。
Syntax:public final long readLong() throws IOException Returns: the next eight bytes of this input stream, interpreted as a long. Throws: EOFException IOException - short readShort() ：读取两个输入字节并返回一个短值。
Syntax:public final short readShort() throws IOException Returns: the next two bytes of this input stream, interpreted as a signed 16-bit number. Throws: EOFException IOException - String readUTF() ：读取已使用修改后的 UTF-8 格式编码的字符串。
Syntax:public final String readUTF() throws IOException Returns: a Unicode string. Throws: EOFException IOException UTFDataFormatException - int skipBytes(int n) ：尝试从输入流中跳过 n 个字节的数据，丢弃跳过的字节。
Syntax:public final int skipBytes(int n) throws IOException Parameters: n - the number of bytes to be skipped. Returns: the actual number of bytes skipped. Throws: IOException
方案二：
//Java program to demonstrate DataInputStream
// This program uses try-with-resources. It requires JDK 7 or later.
import java.io.*;
import java.lang.reflect.Array;
import java.util.Arrays;
class DataInputStreamDemo
{
public static void main(String args[]) throws IOException
{
//writing the data.
try ( DataOutputStream dout =
new DataOutputStream(new FileOutputStream("file.dat")) )
{
dout.writeBytes("1");
dout.writeFloat(4.4545f);
dout.writeUTF("geeksforgeeks");
dout.writeChars("GeeksforGeeks\n");
dout.writeBytes("ABCDEFG");
}
catch(FileNotFoundException ex)
{
System.out.println("Cannot Open the Output File");
return;
}
// reading the data back.
try ( DataInputStream din =
new DataInputStream(new FileInputStream("file.dat")) )
{
//illustrating readByte() method
byte t=din.readByte();
//illustrating readFloat() method
float u=din.readFloat();
//illustrating readUTF() method
String temp=din.readUTF();
//illustrating readLine() method
String temp1=din.readLine();
System.out.println("Values: " + t +" "+" "+u+" "+temp+" "+temp1 );
//illustrating skipBytes() method
//skipping "AB"
din.skipBytes(2);
//illustrating readFully() method
byte[] b=new byte[4];
din.readFully(b,0,4);
System.out.println(Arrays.toString(b));
}
catch(FileNotFoundException e)
{
System.out.println("Cannot Open the Input File");
return;
}
}
}
输出：
Values: 49 4.4545 geeksforgeeks GeeksforGeeks
[67, 68, 69, 70]