InputStream类(java.io.InputStream)
public abstract class InputStream extends Object implements Closeable
构造方法:public InputStream()
普通方法:
public abstract int read()throws IOException |
依次读取单个字节数据,如果没有内容则返回-1 |
public int read(byte[] b) throws IOException |
读出输入流的数据,写入字节数组,返回实际读取到的长度,如果没有内容则返回-1 |
public int read(byte[] b, int off, int len) throws IOException |
读出输入流指定长度的数据,写入字节数组的指定位置,返回实际读取到的长度,如果没有内容则返回-1。但是当指定长度为0时返回0; |
public void close()throws IOException |
关闭数据流 |
FileInputStream(java.io.FileInputStream)
public class FileInputStream extends InputStream
构造方法:
public FileInputStream(File file) throws FileNotFoundException |
从文件创建输入流(File类) |
public FileInputStream(String name) throws FileNotFoundException |
从文件创建输入流(String类) |
实例:
test1.txt的内容 |
0123456789abcdefghijklmn |
Test2.txt的内容 |
01234 |
package wiki.jjcc.test.ips;
import java.io.File; import java.io.FileInputStream; import java.io.InputStream;
public public String s = File.separator; File file1 = new File("d:"+s+"temp"+s+"test1.txt"); File file2 = new File("d:"+s+"temp"+s+"test2.txt"); InputStream input = new FileInputStream(file1); byte[] b1 = new byte[] b2 = new int int System.out.println(num1); System.out.println("["+new String(b1)+"]"); System.out.println(num2); System.out.println("["+new String(b2)+"]"); input.close(); } } |
package wiki.jjcc.test.ips;
import java.io.File; import java.io.FileInputStream; import java.io.InputStream;
public public String s = File.separator; File file1 = new File("d:"+s+"temp"+s+"test1.txt"); File file2 = new File("d:"+s+"temp"+s+"test2.txt"); InputStream input = new FileInputStream(file2); byte[] b1 = new byte[] b2 = new int int System.out.println(num1); System.out.println("["+new String(b1)+"]"); System.out.println(num2); System.out.println("["+new String(b2)+"]"); input.close(); } } |
package wiki.jjcc.test.ips;
import java.io.File; import java.io.FileInputStream; import java.io.InputStream;
public public String s = File.separator; File file = new File("d:"+s+"temp"+s+"test1.txt"); InputStream input = new FileInputStream(file); byte[] b = new int int while((temp=input.read())!=-1){ b[foot++]=(byte)temp; } System.out.println(temp); System.out.println("["+new String(b)+"]"); input.close(); } } |