Java FilterInputStream read()方法

java.io.FilterInputStream.read() 用于从输入流中读取下一个数据字节。

1 语法

public int read()

2 参数

无

3 返回值

该方法返回数据的下一个字节，如果到达流的末尾，则返回-1。

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.io.FilterInputStream.read()方法的例子
 */
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

public class Demo {
    public static void main(String[] args) throws Exception {
        InputStream is = null;
        FilterInputStream fis = null;
        int i = 0;
        char c;

        try {
            // create input streams
            is = new FileInputStream("d://test.txt");
            fis = new BufferedInputStream(is);

            // read till the end of the stream
            while((i = fis.read())!=-1) {

                // converts integer to character
                c = (char)i;

                // prints
                System.out.println("Character read: "+c);
            }

        } catch(IOException e) {
            // if any I/O error occurs
            e.printStackTrace();
        } finally {
            // releases any system resources associated with the stream
            if(is!=null)
                is.close();
            if(fis!=null)
                fis.close();
        }
    }
}

假设test.txt内容如下：

Character read: A
Character read: B
Character read: C
Character read: D
Character read: E
Character read: F

输出结果为：

Character read: A
Character read: B
Character read: C
Character read: D
Character read: E
Character read: F