Java InputStreamReader read()方法

java.io.InputStreamReader.read() 方法读取并返回一个单个字符。

1 语法

public int read()

2 参数

无

3 返回值

该方法返回读取的字符，如果已到达流的末尾，则返回-1。

4 示例 

package com.yiidian;

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

public class Demo {
    public static void main(String[] args) throws IOException {
        FileInputStream fis = null;
        InputStreamReader isr = null;
        char c;
        int i;

        try {
            // new input stream reader is created
            fis = new FileInputStream("d:/test.txt");
            isr = new InputStreamReader(fis);

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

                // int to character
                c = (char)i;

                // print char
                System.out.println("Character Read: "+c);
            }

        } catch (Exception e) {
            // print error
            e.printStackTrace();
        } finally {
            // closes the stream and releases resources associated
            if(fis!=null)
                fis.close();
            if(isr!=null)
                isr.close();
        }
    }
}

假设test.txt内容如下：

ABCDE

输出结果为：

Character Read: A
Character Read: B
Character Read: C
Character Read: D
Character Read: E