ReadFromFile.java

package testcase.T_sdcardRead_read_I_01;

import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.Reader;

public class ReadFromFile {

	/**
	 * 以字符为单位读取文件，常用于读文本，数字等类型的文件
	 */
	public static void readFileByChars(String fileName) {
		Reader reader = null;
		try {
			System.out.println("以字符为单位读取文件内容，一次读多个字节：");
			// 一次读多个字符  
			char[] tempchars = new char[30];
			int charread = 0;
			reader = new InputStreamReader(new FileInputStream(fileName));
			// 读入多个字符到字符数组中，charread为一次读取字符数
			while ((charread = reader.read(tempchars)) != -1) {
				// 同样屏蔽掉\r不显示
				if ((charread == tempchars.length) && (tempchars[tempchars.length - 1] != '\r')) {
					System.out.print(tempchars);
				} else {
					for (int i = 0; i < charread; i++) {
						if (tempchars[i] == '\r') {
							continue;
						} else {
							System.out.print(tempchars[i]);
						}
					}
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}