/** * 检查文件中是否为一个空 * @param filePath * @param fileName * @return 为空返回true * @throws IOException */ public boolean fileIsNull(String filePath,String fileName) throws IOException { boolean result = false; FileReader fr = new FileReader(filePath+fileName); if(fr.read() == -1) { result = true; System.out.println(fileName+" 文件中没有数据!"); } else { System.out.println(fileName+" 文件中有数据!"); } fr.close(); return result; } /** * 读取文件中的所有内容 * @param filePath * @param fileName * @throws IOException */ public void readAllFile(String filePath,String fileName) throws IOException { FileReader fr = new FileReader(filePath+fileName); int count = fr.read(); while(count != -1) { System.out.print((char)count); count = fr.read(); if(count == 13) { fr.skip(1); } } fr.close(); } /** * 一行一行的读取文件中的数据 * @param filePath * @param fileName * @throws IOException */ public void readLineFile(String filePath,String fileName) throws IOException { FileReader fr = new FileReader(filePath+fileName); BufferedReader br = new BufferedReader(fr); String line = br.readLine(); while(line != null) { System.out.println(line); line = br.readLine(); } br.close(); fr.close(); } } |
到这里Java输入数据流就介绍完了
