通过FileInputStream读取文件内容到字符串代码,Java代码库,德仔网

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【Java】通过FileInputStream读取文件内容到字符串

作者:首君 / 发布于2015/9/14/ 306

通过FileInputStream的read方法将文件内容逐个读取到StringBuffer中，最后输出StringBuffer的内容


	/*
	 Read file using FileInputStream
	 This example shows how to read a file using Java FileInputStream class.
	 FileInputStream is used to read binary content of the file and
	 return bytes of data.
	*/
	import java.io.*;
	
	public class ReadStringFromFile {
	
	 public static void main(String[] args) {
	
	 //create file object
	 File file = new File("C://FileIO//ReadString.txt");
	
	 int ch;
	 StringBuffer strContent = new StringBuffer("");
	 FileInputStream fin = null;
	
	 try
	 {
	 /*
	 * Create new FileInputStream object. Constructor of FileInputStream throws
	 * FileNotFoundException if the agrument File does not exist.
	 */
	
	 fin = new FileInputStream(file);
	
	 /*
	 * To read bytes from stream use,
	 * int read() method of FileInputStream class.
	 *
	 * This method reads a byte from stream. This method returns next byte of data
	 * from file or -1 if the end of the file is reached.
	 *
	 * Read method throws IOException in case of any IO errors.
	 */
	
	 while( (ch = fin.read()) != -1)
	 strContent.append((char)ch);
	
	 /*
	 * To close the FileInputStream, use
	 * void close() method of FileInputStream class.
	 *
	 * close method also throws IOException.
	 */
	 fin.close();
	
	 }
	 catch(FileNotFoundException e)
	 {
	 System.out.println("File " + file.getAbsolutePath() +
	 " could not be found on filesystem");
	 }
	 catch(IOException ioe)
	 {
	 System.out.println("Exception while reading the file" + ioe);
	 }
	
	 System.out.println("File contents :");
	 System.out.println(strContent);
	
	
	 /*
	 * Please note that, FileInputStream SHOULD NOT BE USED to read
	 * character data file.
	 * It is meant for reading binary data such as an image file.
	 *
	 * To read character data, FileReader should be used.
	 */
	 }
	}
	
	/*
	Output would be
	File contents :
	This file is a demonstration of how to read a file using Java FileInputStream.
	*/

试试其它关键字

　FileInputStream　

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