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【
Java
】
文件读写操作工具类
作者:
Gooogle
/ 发布于
2012/3/6
/
845
<div>package util;</div> <div></div> import java.io.BufferedReader;</div> import java.io.File;</div> import java.io.FileInputStream;</div> import java.io.FileReader;</div> import java.io.FileWriter;</div> import java.io.IOException;</div> import java.io.InputStream;</div> import java.io.InputStreamReader;</div> import java.io.RandomAccessFile;</div> import java.io.Reader;</div> <div></div> <div>/**</div> <div>*</div> <div>* @类名: FileUtil</div> <div>* @作用: TODO</div> <div>* @日期: 2012-3-1 下午04:58:31</div> <div>*/</div> <div></div> <div>public class FileUtil {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>/**</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * 以字节为单位读取文件，常用于读二进制文件，如图片、声音、影像等文件。</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * @param fileName 文件的名</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> */</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>public static void readFileByBytes(String fileName) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>File file = new File(fileName);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>InputStream in = null;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println("以字节为单位读取文件内容，一次读一个字节：");</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 一次读一个字节</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>in = new FileInputStream(file);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>int tempbyte;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>while ((tempbyte = in.read()) != -1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.write(tempbyte);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>in.close();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (IOException e) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>e.printStackTrace();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>return;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println("以字节为单位读取文件内容，一次读多个字节：");</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 一次读多个字节</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>byte[] tempbytes = new byte[100];</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>int byteread = 0;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>in = new FileInputStream(fileName);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>FileUtil.showAvailableBytes(in);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 读入多个字节到字节数组中，byteread为一次读入的字节数</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>while ((byteread = in.read(tempbytes)) != -1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.write(tempbytes, 0, byteread);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (Exception e1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>e1.printStackTrace();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} finally {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>if (in != null) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>in.close();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (IOException e1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div></div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>/**</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * 以字符为单位读取文件，常用于读文本，数字等类型的文件</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> *</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * @param fileName</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * 文件名</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> */</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>public static void readFileByChars(String fileName) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>File file = new File(fileName);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>Reader reader = null;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println("以字符为单位读取文件内容，一次读一个字节：");</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 一次读一个字符</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>reader = new InputStreamReader(new FileInputStream(file));</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>int tempchar;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>while ((tempchar = reader.read()) != -1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 对于windows下，rn这两个字符在一起时，表示一个换行。</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 但如果这两个字符分开显示时，会换两次行。</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 因此，屏蔽掉r，或者屏蔽n。否则，将会多出很多空行。</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>if (((char) tempchar) != 'r') {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.print((char) tempchar);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>reader.close();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (Exception e) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>e.printStackTrace();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println("以字符为单位读取文件内容，一次读多个字节：");</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 一次读多个字符</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>char[] tempchars = new char[30];</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>int charread = 0;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>reader = new InputStreamReader(new FileInputStream(fileName));</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 读入多个字符到字符数组中，charread为一次读取字符数</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>while ((charread = reader.read(tempchars)) != -1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 同样屏蔽掉r不显示</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>if ((charread == tempchars.length)</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>&& (tempchars[tempchars.length - 1] != 'r')) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.print(tempchars);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} else {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>for (int i = 0; i < charread; i++) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>if (tempchars[i] == 'r') {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>continue;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} else {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.print(tempchars[i]);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (Exception e1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>e1.printStackTrace();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} finally {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>if (reader != null) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>reader.close();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (IOException e1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div></div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>/**</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * 以行为单位读取文件，常用于读面向行的格式化文件</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> *</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * @param fileName</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * 文件名</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> */</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>public static void readFileByLines(String fileName) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>File file = new File(fileName);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>BufferedReader reader = null;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println("以行为单位读取文件内容，一次读一整行：");</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>reader = new BufferedReader(new FileReader(file));</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>String tempString = null;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>int line = 1;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 一次读入一行，直到读入null为文件结束</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>while ((tempString = reader.readLine()) != null) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 显示行号</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println("line " + line + ": " + tempString);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>line++;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>reader.close();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (IOException e) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>e.printStackTrace();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} finally {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>if (reader != null) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>reader.close();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (IOException e1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div></div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>/**</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * 随机读取文件内容</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> *</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * @param fileName</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * 文件名</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> */</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>public static void readFileByRandomAccess(String fileName) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>RandomAccessFile randomFile = null;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println("随机读取一段文件内容：");</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 打开一个随机访问文件流，按只读方式</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>randomFile = new RandomAccessFile(fileName, "r");</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 文件长度，字节数</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>long fileLength = randomFile.length();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 读文件的起始位置</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>int beginIndex = (fileLength > 4) ? 4 : 0;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 将读文件的开始位置移到beginIndex位置。</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>randomFile.seek(beginIndex);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>byte[] bytes = new byte[10];</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>int byteread = 0;</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 一次读10个字节，如果文件内容不足10个字节，则读剩下的字节。</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 将一次读取的字节数赋给byteread</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>while ((byteread = randomFile.read(bytes)) != -1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.write(bytes, 0, byteread);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (IOException e) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>e.printStackTrace();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} finally {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>if (randomFile != null) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>randomFile.close();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (IOException e1) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div></div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>/**</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * 显示输入流中还剩的字节数</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> *</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * @param in</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> */</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>private static void showAvailableBytes(InputStream in) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println("当前字节输入流中的字节数为:" + in.available());</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (IOException e) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>e.printStackTrace();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div></div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>public static void main(String[] args) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>String fileName = "C:/temp/newTemp.txt";</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// ReadFromFile.readFileByBytes(fileName);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// /ReadFromFile.readFileByChars(fileName);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// ReadFromFile.readFileByLines(fileName);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// ReadFromFile.readFileByRandomAccess(fileName);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div></div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>/**</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * A方法追加文件：使用RandomAccessFile</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> *</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * @param fileName</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * 文件名</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * @param content</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * 追加的内容</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> */</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>public static void appendMethodA(String fileName, String content) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 打开一个随机访问文件流，按读写方式</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>RandomAccessFile randomFile = new RandomAccessFile(fileName, "rw");</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 文件长度，字节数</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>long fileLength = randomFile.length();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 将写文件指针移到文件尾。</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>randomFile.seek(fileLength);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>randomFile.writeBytes(content);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>randomFile.close();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (IOException e) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>e.printStackTrace();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div></div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>/**</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * B方法追加文件：使用FileWriter</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> *</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * @param fileName</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> * @param content</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span> */</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>public static void appendMethodB(String fileName, String content) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>try {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>FileWriter writer = new FileWriter(fileName, true);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>writer.write(content);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>writer.close();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} catch (IOException e) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>e.printStackTrace();</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div></div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>public static void main1(String[] args) {</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>String fileName = "C:/temp/newTemp.txt";</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>String content = "new append!";</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 按方法A追加文件</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// AppendToFile.appendMethodA(fileName, content);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// AppendToFile.appendMethodA(fileName, "append end. n");</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 显示文件内容</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// ReadFromFile.readFileByLines(fileName);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 按方法B追加文件</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// AppendToFile.appendMethodB(fileName, content);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// AppendToFile.appendMethodB(fileName, "append end. n");</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// 显示文件内容</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>// ReadFromFile.readFileByLines(fileName);</div> <div><span class="Apple-tab-span" style="white-space:pre"> </span>} <div>} <div></div>
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