JAVA——常见IO流的使用

import java.io.*;/** *  * @author KevinWu 文件操作示例 * */public class FileHandle {public static void main(String[] args) {// TODO Auto-generated method stubFileHandle myFileHandle = new FileHandle();myFileHandle.readTxtFile("a.txt");myFileHandle.copyTxtFile("a.txt", "b.txt");myFileHandle.copyNonTxtFile("111.pdf", "222.pdf");myFileHandle.outPut("测试输出字符串", "test.txt");myFileHandle.creatFolder(".", "我是新建的文件夹");// 路径给点，表示当前目录}/** * 方法作用：读取文本文件的方法 参数：待读取文件的路径 */public void readTxtFile(String file_dir) {// 创建并实例化文件对象File myFile = new File(file_dir);// 判断该对象对应的路径下是不是存在这个文件和是不是文件类型if (!myFile.exists() || !myFile.isFile()) {System.out.println("文件不存在或不是文件类型");} else {// 新建FileReader对象FileReader myFileReader = null;// 新建BufferedReader对象BufferedReader myBufferedReader = null;try {// 实例化FileReader对象myFileReader = new FileReader(myFile);// 实例化BufferedReader对象myBufferedReader = new BufferedReader(myFileReader);// 定义一个字符串来接收文件的一行内容String str = "";while ((str = myBufferedReader.readLine()) != null) {// 把读取到的内容输出System.out.println(str);}} catch (IOException e) {e.printStackTrace();} finally {// 在这里关闭缓冲流和输入流，注意要一层一层关if (myBufferedReader != null) {try {myBufferedReader.close();} catch (IOException e) {e.printStackTrace();}}if (myFileReader != null) {try {myFileReader.close();} catch (IOException e) {e.printStackTrace();}}}}}/** * 方法作用：复制文本文件方法 参数1：待复制的文件的路径 参数2：复制目标的文件的路径 */public void copyTxtFile(String f_dir, String t_dir) {// 创建并实例化文件对象File fFile = new File(f_dir);File tFile = new File(t_dir);// 先判断源文件存不存在和是不是文件类型，就不考虑文件是否可读的问题了if (!fFile.exists() || !fFile.isFile()) {System.out.println("文件不存在或者不是文件类型");} else {// 创建FileReader对象FileReader myFileReader = null;// 创建FileWriter对象FileWriter myFileWriter = null;// 创建BufferedReader和BufferedWriter对象BufferedReader myBufferedReader = null;BufferedWriter myBufferedWriter = null;try {// 实例化FileReader和BufferedReader对象myFileReader = new FileReader(fFile);myBufferedReader = new BufferedReader(myFileReader);// 实例化FileWriter和BufferedWriter对象myFileWriter = new FileWriter(tFile);myBufferedWriter = new BufferedWriter(myFileWriter);// 用一个字符串接受数据String str = "";while ((str = myBufferedReader.readLine()) != null) {myBufferedWriter.write(str);// 换行myBufferedWriter.newLine();// 刷新缓冲流myBufferedWriter.flush();}} catch (IOException e) {e.printStackTrace();} finally {if (myBufferedWriter != null) {try {myBufferedWriter.close();} catch (IOException e) {e.printStackTrace();}}if (myFileWriter != null) {try {myFileWriter.close();} catch (IOException e) {e.printStackTrace();}}if (myBufferedReader != null) {try {myBufferedReader.close();} catch (IOException e) {e.printStackTrace();}}if (myFileReader != null) {try {myFileReader.close();} catch (IOException e) {e.printStackTrace();}}}}}/** * 方法作用：复制非文本文件方法 参数1：待复制文件的路径 参数2：复制目标文件的路径 */public void copyNonTxtFile(String f_dir, String t_dir) {File fFile = new File(f_dir);File dFile = new File(t_dir);if (!fFile.exists() || !fFile.isFile()) {System.out.println("文件.....");} else {FileInputStream fis = null;FileOutputStream fos = null;BufferedInputStream bis = null;BufferedOutputStream bos = null;try {fis = new FileInputStream(fFile);fos = new FileOutputStream(dFile);bis = new BufferedInputStream(fis);bos = new BufferedOutputStream(fos);byte b[] = new byte[1024];int length;while ((length = bis.read(b)) != -1) {bos.write(b, 0, length);bos.flush();}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if (bos != null) {try {bos.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (fos != null) {try {fos.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (bis != null) {try {bis.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (fis != null) {try {fis.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}}/** * 方法作用：把字符串内容输出到文本文件 参数1：待输出的字符串 参数2：目标文件路径 */public void outPut(String dstStr, String f_dir) {File fFile = new File(f_dir);try {FileWriter myFileWriter = new FileWriter(fFile, true);// 设置为追加PrintWriter pw = new PrintWriter(myFileWriter);pw.println(dstStr);// 方便起见直接在这里关闭了pw.close();myFileWriter.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/** * 创建文件夹 参数1：待创建的文件夹的路径 参数2：待创建的文件夹的名称 */public void creatFolder(String f_dir, String f_name) {File fDir = new File(f_dir + "/" + f_name);if (fDir.exists()) {System.out.println("文件夹已经存在");} else {fDir.mkdirs();// 创建文件夹，如果父目录不存在一并创建}}}