文件操作——读取、写入

package test.org.file;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.io.Reader;import java.text.DecimalFormat;import java.util.ArrayList;import java.util.Arrays;import java.util.List;public class FileOperation {public static final String[] fileBandString = { "图片文件", "jpeg2000", "tiff","psd", "png", "swf", "svg", "jpg", "jpeg", "pcx", "dxf", "wmf","emf", "gif", "bmp", "压缩文件", "rar", "zip", "7z", "cab", "iso","音频文件", "mp3", "wave", "aiff", "au", "mpeg", "cd", "mpeg-4","midi", "wma", "realaudio", "vof", "oggvorbis", "视频文件", "mp4","avi", "mov", "asf", "wmv", "navi", "3gp", "real video", "mkv","flv", "f4v", "rmvb", "webm" };public static final List<String> fileBandList = new ArrayList<String>(Arrays.asList(fileBandString));/** * @param args * @throws Exception */public static void main(String[] args) throws Exception {String filePath = "E:\\KuGou\\supplierss_save.jsp";filePath = "E:\\KuGou\\lvtu.mp3"; getFilePath(filePath);}/** * 以行为单位读取文件，常用于读面向行的格式化文件 *  * @param filePath * @throws Exception */public static void readLineByFileOprea(String filePath) throws Exception {File file = new File(filePath);//字符 缓冲流BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));//创建集合，存放读取的数据List<String> list = new ArrayList<String>();String line = null;//循环读取文件 直至读取的文件为空while ((line = br.readLine()) != null) {list.add(line);}//关闭流br.close();//调用写操作writeLineByFileOpera(filePath, list);}/** * 以行为单位写入文件，常用于读面向行的格式化文件 * @param filePath * @throws Exception */public static void writeLineByFileOpera(String filePath, List list)throws Exception {String strName = getFileName(filePath);File file = new File(strName);BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)));for (Object obj : list) {bw.append((String) obj);bw.newLine(); // 创建新 的一行}System.out.println(strName + "  Line   创建完成");bw.close();}/** * 读取文件单个字符 reader inutputSreamReader 字符流 以字符为单位读取文件，常用于读文本，数字等类型的文件 *  * @param filePath * @throws Exception */public static void readCharByFileOprea(String filePath) throws Exception {File file = new File(filePath);InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "UTF-8");List<Integer> list = new ArrayList<Integer>();int len = -1;while ((len = isr.read()) != -1) {list.add(len);}isr.close();writeCharByFileOpera(filePath, list);}/** * 写入文件单个字符 writer outtputSreamWriter 字符流 以字符为单位写入文件，常用于读文本，数字等类型的文件 * @param filePath * @throws Exception */public static void writeCharByFileOpera(String filePath, List list)throws Exception {String strName = getFileName(filePath);File file = new File(strName);OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream( file ), "UTF-8");for (Object obj : list) {osw.write((Integer) obj);}System.out.println(strName + "  Char   创建完成");osw.close();}/** * 读取文件多个字符 reader inutputSreamReader 字符流 以字符为单位读取文件，常用于读文本，数字等类型的文件 * @param filePath * @throws Exception */public static void readCharsByFileOprea(String filePath) throws Exception {File file = new File(filePath);Reader isr = new InputStreamReader(new FileInputStream(file), "UTF-8");List<Integer> list = new ArrayList<Integer>();char[] ch = new char[1024];int len = -1;while ((len = isr.read(ch)) != -1) {list.add(len);}isr.close();writeCharsByFileOpera(filePath, list, ch);}/** * 写入文件单个字符 writer outtputSreamWriter 字符流 * @param filePath * @throws Exception */public static void writeCharsByFileOpera(String filePath, List list,char[] ch) throws Exception {String strName = getFileName(filePath);File file = new File(strName);OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");for (Object obj : list) {osw.write((Integer) obj);osw.write(ch, 0, (Integer) obj);}System.out.println(strName + "   chars  创建完成");osw.close();}/** * 读取文件单个字节 inputstream fileInputSream 字节流 常用于读二进制文件，如图片、声音、影像等文件 * @param filePath * @throws IOException */public static void readByteByFileOpera(String filePath) throws IOException {    File file = new File(filePath);InputStream fis = null;fis = new FileInputStream(file);List<Integer> list = new ArrayList<Integer>();int len = -1;long time = System.currentTimeMillis();while ((len = fis.read()) != -1) {// 将读取的文件加入到集合中list.add(len);////计算读取的长度//String st = getReadFilePlan(list.size() ,  file.length());////打印进度//System.out.println(st);}fis.close();// 读取文件单个字节FileOperation.writeByteByfileOpera(filePath, list, time , file.length());}/** * 写入文件单个字节 outputStream fileOutputSteram 字节流 常用于写二进制文件，如图片、声音、影像等文件 * @param filePath文件路径 * @param list存放数据的集合 * @param time事件戳 * @param fileLength源文件大小 * @throws IOException */public static void writeByteByfileOpera(String filePath , List list , long time , long fileLength) throws IOException {    //获取文件名字    String fileName = getFileName(filePath);    //创建文件        File file = new File(fileName);        //创建字节流对象        OutputStream fos = new FileOutputStream(file, true);        //将数据写入文件        for (Object obj : list) {        fos.write((Integer) obj);//        //计算写入的进度//                String writePlan = getWriteFilePlan( file.length() , fileLength);//                //打印进度//                System.out.println(writePlan);        }        long time1 = System.currentTimeMillis();        System.out.println(fileName + "Byte  创建完成，耗时：" + (time1 - time) / 1000 + " 秒 ");                fos.close();}/** * 读取文件多个字节 inputstream fileInputSream 字节流 常用于读二进制文件，如图片、声音、影像等文件 * @param filePath * @throws Exception */public static void readBytesByFileOprea(String filePath) throws Exception {InputStream fis = new FileInputStream(new File(filePath));// 创建集合存储读取的二进制文件List list = new ArrayList();byte[] b = new byte[5000];int len = -1;while ((len = fis.read(b)) != -1) {//    System.out.println(new String(b, 0, len));list.add(len);}fis.close();// 如果list 为空，return ，不为空if (list.size() != 0) {writeBytesByFileOprea(filePath, list, b);} else {System.out.println("文件为空");return;}}/** * 写文件多个字节 outputStream fileOutputSteram 字节流 常用于写二进制文件，如图片、声音、影像等文件 * @param filePath * @param list * @throws Exception */public static void writeBytesByFileOprea(String filePath, List list,byte[] b) throws Exception {    //获取文件名    String fileName = getFileName(filePath);// 创建二进制文件写对象 并追加模式File file = new File(fileName);OutputStream fos = new FileOutputStream(file, true);// 遍历循环写操作for (Object obj : list) {fos.write(b, 0, (Integer) obj);}System.out.println(fileName + "bytes   创建完成");// 关闭流fos.close();}/** * 获取文件的名称和 格式 * @param filePath文件 * @return */public static String getFileName(String filePath) {long date = System.currentTimeMillis();// 获取文件格式并转换成小写String fileBand = getFileBand(filePath);return "D:\\KuGou\\" + date + "." + fileBand;}// 获取文件格式public static String getFileBand(String filePath) {String[] str = filePath.split("\\.");return str[1];}/** * 根据不同的文件类型执行不同的方法 * @param filePath * @throws Exception */public static void getFilePath(String filePath) throws Exception {String fileBand = getFileBand(filePath).toLowerCase();// 音频文件,视频文件，压缩文件if (fileBandList.contains(fileBand)) {    //字节流方法readByteByFileOpera(filePath);} else {    //字符流方法readCharsByFileOprea(filePath);//readBytesByFileOprea(filePath);}}/** * 读取文件的进度 * @param readFile读取文件的大小 * @param fileLength源文件的大小 * @return */public static String getReadFilePlan(long readFile , long fileLength){    DecimalFormat df=new DecimalFormat(".##");    double bai =readFile *10000 / fileLength;    String st = df.format(bai/100);    if(bai < 100){st = "读取进度："+ "0"+st + "%";    }else{st = "读取进度："+ st +"%";    }return st ;}/** * 读取写入文件的进度 * @param writeFile写入文件的大小 * @param fileLength写入源文件的大小 * @return */public static String getWriteFilePlan(long writeFile , long fileLength){    //格式化  保留两位小数    DecimalFormat df=new DecimalFormat(".##");    double bai =writeFile *10000 / fileLength;    String st = df.format(bai/100);    if(bai < 100){st = "写入进度："+ "0"+st + "%";    }else{st = "写入进度："+ st +"%";    }    return st;}}