Java print stream recursive copy sub-file subfolders copy different encoding files to the same file serialized stream deserialization stream, java serialization

Java print stream recursive copy sub-file subfolders copy different encoding files to the same file serialized stream deserialization stream, java serialization

Package com. swift. jinjie; import java. io. bufferedInputStream; import java. io. file; import java. io. fileInputStream; import java. io. IOException; import java. io. printStream;/* enter a folder path from the keyboard and copy all files (including subfolders) in the folder to the temp folder on disk D using the print stream. */Public class PrintAllToFile {public static void main (String [] args) throws IOException {File srcDir = new File ("d:/abc "); file destDir = new File ("d:/temp"); printAllFile (srcDir, destDir); System. out. println ("including subfolders copied successfully");} private static void printAllFile (File srcDir, File destDir) throws IOException {if (! DestDir. exists () {destDir. mkdirs ();} File [] files = srcDir. listFiles (); for (File file: files) {if (file. isDirectory () {File destDirNew = new File (destDir, file. getName (); printAllFile (file, destDirNew);} else {File destFile = new File (destDir, file. getName (); BufferedInputStream bis = new BufferedInputStream (new FileInputStream (file); PrintStream ps = new PrintStream (destFile); int len; byte [] buf = new B Yte [1024]; while (len = bis. read (buf ))! =-1) {ps. write (buf, 0, len );}}}}}

Copy different encoding files to the same file

Package com. swift. jinjie; import java. io. file; import java. io. fileInputStream; import java. io. fileNotFoundException; import java. io. fileOutputStream; import java. io. IOException; import java. io. inputStreamReader; import java. io. outputStreamWriter;/* d:/abcdisk contains two upload files, a.txt and B .txt. In this example, a.txt adopts GBK, while B .txt uses utf8. You must use the conversion stream to implement the following functions: copy the.txt and B .txt files to the c.txt file to ensure that the content is not garbled. */Public class MergeTxt {public static void main (String [] args) throws IOException, FileNotFoundException {File file1 = new File ("d:/abc/a.txt "); file file2 = new File ("d:/abc/B .txt"); File destFile = new File ("d:/abc/c.txt"); mergeFile (file1, file2, destFile);} private static void mergeFile (File file1, File file2, File destFile) throws IOException {InputStreamReader isr1 = new InputStreamReader (new FileI NputStream (file1), "gbk"); InputStreamReader isr2 = new InputStreamReader (new FileInputStream (file2), "UTF-8"); OutputStreamWriter osw = new OutputStreamWriter (new FileOutputStream (destFile, true), "UTF-8"); int len; char [] buf = new char [1024]; while (len = isr1.read (buf ))! =-1) {osw. write (buf, 0, len); osw. flush ();} while (len = isr2.read (buf ))! =-1) {osw. write (buf, 0, len); osw. flush ();} osw. close (); isr1.close (); isr2.close (); System. out. println ("file copied successfully ");}}

Deserialization

Package com. swift. jinjie; import java. io. fileInputStream; import java. io. fileNotFoundException; import java. io. fileOutputStream; import java. io. IOException; import java. io. objectInputStream; import java. io. objectOutputStream; import java. util. producer; import com. swift. baseKnowledge. student;/* includes Student ID, name, Province ID, Java score, mathematics score, English score, and other member variables. The constructor and setter and getter methods are provided. Requirements: * student information and student ID card numbers are saved to the save.txt file on the C drive. * student ID card numbers cannot be saved to the file. * If save.txt does not exist during program operation, enter one student information on the keyboard. The information input format is as follows: ***** enter the student information ***** enter the student ID: 9527. Enter the name: please enter your ID card number: 2203919831234543. Please enter your Java score: 90. Please enter your math score: 80. Enter your English score: 88. The student ID is saved to the save.txt file on the C drive. * If the save.txt file already exists at the program runtime, the student information is displayed. The format is as follows: * *** student basic information *** student ID name province ID number Java score mathematical score English score 9527 huaan null 90 80 88 */public class Fanxuliehua {public static void main (String [] args) throws FileNotFoundException, IOException, ClassNotFoundException {inputInfo ();} private static void inputInfo () throws FileNotFoundException, IOException, ClassNotFoundException {today scan = new today (System. in); for (int I = 0; I <1; I ++) {System. out. print ("Enter student id:"); String id = scan. next (); Student student = new Student (); student. setId (id); System. out. println ("Enter name:"); String name = scan. next (); student. setName (name); System. out. println ("Enter your ID card number:"); String uid = scan. next (); student. setUid (uid); ObjectOutputStream oos = new ObjectOutputStream (new FileOutputStream ("save.txt"); ObjectInputStream ois = new ObjectInputStream (new FileInputStream ("save.txt"); oos. writeObject (student); Student stu = (Student) ois. readObject (); System. out. println (stu); System. out. println ("student ID name ID card number mathematical score Chinese score total score"); System. out. println (stu. getId () + "" + stu. getName () + "" + stu. getUid () + "" + stu. getShuxue () + "");}}}