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) {livedata data=new livedata ();d ata.createdata ();d ata.readdata ();} public void Createdata () {try {outputstream=new bytearrayoutputstream ();D Ataoutputstream dataoutputstream=new DataOutputStream (OutputStream); for (int i = 0; I 8. Sometimes, we need to calculate the number of words in a document, or the control of the document into the control of the document content (Control/Query text/number). Java
efficient reading of characters, arrays, and rows.You can specify the size of the buffer, or you can use the default size. In most cases, the default value is large enough.1 //character buffer input stream2BufferedReader br =NewBufferedReader (NewFileReader ("A.txt"));3 intLen = 0;4 Char[] ch =New Char[1024];5 while(len = br.read (ch))! =-1){6System.out.println (NewString (Ch,0,len));//Print the contents of the a.txt in a string way7 }
also provides a way to read and write various types of methods, using a similar method, which is no longer elaborated here, interested friends can try on their own.Attention: If you want to start reading from the file header, you must move the pointer to the head and seek () to assign the pointer to a position; Read (byte[]) can pass through the byte array to which all the bytes are reading; When a byte array is converted to a string, the encoding format of the primary string i
parameter can be automatically inferred based on the Type Declaration of the method. 3. built-in function interfaces:Java 8 APIS also provide many new functional interfaces to reduce the workload of programmers. PredicatesPredicate is a Boolean function with only one input parameter. The Predicate Interface contains multiple default methods for processing complex logical verbs (and, or, negate) Private sta
=Httpclient.execute (method); Httpurl= Urldecoder.decode (Httpurl, "UTF-8"); if(Response.getstatusline (). Getstatuscode () = = 200) { Try{result=entityutils.tostring (Response.getentity ()); } Catch(Exception e) {e.printstacktrace (); } } } Catch(IOException e) {e.printstacktrace (); } if(Result! =NULL){ returnresult; }Else{ return""; } } Private Static byte[] getcontent (httpres
Merge stream/Sequential stream (Sequenceinputstream):is to combine multiple input streams into a single Stream object.1 Public classSequenceinputstreamdemo {2 Public Static voidMain (string[] args)throwsException {3 //To create a sequential stream object4Sequenceinputstream in =NewSequenceinputstream (New
server side, it is used to send data to the client. Otherwise, it is used to send data to the server side. 3. Simple TCP network program 1 import java. io. outputStream; 2 import java.net. serverSocket; 3 import java.net. socket; 4 5 public class Example4 {6 public static void main (String [] args) throws Exception {7 new TCPServer (). listen (); // create the TCPServer object and call the listen () method 8
introduces repeated annotations so that the same annotations can be declared multiple times in the same place. The Repeatable annotation is required. Java 8 is optimized at the compiler layer, and the same annotation is saved as a set, so the underlying principle remains unchanged. 5. Support for extended annotations Java 8
to determine whether the original file at the end.1 Public classFileIO {2 Public Static voidMain (string[] args)throwsIOException {3String filename= "D:" +file.separator+ "Io.txt";4File file=NewFile (FileName);5InputStream inputstream=Newfileinputstream (file);6 byte[] by=New byte[1024];7 intCount=0;8 intTemp=0;9 while((Temp=inputstream.read ())!=-1){TenBy[count++]= (byte) temp; One A } - inputstream.close (); -SYSTEM.OUT.PRINTLN ("read-in length
and close the channel in}Catch(Exception e) { - System.out.println (e.tostring ()); to } + } - } the *}3. Writing files1 PackageCom.newdream.class4;2 3 ImportJava.io.BufferedReader;4 ImportJava.io.BufferedWriter;5 ImportJava.io.File;6 ImportJava.io.FileWriter;7 ImportJava.io.StringReader;8 9 Public classChariowriter {Ten One //writes text to the specified file A - - Public StaticString data=
(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); }finally { Try { if(in!=NULL) In.close (); if(out!=NULL) Out.close (); } Catch(IOException e) {e.printstacktrace (); } } LongEndTime =System.currenttimemillis (); LongSpendtime = EndTime-StartTime; System.out.println ("Method four, Bufferedinputstream and Bufferedoutputstream based on the addition of the cache array after the copy time:" + Spendtime + "millisecon
When uploading images using jsp, you can directly change the java code to jsp. The following exception occurs during the upload: 2012-12-31 8:59:21 org. apache. catalina. core. StandardWrapperValve invoke Severe: Servlet. service () for servlet jsp threw exception Java. io. IOException: Stream closed ... Think twice ab
1 PackageHahaa;2 3 Importjava.io.FileNotFoundException;4 ImportJava.io.PrintStream;5 6 Public classha {7 Public Static voidMain (string[] args) {8 Try { 9PrintStream out =System.out; Save the original output streamTenPrintStream PS =NewPrintStream ("./log.txt");//create file output stream One A System.setout (PS); Setting up a stream with a new
The so-called input stream is to read the data in the fileSimilarly, the character input stream InputStreamReader4 Construction methods, but 2 are more commonly used:Construction Method: A:inputstreamreader (InputStream is): reads data with default encodingB:inputstreamreader (InputStream is,string charsetname): reads data with the specified encodingA:inputstreamreader (InputStream is): reads data with defa
1. Copying multi-level folder casesRequirements: Copying multi-level foldersdata Source: E:\JavaSE\day21\code\demosDestination: E:\Analysis:A: Encapsulating the data source file B: Package destination file C: Determine if the file is a document or a folder A: is a folder Create the folder in the destination directorygets all files or folders under this file object file object iterate to get each file objectback to CB: It's a file. just copy (Byte stream
* Copy of text files can be achieved using FileReader and FileWriter.* For non-text files (video files, audio files, pictures), only the byte stream can be used!1 @Test2 Public voidTestfilereader () {3FileReader FR =NULL;4 Try {5File File =NewFile ("Dbcp.txt");6FR =Newfilereader (file);7 Char[] C =New Char[24];8 intLen;9 while(len = Fr.read (c))! =-1){TenStr
I/O flow Grouped by data into byte stream and character streams (coded table, Western ASCII, China gb2312 expansion for gbk--> Unified for Unicode--> optimization utf-8)Character streams are based on the byte stream, specifying what table to look forThe flow is divided into input and output streams.Common base class: byte s
Java-IO stream RandomAccessFile class, iorandomaccessfile RandomAccessFile RafDemo. java Package com. test. io; import java. io. file; import java. io. IOException; import java. io. randomAccessFile; import
Special methods for character buffer streams:A, Bufferedwriter: public void NewLine (): based on system to determine line break1 Private Static voidWrite ()throwsIOException {2 //creating a character output buffer stream3BufferedWriter BW =NewBufferedWriter (NewFileWriter ("bw.txt"));4 for(intx = 0;x ){5Bw.write ("java" +x);6 //automatically wrap every time.7 Bw.newline ();8
(); - } -}To copy a binary file using a buffered stream:1 Private Static voidIoDemo3 () {2 Try {3Bufferedinputstream bis =NewBufferedinputstream (NewFileInputStream ("D:/test.xlsx"));4Bufferedoutputstream BOS =NewBufferedoutputstream (NewFileOutputStream ("C:\\users\\yan\\desktop\\test.xlsx"));5 byte[] buffer =New byte[2048];6 intRead =bis.read (buffer);7 while(Read!=-1)8
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