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Doing Java for so long, has been doing web-related projects, some basic classes have almost forgotten. Often want to pick up, but always for some reasons, can not be fulfilled.In fact, there is no time, but sometimes tired of summing up, this hollow, determined to throw away all to pick up.File reading and writing is a frequently encountered work in a project, sometimes because of maintenance, and sometimes new features development. Our task is always
If your applicationcontext. xml file is placed under the WEB-INF:
Use the classpathxmlapplicationcontext class!
ApplicationContext context = new ClassPathXmlApplicationContext("/WEB-INF/applicationContext.xml");
While classpathxmlapplicationcontext this class will eventually look for it under the WEB-INF/classes/directory, after your project is finally deployed, everything under SRC will be deployed under the WEB-INF/classes/directory, so the wood f
There are several common methods to read and write files:1. Byte read/write (InputStream/OutputStream) and character read (FileReader/FileWriter)FileInputStream's read (buffer) method, each time from the source program file OpenFile.
ability to read Microsoft Outlook format files.
Reading an Excel Document samplewe use the Hssfworkbook in POI to read the Excel data.
public void Test (file file) throws IOException {
InputStream INP = new FileInputStream (file);
Hssfworkbook workboo
*/EnumerationProp.propertynames (); while(Enums.hasmoreelements ()) {/*cast each property to a string type to get the key*/String Key=(String) enums.nextelement (); /*gets the corresponding value according to the key (string type)*/String Value=Prop.getproperty (key); /*output the contents of the Properties property file*/System.out.println (Key+ "----" +value); } } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {
the file after reading the file. But it returns not a byte array, but an array of strings. Furthermore, Java8 overrides this method, eliminating the need to specify character sets and directly using UTF-8 encoding for string conversions.
If you want to read a line of text as a string, you can use the Files.lines () m
This article mainly compares and analyzes the efficiency of using the file function and fseek function in php to read large files, which has a certain reference value, if you are interested, you can refer to the file function and fseek function for php to read large files. H
{file path for//classpathPrivateStaticString CP ="/com/lavasoft/cfg/syscfg.properties"; PublicStaticvoidMain (string[] args) {//absolute path of the current classSystem.out.println (Test.class. GetResource ("/"). GetFile ()); //Specify an absolute path to the Classpath fileSystem.out.println (Test.class. getresource (CP). GetFile ());//Specify an absolute path to the Classpath fileFile f =NewFile (Test.class. getresource (CP). GetFile ());System.out.
the php file read/write tutorial, we have not used the file_exists function. Generally, for various considerations, sometimes when the file does not exist, we do not like creating a new file, in this case, we need to use the file_exists function before using the fopen funct
Introduction to Java NIO (iii) from theory to practice: using NIO to read and writeGuibin.beijing@gmail.com
OverviewReading and writing are the most basic IO processing. Reading from a Channel is very simple. We only need to create a Buffer and then require the Channel to read data to the Buffer. Writing is also very s
first attached I refer to the article, based on the flexpaper version of 1.5, I am using the 2.1.9, so after the description:
loading Chinese filename has been supported
code Download
1. Overview
Main principle
1. Through the Third-party tools OpenOffice, Word, Excel, PPT, TXT and other files into PDF files
2. Convert PDF
Instance Source think in java read: different types of information are returned for reading files as needed. Instance 1 is read using BufferReader. [Java] package io; // use Reader to read import
One: Cause(1) Before processing text data, all kinds of cleaning data are used in Java File,filereader/filewriter,bufferedreader/bufferedwriter class, see Java Read-write text file(2) Java is used because the map in
read data, use br. close () to close the cache, and use fr. close () to close the file.
For the complete code, see Example 3.
The common methods for writing files using FileWriter are as follows:
FileWriter fw = new FileWriter ("mydata.txt ");
PrintWriter out = new PrintWriter (fw );
Write data into files
In general, we will write some configuration information to the configuration file in order to make changes to some points of the program without modifying the source code. Here's a way to read the XML configuration file in spring, with the basic idea of defining a Java clas
execution ).
My machine has 2 GB of memory. when I press F5 to run the machine, the system will be grayed out directly, and it will be restored after about 20 minutes. it can be seen that all such large files will be directly read into the memory, the consequence is serious, so no more than. memory_limit cannot be too high. Otherwise, you only need to call the data center to let the reset machine go.
2. directly use PHP fseek for
The problem of using feof () to read files more than once is a classic mistake. This is the case in many schools. After reading the last character of the file, FP-> flag is still not set to _ ioeof, so feof () still does not detect the end of the file. Feof () cannot detect the end of a
(len = fis.read (buffer)) >0){Fos.write (Buffer,0,len);}}Did you find any specific reasons for this?Cause: If you upload a file using the above code, open the uploaded file to indicate that the file is being consumed by another application. But after a while, you can open i
();4Workbook. Createemptysheets (1);5Worksheet sheet = workbook. worksheets[0];6 7Sheet. range["A1"]. Text ="Lock";8Sheet. range["B1"]. Text ="not locked";9 TenSheet. range["A1"]. style.locked =true; OneSheet. range["B1"]. style.locked =false; A - //Be sure to protect the worksheet before it takes effect -Sheet. Protect ("Test", Sheetprotectiontype.all); the -Workbook. SaveToFile (@"sample_lock.xlsx", excelversion.version2010); -}Today is the end, although all very simple, but to understa
the. config to use are as follows:[HTML]View PlainCopy
span style="Font-family:microsoft yahei;font-size:12px;" > XML version= "1.0" encoding="GBK"?>
Accounts>
account type="by0003">
code>100001code>
pass>123pass>
name> John Doe name>
money>1000000.00money>
Account>
Accounts>span>
2. Read the properties file
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