read file into arraylist java

Properties class inherits from HashtableIt provides several main methods:1. GetProperty (String key) that searches for properties in this property list with the specified key. That is, by the parameter key, the value corresponding to the key is obtained.2. Load (InputStream instream) to read the list of attributes (key and element pairs) from the input stream. Gets all the key-value pairs in the file by loa

operation of the displacement. What does all this mean?This means that you just look for elements in a particular location or only add and remove elements at the end of the collection, so you can use either a vector or a ArrayList. If this is another operation, you might want to choose a different collection operation class. For example, does the Linklist collection class take the same amount of time to add or remove elements from any location in the

/** whether to turn on the Send SMS function */public Boolean ifsendsms () {String value= ""; try {Properties pps = new Properties ();pp s.load (RegisterAction.class.getResourceAsStream ("/config.properties")); value = Pps.getproperty ("if_send_sms"). Trim (); catch (FileNotFoundException e) {e.printstacktrace (),} catch (IOException e) {e.printstacktrace ();} catch (Exception e) { E.printstacktrace ();} if ("1". Equals (value)) {return true;} Else{return false;}}

Property class: Public StaticProperties Loadlocalproperties (String fileName) {Properties property=NewProperties (); Try{String path= Thread.CurrentThread (). Getcontextclassloader (). GetResource (""). GetPath (); InputStream in=NewBufferedinputstream (NewFileInputStream (path + "/" +fileName)); Property.load (in); } Catch(Exception e) {e.printstacktrace (); } returnProperty ; }ResourceBundle class: Public Static resourcebundle loadLocalProperties2 (String fileName) { retur

Package test.com;Import Java.io.FileInputStream;Import Javax.xml.parsers.DocumentBuilder;Import Javax.xml.parsers.DocumentBuilderFactory;Import org.w3c.dom.Document;Import org.w3c.dom.Element;Import Org.w3c.dom.Node;Import org.w3c.dom.NodeList;public class Xmlparser {public static void Main (string[] args) throws Exception {GetXML ("Src/parameters.xml", "holdername");}/*** @desc Gets the value of the node based on the value of the key property***/public static string GetXML (string Sqlxmlpath, S

Java io is really confusing, since there are FileWriter can write the character stream, why create DataOutputStream can also input character flow to the file. The following demo shows that files created by DataOutputStream can be read by FileReader. Package ZC; Import java.io.*; public class Test {public void stream () throws ioexception{ String s =

objects for spark appsJavasparkcontext sc = new Javasparkcontext (sparkconf);SqlContext sqlcontext = new SqlContext (SC);String url = "Jdbc:mysql://192.168.31.16:3306/db?useunicode=truecharacterencoding=utf-8";String table = "Tb_user";Properties ConnectionProperties = new properties ();Connectionproperties.put ("User", "root");Connectionproperties.put ("Password", "MySQL");Connectionproperties.put ("Driver", "com.mysql.jdbc.Driver");Loading data from a databaseJavarddjavarddPrivate static final

PackageCn.stat.p2.demo;Importjava.io.FileNotFoundException;Importjava.io.IOException;ImportJava.io.RandomAccessFile; Public classRandomaccessfiledemo {/** * @paramargs *@throwsIOException*/ Public Static voidMain (string[] args)throwsIOException {//TODO auto-generated Method StubRadomwrite (); Radomread (); } Public Static voidRadomread ()throwsFileNotFoundException, IOException {randomaccessfile RAF=NewRandomaccessfile ("Demo.txt", "RW"); byte[] buf=New byte[4]; Ra

Original: Java vs. io and NiO file read/write performance testSource code: Http://www.zuidaima.com/share/1550463508466688.htm1. NIO uses a way closer to the operating system to execute IO: Channels and buffers, as the name implies, data source data is transmitted by the buffer through the channel. 2. After JDK5, the raw IO system was optimized for NIO at the bott

1. Source Code/** * Read config file "currently only measured. Properties Profile" Tool class * Created by Li on 2015/9/13. */public class Propertiesutils { private static propertiesconfiguration propertiesconfiguration; static { try { //Initialize instance propertiesconfiguration = new Propertiesconfiguration ("Config.properties"); } catch (ConfigurationException

This article mainly introduces Java reading large files simple examples, the need for friends can refer to the I'm going to extract useful data nbsp; text files from a text file. 200 mbnbsp; is it possible to build a cache to put useful data in a section of the proposed, what should I do? nbsp; nbsp; Java can use memory-mapped files to manipulate large files .n

I want to extract useful data from a text fileText file more than 200 MBIs it possible to build a cache to put forward useful data for a paragraph, and what should I do?--------------------------------------------------------------- Oh, 200MB just ...In Java, you can use a memory-mapped file to manipulate large files.Up to 2GB Max.Here is a simple example of a m

Transferred from: http://www.cnblogs.com/pricks/archive/2009/11/11/1601044.htmlImportJava.io.File;Importjava.io.IOException;Importjava.util.ArrayList;ImportJava.util.Iterator;Importjava.util.List; Public classTest { Public Static voidMain (string[] args) {//CatalogueFile DataDir =NewFile ("e:/Resource Library resource/20091111"); //Store all file objects under the directory and its subdirectoriesListNewArraylist(); //Start Traversallistdirectory (Data

1. Archive for Required library: ' Webcontent/web-inf/lib/readme.txt ' in Project ' xxxxxxxxx ' cannot being read or is not a Val ID ZIP File2. The project cannot be built until build path errors is resolved3. Target Runtime Apache Tomcat v6.0 is not defined.These three problems are well resolved, as follows:1. Open the. classpath file in the project root directory with Notepad and locate the "2. Once the f

(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

publicstaticstringreadusenio (Filefile) {FileInputStream fin;stringstring=null;try{fin= Newfileinputstream (file);filechannelchannel=null; Channel=fin.getchannel ();// file content size intsize= (int) channel.size ();// get channel filechannelfc= fin.getchannel ();// Create buffer ByteBufferbuffer= Bytebuffer.allocate (1024*1024*1);// read data to buffer Fc.rea

Import Java.io.BufferedReader;Import Java.io.BufferedWriter;Import Java.io.File;Import java.io.FileNotFoundException;Import Java.io.FileReader;Import Java.io.FileWriter;Import java.io.IOException;public class Tttt {public static void Main (string[] args) {String lujing = "//2560p-pc/servermsglist/111.sisenmsg";//remote address and file can be changed as neededFile File = new

Package Java project into a jar package, if there is a resource file in the jar package needs to access, need to take the form of stream access, you can call the getResourceAsStream () method, and cannot be accessed by path (the file has been hit into the jar, Not conforming to the path). There are two ways to store using the getResourceAsStream () method

Operation Steps:1. First to the online download Jexcelapi rar package, the latest is: Jexcelapi_2_6_12.tar, and then unpack it, copy the Jxl.jar file to the Web-inf\lib directory or directly into the Java project2. The corresponding operation code is as follows: Packagecom.xqh.java.test; ImportJava.io.File; Importjava.io.IOException; ImportJXL. Cell; ImportJXL. Sheet; ImportJXL. Workbook; Importjxl.read.

Java simple read and output from fileWith scanner input, output with PrintStreamFunction: read from In.txt, output to OUT.txtCode:1 Packageiotest;2 3 ImportJava.io.*;4 ImportJava.util.Scanner;5 6 Public classTestmain {7 8 Public Static voidMain (string[] args) {9 Try {TenScanner sc=NewScanner (NewFile ("In.txt")); OnePrintStream ps=NewPrintStream (