Java

Core processing attachment name Chinese garbled The code is as follows Copy Code Html.setfilename ("=? GBK? B "+ Enc.encode (File.getname (). GetBytes (" GBK ")) +"? = "); You can. Mail send code as follows

File object is the most commonly used class of files, usually work a lot, posted a few I work commonly used several methods. Briefly summed up the next Directly on the code: The build file Object file File=new file ("e:/android_demo/a"); File

Many languages, including Perl, PHP, Python, JavaScript, and JScript, support the use of regular expressions to process text, and some text editors implement advanced search-replace functionality with regular expressions. So the Java language is no

First, install the JDK 1. See if Linux is installed with its own JDK If OPENJDK is present, it is best to uninstall the OPENJDK and install the Sun Company's JDK. 2. View JDK Information 3. Uninstall OPENJDK and do the

1. Introduce The use of Java-implemented serial communication program to support the sending and receiving of hexadecimal data.SOURCE Download Address: http://download.csdn.net/detail/kong_gu_you_lan/9611343 The effect chart is as follows:

Java and Excel are connected to the Jxl.jar open source package, and SQLite3 connection with the Sqlitejdbc-v056.jar this open source package, two open source package download: Portal If you are using Eclipse to do development, after decompression,

Public Static String date_year= "Year"; // years Public Static String date_month= "MONTH"; // Month Public Static String date_day= "Day"; // Day// 7 Days Date date_day = dateoperation (date_day,-7); // 1 months Date date_month = dateoperation

1.double type(1) Double is a dual-precision floating-point number (commonly used, 8-byte 64-bit), and a double is used to perform the operation of floating-point numbers(2) floating point Direct quantity is double type(3) error when double operation2

Java Web Base---URL redirection filterHttprequest.getrequestdispatcher ("/helloworld"). Forward (HttpRequest, response);Server-side forwarding, does not change the browser-side URL address, commonly usedHttpresponse.sendredirect (URI);Browser end

Relationships between classes and classes in Java1. Aggregation relationship: Two classes have a low degree of association and can exist separately.2. Combined relationship: Two are relatively high degree of association.How to represent this

There are several concepts to learn about sockets:A Socket refers to each endpoint in an Internet connection. How the Internet connection is created, via the IP address plus port number, for interoperability.A computer (192.168.3.125:80) "" B

JavaSE-UDP protocol network programming (2), javaseudp In UDP network programming, the sender has no connection with the receiver, and there is no obvious difference between the server and the client. Class DatagramSocket: This class indicates

Use Spring Boot to develop "Hello World" Web applications, springhelloEnvironment preparation Because many ides currently support Maven, we will use Maven to build this project; Before you start, install Java and Maven: This project will be

Some people write Java for a while, but do not know much about Java package and import? Why? The import in the program. java file will allow the compiler to write the imported program to the compiled. class file, or recognize it? Import and C/C

BacklogFor ServerSocket, configure the maximum client waiting queue for ServerSocket. The meaning of the waiting queue. First look at the following code The code is as follows:Copy code Public class Main {Public static void main (String [] args)

1. hibernate. cfg. xml The code is as follows:Copy code "-// Hibernate/Hibernate Configuration DTD 3.0 // EN"Http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd> org. hibernate. dialect. MySQLDialect com. mysql. jdbc. Driver root

To match a regular expression with a Chinese character, you must first understand the Chinese character encoding. The code is as follows:Copy code [U4E00-u9FA5] Chinese characters? [UFE30-uFFA0] fullwidth characters[U4E00-u9FA5] Chinese

I. Installation and configuration of the java development environment1. Download JDK.2. Install JDK. Note that there are no spaces in the installation path during installation. For example, the installation path is D: Javajdk1.6.0 _ 30.3. Set

Core code for getting the number of record columns in the ResultSet  The code is as follows:Copy code ResultSetMetaData rsmd = this. rs. getMetaData ();This. columnCount = rsmd. getColumnCount (); The code for java to obtain the number of data

First, use the jdk built-in tool jmap dumping (dump) java memory heap data to local files. The jmap dump command format is as follows:Jmap-dump: indicates the dump option, and indicates the process ID of the java application that requires