following program is a classic method to use slf4j.
import org.slf4j.Logger;import org.slf4j.LoggerFactory;public class Wombat { final Logger logger = LoggerFactory.getLogger(Wombat.class); Integer t; Integer oldT; public void setTemperature(Integer temperature) { oldT = t; t = temperature; logger.error("Temperature set to {}. Old temperature was {}.", t, oldT); if (temperature.intValue() > 50) { lo
which log system the final user chooses. On the other hand, if it is a simple or independent application and only one log system is identified, there is no need to use slf4j. If you want to sell your log4j product to users who require JDK 1.4 logging, it is definitely not easy to handle thousands of changes to log4j calls. However, if slf4j is used at the beginning, this conversion will be very easy.
3. source code and jar packages
Http://www.slf4j.org/download.html
4. Call example
Import org.
Learn about the concepts of Java packages, variables, and how objects interact with each other through methods.
In two articles, Wombat object basics and Wombat basics, you learned the basics of objects, classes, methods, and language and grammar. In part 3rd of the Junior Developer series, you'll learn how to write Java applications that rely on other Java classes (or Java APIs), what variables are, how t
explicitly select the specific drive. But in general, it is easier to let the drivermanager class handle the process of opening a connection.The following code opens a connection to a database in the URL "JDBC: ODBC: wombat. The User ID is "oboy" and the password is "12 Java ":String url = "JDBC: ODBC: wombat ";Connection con = drivermanager. getconnection (URL, "oboy", "12 Java ");2.1.2 URLs in general us
connected to the database specified in the URL. The driver method connect uses this URL to establish the actual connection.
You can bypass the JDBC management layer to directly call the driver method. This can be useful in the following special circumstances: when two drives can be connected to the database at the same time, the user needs to explicitly select the specific drive. But in general, it is easier to let the drivermanager class handle the process of opening a connection.
Below
Code
+ iguana + magpie + wombat, iguana is similar to l4env, magpie is similar to dice, and wombat is similar to l4linux. 2) Security sel4 + l4.verified. I cannot tell the differences between the two projects. sel4 indicates Security embedded L4. In short, even if formal method is used to verify okl4 is secure kernel, it seems that they have reached the level of machine code verification. The general step is to
class (byte code) file;
◆ Javac compiler, which is generated by the. Java file. Class file;
◆ Jar Java compression and packaging tools;
◆ Javadoc document builder.
The last step is JDK documentation. This is JDK's online help document and is the most useful and important learning reference document.
2. tomcat configuration:
(1) set environment variables:Tomcat_home = F:/tomcatCatalina_home = F:/tomcatJava_home = C:/program files (installation path, which is the default path)/Java/jdk1.5.0;Set c
1. Logger class
Use the static logger method logger. getrootlogger of the logger class to obtain the rootlogger. All other loggers are instantiated and obtained through the static method logger. getlogger. In this method, logger. getlogger takes the name of the logger as the parameter. Some other basic methods of the logger class are listed below:
Package org. Apache. log4j; Public class logger { // Creation and retrieval methods: Public static logger getrootlogger (); Pu
a read-write propertyWhose name would be "To get the property value and the ' setPair of methods May is located either in the same class or one is in a base class and theOther is in a derived class.If we find only one of the these methods, then we regard it as defining either a read-only or a writeonlyProperty called "By default we assume this properties is neither bound nor constrained (see section 7).So a simple Read-write property "Foo" might is represented by a pair of methods:Public
can be connected to the database specified in the URL. The Driver method connect uses this URL to establish the actual connection.You can bypass the JDBC management layer to directly call the Driver method. This can be useful in the following special circumstances: when two drives can be connected to the database at the same time, the user needs to explicitly select the specific drive. But in general, it is easier to let the DriverManager class handle the process of opening a connection.The fol
1.Logger classRootlogger is obtained by Logger.getrootlogger the static method of the Logger class. All other loggers are instantiated and obtained through the static method Logger.getlogger.This method Logger.getlogger the name of the desired logger as a parameter. Some other basic methods of the Logger class are listed below:
Packageorg.apache.log4j; PublicclassLogger {//Creation and Retrieval methods: PublicStaticLogger Getrootlogger (); PublicStaticLogger GetLogger (String name
Uicollectionview header hover, inherit Uicollectionviewflowlayout, override related methods////StickyHeaderLayout.h//Wombat////Created by Todd Laney on 1/9/13.//Copyright (c) toddla. All rights reserved.////Modified fromhttp://blog.radi.ws/post/32905838158/sticky-headers-for-uicollectionview-usingthanks!// #import@interfaceStickyheaderlayout:uicollectionviewflowlayout@end////STICKYHEADERFLOWLAYOUT.M//Wombat
#StaticLoggerBinder for further details.
Because slf4j is not bound to any log framework, if you add the slf4j-simple.jar to the class path:
Slf4j-api-1.7.12.jar
Slf4j-simple-1.7.12.jar
After compilation, the following output is displayed on the console:
[Main] INFO cn. ac. dicp. slf4j. HelloWorld-Hello World
Typical use Mode
The following simple code demonstrates the typical use mode of slf4j.
Import org. slf4j. Logger; Import org. slf4j
, named "com. Foo. Bar ",
// Will inherit its level from the logger named
// "Com. foo" Thus, the following request is enabled
// Because info> = info.
Barlogger.info ("located nearest gas station .");
// This request is disabled, because debug
Barlogger. debug ("exiting Gas Station Search ");
Call the getlogger method to return an instance of a logger object with the same name.
For example,
Categoty x = logger. getlogger ("wombat ");
Categoty y = lo
(), ' Abdul '); foreach ($iteratoras $result) {echo$result[' name ']; }/**output Jonathan **/5. Regexiterator inherits Filteriterator, which supports the use of regular expression patterns to match and modify elements in iterators. is often used to match strings. $a = new Arrayiterator (Array (' test1 ', ' test2 ', ' test3 ')); $i = new Regexiterator ($a, '/^ (test) (\d+)/', regexiterator::replace); $i->replacement = ' $2:$1 '; Print_r (Iterator_to_array ($i)); /**o
1.Logger class
The Rootlogger is logger.getrootlogger by the static method of the Logger class. All other loggers are instantiated and obtained by means of static method Logger.getlogger. This method logger.getlogger the desired logger name as an argument. Some other basic methods of the Logger class are listed below:
Package org.apache.log4j;
public class Logger { // Creation and retrieval methods: public static Logger getRootLogger(); public static Logger getLogger(String name); //
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.