fitler commons

When you are developing a program, debugging (debugging) and logging are very important tasks. However, there are too many logging APIs available because they are both good, it is difficult to make a choice. the foreign Java Forum also has some discussions on these logging methods. While common logging is a small bridge between these different logging APIs. currently, the most famous LOG method in Java is log4j and JDK 1.4 logging API. in addition, there are logkit and so on used in aveon.

There are many sub-projects in the Apache Jakarta project. Commons focuses on providing a variety of common functions/classes. You can use it in your own projects. These tools are so common that no matter which framework you use Some of them can be used to save your coding workload, and the code quality is also very good. Part of commons tools's starting point is to solve the various deficiencies in JDK: 1.

When a file item is encapsulated as a fileitem object, if the file size exceeds the critical value, it will be written to a temporary file. Cleanup method 1 When these temporary files are no longer used (if the corresponding Java. io. file is recyclable, which is better) will be automatically deleted. this will be. apache. commons. io. A harvest thread started by an instance of filecleaningtracker is silently executed. In a web application, resour

In a recent project to be useful to commons-fileupload components to implement file Upload function (as a result of useless to the framework), in the use of the process has encountered some problems, after their own pondering also successfully resolved, here to make a record.　I. Introduction to the Commons-fileupload File upload componentThe Commons-fileupload up

Jakarta commons digester introduction and usage 2004-02-27 Browsing times: 757 1. Digester allows you to configure an XML file to be converted to a Java object.ProgramWhen some XMLSpecial properties will trigger some actions called rules, some of which have been defined,Of course, you can also set up what you need. digester also includes the fo

Although Google's guava a certain encapsulation of Java IO operations, but it is more in favor of the collection, concurrency and caching, in the actual project, I like guava very much, I also like the Apache Toolkit Org.apache.commons.io, which provides a very powerful tool capability that simplifies code logic, improves development efficiency and quality, and is a toolkit that every Java programmer should master. This article briefly introduce Org.apache.commons.io, detailed can refer to its A

Recently use Apache Commons-net.jar do ftp upload download function, click "Upload" when the error, as follows:1 Java.lang.ClassNotFoundException:org.apache.oro.text.regex.MalformedOnline search, there are two ways, 1: Maybe the local Windows XP jdk is 1.6.15 Yi, packaged, Use the 1.6.15 JDK to run an error, and replace it with a JDK higher than jdk1.6.15 to run; 2. Missing Jakarta-oro-2.0.8.jar file.At first, I tried to get my colleagues to run with

[Oracle @ REDHAT6database] $. runInstaller ** the image is used by someone else. My error is to change "HZXG" to "REDHAT6" on the image and view the error log --- # BeginStacktrace # ----------------------- ID: oracle. install. commons. util. exception. D [Oracle @ REDHAT6 database] $. /runInstaller ** the image applies to others. My own error is to change "HZXG" to "REDHAT6" on the image and view the error log --- # Begin Stacktrace # ---------------

Package mail; import java. Io. unsupportedencodingexception; Import java.net. malformedurlexception; Import java.net. url; import javax. Mail. Internet. mimeutility; import org. Apache. commons. Mail. emailattachment; Import org. Apache. commons. Mail. emailexception; Import org. Apache. commons. Mail. htmlemail; Import org. Apache.

[DAO] The DAO data layer code based on apache. commons. dbcp, commonsdbcp**************************************** ********************************* *** Original article: blog.csdn.net/clark_xu Xu changliang's column**************************************** ******************************** DAO code is mainly based on the dept (Department List) emp (employee information list) of scott, the default oracle user. The connection pool connecting JDBC to oracl

Reference: http://www.informit.com/guides/content.asp? G = Java seqnum = 40 Although the Jakarta Apache organization has released a large number of open source projects, I am afraid Tomcat Servlet Engine is the most popular and widely used project. If you have implemented internet protocols like FTP, telnet, SMTP, POP3, and NNTP, you will know how difficult it is to check the specific implementation errors of these protocols. But now you don't have to worry about this issue. The

JSP component commons-fileupload implements file upload and jsp File Upload components This article shares with you the code for using commons-fileupload to upload files in JSP for your reference. The details are as follows: 1. preparation: Copy commons-fileupload-1.1.zipand commons-io-1.1.zip to the "\ WEB-INF \ lib"

There is a log in front of a simple introduction of log4j, but also introduced its relationship with commons-logging, but suddenly came out of a slf4j, and SLF4J has replaced the commons-logging trend, so, We can infer that the role of SLF4J and commons-logging shouldThere is little difference. OK, let's start with slf4j.1.slf4jHe only provides a core SLF4J API (

Concept DescriptionApache Commons CLI IntroductionDespite the rapid development of various human-computer interaction technologies, the most traditional command-line pattern is still widely used in various fields: from compiling code to system administration, the command line is favored by its simplicity and efficiency. Various tools and systems provide a detailed user manual, and some provide examples of how to develop it two times. However, there ar

The initial setup of my logging frameworkHow to set up my log frame.The original text comes from Http://log4e.jayefem.de/index.php/Log4E:FAQIf you are are already familiar with your logging framework you might want to skip this section.This is chapter gives you a slight idea of how to make the initial setup of your logger. This isn't supported by log4e at the moment and the ' not ' intended use in the beginning of this project.LOG4E does not ship the any logging framework which means, have to do

Before using Runtime.getruntime (). Exec calls an external program, and under Tomcat there is a phenomenon where the current thread waits. In order to solve this problem, using the new thread to receive output information from external programs, see the blog http://blog.csdn.net/accountwcx/article/details/46785437 for details.Later on the internet found open source Java call external Program class library Apache Commons exce, this class library provid

The dependency package for the commons-fileupload-1.3.1.jar toolkit is commons-io-2.2.jar (fileuploaddepends on commons Io, so make sure you have the version mentioned on thedependenciespage in your classpath before continuing .) Commons-fileupload-1.3.1.jar The Wiki on the official website explains:

Exception error: Caused by: Org. apache. commons. DBCP. sqlnestedexception: cannot create poolableconnectionfactory (the database is already in use by another process: Org. HSQLDB. persist. niolockfile @ 4a60a3da: Java. lang. exception: the process cannot access the file because another program has locked part of the file. : D:/Zhao/code/OTAs-ds-workspace/OTAs-ds-server/output/funambol/tools/hypersonic/data/funambol. LCK)At org. Apache.

This article is fromBlog, please be sure to keep this source http://zhangjunhd.blog.51cto.com/113473/18331 Place the Apache commons-fileupload.jar under the WEB-INF \ Lib of the application. The following is an example of how to use its file upload function.The used fileupload version is 1.2, and the Environment is eclipse3.3 + myeclipse6.0. Fileupload is based on commons Io, so before entering the projec

First throws a classic question:Are aware that most applications that connect to MySQL use frameworks such as C3P0, DBCP Proxool, and so on to manage database connection pooling. Database connection pooling is undoubtedly a long-connected approach. So why does the MySQL classic eight-hour problem arise?I began to doubt that since it is a long connection there must be constant heartbeat detection mechanism has been constantly harassing the service side, then how can the server also detect a eight