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1. character stream 1.1 All files are stored in bytes. What we usually save on disk is not the characters of files, but the characters are converted into bytes first, and then stored on disk. When reading a file, it is also a byte-by-byte read, and then generates a sequence of bytes. 1.2 Byte streams can handle any object, but character streams ...

Previous A brief look at storm , mainly briefly explained the cluster architecture, core concepts, parallelism, stream grouping of storm. This article uses storm combined with code to count words, and explains how to understand introductory storm from the code level. Open code directly Word count simple implementation logic: Construct a Spout ...

If a crawler wants to crawl the required information, the first step is to grab the html content of the page, and then analyze the html to get the desired content. Last essay< Java Crawler Series 1: Write Before Starting > It is mentioned that HttpClient can crawl page content. Today, let's introduce the tool for grabbing html content: H ...

Definition of metadata Get the definition of the database in jdbc, for example: database, table, column definition information.Metadata is used. It can be used in jdbc: database metadata, parameter metadata, result set metadata. (Metadata Definition Related api,..MetaData) Two: Get the DataBaseMetaData object DatabaseMetaData ...

Personal blog address: http://www.pojun.tech/ Welcome to visit Server application Usually, as we say, there are two types of server applications: http server and application server. The typical representatives of http server are Apache Http Server and Nginx. The typical representatives of application server are IIS,Tomcat and jetty. _ ...

ZooKeeper has three installation modes: standalone, pseudo-cluster, and cluster: standalone mode: Install ZooKeeper on only one machine and start only one ZooKeeper instance. Pseudo Cluster: Open multiple ZooKeeper instances on one machine to simulate a cluster.This is achieved by loading different profiles and assigning different data direct ...

Let's first introduce the difference between intentService and Service. IntentService inheritance has the same declaration cycle and method as Service and Service. The difference is that IntentService is a google engineer who sees that we often do some time-consuming operations in Service to help us encapsulate it. If ...

``` Description: When setting up PHP environment, the source installation method failed, and the last yum cloud used was successfully installed (see another log for details), followed by a more detailed source installation method, which was first reloaded and recorded for later learning. ``` Install Configuration apache Gen ...

1. overview In this tutorial, I'll show you how to split a List into multiple sublists of a given size. For relatively simple operations, surprisingly, there is no support in the standard Java collection API. Fortunately, Guava and Apache Commons Collections The operations are implemented in a similar way.   2. Partitioning ...

  sudo wget http://learning.happymmall.com/deploy/deploy.sh echo "===========Get into git project happymmall Catalog=============" cd /developer/git-repository/mmall echo "==========git Switch to mmall-v1.0===============" git checkout mmall-v1.0 echo "==================git fetch======================" git fetch echo " ...