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During the development of uploading and downloading files on FTP, you can log in to the FTP server, but the upload and download always report an error. After that, the FTPClient.enterLocalPassiveMode() method is added before the operation. Success.Note: call ftp client. Enterlocalpassivemode(); this method means that before each data connectio ...

Preface: This tool class provides the excel import function. Through the reflection mechanism, the data in excel is mapped to the entity class to obtain Excel data. The tool class depends on the org.apache.poi package. It supports RESTful API and Spring MVC. I. supporting functions of this tool class: Support File type impo ...

Preface When it is necessary to operate on files, it is inevitable to use IO flow; for example, some contents in the response results of some requests need to be stored in the business. When the file to be processed is too large, if you close the file stream frequently, it will cause a lot of overhead. When do you close it? It often causes grea ...

Experimental environment A CentOS 7.3 virtual machine with minimal installation Configure the base environment 1. Install apache yum install -y httpd 2. Establish the root directory of the virtual host mkdir /var/wwwroot mkdir /var/wwwroot/site1 mkdir /var/wwwroot/site2 echo -e "site1" >> /var/wwwroot/site1/index.html echo -e "site2" &g ...

Java Socket framework Apache MINA: implement Socket server Now, Apache MINA is used to realize a simple Socket Server. The Server implements a simple function. When a Socket client connects, it sends a simple string "zhangphil" to the client. The Server-side program code is as follows: import java.net.InetSocketAddr ...

abstract In Pulsar, Function, Source, and Link are all running on Function Worker, and you can refer to Function for reference An article about Pulsar Functions , you can refer to the use of Source and Link Introduction to Pular Source Pular Sink Getting Started Guide. This paper introduces the election mechanism of Functions Worker.Read th ...

Flume collects Log4j logs and sends them to Kafka for storage Environmental preparation Download Flume: http://flume.apache.org/ Install: extract the download package to the custom path Configure agent # Function: filter json information storage kafka agent.sources = s1 agent.channels = c1 agent.sinks = k1 agent.sources.s1.type = avro agen ...

In the business scenarios of order and payment, the generation rules and methods of DOC No. are very important. There are many kinds of implementation. The simplest one is based on mysql auto add primary key. The advantages and disadvantages of the scheme are not much discussed, and everyone knows. Today, we implement a distrib ...

The format of the log is as follows: required fields, the second column: mobile number (user), the third last column: uplink traffic, the second last column: downlink popular Train of thought: Encapsulate the uplink traffic, downlink traffic and total traffic into an object bean. In the map, context.write (cell phone number ...

Absrtact: This article mainly studied how to install Tomcat server in Linux environment. Preparation Check Java environment variables Check whether the system is configured with Java environment variables: 1 [root@localhost ~]# java -version 2 java version "1.8.0_91" 3 Java(TM) SE Runtime Environment (build 1.8.0_91-b14) 4 Java HotSpot(TM) 64- ...