Spring boot and Jackson ObjectMapper

Spring Boot supports integration with three JSON mapping libraries: Gson, Jackson, and JSON-B. Jackson is preferred and default. Jackson is part of the spring boot starter JSON, which is included in the spring boot starter web. In other words, when spring boot starter web is introduced into the project, spring boot starter JSON will be automat ...

Posted on Fri, 13 Dec 2019 15:21:41 -0500 by jcrocker

Android viewpager ad rotation, with sliding dots, inherited from pager adapter, native code, helps you understand ad rotation

Advertising rotation is actually inherited from the adapter. I use a thread to work with pictures to play continuously. When I press a finger with Boolean Boolean value, I use destroitem in the adapter to delete and add instantiateItem to adjust the pictures to prevent blank pages MainActivity class and logic are written in it ...

Posted on Fri, 13 Dec 2019 15:13:45 -0500 by findshorty

Download and decompress Android files

The previous version needs to download and extract files in the app background because it needs to do some pre loading functions. Now that the project is online, make a record here: There are many ways to download files. It seems that there are three ways in my app. The AsyncTask used here downloads the file and decompresses it ...

Posted on Fri, 13 Dec 2019 14:41:23 -0500 by PaulRyan

Activiti+webSocket+spring to push messages (one-to-one chat)

  Introduction: I tried to build this function while Cheng was learning. There may be many problems. I just want to make a record here. Code directly. If you don't understand, please contact the owner or add group 725395843. This is the technical discussion group. For discussion. Function purpose: Implementation page send m ...

Posted on Fri, 13 Dec 2019 14:35:56 -0500 by bhavesh

Global exception handling in springboot2 (including exceptions in interceptor)

Explain The reason for writing this article is that the global exception handling in the project is to discover that the exception in the custom interceptor was not caught by @ controlleradvise. In the project, @ ControllerAdvice is used to handle the exceptions in the controller. However, it is found that the exceptions thrown in the extensi ...

Posted on Fri, 13 Dec 2019 14:20:04 -0500 by seatoomol7

Shallow copy and deep copy of Java

Shallow copy and deep copy of Java case In recent projects, there is a module that needs to reconstruct the data structure. Convert the data of the database query into a nested map structure with specified format and sorting, as follows Due to a large number of duplicate structures in the data, combined with space complexity and time complexit ...

Posted on Fri, 13 Dec 2019 14:17:43 -0500 by mlpeters5403

Java dynamics - script engine executes javascript code

1. Script engine executes JavaScript code Introduction to script engineIt enables Java applications to interact with various script engines through a set of fixed interfaces, so as to call various script languages on the Java platform Java script API is a bridge between Java platform and script language We can hand over some complicated and ch ...

Posted on Fri, 13 Dec 2019 12:56:03 -0500 by ElizaLeahy

Instructions for using JSch to connect Sftp

Preface Recently, I need to pass SSH Then on SFTP Connect, and then operate, so record here, convenient for future use, also convenient for everyone as a reference. text First of all, you need to make a dependency reference to JSch, and the project is built by gradle. Here is the build.gradle Code: // https://mvnrepository.com/arti ...

Posted on Fri, 13 Dec 2019 12:41:36 -0500 by jrmckee

Spring Boot using Spring Data JPA

In this tutorial, you will see how Spring Data JPA provides complete abstraction on the DAO layer. We no longer need to write an implementation for the DAO layer; Spring Data auto generation implements the DAO implementation. Dependency configuration In this tutorial, I use MySQL databases with Spring Data. This is the build.gradle file: buil ...

Posted on Fri, 13 Dec 2019 11:32:24 -0500 by kellerkind

Three special classes of javaSE -- Object class

Object class (realfamily) -- highest parameter unification (all classes can be converted to object class upward) The Object class is a class provided by JDK by default. In Java, except for the Object class, all classes have inheritance relationships, and the Object parent class will be inherited by default toString() -- ge ...

Posted on Fri, 13 Dec 2019 11:19:15 -0500 by lulubell