REST Pagination in Spring
1. Overview This tutorial will focus on the implementation of pagination in a REST API, using Spring MVC and Spring Data. 2. Page as Resource vs […]
JAVA
Versioning a REST API
1. The Problem Evolving a REST API is a difficult problem – one for which many options are available. This article discusses some of these options. […]
Request Method Not Supported (405) in Spring
1. Overview This quick article is focused on a common error – ‘Request Method not Supported – 405′ – that developers face while exposing their APIs […]
Documenting a Spring REST API Using OpenAPI 3.0
1. Overview Documentation is an essential part of building REST APIs. In this tutorial, we’ll take a look at SpringDoc — a tool that simplifies […]
Setting Up Swagger 2 with a Spring REST API
1. Overview Nowadays, front-end and back-end components often separate a web application. Usually, we expose APIs as a back-end component for the front-end component or […]
Using Spring ResponseEntity to Manipulate the HTTP Response
1. Introduction Using Spring, we usually have many ways to achieve the same goal, including fine-tuning HTTP responses. In this short tutorial, we’ll see how […]
Using Spring @ResponseStatus to Set HTTP Status Code
1. Introduction In Spring MVC, we have many ways to set the status code of an HTTP response. In this short tutorial, we will see the […]
How to Read HTTP Headers in Spring REST Controllers
1. Overview In this quick tutorial, we’re going to look at how to access HTTP Headers in a Spring Rest Controller. First, we’ll be using the @RequestHeader annotation […]
Spring’s RequestBody and ResponseBody Annotations
1. Introduction In this quick tutorial, we provide a concise overview of the Spring @RequestBody and @ResponseBody annotations. 2. @RequestBody Simply put, the @RequestBody annotation maps the HttpRequest body to a transfer or domain object, […]
Entity To DTO Conversion for a Spring REST API
1. Overview In this tutorial, we’ll handle the conversions that need to happen between the internal entities of a Spring application and the external DTOs (Data Transfer […]
Error Handling for REST with Spring
1. Overview This tutorial will illustrate how to implement Exception Handling with Spring for a REST API. We’ll also get a bit of historical overview and see […]
The Spring @Controller and @RestController Annotations
1. Overview In this brief tutorial, we’ll discuss the difference between @Controller and @RestController annotations in Spring MVC. We can use the first annotation for traditional Spring controllers, and […]
Build a REST API with Spring and Java Config
1. Overview This article shows how to set up REST in Spring – the Controller and HTTP response codes, configuration of payload marshalling and content negotiation. 2. […]
Bootstrap a Web Application with Spring 5
1. Overview The tutorial illustrates how to Bootstrap a Web Application with Spring. We’ll look into the Spring Boot solution for bootstrapping the application and also […]
Extract links from an HTML page
1. Using javax.swing.text.html.HTMLEditorKit 2. Using an HTML parser In this HowTo, I will use the OpenSource package Jsoup. Done! Happy Coding!
Remove HTML tags from a file to extract only the TEXT
1. Using regular expression A special regular expression is used to strip out anything between a < and > However if any Javascript is present, […]
Explain about URL and HTTPS protocol
1. Resolve a relative URL 2. File size from URL 3. Use the HTTPS protocol For Applets, both IE and NN have implemented https in […]
Write/Read cookies using HTTP and Read a file from the internet
1. Write/Read cookies using HTTP 2. Read a file from the internet 3. Read a GIF or CLASS from an URL save it locally This […]
HTTP Authentification and CGI/Servlet
1. Identify yourself using HTTP Authentification A better alternative is the Authenticator class. NOTE: a simple explanation about the base64 encoding principle is shown in […]
Connect through a Proxy
1. The Networking Properties You have to set the following properties: NOTE: proxyHost, proxyPort are deprecated. you have to prefix them with “http.”.NOTE: Those properties are documented here: http://java.sun.com/javase/6/docs/technotes/guides/net/properties.htm. […]
