In this post under Apache Commons IO, I will show with example how to write String data to an output stream. The Apache Commons IO library, provides a overloaded static method “write” under “IOUtils” class. We can use this method to write String data to an output stream. Its just a one line of code.…… Continue reading Writing String data to an output stream
Month: May 2025
postForLocation example
In this post under Spring RestTemplate, I will explain with example the purpose of “postForLocation” method in “RestTemplate” class. The “postForLocation” method is similar to “postForObject” both are used to perform a POST request. The only difference is “postForLocation” method returns a url which points to the location where the newly created resource can be…… Continue reading postForLocation example
InheritInverseConfiguration annotation example
In this post under MapStruct I will explain with example the purpose of “InheritInverseConfiguration” annotation. Lets say you have Mapper interface that has declared a method whose purpose is to map properties of “Student” to properties of “StudentDTO”. You have used “@Mapping” annotation on the method to tell MapStruct how to map property that differ…… Continue reading InheritInverseConfiguration annotation example
Reading file contents as a List of Strings
In this post under Apache Commons IO, I will show with example how to read file contents into a List of Strings. To implement this requirement, the library class “IOUtils” provide with a method named “readLines” This method takes a “FileReader” instance as an argument and return a list of Strings, where each String represents…… Continue reading Reading file contents as a List of Strings
postForObject example
In this post under Spring RestTemplate, I will show with example to make a POST http request. To make a POST http request, Spring RestTemplate framework provides “postForObject” method in “RestTemplate” class. This method takes 3 arguments, which are1) url2) Object to be posted3) Response type Below is the complete main code for your reference.…… Continue reading postForObject example
Adding callback methods in java interface class used as Mapper interface
In previous post under MapStruct I showed with example how to add callback methods in abstract class used as Mapper interface. In this post I will show with example how to add callback methods in interface used as Mapper Interface. For our example I will take the below Pojo class Student package package19; public class…… Continue reading Adding callback methods in java interface class used as Mapper interface
Adding callback methods in abstract class used as Mapper interface
In this post under MapStruct, I will show with example how to add callback methods which will be executed before and after mapping, in abstract class used as Mapper interface. We use two annotations “@BeforeMapping” and “@AfterMapping” to annotate methods which will be called before and after mapping. Lets say for example I have to…… Continue reading Adding callback methods in abstract class used as Mapper interface
Query Parameter example
In this post under Spring RestTemplate, I will show with example how to pass query paramter. For our example I will perform a GET http request on url “http://jsonplaceholder.typicode.com/posts” with “userId” as query parameter. I will create a url template and then create a map which will contain an entry where key will be “userId”…… Continue reading Query Parameter example
delete example
In this post under Spring RestTemplate, I will show with example how to perform DELETE Http request. To perform DELETE http request, we call “delete” method of “RestTemplate”. This method takes only the url with parameter map as optional. Below is the complete main code for your reference Main class package package3; import org.springframework.web.client.RestTemplate; public…… Continue reading delete example
Using Abstract class as Mapper interface
In this post under MapStruct, I will show with example how to use java abstract class as Mapper interface. In all my previous posts under MapStruct, I have shown you how to create Mapper interface (interface annotated with @Mapper annotation) using java interface. In this class I will use java abstract class to define the…… Continue reading Using Abstract class as Mapper interface
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