How to bind request params without setters?

Question

I have a simple controller with a GET handler that accepts an object to bind request parameters:

@RestController
@RequestMapping(\"/test\")
public class Samp         


        

Answer 1

In addition to JSON annotations suggested by @jihor you can try to use custom Web Data binder, adding following code to your controller or to Controller Advice class to span functionality across multiple controllers.

@InitBinder
public void initBinder(WebDataBinder binder) {
    binder.initDirectFieldAccess();
}

Answer 2

Spring Boot libraries depend on Jackson (spring-boot-starter-web<-spring-boot-starter-json<-jackson libraries), so one can use its annotations to control json bindings.

@JsonCreator-annotated constructors or static methods allow to instantiate objects without explicit setters:

@JsonCreator
public RequestParams(@JsonProperty("param1") String param1, 
                     @JsonProperty("param2") String param2) {
    this.param1 = param1;
    this.param2 = param2;
}

Documentation

• https://fasterxml.github.io/jackson-annotations/javadoc/2.8/com/fasterxml/jackson/annotation/JsonCreator.html
• https://github.com/FasterXML/jackson-annotations/wiki