spring boot: change print console to json rest - json

Question

Actually, my project in Spring send values from the database via console, like this:
Console image, but I want to send this values via JSON like a rest API, but I don't know how to change that.
{
"depositarios": {
"correo": "correo",
"nombre": "nombre",
"numTel": "numTel",
"pApellido": "pApellido",
"SApellido": "sAellido"
}
}
this is my main class:
#SpringBootApplication
#ComponentScan("com.abner.springpostgresql.service.impl, com.abner.springpostgresql.dao.imp")
public class SpringPostgresqlApplication {
public static void main(String[] args) {
ApplicationContext context= SpringApplication.run(SpringPostgresqlApplication.class, args);
depoService depoService =context.getBean(depoService.class);
depoService.loadAllDepo();
}
}
this is my entired project source https://github.com/abnercoronado/restpostgresql

Answer 1

You have to create a RestController using the #RestController annotation like this:
#RestController
public class MyRestController {
#RequestMapping(value = "/personas", method = RequestMethod.GET)
public List<Persona> listaPersonas() {
// This is just a sample. Here you could bring your data form your db
List<Persona> lista = new ArrayList<Persona>();
Persona p = new Persona();
p.setNombre("angel");
p.setEdad(20);
lista.add(p);
return lista;
}
}
The value of the #RequestMapping annotation ("/personas" in this example) will be the endpoint. So when you access to the endpoint http://localhost:8080/personas (asuming that your app is running on http://localhost:8080) then you will get your data as json.
Here is an example of how to do it.
Here is another example (en español) that could help you.

Answer 2

You can use ObjectMapper to convert your pojo or object to JSON String and send where ever you wanted using thier API or anything.
Or you can create Rest Method and Access the API would return you the Json Value.
#RestController
public class MyRestController {
#RequestMapping(value = "/depo", method = RequestMethod.GET)
public List<?> getDepo() {
ApplicationContext context= SpringApplication.run(SpringPostgresqlApplication.class, args);
depoService depoService =context.getBean(depoService.class);
List<?> lista = depoService.loadAllDepo();
return lista;
}
Another way of doing.
#RestController
public class MyRestController {
#RequestMapping(value = "/depo", method = RequestMethod.GET)
public List<Depo> getDepo() {
ApplicationContext context= SpringApplication.run(SpringPostgresqlApplication.class, args);
depoService depoService =context.getBean(depoService.class);
List<Depo> lista = depoService.loadAllDepo();
return lista;
}
Once you start your server, you can run this by doing localhost:8080/depo. you can also return XML.