Object search/registration via REST url and registration with SPRING

Question

I’m new to REST and Spring. I am doing an exercise where I have to search a client via url and return (GET) it in JSON format and insert(POST) a client in JSON format.

To search for sera in the model below, using GET:

http://localhost:8080/clientes/?nome=paulo

and return:

{
     "nome": "paulo",
     "cpf": 1231243434,
     "idade": 34,
     "sexo": M,
}

to insert into the template using POST:

{
     "nome": "paulo",
     "cpf": 1231243434,
     "idade": 34,
     "sexo": M,
}

This using only the memory of instantiated objects.

My classes:

Client

package model;
public class Cliente {

private String nome;
private String cpf;
private Integer idade;
private String sexo;

public Cliente(String nome, String cpf, Integer idade, String sexo) {
    this.nome = nome;
    this.cpf = cpf;
    this.idade = idade;
    this.sexo = sexo;
}

public String getNome() {
    return nome;
}

public void setNome(String nome) {
    this.nome = nome;
}

public String getCpf() {
    return cpf;
}

public void setCpf(String cpf) {
    this.cpf = cpf;
}

public Integer getIdade() {
    return idade;
}

public void setIdade(Integer idade) {
    this.idade = idade;
}

public String getSexo() {
    return sexo;
}

public void setSexo(String sexo) {
    this.sexo = sexo;
}

@Override
public String toString() {
    return "Cliente [nome=" + nome + ", cpf=" + cpf + ", idade=" +   idade + ", sexo=" + sexo + "]";
}
}

Clientecontroller

package controller;

import java.util.Hashtable;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import model.Cliente;
import service.ClienteService;

@RestController
@RequestMapping("/clientes")
public class ClienteController {


@Autowired
ClienteService cli;

@RequestMapping("/all")
public Hashtable<String, Cliente> getAll(){
    return cli.getAll();
}

//não esta buscando desta forma
@RequestMapping("{nome}")
public Cliente getCliente(@PathVariable("nome") String nome){   
    return cli.getCliente(nome);
}
}

Clienteservice

package service;
import java.util.Hashtable;
import org.springframework.stereotype.Service;
import model.Cliente;

@Service
public class ClienteService {
Hashtable<String, Cliente> clientes = new Hashtable<String, Cliente>      ();

public ClienteService(){

    Cliente c1 = new Cliente("paulo","123.123.123-22",28,"M");
    Cliente c2 = new Cliente("diego","123.123.123-22",24,"M");
    Cliente c3 = new Cliente("Debora","123.123.123-22",21,"F");

    clientes.put("1", c1);
    clientes.put("2", c2);
    clientes.put("3", c3);

}

public Cliente getCliente(String nome){
    if(clientes.containsKey(nome)){
        return clientes.get(nome);
    }else{
        return null;
    }

}
public Hashtable<String, Cliente> getAll(){
    return clientes;
}

}

So far I’ve been able to show all clients instantiated in JSON format, I’ve done some research and I’m not able to solve this.

Answer 1

Are you trying to make an appointment by query param (clientes?nome=paulo) but implemented a search for path param. (clientes/paulo)

Try changing your search to:

@RequestMapping(method = RequestMethod.GET)
public Cliente getCliente(@RequestParam("nome") String nome){   
    return cli.getCliente(nome);
}

And, taking advantage, correct your other query by removing the all at the end. In Rest good practices, when you call a resource without mentioning anything, you will be asking for all available resources. For this, change this way:

@RequestMapping(method = RequestMethod.GET)
public Hashtable<String, Cliente> getAll(){
    return cli.getAll();
}

And just do:

http://localhost:8080/clientes/

To return all customers

Answer 2

Take a look at the documentation but to get a parameter it uses the Annotation @Requestparam.

Documentation: http://docs.spring.io/spring/docs/3.1.x/spring-framework-reference/htmlsingle/spring-framework-reference.html#mvc-Ann-requestparam

@RequestMapping(method = RequestMethod.GET) public String setupForm(@RequestParam("petId") int petId, ModelMap model) { Pet pet = this.clinic.loadPet(petId); model.addAttribute("pet", pet); return "petForm"; }

Answer 3

Hello, young man!

You are using "@Pathvariable" instead of "@Requestparam". If you’re going to use it like that, the code should look like this:

@RequestMapping(value = "/{nome}", method = RequestMethod.GET)
public Cliente getCliente(@PathVariable("nome") String nome){   
    return cli.getCliente(nome);
}

Then you will have to give the GET through the URI:

http://localhost:8080/clientes/paulo

There are other ways to do this. If your intention is just to search by name only, you can attack like this:

@RequestMapping(method = RequestMethod.GET)
public Cliente getCliente(@RequestParam("nome") String nome){   
    return cli.getCliente(nome);
}

Or you can still strike like this:

@RequestMapping(method = RequestMethod.GET)
public Cliente getCliente(Cliente cliente){   
    return cli.getCliente(cliente.getNome());
}

For these two examples, Uri is the one you wrote:

http://localhost:8080/clientes?nome=paulo

In the second case, spring itself already takes care of transforming what you send to the customer. Since you will want to transition Client, you need to implement Serializable.

public class Cliente implements Serializable{
    private static final long serialVersionUID = 1L;

Any questions, just ask