[FIXED] How to add HTTP lifecycle middleware handler to spring?

Issue

I have a CustomerController.java:

package com.satisfeet.http;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.satisfeet.core.model.Address;
import com.satisfeet.core.model.Customer;
import com.satisfeet.core.service.CustomerService;

@RestController
@RequestMapping("/customers")
public class CustomerController {

    @Autowired
    private CustomerService service;

    @RequestMapping(method = RequestMethod.GET)
    public Iterable<Customer> index() {
        return this.service.list();
    }

    @RequestMapping(method = RequestMethod.POST)
    public Customer create(@RequestBody Customer customer) {
        this.service.create(customer);

        return customer;
    }

    @RequestMapping(method = RequestMethod.GET, value = "/{id}")
    public Customer show(@PathVariable Integer id) {
        return this.service.show(id);
    }

    @RequestMapping(method = RequestMethod.PUT, value = "/{id}")
    public void update(@PathVariable Integer id, @RequestBody Customer customer) {
        this.service.update(id, customer);
    }

    @RequestMapping(method = RequestMethod.DELETE, value = "/{id}")
    public void destroy(@PathVariable Integer id) {
        this.service.delete(id);
    }

}

and a ExceptionController.java:

package com.satisfeet.http;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;

import com.satisfeet.core.exception.NotFoundException;

@ControllerAdvice
public class ExceptionController {

    @ExceptionHandler(NotFoundException.class)
    public ResponseEntity notFoundError() {
        return new ResponseEntity(HttpStatus.NOT_FOUND);
    }

}

I would now like to add some sort of HTTP request-response middleware which is executed before the response is written and write the HTTP status code in json:

HTTP/1.1 404 OK
Connection: close
Content-Type: application/json

{"error":"not found"}

I know how to convert a HttpStatus to a String but I do not know where I could do this globally with @ControllerAdvice.

So how do I register a global handler which has access to a response object?

Solution

i think what you are looking for is spring Interceptor .

please check this tutorial which is describing how to use interceptors .

and check spring documentation Intercepting requests with a HandlerInterceptor .

finally check this answer here

Hope that helps .

Answered By - user957654
Answer Checked By - Dawn Plyler (JavaFixing Volunteer)