How to Use Basic Authentication for Rest Template

How to Use Basic Authentication for Rest Template

In this post, I will show how to use Rest Template to consume RESTful API secured with Basic Authentication. As part of this post, I will show how to build a REST API that is secured with Basic Authentication.

In this post, I will show how to use Rest Template to consume RESTful API secured with Basic Authentication. As part of this post, I will show how to build a REST API that is secured with Basic Authentication.

Overview

Basic Authentication is one of the mechanisms that you can use to secure your REST API. In my previous post, I showed how to secure REST API with Json Web Token.

Secure a REST API with Basic Authentication

Configure a REST API

Firstly, we will show a simple REST API to create users or retrieve users from the database. Then, we will secure this REST API with a Basic Authentication mechanism. Lastly, we will show how to use Basic Authentication with Rest Template to call this REST API.

Our REST controller class for this API to create or retrieve users will look like below:

package com.betterjavacode.restdemo.controllers;

import com.betterjavacode.restdemo.dto.UserDto; 
import com.betterjavacode.restdemo.managers.UserManager; 
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.HttpStatus; 
import org.springframework.http.MediaType; 
import org.springframework.http.ResponseEntity; 
import org.springframework.web.bind.annotation.*; 
import java.util.List; 
@RestController 
public class UserController 
{ 
    @Autowired 
    private UserManager userManager; 
    @RequestMapping(value = "/user/", method = RequestMethod.GET)
    public ResponseEntity> listAllUsers() 
    { 
       List users = userManager.getAllUsers(); 
       if(users.isEmpty()) 
       { 
           return new ResponseEntity>(HttpStatus.NO_CONTENT); 
       }
       return new ResponseEntity<>(users, HttpStatus.OK); 
    }
    @RequestMapping(value = "/user/{id}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE) 
    public ResponseEntity getUser(@PathVariable("id") long id) 
    { 
       UserDto userDto = userManager.getUser(id); 
       if(userDto == null) 
       { 
          return new ResponseEntity<>(HttpStatus.NOT_FOUND); 
       } 
       return new ResponseEntity<>(userDto, HttpStatus.OK); 
    } 
    @RequestMapping(value = "/user/", method= RequestMethod.POST) 
    public ResponseEntity createUser(@RequestBody UserDto userDto)
    { 
       UserDto user = userManager.createUser(userDto); 
       return new ResponseEntity<>(user, HttpStatus.OK); 
    } 
    @RequestMapping(value = "/user/{id}", method=RequestMethod.DELETE) 
    public ResponseEntity deleteUser(@PathVariable("id") long id) 
    { 
       UserDto user = userManager.getUser(id); 
       if(user == null) 
       { 
          return new ResponseEntity<>(HttpStatus.NOT_FOUND); 
       } 
       userManager.deleteUser(id); return new ResponseEntity<>(HttpStatus.NO_CONTENT); 
    } 
}

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