springboot2.x实现oauth2授权码登陆

参考文章：
https://blog.csdn.net/qq_27828675/article/details/82466599

一 进行授权页

浏览器输入
http://localhost:8081/oauth/authorize?response_type=code&redirect_uri=http://localhost:8081/callback&client_id=android1&scop=all

二 使用资源站用户登陆

自动跨到资源登陆页，先登陆    

三 授权资源类型

登陆成功后，去授权你的资源，这些资源是在AuthorizationServerConfig.configure方法里配置的

@Override
public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
clients.inMemory()
.withClient(ClientID)
.secret(passwordEncoder.encode(ClientSecret))
.authorizedGrantTypes("authorization_code", "refresh_token",
"password", "implicit")
.scopes("read","write","del","userinfo")
.redirectUris(RedirectURLs);
}

四 接到code

授权之后，系统会重定向到你的redirect_uri这个页面，并带上唯一的code

五 获取access_token

我们拿着code就要再去授权服务器去获取token了，你可以在你的代码里写这个，也可以手动拿着code，去拼成一个url，再去拿token，就像这下面的实例。 注意向oauth/token发的是post请求，client_id和client_secret如果在url上传递，如果在AuthorizationServerConfig类的configure方法中开启allowFormAuthenticationForClients，代码如下

@Override
public void configure(AuthorizationServerSecurityConfigurer oauthServer) throws Exception {
oauthServer.tokenKeyAccess("permitAll()")
.checkTokenAccess("isAuthenticated()")
.allowFormAuthenticationForClients();//支持把secret和clientid写在url上，否则需要在头上
}

然后请求后给有下面的响应

Authorization Ccode------RFRLFY
access_token_url http://localhost:8081/oauth/token?client_id=android1&code=RFRLFY&grant_type=authorization_code&redirect_uri=http://localhost:8081/callback&client_secret=android1
Access Token Response ---------{"access_token":"faadf3bf-6488-4036-bc3b-21b0a979602c","token_type":"bearer","refresh_token":"1b01f133-c5ab-419f-8125-088c85916ecb","expires_in":43187,"scope":"read"}

回调页面代码，主要实现了对code的获取，对access_token的组织，然后请求时把access_token带上，这个方法一般会做成公用的过滤器

@Controller
public class UserController {
  @RequestMapping(value = "/callback", method = RequestMethod.GET)
  public ResponseEntity<String> callback(@RequestParam("code") String code) throws JsonProcessingException, IOException {
    ResponseEntity<String> response = null;
    System.out.println("Authorization Ccode------" + code);
    RestTemplate restTemplate = new RestTemplate();
    String access_token_url = "http://localhost:8081/oauth/token";
    access_token_url += "?client_id=android1&code=" + code;
    access_token_url += "&grant_type=authorization_code";
    access_token_url += "&redirect_uri=http://localhost:8081/callback";
    access_token_url += "&client_secret=android1";
    System.out.println("access_token_url " + access_token_url);
    response = restTemplate.exchange(access_token_url, HttpMethod.POST, null, String.class);
    ObjectMapper mapper = new ObjectMapper();
    JsonNode node = mapper.readTree(response.getBody());
    String token = node.path("access_token").asText(); System.out.println("access_token" +access_token);

    String url = "http://localhost:8081/index"; HttpHeaders headers1 = new HttpHeaders(); headers1.add("Authorization", "Bearer " + token); HttpEntity<String> entity = new HttpEntity<>(headers1); ResponseEntity<String> result = restTemplate.exchange(url, HttpMethod.GET, entity, String.class); return result; }

六 拿着access_token去请求具体的资源

可以在url地址上直接：http://localhost:8081/index?access_token=faadf3bf-6488-4036-bc3b-21b0a979602c