首先創(chuàng)建OAuth 2.0 客戶端 ID

配置url，必須是https的，同時復制好客戶端id 和密鑰

配置回調(diào)url

    /**
     * Google授權(quán)登錄跳轉(zhuǎn)。但是會重定向，建議前端跳轉(zhuǎn)
     *
     * 前端js
     * // 構(gòu)建 Google 授權(quán) URL
     * const authParams = new URLSearchParams({
     *   response_type: 'code', //固定
     *   client_id: 'YOUR_CLIENT_ID', // 請將 YOUR_CLIENT_ID 替換為實際的客戶端 ID
     *   scope: 'openid email profile',  //固定
     *   redirect_uri: 'YOUR_REDIRECT_URI', // 在Google配置的回調(diào)url
     * });
     *
     * const authUrl = `https://accounts.google.com/o/oauth2/v2/auth?${authParams}`;
     *
     通過Java接口跳轉(zhuǎn)Google登錄頁面，會重定向，建議前端跳轉(zhuǎn)
     * @param response
     * @return
     * @throws IOException
     */
    @GetMapping("/google-login")
    @NoAuth
    public CommonResult<String> googleLogin(HttpServletResponse response) throws IOException {
        HttpTransport httpTransport = new NetHttpTransport();
        JsonFactory jsonFactory = GsonFactory.getDefaultInstance();

        // 設(shè)置 OAuth 2.0 授權(quán)碼流對象
        AuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
                httpTransport, jsonFactory, CLIENT_ID, CLIENT_SECRET, SCOPES)
                .setAccessType("offline")
                .setApprovalPrompt("force") // 可選，強制用戶重新授權(quán)
                .build();

        // 生成用戶授權(quán)的 URL
        AuthorizationCodeRequestUrl authorizationUrl = flow.newAuthorizationUrl()
                .setRedirectUri(REDIRECT_URI);

        // 重定向用戶到授權(quán) URL
        response.sendRedirect(authorizationUrl.build());
        return new CommonResult("success");
    }

回調(diào)接口文章來源地址http://www.zghlxwxcb.cn/news/detail-631809.html

 @GetMapping("/google-callback")
    @NoAuth //不需要登錄
    public ResponseEntity<String> googleCallback(@RequestParam("code") String authorizationCode) throws IOException {
        System.out.println("google-callback code = "+authorizationCode);

        // 創(chuàng)建 Google 授權(quán)碼流對象
        GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
                new NetHttpTransport(),
                JacksonFactory.getDefaultInstance(),
                CLIENT_ID,
                CLIENT_SECRET,
                Arrays.asList("openid", "email", "profile"))
                .setAccessType("offline")
                .build();

        // 交換授權(quán)碼為訪問令牌
        TokenResponse tokenResponse = flow.newTokenRequest(authorizationCode)
                .setRedirectUri(REDIRECT_URI)
                .execute();
        String accessToken = tokenResponse.getAccessToken();

//        System.out.println("google accessToken: "+accessToken);

        String userInfo = getUserInfo(accessToken);
//        System.out.println("userInfo: "+userInfo);
        /** 格式
         * {
         *   "iss": "https://accounts.google.com",
         *   "sub": "123456789012345678901",  表示用戶的唯一標識符，通常是用戶的Google ID。
         *   "aud": "your-client-id",
         *   "email": "user@example.com",
         *   "email_verified": true,
         *   "exp": 1627889766,
         *   "iat": 1627886166
         * }
         */
        JSONObject jsonObject = JSONObject.parseObject(userInfo);
        String email =  jsonObject.getString("email") ;
        //登錄邏輯
        JSONObject userJson = loginByEmail(email);
        String redirectUrl = "https://funflixvideo.com/#/?userId="+userJson.getString("userId")+"&sessionId="+userJson.getString("sessionId");
        // 重定向到 H5 頁面，并帶上 session ID
        HttpHeaders headers = new HttpHeaders();
        headers.setLocation(URI.create(redirectUrl));
        return new ResponseEntity<>(headers, HttpStatus.FOUND);
    }
    
    //獲取用戶信息
 public  String getUserInfo(String accessToken) {

        String url = "https://www.googleapis.com/oauth2/v1/userinfo?access_token=" + accessToken;
        try {
            return HttpClient4Utils.httpGet(url, null, "utf-8", 30);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

到了這里，關(guān)于Java實現(xiàn)Google授權(quán)登錄，OAuth 2.0登錄的文章就介紹完了。如果您還想了解更多內(nèi)容，請在右上角搜索TOY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！