小程序获取token的两种方式

注意：使用RestTemplate需要注入

@Qualifier：根据名称注入

@Configuration
public class RestConfig {
    
    @Bean
    public RestTemplate restTemplateSimple() {
        return new RestTemplate();
    }
}

public static String encoding = "UTF-8";

    @Autowired
    private WeChatConfig weChatConfig;
    private static WeChatConfig weChatConfigStatic;

    @Qualifier("restTemplateSimple")
    @Autowired
    private RestTemplate restTemplateSimple;
    private static RestTemplate restTemplateStatic;

    @PostConstruct
    private void init() {
        weChatConfigStatic = this.weChatConfig;
        restTemplateStatic = this.restTemplateSimple;
    }

    private static final OkHttpClient client = new OkHttpClient();

方式一：

public static String getAccessToken() {
        HttpUrl.Builder urlBuilder = HttpUrl.parse(WeChatConstant.WEI_XIN_API_URL).newBuilder();
        urlBuilder.addQueryParameter("grant_type", weChatConfigStatic.getClientCredential());
        urlBuilder.addQueryParameter("appid", weChatConfigStatic.getAppId());
        urlBuilder.addQueryParameter("secret", weChatConfigStatic.getSecretKey());
        String url = urlBuilder.build().toString();
        Request request = new Request.Builder()
                .url(url)
                .build();
        try {
            Response response = client.newCall(request).execute();
            if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
            String responseBody = response.body().string();
            JSONObject jsonObject = JSONObject.parseObject(responseBody);
            return jsonObject.getString("access_token");
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

方式二：

public static String getAccessToken2() {
        ResponseEntity<String> responseEntity = restTemplateStatic.getForEntity(WeChatConstant.ACCESS_TOKEN_URL, String.class, weChatConfigStatic.getAppId(), weChatConfigStatic.getSecretKey());
        log.info("获取wxToken结果集 {}", responseEntity);
        Map map = JSONObject.parseObject(responseEntity.getBody(), Map.class);
        if (!StringUtils.isEmpty(map.get("errcode"))) {
            throw new DefaultException("获取token参数有误");
        }
        if (!StringUtils.isEmpty(map.get("access_token"))) {
            return map.get("access_token").toString();
        } else {
            throw new DefaultException("获取token失败！");
        }
    }

grant_type：client_credential

常量

public static final String ACCESS_TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={appid}&secret={secret}";
public static final String WEI_XIN_API_URL = "https://api.weixin.qq.com/cgi-bin/token";