小程序后台代码提交，登录, 添加StringHttpMessageConverter

xueyi-modules/xueyi-system/src/main/java/com/xueyi/system/wechat/service/WeChatService.java

@@ -5,6 +5,7 @@ import com.xueyi.system.wechat.domain.bean.WeChatSessionResponse;
 import org.slf4j.Logger;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.converter.StringHttpMessageConverter;
 import org.springframework.stereotype.Service;
 import org.springframework.web.client.RestClientException;
 import org.springframework.web.client.RestTemplate;
@@ -44,6 +45,7 @@ public class WeChatService {
                 "&js_code=" + code +
                 "&grant_type=authorization_code";
         log.info("url: {}", url);
+        restTemplate.getMessageConverters().add(0, new StringHttpMessageConverter());
         try {
 
             WeChatSessionResponse sessionResponse = restTemplate.getForObject(url, WeChatSessionResponse.class);