1、new一個RestTemplate：

SimpleClientHttpRequestFactory httpRequestFactory = new SimpleClientHttpRequestFactory();
httpRequestFactory.setReadTimeout(35000);
httpRequestFactory.setConnectTimeout(5000);
RestTemplate restTemplate = new RestTemplate(httpClientFactory);

2、重新設定restTemplate的messageConverters，否則用的預設的messageConverters。

List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
        messageConverters.add(new ByteArrayHttpMessageConverter());
        /** 解決亂碼的converter */
        StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter(Charset.forName
                ("UTF-8"
 
));
        messageConverters.add(stringHttpMessageConverter);
        messageConverters.add(new ResourceHttpMessageConverter());
        messageConverters.add(new SourceHttpMessageConverter());
        messageConverters.add(new AllEncompassingFormHttpMessageConverter());
        RestTemplate restTemplate = new
 
 RestTemplate(httpClientFactory);
        restTemplate.setMessageConverters(messageConverters);