[Android]使用Spring for Android改善数据交互流程

public class RestTemplateManager {
    private static final int CONNECT_TIMEOUT = 30000;// 30秒
    private static final int READ_TIMEOUT = 15000;// 15秒
    private static final String TAG = "RestTemplateManager";
    private static SimpleClientHttpRequestFactory simpleFactory;
    private static HttpComponentsClientHttpRequestFactory httpComponentsFactory;
    private static HttpHeaders httpHeaders = new HttpHeaders();
    static {
        simpleFactory = new SimpleClientHttpRequestFactory();
        simpleFactory.setConnectTimeout(CONNECT_TIMEOUT);
        simpleFactory.setReadTimeout(READ_TIMEOUT);

        httpComponentsFactory = new HttpComponentsClientHttpRequestFactory();
        httpComponentsFactory.setConnectTimeout(CONNECT_TIMEOUT);
        httpComponentsFactory.setReadTimeout(READ_TIMEOUT);
    }

    /**
     * 请求头里面加入验证字符串
     * 
     * @param extra
     */
    public static void setHttpHeaders(String extra) {
        httpHeaders.add("verify", extra);
    }

    public static ClientHttpRequestFactory getResquestFactory() {
        // 当SDK版本号为大于2.3时
        if (Build.VERSION.SDK_INT >= 9) {
            return simpleFactory;
        }
        return httpComponentsFactory;
    }

    /**
     * POST请求
     * 
     * @param url
     * @param msg
     * @param clazz
     * @return
     */
    public static <R, M> R postJSON(String url, M msg, Class<R> clazz) {
        try {
            Log.v(TAG, url);
            httpHeaders.setContentType(MediaType.APPLICATION_JSON);
            HttpEntity<M> requestEntity = new HttpEntity<M>(msg, httpHeaders);
            RestTemplate restTemplate = new RestTemplate(getResquestFactory());
            ResponseEntity<R> response = restTemplate.exchange(url, HttpMethod.POST, requestEntity, clazz);
            return response.getBody();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static <R> R getJSON(String url, Class<R> clazz, Object... uriVariables) {
        try {
            url = spliceRestURL(url, uriVariables);
            Log.v(TAG, url);
            HttpEntity<?> requestEntity = new HttpEntity<Object>(httpHeaders);
            RestTemplate restTemplate = new RestTemplate(getResquestFactory());
            ResponseEntity<R> responseEntity = restTemplate.exchange(url, HttpMethod.GET, requestEntity, clazz,
                    uriVariables);
            return responseEntity.getBody();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 拼接rest风格的URL，注意参数的顺序
     */
    public static String spliceRestURL(String prefix, Object... params) {
        StringBuilder builder = new StringBuilder(prefix);
        for (Object p : params) {
            builder.append("/").append(p);
        }
        return builder.toString();
    }

}

    @RequestMapping(value = "login", method = RequestMethod.POST, produces = "application/json")
    @ResponseBody
    public MemberMessage login(@RequestBody LoginMessage message) {
        MemberMessage result = new MemberMessage();
        //登录过程处理.......
        return result;
    }