RestOperations使用建议

RestOperations

• RestOperations
  • MultiValueMap
  • Map/Object(canSerializable)
  • Service provider-Pafa3
  • consumer

some advices about ESG provider and consumer

public <T> T postForObject(String url, Object request, Class resultClass);

MultiValueMap

MultiValueMap param = new LinkedMultiValueMap();
param.add("k1", "v1");
param.add("k2", "v2");
param.add("k2", "v2v2");
param.add("k3", "v3");

// FormHttpMessageConverter
setContentType("application/www-form-data-urlencode")

// k1=v1&k2=v2&k2=v2v2&k3=v3

// controller
request.getParameter(String name);
request.getParameterMap();

Map/Object(canSerializable)

RestTemplate will converte request object to JSON

setContentType("application/json")

With Spring MVC @RequestBody annotation in controller method(handler), Spring MVC GsonHttpMessageConverter or GsonHttpMessageConverter etc.

// for controller method parameter annotated with RequestBody
Object body = readFromBodyInputStream(request);

Service provider-Pafa3

No HttpMessageConverter for Pafa3, so we can only use HttpServletRequest#getParameter to get parameter or read request body by HttpServletRequest#getInputStream.

But some one did some stupid things, es: SalesEsgFilter, they read the input stream, to do some customized operations such as checking the sign(is it necessary?), and controller can not get input stream anymore.

If still want to check sign in Filter, take this solution:

public class JsonBodyHttpServletRequestWrapper extends HttpServletRequestWrapper {

    private Map<String, Object> jsonParam;

    public JsonBodyHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
    }

    public JsonBodyHttpServletRequestWrapper(HttpServletRequest request, Map<String, Object> jsonParam) {
        super(request);
        this.jsonParam = jsonParam;
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        // TODO: 2018/4/5 与 getReader 只能调用一次
        return null;
    }

    @Override
    public BufferedReader getReader() throws IOException {
        // TODO: 2018/4/5
        return null;
    }
}

or move JSON parameters to HttpServletRequest#getParameter, over ride getParameter, getParameterMap, etc method.

consumer

depend on the way provider get parameter.
HttpServletRequest#getParameter: MultiValueMap
@RequestBody: Map or other can serializable object