java - Spring-MVC & Android : Server gets a empty JSON string from android

Question

我正在开发一个 Android 项目，我想在其中创建一个到基于 Spring-MVC 的服务器的 RESTful POST 连接。我最初尝试发布一个对象，但经常遇到错误。这就是我尝试发送 JSON 对象的原因。目前我在 Android 应用程序中没有收到任何错误，但是当我收到 JSON 对象并获取字符串时，JSON 对象中没有任何内容。我调试了代码以查看值是否正确发送。我不知道我做错了什么。你能帮忙的话，我会很高兴。非常感谢。

发送对象的 Android 代码:

@Override
    public void addRestaurant(Restaurant restaurant) {
        Log.d("Restaurant Name",restaurant.getRestaurantName());
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                try {

                    Looper.prepare();
                    HttpClient client = new DefaultHttpClient();
                    HttpConnectionParams.setConnectionTimeout(client.getParams(),10000);
                    HttpResponse response;
                    JSONObject jsonObject = new JSONObject();

                    HttpPost post = new HttpPost(url);
                    jsonObject.put("restaurantName",restaurant.getRestaurantName());
                    jsonObject.put("postLeitZahl",restaurant.getPostLeitZahl());
                    jsonObject.put("phoneNumber",restaurant.getPhoneNumber());
                    jsonObject.put("id",restaurant.getId());

                    StringEntity stringEntity = new StringEntity(jsonObject.toString());
                    stringEntity.setContentType(new BasicHeader(HTTP.CONTENT_TYPE,"application/JSON"));
                    post.setEntity(stringEntity);
                    response = client.execute(post);

                } catch (Exception e){
                    e.printStackTrace();
                }
                Looper.loop();
                //String response = restTemplate.postForObject(url,restaurant,String.class);
                //Log.d(response,"Response from webserver is");
            }
        });
        thread.setPriority(Process.THREAD_PRIORITY_BACKGROUND);
        thread.start();
    }
}

Spring Controller 代码:

    @RequestMapping(value = "/restaurant/add",method = RequestMethod.POST,consumes="application/json")
    @ResponseBody
    public String addRestaurantWebView(JsonObject restaurant){
        System.out.println(restaurant.getAsString());
        return "true";
    }

我不知道我做错了什么，并且我无法找到一些可以告诉我如何根据 android 中的代码配置服务器的资源，反之亦然。非常感谢..:-)

编辑(解决方案)(部分Java对象)

由于我的初衷是发送一个失败的 Java 对象，所以我恢复为 JSON，但后来它与 Java 一起工作，这里是对我有用的 Android 代码和 Spring-MVC Controller 和 bean。

Android 代码:

package com.example.myapp;

import android.os.Process;
import android.util.Log;
import org.springframework.http.*;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.client.RestTemplate;

public class RestaurantServiceImpl  implements RestaurantService {

    String url = "http://192.168.178.40:8080/restaurant/add";

    @Override
    public void addRestaurant(Restaurant restaurant) {
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    RestTemplate restTemplate = new RestTemplate();
                    restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
                    HttpHeaders headers = new HttpHeaders();
                    headers.setContentType(MediaType.APPLICATION_JSON);
                    HttpEntity entity = new HttpEntity(restaurant,headers);
                    ResponseEntity<String> out = restTemplate.exchange(url, HttpMethod.POST,entity,String.class);
                    Log.d(out.toString(),"Response from server");
                } catch (Exception e){
                    e.printStackTrace();
                }
            }
        });
        thread.setPriority(Process.THREAD_PRIORITY_BACKGROUND);
        thread.start();
    }
}

Spring-MVC Controller :

 @RequestMapping(value = "/restaurant/add",method = RequestMethod.POST)
    @ResponseBody
    public String addRestaurantWebView(@RequestBody Restaurant restaurant){
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("restaurant", new Restaurant());
        modelAndView.addObject(restaurant);
        this.restaurantService.addRestaurant(restaurant);
        return "true";
    }

Servlet-context.xml

添加此:

<mvc:annotation-driven />

<beans:bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <beans:property name="messageConverters">
               <beans:ref bean="jsonMessageConverter"/>
        </beans:property>
    </beans:bean>

    <beans:bean id="jsonMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>

Answer 1

这就是我要做的:在 Spring 应用程序上创建 Restaurant 类。然后将其作为请求映射中的参数与@ModelAttribute一起使用:

public String addRestaurantWebView(@ModelAttribute Restaurant restaurant) {

然后，在 Android 上使用 MultipartEntity 发送参数:

Charset charset = Charset.forName("UTF-8");
MultipartEntity entity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE, null, charset);
entity.addPart("restaurantName", new StringBody(restaurant.getRestaurantName(), charset));
entity.addPart("postLeitZahl", new StringBody(restaurant.getPostLeitZahl(), charset));
entity.addPart("phoneNumber", new StringBody(restaurant.getPhoneNumber(), charset));
entity.addPart("id", new StringBody(restaurant.getId(), charset));

HttpPost post = new HttpPost(url);
post.setEntity(entity);
response = client.execute(post);