Android GSON使用POST方法

相逢意气为君饮，系马高楼垂柳边。这篇文章主要讲述Android GSON使用POST方法相关的知识，希望能为你提供帮助。
我有以下PostActivity.java文件，它使用Method.GET成功从php服务器获取数据，但我需要更改GSON的方法，使用Method.POST而不是Method.GET，这样我就可以发送两个参数（操作和用户（pid））到服务器如下：

{ "operation":"listApps", "user":{ "pid":"1" } }

【Android GSON使用POST方法】post activity.Java

import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.widget.ArrayAdapter; import android.widget.ListView; import com.android.volley.Request; import com.android.volley.RequestQueue; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.toolbox.StringRequest; import com.android.volley.toolbox.Volley; import com.google.gson.Gson; import com.google.gson.GsonBuilder; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; import java.util.List; import java.util.Map; public class PostActivity extends Activity {private static final String ENDPOINT = "http://www.locahost.com/api"; private RequestQueue requestQueue; private Gson gson; private List< String> posts_strs ; private List< Post> posts ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_post); requestQueue = Volley.newRequestQueue(getApplicationContext()); GsonBuilder gsonBuilder = new GsonBuilder(); gsonBuilder.setDateFormat("M/d/yy hh:mm a"); gson = gsonBuilder.create(); posts_strs = new ArrayList< String> (); fetchPosts(); }private void fetchPosts() { StringRequest request = new StringRequest(Request.Method.GET, ENDPOINT, onPostsLoaded, onPostsError); requestQueue.add(request); }private final Response.Listener< String> onPostsLoaded = new Response.Listener< String> () { @Override public void onResponse(String response) {posts = Arrays.asList(gson.fromJson(response, Post[].class)); ListView listview = (ListView) findViewById(R.id.postListView); for (Post post : posts) { posts_strs.add( post.ID + ": " + post.title); } ArrayAdapter< String> adapter = new ArrayAdapter< String> (PostActivity.this,R.layout.single_post_item,R.id.textView, posts_strs); listview.setAdapter(adapter); } }; private final Response.ErrorListener onPostsError = new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Log.e(PostActivity.class.getSimpleName(), error.toString()); } }; }

答案你必须更新StringRequest方法的fetchPosts实例：

StringRequest request = new StringRequest(Request.Method.POST, ENDPOINT, onPostsLoaded, onPostsError) {@Override protected Map< String, String> getParams() { Map< String, String> params = new HashMap< String, String> (); params.put("operation", "listApps"); // Create a POJO matching user structure and serialize this object to JSON to send it params.put("user", "String matching format you want to send"); return params; } };

另一答案您可以使用以下代码，发送实体（java类），并返回实体（类）并将数据作为json发布到API

public class JsonRequest< T> extends Request< T> { private static final String TAG = "JsonRequestHelper"; private final Gson gson = new Gson(); private final Class< T> returnType; private final Object model; private final Map< String, String> headers; private final Response.Listener< T> listener; /** * Make a GET request and return a parsed object from JSON. * * @param urlURL of the request to make * @param returnType Relevant class object, for Gson's reflection * @param headersMap of request headers */ public JsonRequest(Integer httpVerb, String url, Class< T> returnType, Object model, Map< String, String> headers, Response.Listener< T> listener, Response.ErrorListener errorListener) { super(httpVerb, url, errorListener); this.returnType = returnType; this.model = model; this.headers = headers; this.listener = listener; }@Override public Map< String, String> getHeaders() throws AuthFailureError { return headers != null ? headers : super.getHeaders(); }public static Map< String, String> getMapFromEntity(Object entity) { try { Map< String, String> map = new HashMap< String, String> (); Field[] fields = entity.getClass().getFields(); for (Field f : fields) if (f != null & & f.getModifiers() == Modifier.PUBLIC) map.put(f.getName(), f.get(entity).toString()); return map; } catch (IllegalAccessException error) { Log.e(TAG, error.getMessage()); return null; } }@Override protected void deliverResponse(T response) { listener.onResponse(response); }@Override public String getBodyContentType() { return "application/json; charset=utf-8"; }@Override public byte[] getBody() { return gson.toJson(this.model).getBytes(); }@Override protected Response< T> parseNetworkResponse(NetworkResponse response) { try { String json = new String( response.data, HttpHeaderParser.parseCharset(response.headers)); return Response.success( gson.fromJson(json, returnType), HttpHeaderParser.parseCacheHeaders(response)); } catch (UnsupportedEncodingException e) { return Response.error(new ParseError(e)); } catch (JsonSyntaxException e) { return Response.error(new ParseError(e)); } } }