Android开发-网络通信1

使用 org.apache.http.client.HttpClient;

一开始从官网下载HttpClient 4.5：http://hc.apache.org/downloads.cgi ，解压之后添加到项目，添加 httppost.setEntity(entity) 后，一执行 httpclient.execute(post) 就报错，不添加还能正常Post。

查了不少 stackoverflow 的帖子，测试了无数方法，终于在十二小时后，发现了答案：http://stackoverflow.com/questions/29788479/android-httpclient-nosuchmethoderrororg-apache-http-entity-contenttype-create

1、要用 httpclient-android-4.3.5.1.jar ，而不是 httpclient-4.5.jar ，重点是 android ，不是版本；

2、要用 httpmime-4.3.6.jar ，而不是最新的 httpmime-4.5.jar 。上面 stackoverflow 的帖子说了，httpmime 和 httpclient-android 存在不兼容问题。

3、MultipartEntityBuilder ，而不是 MultipartEntity 。

代码参考 开源软件凡信：http://www.imgeek.org/forum.php?mod=viewthread&tid=763&extra=page%3D1

new Thread() {

        @SuppressWarnings("rawtypes")
        public void run() {
            HttpClient client = new DefaultHttpClient();

            MultipartEntityBuilder entity = MultipartEntityBuilder.create()
                    .setMode(HttpMultipartMode.BROWSER_COMPATIBLE);

            Set keys = map.keySet();
            if (keys != null) {
                Iterator iterator = keys.iterator();
                while (iterator.hasNext()) {
                    String key = (String) iterator.next();
                    String value = (String) map.get(key);
                    if (key.equals("file")) {
                        File file = new File(value);
                        entity.addPart(key, new FileBody(file));
                    } else {

                        try {
                            entity.addPart(key, new StringBody(value,
                                    Charset.forName("UTF-8")));
                        } catch (UnsupportedEncodingException e) {
                            e.printStackTrace();
                        }
                    }
                }

            }
            // 如果包含数组，要把包含的数组放进去，项目目前只有members这个数组，所有固定键值，为了更灵活
            // 可以将传入自定义的键名......
            if (has_Array) {
                for (int i = 0; i < members.size(); i++) {

                    try {
                        entity.addPart(
                                "members[]",
                                new StringBody(members.get(i), Charset
                                        .forName("UTF-8")));
                    } catch (UnsupportedEncodingException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }

            client.getParams().setParameter(
                    CoreConnectionPNames.CONNECTION_TIMEOUT, 30000);
            // 请求超时
            client.getParams().setParameter(
                    CoreConnectionPNames.SO_TIMEOUT, 30000);
            /*HttpPost post = new HttpPost(url);
            post.setEntity(entity);*/

            HttpPost post = new HttpPost(url);
            post.setEntity(entity.build());

            Log.d("LoadDataFromServer","2");

            StringBuilder builder = new StringBuilder();
            try {
                Log.d("LoadDataFromServer","3");
                HttpResponse response = client.execute(post);
                Log.d("LoadDataFromServer","4");

                if (response.getStatusLine().getStatusCode() == 200) {
                    BufferedReader reader = new BufferedReader(
                            new InputStreamReader(response.getEntity()
                                    .getContent(), Charset.forName("UTF-8")));
                    for (String s = reader.readLine(); s != null; s = reader
                            .readLine()) {
                        builder.append(s);
                    }
                    String builder_BOM = jsonTokener(builder.toString());
                    System.out.println("返回数据是------->>>>>>>>"
                            + builder.toString());
                    try {
                        JSONObject jsonObject = new JSONObject();
                        jsonObject = JSONObject.parseObject(builder_BOM);
                        Message msg = new Message();
                        msg.what = 111;
                        msg.obj = jsonObject;
                        handler.sendMessage(msg);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                }

            } catch (ClientProtocolException e) {
                e.printStackTrace();

            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }.start();