Android-用httpurlconnection来实现网络请求以及json解析

发送get请求

 private void requestDataByGet() {
        try {
            URL url = new URL("http://www.imooc.com/api/teacher?type=2&page=1");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setConnectTimeout(30*1000);
            connection.setRequestMethod("GET");
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("Charset", "UTF-8");
            connection.setRequestProperty("Accept-Charset", "UTF-8");
            connection.connect(); // 发起连接

            int responseCode = connection.getResponseCode();
            String reponseMessage = connection.getResponseMessage();

            if(responseCode == HttpURLConnection.HTTP_OK){
                InputStream inputStream = connection.getInputStream();
                mResult = streamToString(inputStream);

                //跳回主线程
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        mResult = decode(mResult);
                        mTextView.setText(mResult);
                    }
                });


            } else {
                // TODO: error fail

                Log.e(TAG, "run: error code:" +responseCode +", message:" + reponseMessage);
            }

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

发送post请求：

   private void requestDataByPost() {
        try {
            // ?type=2&page=1
            URL url = new URL("http://www.imooc.com/api/teacher");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setConnectTimeout(30*1000);
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("Charset", "UTF-8");
            connection.setRequestProperty("Accept-Charset", "UTF-8");

            connection.setDoOutput(true);
            connection.setDoInput(true);

            connection.setUseCaches(false);
            connection.connect(); // 发起连接

            String data = "username=" + getEncodeValue("imooc") + "&number=" + getEncodeValue("150088886666");

            OutputStream outputStream = connection.getOutputStream();
            outputStream.write(data.getBytes());
            outputStream.flush();
            outputStream.close();

            int responseCode = connection.getResponseCode();
            String reponseMessage = connection.getResponseMessage();

            if(responseCode == HttpURLConnection.HTTP_OK){
                InputStream inputStream = connection.getInputStream();
                mResult = streamToString(inputStream);

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        mResult = decode(mResult);
                        mTextView.setText(mResult);
                    }
                });


            } else {
                // TODO: error fail

                Log.e(TAG, "run: error code:" +responseCode +", message:" + reponseMessage);
            }

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

//对发送的信息封装
 private String getEncodeValue(String imooc) {

        String encode = null;
        try {
            encode = URLEncoder.encode(imooc, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return encode;
    }

 将输入流解析成字符串

/**
     * 将输入流转换成字符串
     *
     * @param is 从网络获取的输入流
     * @return 字符串
     */
    public String streamToString(InputStream is) {
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len;
            while ((len = is.read(buffer)) != -1) {
                baos.write(buffer, 0, len);
            }
            baos.close();
            is.close();
            byte[] byteArray = baos.toByteArray();
            return new String(byteArray);
        } catch (Exception e) {
            Log.e(TAG, e.toString());
            return null;
        }
    }

解析JSON数据：

JSONOBJECT指的是用大括号括起来的，JSONArray指的是用中括号括起来的【】.

 映射json：

public class LessonResult {
    private int mStatus;
    private List<Lesson> mLessons;

    public int getStatus() {
        return mStatus;
    }

    public void setStatus(int status) {
        mStatus = status;
    }

    public List<Lesson> getLessons() {
        return mLessons;
    }

    public void setLessons(List<Lesson> lessons) {
        mLessons = lessons;
    }

    @Override
    public String toString() {
        return "LessonResult{" +
                "mStatus=" + mStatus +
                ", mLessons=" + mLessons +
                '}';
    }

    public static class Lesson{
        private int mID;
        private int mLearnerNumber;
        private String mName;
        private String mSmallPictureUrl;
        private String mBigPictureUrl;
        private String mDescription;

        public int getID() {
            return mID;
        }

        public void setID(int ID) {
            mID = ID;
        }

        public int getLearnerNumber() {
            return mLearnerNumber;
        }

        public void setLearnerNumber(int learnerNumber) {
            mLearnerNumber = learnerNumber;
        }

        public String getName() {
            return mName;
        }

        public void setName(String name) {
            mName = name;
        }

        public String getSmallPictureUrl() {
            return mSmallPictureUrl;
        }

        public void setSmallPictureUrl(String smallPictureUrl) {
            mSmallPictureUrl = smallPictureUrl;
        }

        public String getBigPictureUrl() {
            return mBigPictureUrl;
        }

        public void setBigPictureUrl(String bigPictureUrl) {
            mBigPictureUrl = bigPictureUrl;
        }

        public String getDescription() {
            return mDescription;
        }

        public void setDescription(String description) {
            mDescription = description;
        }

        @Override
        public String toString() {
            return "Lesson{" +
                    "mID=" + mID +
                    ", mLearnerNumber=" + mLearnerNumber +
                    ", mName='" + mName + '\'' +
                    ", mSmallPictureUrl='" + mSmallPictureUrl + '\'' +
                    ", mBigPictureUrl='" + mBigPictureUrl + '\'' +
                    ", mDescription='" + mDescription + '\'' +
                    '}';
        }
    }
}

处理json数据：

 private void handleJSONData(String result) {
        try {

            LessonResult lessonResult = new LessonResult();

            JSONObject jsonObject = new JSONObject(result);
            List<LessonResult.Lesson> lessonList = new ArrayList<>();
            int status = jsonObject.getInt("status");
            JSONArray lessons = jsonObject.getJSONArray("data");//读data数组

            lessonResult.setStatus(status);

            if(lessons != null && lessons.length() > 0){
                for (int index = 0; index < lessons.length(); index++) {
                    JSONObject lesson = (JSONObject) lessons.get(index);//一个大括号item
                    int id = lesson.getInt("id");
                    int learner = lesson.getInt("learner");
                    String name = lesson.getString("name");
                    String smallPic = lesson.getString("picSmall");
                    String bigPic = lesson.getString("picBig");
                    String description = lesson.getString("description");
                    
                    //赋值
                    LessonResult.Lesson lessonItem = new LessonResult.Lesson();
                    lessonItem.setID(id);
                    lessonItem.setName(name);
                    lessonItem.setSmallPictureUrl(smallPic);
                    lessonItem.setBigPictureUrl(bigPic);
                    lessonItem.setDescription(description);
                    lessonItem.setLearnerNumber(learner);
                    lessonList.add(lessonItem);
                }
                lessonResult.setLessons(lessonList);
            }

            mTextView.setText(lessonResult.toString());

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

现在有gson等第三方库来解析json。

 ——来自慕课网

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