网络操作-android网络操作
LessonResult.java ：
package com.imooc.demo; import java.util.ArrayList; import java.util.List; /** * Created by renkangke . */ public class LessonResult { private int mStatus; private List<Lesson> mLessons = new ArrayList<>(); 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; } public static class Lesson{ private int mID; private String mName; private String mSmallPictureUrl; private String mBigPictureUrl; private String mDescription; private int mLearnerNumber; public int getID() { return mID; } public void setID(int ID) { mID = ID; } 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; } public int getLearnerNumber() { return mLearnerNumber; } public void setLearnerNumber(int learnerNumber) { mLearnerNumber = learnerNumber; } @Override public String toString() { return "Lesson{" + "mID=" + mID + ", mName='" + mName + '\'' + ", mSmallPictureUrl='" + mSmallPictureUrl + '\'' + ", mBigPictureUrl='" + mBigPictureUrl + '\'' + ", mDescription='" + mDescription + '\'' + ", mLearnerNumber=" + mLearnerNumber + '}'; } } @Override public String toString() { return "LessonResult{" + "mStatus=" + mStatus + ", mLessons=" + mLessons + '}'; } }
MainActivity.java ：
package com.imooc.demo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } }
package com.imooc.demo; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.text.TextUtils; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.TextView; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.Reader; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLEncoder; import java.util.ArrayList; import java.util.List; /** * Function: * * @author Conquer * @version 1.0 */ public class NetworkActivity extends AppCompatActivity implements View.OnClickListener { private TextView mTextView; private Button mButton; private static final String TAG = "NetworkActivity"; private String mResult; private Button mParseDataButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_network); findViews(); setListeners(); } private void findViews() { mTextView = findViewById(R.id.textView); mButton = findViewById(R.id.getButton); mParseDataButton = findViewById(R.id.parseDataButton); } private void setListeners() { mButton.setOnClickListener(this); mParseDataButton.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.getButton: new Thread(new Runnable() { @Override public void run() { String urlString = "http://www.imooc.com/api/teacher?type=2&page=1"; mResult = requestDataByGet(urlString); runOnUiThread(new Runnable() { @Override public void run() { mResult = decode(mResult); mTextView.setText(mResult); } }); } }).start(); break; case R.id.parseDataButton: if (!TextUtils.isEmpty(mResult)) { handleJSONData(mResult); } break; } } private void handleJSONData(String json) { try { JSONObject jsonObject = new JSONObject(json); LessonResult lessonResult = new LessonResult(); List<LessonResult.Lesson> lessonList = new ArrayList<>(); int status = jsonObject.getInt("status"); JSONArray lessons = jsonObject.getJSONArray("data"); if (lessons != null && lessons.length() > 0) { for (int index = 0; index < lessons.length(); index++) { JSONObject item = (JSONObject) lessons.get(0); int id = item.getInt("id"); String name = item.getString("name"); String smallPic = item.getString("picSmall"); String bigPic = item.getString("picBig"); String description = item.getString("description"); int learner = item.getInt("learner"); LessonResult.Lesson lesson = new LessonResult.Lesson(); lesson.setID(id); lesson.setName(name); lesson.setSmallPictureUrl(smallPic); lesson.setBigPictureUrl(bigPic); lesson.setDescription(description); lesson.setLearnerNumber(learner); lessonList.add(lesson); } lessonResult.setStatus(status); lessonResult.setLessons(lessonList); mTextView.setText("data is : " + lessonResult.toString()); } } catch (JSONException e) { e.printStackTrace(); } } private String requestDataByGet(String urlString) { String result = null; try { URL url = new URL(urlString); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setConnectTimeout(30000); connection.setRequestMethod("GET"); // GET POST connection.setRequestProperty("Content-Type", "application/json"); connection.setRequestProperty("Charset", "UTF-8"); connection.setRequestProperty("Accept-Charset", "UTF-8"); connection.connect(); int responseCode = connection.getResponseCode(); if (responseCode == HttpURLConnection.HTTP_OK) { InputStream inputStream = connection.getInputStream(); result = streamToString(inputStream); } else { String responseMessage = connection.getResponseMessage(); Log.e(TAG, "requestDataByPost: " + responseMessage); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return result; } /** * 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; } } /** * 将Unicode字符转换为UTF-8类型字符串 */ public static String decode(String unicodeStr) { if (unicodeStr == null) { return null; } StringBuilder retBuf = new StringBuilder(); int maxLoop = unicodeStr.length(); for (int i = 0; i < maxLoop; i++) { if (unicodeStr.charAt(i) == '\\') { if ((i < maxLoop - 5) && ((unicodeStr.charAt(i + 1) == 'u') || (unicodeStr .charAt(i + 1) == 'U'))) try { retBuf.append((char) Integer.parseInt(unicodeStr.substring(i + 2, i + 6), 16)); i += 5; } catch (NumberFormatException localNumberFormatException) { retBuf.append(unicodeStr.charAt(i)); } else { retBuf.append(unicodeStr.charAt(i)); } } else { retBuf.append(unicodeStr.charAt(i)); } } return retBuf.toString(); } private String requestDataByPost(String urlString) { String result = null; try { URL url = new URL(urlString); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setConnectTimeout(30000); connection.setRequestMethod("POST"); // 设置运行输入,输出: connection.setDoOutput(true); connection.setDoInput(true); // Post方式不能缓存,需手动设置为false connection.setUseCaches(false); connection.connect(); // 我们请求的数据: String data = "username=" + URLEncoder.encode("imooc", "UTF-8") + "&number=" + URLEncoder.encode("15088886666", "UTF-8"); // 获取输出流 OutputStream out = connection.getOutputStream(); out.write(data.getBytes()); out.flush(); out.close(); int responseCode = connection.getResponseCode(); if (responseCode == HttpURLConnection.HTTP_OK) { InputStream inputStream = connection.getInputStream(); Reader reader = new InputStreamReader(inputStream, "UTF-8"); char[] buffer = new char[1024]; reader.read(buffer); result = new String(buffer); reader.close(); } else { String responseMessage = connection.getResponseMessage(); Log.e(TAG, "requestDataByPost: " + responseMessage); } final String finalResult = result; runOnUiThread(new Runnable() { @Override public void run() { mTextView.setText(finalResult); } }); connection.disconnect(); return result; } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } }
