使用SAE的服务来实现android端的用户反馈功能。

这篇是上个月在SAE论坛上写的，现在也转过来吧。

因为应用的需要在SAE开了个jvm来帮android端合并一些请求，提供一些查询和抓取服务。但是SAE的jvm比较贵，每个小时都要5云豆，所以就打算搞点其他的功能，搭建一个简单的服务端，根据需要添加其他功能。

首先想到写个用户反馈的功能，这里需要先在SAE应用里建立一个MySQL数据库，具体创建可以参考SAE的文档。

先是Android端提交数据的代码：

public class UserMessage extends Activity implements OnClickListener {
    private static final String TAG = UserMessage.class.getSimpleName();
    private EditText tvText, tvMail;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_gettext);
      tvText = (EditText) findViewById(R.id.user_text);
      tvMail = (EditText) findViewById(R.id.user_mail);
      Button button = (Button) findViewById(R.id.user_bt);
      button.setOnClickListener(this);
      TextView userInfo = (TextView) findViewById(R.id.user_info);
      userInfo.setText(getInfo());
    }
    // 获得机型、android版本、应用版本号
    private String getInfo() {
      PackageManager pManager = getPackageManager();
      PackageInfo pInfo = null;
      try {
        pInfo = pManager.getPackageInfo(getPackageName(), 0);
      } catch (NameNotFoundException e) {
        Log.e(TAG, "包名不存在");
        e.printStackTrace();
      }
      StringBuilder info = new StringBuilder();
      info.append("机型：" + android.os.Build.MODEL);
      info.append(" Android" + android.os.Build.VERSION.RELEASE);
      info.append(" 软件版本：" + pInfo.versionName);
      return info.toString();
    }
    @Override
    public void onClick(View v) {
      String text = tvText.getText().toString().trim();
      String mail = tvMail.getText().toString().trim();
      if (TextUtils.isEmpty(text)) {
        Toast.makeText(UserMessage.this, "内容不能为空", Toast.LENGTH_SHORT).show();
      } else {
        new SendMessageTask().execute(new String[] { mail, text });
}
    }
    class SendMessageTask extends AsyncTask<String, Integer, String> {
      protected String doInBackground(String... params) {
        // 用POST方式提交
        HttpPost httpRequest = new HttpPost("http://****.sinaapp.com/ReceiveMessage");
        ArrayList<NameValuePair> list = new ArrayList<NameValuePair>();
        list.add(new BasicNameValuePair("mail", params[0]));
        list.add(new BasicNameValuePair("text", params[1]));
        list.add(new BasicNameValuePair("info", getInfo()));
        String result = "";
        try {
            httpRequest.setEntity(new UrlEncodedFormEntity(list, HTTP.UTF_8));
            HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequest);
            // 获取返回的状态码
            if (httpResponse.getStatusLine().getStatusCode() == 200) {
              // 获取返回的信息
              result = EntityUtils.toString(httpResponse.getEntity());
            } else {
              result = "发送失败";
            }
        } catch (Exception e) {
            e.printStackTrace();
            return "发送失败";
        }
        return result;
      }
      protected void onPreExecute() {
        Toast.makeText(UserMessage.this, "正在发送中", Toast.LENGTH_SHORT).show();
      }
      protected void onPostExecute(String result) {
        Toast.makeText(UserMessage.this, result, Toast.LENGTH_SHORT).show();
      }
    }
}

下面是服务器端的代码：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
      request.setCharacterEncoding("UTF-8");
      response.setContentType("text/html;charset=UTF-8");
      String mail = request.getParameter("mail"); // 用户提交的联系方式
      String text = request.getParameter("text"); // 用户反馈的正文
      String info = request.getParameter("info"); // 机型、应用版本号等信息
      String results = writeData(mail, text, info) ? "提交成功" : "提交失败";
      response.getWriter().write(results);    // 返回结果
    }
    public boolean writeData(String mail, String text, String info) {
      String driver = "com.mysql.jdbc.Driver";
      String dbUrl = "jdbc:mysql://r.rdc.sae.sina.com.cn:3307/app_name";
      Connection connection = null;
      PreparedStatement ps = null;
      try {
        Class.forName(driver);// 加载
        // 连接数据库
        connection = DriverManager.getConnection(dbUrl, SaeUserInfo.getAccessKey(), SaeUserInfo.getSecretKey());
        // 获取当前的时间，一起写入数据库
        String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
        String sql = "insert into feedback (mail, text, time, info) values (?, ?, ?, ?)";
        ps = connection.prepareStatement(sql);
        ps.setString(1, mail);
        ps.setString(2, text);
        ps.setString(3, date);
        ps.setString(4, info);
        ps.execute();
        return true;
      } catch (SQLException e) {
        e.printStackTrace();
        return false;
      } catch (ClassNotFoundException e) {
        e.printStackTrace();
        return false;
      } finally {
        try {
            if (ps != null) {
              ps.close();
            }
            if (connection != null) {
              connection.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
      }
    }