Android开发-网络通信2

调试了三种通信方法：HttpClient、AsyncHttpClient 和 Volley 。
HttpClient 测试代码[1]：

public class HttpUtil {

public static void sendRequestWithHttpClient(final String address, final List<NameValuePair> params, final HttpCallbackListener listener)
{
new Thread(new Runnable(){

@Override
public void run(){
try{

HttpPost httpPost= new HttpPost(address);

HttpClient httpClient = new DefaultHttpClient();
UrlEncodedFormEntity postEntity;
postEntity = new UrlEncodedFormEntity(params,"utf-8");
httpPost.setEntity(postEntity);
HttpResponse httpResponse = httpClient.execute(httpPost);
if(httpResponse.getStatusLine().getStatusCode() == 200)
{
HttpEntity reEntity=httpResponse.getEntity();
String reposnse = EntityUtils.toString(reEntity,"utf-8");
if(listener != null)
{
listener.onFinish(reposnse);
}
}

}catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}).start();
}

}

String usertel = et_usertel.getText().toString().trim();
String password = et_password.getText().toString().trim();

String url_login = "http://192.168.1.102:8999/weixin/index.php/Home/Index/test";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("usertel",usertel));
params.add(new BasicNameValuePair("password",password));

HttpUtil.sendRequestWithHttpClient(url_login,params,new HttpCallbackListener(){
@Override
public void onFinish(String response)
{
parseJSONWithJSONObject(response);
}

@Override
public void onError(Exception e)
{
e.printStackTrace();
}
});

private void parseJSONWithJSONObject(String jsonData){
try{
JSONArray jsonArray= new JSONArray(jsonData);
Log.d("com.dlwz.playfootball","in parseJSONWithJSONObject");

for(int i=0;i<jsonArray.length();i++)
{
JSONObject jsonObject = jsonArray.getJSONObject(i);
String name = jsonObject.getString("usertel");
String password = jsonObject.getString("password");
Log.d("com.dlwz.playfootball","name:"+name+",password:"+password);
dialog.dismiss();
startActivity(new Intent(LoginActivity.this,MainActivity.class));

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

AsyncHttpClient 测试代码[2] ：

RequestParams params = new RequestParams();
params.put("username", email);
params.put("password", password);
AsyncHttpClient client = new AsyncHttpClient();
client.get("http://192.168.1.102:8081/useraccount/login/dologin",params ,new AsyncHttpResponseHandler() {
// When the response returned by REST has Http response code '200'
@Override
public void onSuccess(String response) {
// Hide Progress Dialog
prgDialog.hide();
try {
// JSON Object
JSONObject obj = new JSONObject(response);
// When the JSON response has status boolean value assigned with true
if(obj.getBoolean("status")){
Toast.makeText(getApplicationContext(), "You are successfully logged in!", Toast.LENGTH_LONG).show();
// Navigate to Home screen
navigatetoHomeActivity();
}
// Else display error message
else{
errorMsg.setText(obj.getString("error_msg"));
Toast.makeText(getApplicationContext(), obj.getString("error_msg"), Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
Toast.makeText(getApplicationContext(), "Error Occured [Server's JSON response might be invalid]!", Toast.LENGTH_LONG).show();
e.printStackTrace();

}
}
// When the response returned by REST has Http response code other than '200'
@Override
public void onFailure(int statusCode, Throwable error,
String content) {
// Hide Progress Dialog
prgDialog.hide();
// When Http response code is '404'
if(statusCode == 404){
Toast.makeText(getApplicationContext(), "Requested resource not found", Toast.LENGTH_LONG).show();
}
// When Http response code is '500'
else if(statusCode == 500){
Toast.makeText(getApplicationContext(), "Something went wrong at server end", Toast.LENGTH_LONG).show();
}
// When Http response code other than 404, 500
else{
Toast.makeText(getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]", Toast.LENGTH_LONG).show();
}
}
});

Volley Post测试代码[3]：

RequestQueue mQueue = Volley.newRequestQueue(this);
StringRequest stringRequest = new StringRequest(Request.Method.POST,"http://192.168.1.102:8999/weixin/index.php/Home/Index/test",
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d("TAG-onResponse", response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("TAG-onErrorResponse", error.getMessage(), error);
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> map = new HashMap<String, String>();
map.put("username", "mabo@qq.com");
map.put("password", "123456");
return map;
}
};
mQueue.add(stringRequest);

 

 

参考资料：

1、类 HttpUtil 代码参考自《第一行代码 Android》第10章5小节，只是将 HttpURLConnection 换成了 HttpClient。parseJSONWithJSONObject 参考自该书 400 页。该书作者郭霖，csdn博客：http://blog.csdn.net/guolin_blog/ 。

2、该代码参考自 http://programmerguru.com/android-tutorial/android-restful-webservice-tutorial-how-to-call-restful-webservice-in-android-part-3/?utm_source=tuicool 。该文共三部分，通过演示一个包含前端后端的例子介绍了 Restful Webservice 在 Android 开发中的应用。当时调试时 Android 端没什么问题，照着一步步来就没错，但服务器端用 Eclipse EE 创建动态web，在运行时报了错，经调试发现是在 Class.forName(Constants.dbClass) 处报了错，String dbClass = "com.mysql.jdbc.Driver" ，下载了个com.mysql.jdbc.Driver 导入才成功。

3、该代码参考自《第一行代码 Android》作者郭霖的博客：http://blog.csdn.net/guolin_blog/article/details/17482095 。测试该代码遇到了几个问题：首先就是由于防火墙的原因，volley 无法用 Git 直接 clone ，不得不设置代理才成功下载。第二个问题是 volley 的 jar 包生成，网上有不少方法，但在我这没成功。比如 stormzhang 的命令行，郭霖的通过 eclipse 导出 jar 包，可能是由于版本更新的原因，这些方法都没行，后来还是用 Android Studio 顺利编译生成 jar 包。终于可以在工程中顺利使用。第三个问题就是我自己犯的低级错误，web服务端直接用了上面AsyncHttpClient 的服务端程序，Android 端 Post 数据过去，但我没注意到服务器端只能处理 get 的 url ，因为之前用ThinkPhp 时是不用区分 get 和 post 的，处理方式一样。没想到 java 端反而要区分，耗费了不少时间才查出来。