Android-非常棒的HTTP通讯总结
这里有一个非常棒的http通讯的总结，我看了以后茅塞顿开。
以下代码特别需要注意：在android 4.0后的系统不适用，会报错的，不能直接在UI线程中使用网络访问。
先贴代码：
public class Activity1 extends Activity {
private final String DEBUG_TAG = "System.out";
private TextView mTextView;
private Button mButton;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextView = (TextView) findViewById(R.id.TextView01);
mButton = (Button) findViewById(R.id.Button01);
mButton.setOnClickListener(new httpListener());
}
// 设置按钮监听器
class httpListener implements OnClickListener {
public void onClick(View v) {
refresh();
}
}
private void refresh() {
String httpUrl = "http://192.168.0.101:8080/Test/test.jsp";
// URL可以加参数
// String httpUrl =
// "http://192.168.0.101:8080/Test/test.jsp?par=abcdefg";
String resultData = "";
URL url = null;
try {
// 创建一个URL对象
url = new URL(httpUrl);
} catch (MalformedURLException e) {
Log.d(DEBUG_TAG, "create URL Exception");
}
// 声明HttpURLConnection对象
HttpURLConnection urlConn = null;
// 声明InputStreamReader对象
InputStreamReader in = null;
// 声明BufferedReader对象
BufferedReader buffer = null;
String inputLine = null;
if (url != null) {
try {
// 使用HttpURLConnection打开连接
urlConn = (HttpURLConnection) url.openConnection();
// 得到读取的内容(流)
in = new InputStreamReader(urlConn.getInputStream());
// 创建BufferReader对象，输出时候用到
buffer = new BufferedReader(in);
// 使用循环来读取数据
while ((inputLine = buffer.readLine()) != null) {
// 在每一行后面加上换行
resultData += inputLine + "\n";
}
// 设置显示取的的内容
if (resultData != null && !resultData.equals("")) {
mTextView.setText(resultData);
} else {
mTextView.setText("读取的内容为空");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
// 关闭InputStreamReader
in.close();
// 关闭URL连接
urlConn.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
} else {
Log.d(DEBUG_TAG, "URL is NULL");
}
}
}
第二种方式：
public class Activity2 extends Activity {
private final String DEBUG_TAG = "System.out";
private TextView mTextView;
private Button mButton;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextView = (TextView) findViewById(R.id.TextView01);
mButton = (Button) findViewById(R.id.Button01);
mButton.setOnClickListener(new httpListener());
}
// 设置按钮监听器
class httpListener implements OnClickListener {
public void onClick(View v) {
refresh();
}
}
private void refresh() {
String httpUrl = "http://192.168.0.101:8080/Test/test.jsp";
String resultData = "";
URL url = null;
try {
// 创建一个URL对象
url = new URL(httpUrl);
} catch (MalformedURLException e) {
Log.d(DEBUG_TAG, "create URL Exception");
}
// 声明HttpURLConnection对象
HttpURLConnection urlConn = null;
// 声明InputStreamReader对象
InputStreamReader in = null;
// 声明BufferedReader对象
BufferedReader buffer = null;
String inputLine = null;
// 声明DataOutputStream流
DataOutputStream out = null;
if (url != null) {
try {
// 使用HttpURLConnection打开连接
urlConn = (HttpURLConnection) url.openConnection();
// 因为这个是POST请求所以要设置为true
urlConn.setDoInput(true);
urlConn.setDoOutput(true);
// 设置POST方式
urlConn.setRequestMethod("POST");
// POST请求不能设置缓存
urlConn.setUseCaches(false);
urlConn.setInstanceFollowRedirects(false);
// 配置本次连接的Content-type，配置为application/x-www-form-urlencoded的
urlConn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
// 连接，从postUrl.openConnection()至此的配置必须要在connect之前完成
// 要注意的是connectio.getOutputStream会隐含的进行connect
urlConn.connect();
// DataOutputStream流
out = new DataOutputStream(urlConn.getOutputStream());
String content = "par=" + URLEncoder.encode("abcdefg", "gb2312");
// 将要上传的内容写入流中
out.writeBytes(content);
// 得到读取的内容(流)
in = new InputStreamReader(urlConn.getInputStream());
// 创建BufferReader对象，输出时候用到
buffer = new BufferedReader(in);
// 使用循环来读取数据
while ((inputLine = buffer.readLine()) != null) {
// 在每一行后面加上换行
resultData += inputLine + "\n";
}
// 设置显示取的的内容
if (resultData != null && !resultData.equals("")) {
mTextView.setText(resultData);
} else {
mTextView.setText("读取的内容为空");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
// 刷新DataOutputStream流
out.flush();
// 关闭DataOutputStream流
out.close();
// 关闭InputStreamReader
in.close();
// 关闭URL连接
urlConn.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
} else {
Log.d(DEBUG_TAG, "URL is NULL");
}
}
}
第三种方式：
public class Activity3 extends Activity{
private TextView mTextView;
private Button mButton;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextView = (TextView) findViewById(R.id.TextView01);
mButton = (Button) findViewById(R.id.Button01);
mButton.setOnClickListener(new httpListener());
}
// 设置按钮监听器
class httpListener implements OnClickListener {
public void onClick(View v) {
String httpUrl = "http://192.168.0.101:8080/Test/test.jsp?par=HttpClient_android_Get";
// HttpGet连接对象
HttpGet httpRequest = new HttpGet(httpUrl);
try {
// 取的HttpClient对象
HttpClient httpclient = new DefaultHttpClient();
// 请求HttpClient，取的HttpResponse
HttpResponse httpResponse = httpclient.execute(httpRequest);
// 请求成功
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
// 取的返回的字符串
String strResult = EntityUtils.toString(httpResponse.getEntity());
// 这个返回值可能会在行尾出现小方格
// 在TextView要显示的文字过滤掉回车符（"\r"）就可以正常显示了。
String strsResult = strResult.replace("\r", "");
mTextView.setText(strsResult);
} else {
mTextView.setText("请求错误");
}
} catch (ClientProtocolException e) {
mTextView.setText(e.getMessage().toString());
} catch (IOException e) {
mTextView.setText(e.getMessage().toString());
} catch (Exception e) {
mTextView.setText(e.getMessage().toString());
}
}
}
}
第四种方式：
public class Activity4 extends Activity{
private TextView mTextView;
private Button mButton;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextView = (TextView) findViewById(R.id.TextView01);
mButton = (Button) findViewById(R.id.Button01);
mButton.setOnClickListener(new httpListener());
}
// 设置按钮监听器
class httpListener implements OnClickListener {
public void onClick(View arg0) {
String httpUrl = "http://192.168.0.101:8080/Test/test.jsp";
// 创建HttpPost连接对象
HttpPost httpRequest = new HttpPost(httpUrl);
// 使用NameValuePair来保存要传递的Post参数
List params = new ArrayList();
// 添加要传递的参数
params.add(new BasicNameValuePair("par","HttpClient_android_Post"));
try {
// 设置字符集
HttpEntity httpentity = new UrlEncodedFormEntity(params,"gb2312");
// 请求httpRequest
httpRequest.setEntity(httpentity);
// 取的默认的HttpClient
HttpClient httpclient = new DefaultHttpClient();
// 取的HttpResponse
HttpResponse httpResponse = httpclient.execute(httpRequest);
// HttpStatus.SC_OK表示连接成功
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
// 取的返回的字符串
String strResult = EntityUtils.toString(httpResponse.getEntity());
// 这个返回值可能会在行尾出现小方格
// 在TextView要显示的文字过滤掉回车符（"\r"）就可以正常显示了。
String strsResult = strResult.replace("\r", "");
mTextView.setText(strsResult);
} else {
mTextView.setText("请求错误");
}
} catch (ClientProtocolException e) {
mTextView.setText(e.getMessage().toString());
} catch (IOException e) {
mTextView.setText(e.getMessage().toString());
} catch (Exception e) {
mTextView.setText(e.getMessage().toString());
}
}
}
}