android中Http和HttpClient的Get和Post方法的使用

android中Http和HttpClient的Get和Post方法的使用：

不要忘记添加网络请求权限

一，Http用Get方法请求数据：

1， 创建URL实例：URL url = new URL(“http://duduhali.sinaapp.com/Test/httpTest.php?name=duduhali&password=12345");

2， 获取URL连接：URLConnection connection = url.openConnection();

3，获取字节输入流：InputStream is = connection.getInputStream();

4，根据字节流生成字符流，并设置编码：InputStreamReader isr = new InputStreamReader(is,"utf-8");

5，创建字符流缓冲区：BufferedReader br = new BufferedReader(isr);

6，读取数据：while ((line = br.readLine()) != null) {
result.append(line);
}

7，分别关闭资源：br.close();
   isr.close();
    is.close();

代码如下：

new AsyncTask<String, Void, String>() {@Overrideprotected String doInBackground(String... params) {String line;StringBuffer result = new StringBuffer();try {// 用的是Http的Get方法URL url = new URL(params[0]);// 创建URLURLConnection connection = url.openConnection();// 获取URL连接InputStream is = connection.getInputStream();// 获取字节输入流InputStreamReader isr = new InputStreamReader(is, "utf-8");// 根据字节流生成字符流，并设置编码BufferedReader br = new BufferedReader(isr);// 创建字符流缓冲区while ((line = br.readLine()) != null) {result.append(line);}br.close();isr.close();is.close();} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return result.toString();}@Overrideprotected void onPostExecute(String result) {// TODO Auto-generated method stubtv.setText(result);// 显示数据}}.execute("http://duduhali.sinaapp.com/Test/httpTest.php?name=duduhali&password=12345");

二，Http用Post方法请求数据：

1，创建URL实例：URL url = new URL(params[0]);

2，获取URL链接并强制转换成子类HttpURL连接：HttpURLConnection connection = (HttpURLConnection) url.openConnection();

3，设置使用输出流和Post方法：connection.setDoOutput(true);// 设置使用输出流
connection.setRequestMethod("POST");// 默认为Get方法

//还可设置其它一些属性

4， 获取输出字节流并构建输出字符流，且设置编码：OutputStreamWriter osw = new OutputStreamWriter( connection.getOutputStream(), "utf-8");

5，创建输出缓冲区：BufferedWriter bw = new BufferedWriter(osw);

6，设置输出参数：bw.write("name=duduhali&password=12345");

7，刷新输出流：bw.flush();

8，获取输入字节流：InputStream is = connection.getInputStream();

9，创建输入字符流并设置编码：InputStreamReader isr = new InputStreamReader(is,"utf-8");//不设置编码有返回数据有中文时会出现乱码
10，创建输入缓冲区：BufferedReader br = new BufferedReader(isr);
11，读取网络返回数据：while ((line = br.readLine()) != null) {
result.append(line);
}
12，关闭输入流：br.close();
isr.close();
is.close();

代码如下：

new AsyncTask<String, Void, String>() {@Overrideprotected String doInBackground(String... params) {StringBuffer result = new StringBuffer();try {URL url = new URL(params[0]);// 获取URL链接并强制转换成子类HttpURL连接,以便能够使用更多的APIHttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setDoInput(true);// 输入流默认就为开启状态，可不设connection.setDoOutput(true);// 设置使用输出流connection.setRequestMethod("POST");// 默认为Get方法// connection.setUseCaches(false); // 设置是否使用缓存// (如果不设此项,在传送序列化对象时,当WEB服务默认的不是这种类型时可能抛java.io.EOFException)// connection.setRequestProperty("Content-type",// "application/x-java-serialized-object");// 获取输出字符流，并设置编码OutputStreamWriter osw = new OutputStreamWriter(connection.getOutputStream(), "utf-8");BufferedWriter bw = new BufferedWriter(osw);bw.write("name=duduhali&password=12345");// bw.write("a=A&b=B");bw.flush();InputStream is = connection.getInputStream();InputStreamReader isr = new InputStreamReader(is, "utf-8");// 不设置编码有返回数据有中文时会出现乱码BufferedReader br = new BufferedReader(isr);String line;while ((line = br.readLine()) != null) {result.append(line);}br.close();isr.close();is.close();} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return result.toString();}@Overrideprotected void onPostExecute(String result) {// TODO Auto-generated method stubtv.setText(result);}}.execute("http://duduhali.sinaapp.com/Test/httpTest.php");

三，HttpClient用Get方法请求数据：

1，创建HttpClient对象：HttpClient client = new DefaultHttpClient();

2，创建请求方法的实例：HttpGet get = new HttpGet(urlString);

3，发送请求获取连接响应信息：HttpResponse response = client.execute(get);

4，获取HttpEntity实体：HttpEntity httpEntity = response.getEntity();

5，获取服务器返回信息：String value = EntityUtils.toString(httpEntity, "utf-8");

代码如下：

new AsyncTask<String, Void, String>() {@Overrideprotected String doInBackground(String... arg0) {String urlString = arg0[0];HttpGet get = new HttpGet(urlString);// 创建请求方法的实例try {HttpResponse response = client.execute(get);// 获取连接响应信息// 可以调用HttpResponse的getAllHeaders()、getHeaders(String// name)等方法可获取服务器的响应头HttpEntity httpEntity = response.getEntity();// 获取HttpEntity实体// HttpEntity可以使流也可以是字符串，封装了一些对字符和流的操作，还有另外几种Entity实体类// String value = EntityUtils.toString( httpEntity// );//不加utf-8出现中文乱码String value = EntityUtils.toString(httpEntity, "utf-8");return value;} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}@Overrideprotected void onPostExecute(String result) {tv.setText(result);}}.execute("http://duduhali.sinaapp.com/Test/httpTest.php?name=duduhali&password=12345");

四，HttpClient用Post方法请求数据：

1，创建HttpClient对象：HttpClient client = new DefaultHttpClient();

2，创建请求方法的实例：HttpPost post = new HttpPost(arg0[0]);

3， 设置请求参数：

List<BasicNameValuePair> list = new ArrayList<BasicNameValuePair>();list.add(new BasicNameValuePair("name", "duduhali"));post.setEntity(new UrlEncodedFormEntity(list));

4，发送请求获取相应：HttpResponse response = client.execute(post);

5，获取HttpEntity实体：HttpEntity httpEntity = response.getEntity();

6，获取服务器返回信息：String value = EntityUtils.toString(httpEntity, "utf-8");

代码如下：

new AsyncTask<String, Void, String>() {@Overrideprotected String doInBackground(String... arg0) {HttpPost post = new HttpPost(arg0[0]);// 创建请求方法的实例try {List<BasicNameValuePair> list = new ArrayList<BasicNameValuePair>();list.add(new BasicNameValuePair("name", "duduhali"));post.setEntity(new UrlEncodedFormEntity(list));// 设置请求参数} catch (UnsupportedEncodingException e1) {}try {HttpResponse response = client.execute(post);// 发送请求获取相应HttpEntity httpEntity = response.getEntity();// 获取HttpEntity实体// HttpEntity可以是流也可以是字符串，封装了一些对字符和流的操作，还有另外几种Entity实体类// String value = EntityUtils.toString( httpEntity// );//不加utf-8出现中文乱码String value = EntityUtils.toString(httpEntity, "utf-8");return value;} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}@Overrideprotected void onPostExecute(String result) {tv.setText(result);}}.execute("http://duduhali.sinaapp.com/Test/httpTest.php");

五，获取图片

代码如下：

new AsyncTask<String, Void, Bitmap>() {@Overrideprotected Bitmap doInBackground(String... params) {try {URL url = new URL(params[0]);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");// setConnectTimeout：设置连接主机超时（单位：毫秒）// setReadTimeout：设置从主机读取数据超时（单位：毫秒）conn.setReadTimeout(5 * 1000);// 设置从主机读取超时时间为5秒int code = conn.getResponseCode();// 获取请求码，不设置setReadTimeout可能阻塞线程if (code == 200) {// 正常返回InputStream inputStream = conn.getInputStream();// 获取字节流Bitmap bitmap = BitmapFactory.decodeStream(inputStream);return bitmap;}} catch (Exception e) {e.printStackTrace();}return null;}@Overrideprotected void onPostExecute(Bitmap result) {// TODO Auto-generated method stubif (result != null) {tv.setBackground(new BitmapDrawable(result));}}}.execute("https://www.baidu.com/img/bd_logo1.png");

demo下载地址：http://download.csdn.net/detail/duduhali/8997427