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>() {
			@Override
			protected 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URL
					URLConnection 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 block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				return result.toString();
			}

			@Override
			protected void onPostExecute(String result) {
				// TODO Auto-generated method stub
				tv.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>() {
			@Override
			protected 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API
					HttpURLConnection 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 block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				return result.toString();
			}

			@Override
			protected void onPostExecute(String result) {
				// TODO Auto-generated method stub
				tv.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>() {
			@Override
			protected 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 block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				return null;
			}

			@Override
			protected 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>() {
			@Override
			protected 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 block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				return null;
			}

			@Override
			protected 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>() {
			@Override
			protected 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;
			}

			@Override
			protected void onPostExecute(Bitmap result) {
				// TODO Auto-generated method stub
				if (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