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Android Http请求方法汇总

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摘要:Android Http请求方法汇总

Android Http请求方法汇总


这篇文章主要实现了在Android中使用JDK的HttpURLConnection和Apache的HttpClient访问网络资源,服务端采用python+flask编写,使用Servlet太麻烦了。关于Http协议的相关知识,可以在网上查看相关资料。代码比较简单,就不详细解释了。

1. 使用JDK中HttpURLConnection访问网络资源

public String executeHttpGet() {
 String result = null;
 URL url = null;
 HttpURLConnection connection = null;
 InputStreamReader in = null;
 try {
 url = new URL("http://10.0.2.2:8888/data/get/?token=alexzhou");
 connection = (HttpURLConnection) url.openConnection();
 in = new InputStreamReader(connection.getInputStream());
 BufferedReader bufferedReader = new BufferedReader(in);
 StringBuffer strBuffer = new StringBuffer();
 String line = null;
 while ((line = bufferedReader.readLine()) != null) {
 strBuffer.append(line);
 }
 result = strBuffer.toString();
 } catch (Exception e) {
 e.printStackTrace();
 } finally {
 if (connection != null) {
 connection.disconnect();
 }
 if (in != null) {
 try {
 in.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }
 return result;
 }


注意:因为是通过android模拟器访问本地pc服务端,所以不能使用localhost和127.0.0.1,使用127.0.0.1会访问模拟器自身。Android系统为实现通信将PC的IP设置为10.0.2.2
(2)post请求
public String executeHttpPost() {
 String result = null;
 URL url = null;
 HttpURLConnection connection = null;
 InputStreamReader in = null;
 try {
 url = new URL("http://10.0.2.2:8888/data/post/");
 connection = (HttpURLConnection) url.openConnection();
 connection.setDoInput(true);
 connection.setDoOutput(true);
 connection.setRequestMethod("POST");
 connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
 connection.setRequestProperty("Charset", "utf-8");
 DataOutputStream dop = new DataOutputStream(
 connection.getOutputStream());
 dop.writeBytes("token=alexzhou");
 dop.flush();
 dop.close();
 in = new InputStreamReader(connection.getInputStream());
 BufferedReader bufferedReader = new BufferedReader(in);
 StringBuffer strBuffer = new StringBuffer();
 String line = null;
 while ((line = bufferedReader.readLine()) != null) {
 strBuffer.append(line);
 }
 result = strBuffer.toString();
 } catch (Exception e) {
 e.printStackTrace();
 } finally {
 if (connection != null) {
 connection.disconnect();
 }
 if (in != null) {
 try {
 in.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }
 return result;
 }

如果参数中有中文的话,可以使用下面的方式进行编码解码:

1 URLEncoder.encode("测试","utf-8")
2 URLDecoder.decode("测试","utf-8");

2.使用Apache的HttpClient访问网络资源
(1)get请求

public String executeGet() {
 String result = null;
 BufferedReader reader = null;
 try {
 HttpClient client = new DefaultHttpClient();
 HttpGet request = new HttpGet();
 request.setURI(new URI(
 "http://10.0.2.2:8888/data/get/?token=alexzhou"));
 HttpResponse response = client.execute(request);
 reader = new BufferedReader(new InputStreamReader(response
 .getEntity().getContent()));
 StringBuffer strBuffer = new StringBuffer("");
 String line = null;
 while ((line = reader.readLine()) != null) {
 strBuffer.append(line);
 }
 result = strBuffer.toString();
 } catch (Exception e) {
 e.printStackTrace();
 } finally {
 if (reader != null) {
 try {
 reader.close();
 reader = null;
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }
 return result;
 }

(2)post请求

public String executePost() {
 String result = null;
 BufferedReader reader = null;
 try {
 HttpClient client = new DefaultHttpClient();
 HttpPost request = new HttpPost();
 request.setURI(new URI("http://10.0.2.2:8888/data/post/"));
 List<NameValuePair> postParameters = new ArrayList<NameValuePair>();
 postParameters.add(new BasicNameValuePair("token", "alexzhou"));
 UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(
 postParameters);
 request.setEntity(formEntity);
 HttpResponse response = client.execute(request);
 reader = new BufferedReader(new InputStreamReader(response
 .getEntity().getContent()));
 StringBuffer strBuffer = new StringBuffer("");
 String line = null;
 while ((line = reader.readLine()) != null) {
 strBuffer.append(line);
 }
 result = strBuffer.toString();
 } catch (Exception e) {
 e.printStackTrace();
 } finally {
 if (reader != null) {
 try {
 reader.close();
 reader = null;
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }
 return result;
 }

3.服务端代码实现
上面是采用两种方式的get和post请求的代码,下面来实现服务端的代码编写,使用python+flask真的非常的简单,就一个文件,前提是你得搭建好python+flask的环境,代码如下:
#coding=utf-8
import json
from flask import Flask,request,render_template
app = Flask(__name__)
def send_ok_json(data=None):
 if not data:
 data = {}
 ok_json = {'ok':True,'reason':'','data':data}
 return json.dumps(ok_json)
@app.route('/data/get/',methods=['GET'])
def data_get():
 token = request.args.get('token')
 ret = '%s**%s' %(token,'get')
 return send_ok_json(ret)
@app.route('/data/post/',methods=['POST'])
def data_post():
 token = request.form.get('token')
 ret = '%s**%s' %(token,'post')
 return send_ok_json(ret)
if __name__ == "__main__":
 app.run(host="localhost",port=8888,debug=True)

运行服务器,如图:

4. 编写单元测试代码
右击项目:new–》Source Folder取名tests,包名是:com.alexzhou.androidhttp.test(随便取,没有要求),结构如图:


在该包下创建测试类HttpTest,继承自AndroidTestCase。编写这四种方式的测试方法,代码如下:
public class HttpTest extends AndroidTestCase {
 @Override
 protected void setUp() throws Exception {
 Log.e("HttpTest", "setUp");
 }
 @Override
 protected void tearDown() throws Exception {
 Log.e("HttpTest", "tearDown");
 }
 public void testExecuteGet() {
 Log.e("HttpTest", "testExecuteGet");
 HttpClientTest client = HttpClientTest.getInstance();
 String result = client.executeGet();
 Log.e("HttpTest", result);
 }
 public void testExecutePost() {
 Log.e("HttpTest", "testExecutePost");
 HttpClientTest client = HttpClientTest.getInstance();
 String result = client.executePost();
 Log.e("HttpTest", result);
 }
 public void testExecuteHttpGet() {
 Log.e("HttpTest", "testExecuteHttpGet");
 HttpClientTest client = HttpClientTest.getInstance();
 String result = client.executeHttpGet();
 Log.e("HttpTest", result);
 }
 public void testExecuteHttpPost() {
 Log.e("HttpTest", "testExecuteHttpPost");
 HttpClientTest client = HttpClientTest.getInstance();
 String result = client.executeHttpPost();
 Log.e("HttpTest", result);
 }
}

附上HttpClientTest.java的其他代码:
public class HttpClientTest {
private static final Object mSyncObject = new Object();
private static HttpClientTest mInstance;
private HttpClientTest() {
}
public static HttpClientTest getInstance() {
synchronized (mSyncObject) {
if (mInstance != null) {
return mInstance;
}
mInstance = new HttpClientTest();
}
return mInstance;
}
 /**...上面的四个方法...*/
}