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    Android Http请求方法汇总

    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...*/
    }