Android Http请求方法汇总
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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
(1)get请求
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:
URLEncoder.encode(
"测试"
,
"utf-8"
)
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-8import jsonfrom flask import Flask,request,render_templateapp = 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 {@Overrideprotected void setUp() throws Exception {Log.e("HttpTest", "setUp");}@Overrideprotected 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...*/}
现在还需要修改Android项目的配置文件AndroidManifest.xml,添加网络访问权限和单元测试的配置,AndroidManifest.xml配置文件的全部代码如下:
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.alexzhou.androidhttp" android:versionCode="1" android:versionName="1.0" > <uses-permission android:name="android.permission.INTERNET" /> <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <uses-library android:name="android.test.runner" /> <activity android:name=".MainActivity" android:label="@string/title_activity_main" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <instrumentation android:name="android.test.InstrumentationTestRunner" android:targetPackage="com.alexzhou.androidhttp" /></manifest>
注意:
android:name=”android.test.InstrumentationTestRunner”这部分不用更改
android:targetPackage=”com.alexzhou.androidhttp”,填写应用程序的包名
5.测试结果
展开测试类HttpTest,依次选中这四个测试方法,右击:Run As–》Android Junit Test。
(1)运行testExecuteHttpGet,结果如图:
(2)运行testExecuteHttpPost,结果如图:
(3)运行testExecuteGet,结果如图:
(4)运行testExecutePost,结果如图:
版权属于: Alex's Blog
原文地址: http://codingnow.cn/android/723.html
转载时必须以链接形式注明原始出处及本声明。
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