• 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。

    【一,使用JDK中HttpURLConnection访问网络资源】

     1 public String executeHttpGet() {
     2         String result = null;
     3         URL url = null;
     4         HttpURLConnection connection = null;
     5         InputStreamReader in = null;
     6         try {
     7             url = new URL("http://10.0.2.2:8888/data/get/?token=alexzhou");
     8             connection = (HttpURLConnection) url.openConnection();
     9             in = new InputStreamReader(connection.getInputStream());
    10             BufferedReader bufferedReader = new BufferedReader(in);
    11             StringBuffer strBuffer = new StringBuffer();
    12             String line = null;
    13             while ((line = bufferedReader.readLine()) != null) {
    14                 strBuffer.append(line);
    15             }
    16             result = strBuffer.toString();
    17         } catch (Exception e) {
    18             e.printStackTrace();
    19         } finally {
    20             if (connection != null) {
    21                 connection.disconnect();
    22             }
    23             if (in != null) {
    24                 try {
    25                     in.close();
    26                 } catch (IOException e) {
    27                     e.printStackTrace();
    28                 }
    29             }
    30  
    31         }
    32         return result;
    33     }
    (1)get请求

    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

     1 public String executeHttpPost() {
     2         String result = null;
     3         URL url = null;
     4         HttpURLConnection connection = null;
     5         InputStreamReader in = null;
     6         try {
     7             url = new URL("http://10.0.2.2:8888/data/post/");
     8             connection = (HttpURLConnection) url.openConnection();
     9             connection.setDoInput(true);
    10             connection.setDoOutput(true);
    11             connection.setRequestMethod("POST");
    12             connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    13             connection.setRequestProperty("Charset", "utf-8");
    14             DataOutputStream dop = new DataOutputStream(
    15                     connection.getOutputStream());
    16             dop.writeBytes("token=alexzhou");
    17             dop.flush();
    18             dop.close();
    19  
    20             in = new InputStreamReader(connection.getInputStream());
    21             BufferedReader bufferedReader = new BufferedReader(in);
    22             StringBuffer strBuffer = new StringBuffer();
    23             String line = null;
    24             while ((line = bufferedReader.readLine()) != null) {
    25                 strBuffer.append(line);
    26             }
    27             result = strBuffer.toString();
    28         } catch (Exception e) {
    29             e.printStackTrace();
    30         } finally {
    31             if (connection != null) {
    32                 connection.disconnect();
    33             }
    34             if (in != null) {
    35                 try {
    36                     in.close();
    37                 } catch (IOException e) {
    38                     e.printStackTrace();
    39                 }
    40             }
    41  
    42         }
    43         return result;
    44     }
    (2)post请求

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

    【二,使用Apache的HttpClient访问网络资源】

     1 public String executeGet() {
     2         String result = null;
     3         BufferedReader reader = null;
     4         try {
     5             HttpClient client = new DefaultHttpClient();
     6             HttpGet request = new HttpGet();
     7             request.setURI(new URI(
     8                     "http://10.0.2.2:8888/data/get/?token=alexzhou"));
     9             HttpResponse response = client.execute(request);
    10             reader = new BufferedReader(new InputStreamReader(response
    11                     .getEntity().getContent()));
    12  
    13             StringBuffer strBuffer = new StringBuffer("");
    14             String line = null;
    15             while ((line = reader.readLine()) != null) {
    16                 strBuffer.append(line);
    17             }
    18             result = strBuffer.toString();
    19  
    20         } catch (Exception e) {
    21             e.printStackTrace();
    22         } finally {
    23             if (reader != null) {
    24                 try {
    25                     reader.close();
    26                     reader = null;
    27                 } catch (IOException e) {
    28                     e.printStackTrace();
    29                 }
    30             }
    31         }
    32  
    33         return result;
    34     }
    (1)get请求
     1 public String executePost() {
     2         String result = null;
     3         BufferedReader reader = null;
     4         try {
     5             HttpClient client = new DefaultHttpClient();
     6             HttpPost request = new HttpPost();
     7             request.setURI(new URI("http://10.0.2.2:8888/data/post/"));
     8             List<NameValuePair> postParameters = new ArrayList<NameValuePair>();
     9             postParameters.add(new BasicNameValuePair("token", "alexzhou"));
    10             UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(
    11                     postParameters);
    12             request.setEntity(formEntity);
    13  
    14             HttpResponse response = client.execute(request);
    15             reader = new BufferedReader(new InputStreamReader(response
    16                     .getEntity().getContent()));
    17  
    18             StringBuffer strBuffer = new StringBuffer("");
    19             String line = null;
    20             while ((line = reader.readLine()) != null) {
    21                 strBuffer.append(line);
    22             }
    23             result = strBuffer.toString();
    24  
    25         } catch (Exception e) {
    26             e.printStackTrace();
    27         } finally {
    28             if (reader != null) {
    29                 try {
    30                     reader.close();
    31                     reader = null;
    32                 } catch (IOException e) {
    33                     e.printStackTrace();
    34                 }
    35             }
    36         }
    37  
    38         return result;
    39     }
    (2)post请求

    【三,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:

     1 #coding=utf-8
     2  
     3 import json
     4 from flask import Flask,request,render_template
     5  
     6 app = Flask(__name__)
     7  
     8 def send_ok_json(data=None):
     9     if not data:
    10         data = {}
    11     ok_json = {'ok':True,'reason':'','data':data}
    12     return json.dumps(ok_json)
    13  
    14 @app.route('/data/get/',methods=['GET'])
    15 def data_get():
    16     token = request.args.get('token')
    17     ret = '%s**%s' %(token,'get')
    18     return send_ok_json(ret)
    19  
    20 @app.route('/data/post/',methods=['POST'])
    21 def data_post():
    22     token = request.form.get('token')
    23     ret = '%s**%s' %(token,'post')
    24     return send_ok_json(ret)
    25  
    26 if __name__ == "__main__":
    27     app.run(host="localhost",port=8888,debug=True)
    View Code

    版权属于: Alex Zhou的BLOG

    原文地址: http://codingnow.cn/android/723.html

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  • 原文地址:https://www.cnblogs.com/Miami/p/4277228.html
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