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