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】

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

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 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】

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;
    }

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;
    }

【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：

#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)

版权属于: Alex Zhou的BLOG

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