安卓中进行基于HTTP协议的网络访问

安卓中进行基于HTTP协议的网络访问

 

两种方式：

HttpClient (apache开发）

HttpURLConnection（google在发布安卓时在Java基础上修改得到的）

 

进行网络访问的基本步骤：

1. 创建HC/UC对象

2. 声明发起网络访问的方式(GET/POST)

3. 进行网络连接

4. 获得服务器响应的结果

5. 解析结果，提取需要的内容

6. 解析结果要提交到UI线程进行呈现

 

Ps：必须申请权限 INTERNET访问权限；任何网络访问的相关代码，必须在工作线程中执行！

 

一、HttpClient (apache开发）方式：

1. post提交方式

HttpClient client = new DefaultHttpClient();

HttpClient client = new DefaultHttpClient();

HttpPost post = new HttpPost("http://172.88.134.152:8080/ems/login.do");

//添加一个请求头，对请求实体中的参数做一个说明

post.setHeader("Content-Type", "application/x-www-form-urlencoded");

post.setHeader("Cookie", sid);

//在post中添加请求参数,请求参数会添加在请求实体中

List<NameValuePair> parameters = new ArrayList<NameValuePair>();

parameters.add(new BasicNameValuePair("loginname", loginUser.getUserName()));

parameters.add(new BasicNameValuePair("password", loginUser.getPassword()));

parameters.add(new BasicNameValuePair("code", loginUser.getCode()));

HttpEntity entity = new UrlEncodedFormEntity(parameters);

post.setEntity(entity);

HttpResponse response = client.execute(post);

HttpEntity respEntity = response.getEntity();

String line = EntityUtils.toString(respEntity);

 2. get提交

//创建HC对象
URL url = new URL("http://172.88.134.152:8080/ems/getCode.do");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//声明获取方式 GET　｜　POST
connection.setRequestMethod("GET");
connection.setDoInput(true);
//发起网络访问，获得服务器响应
connection.connect();
//解析响应的结果
InputStream is = connection.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(is);
is.close();
//将解析结果从工作线程提交到主线程
Message.obtain(handler, 101, bitmap).sendToTarget();

二、HttpURLConnection（google在发布安卓时在Java基础上修改得到的）方式：

URL url = new URL("http://172.88.134.152:8080/ems/login.do");

HttpURLConnection connection = (HttpURLConnection) url.openConnection();

connection.setRequestMethod("POST");//提交方式：GET | POST

connection.setDoInput(true);

connection.setDoOutput(true);

connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

connection.setRequestProperty("Cookie", sid);

connection.connect();

//客户端提交数据

OutputStream out = connection.getOutputStream();

PrintWriter writer = new PrintWriter(out,true);

writer.print(getParams(loginUser));

writer.close();

//解析服务器响

InputStream in = connection.getInputStream();

BufferedReader reader = new BufferedReader(new InputStreamReader(in));

String line = reader.readLine();