##HttpClient (Apache)
6.0中已经移除了这个方法,Google建议使用HttpUrlConnection 见Android 6.0 Changes

###GET 方法

  • 新建一个HttpGet对象

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    HttpGet httpGet = new HttpGet("https://baidu.com");
  • 获取HtttpClient实例

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    HttpClient httpClient = new DefaultHttpClient();
  • 获取HttpResponse实例 并传入HttpGet对象

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    HttpResponse response = httpClient.execute(httpGet);
  • 判断是否请求成功

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    if(response.getStatusLine().getStatusCode()==200)
    {//do something
    HttpEntity httpEntity = response.getEntity();
    String result = EntityUtils.toString(httpEntity);
    String result = EntityUtils.toString(response.getEntity(),"UTF-8");//带中文的话
    }

POST 方法

  • 新建一个HttpGet对象

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    HttpGet httpPost = new HttpPost("https://baidu.com");
  • 获取HtttpClient实例

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    HttpClient httpClient = new DefaultHttpClient();
  • 设置POST参数(1)

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    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("username", "username"));
    params.add(new BasicNameValuePair("password", "password"));
    //添加内容到请求中
    UrlEncodedFormEntity entity = new UrlEncodedFromEntity(params,"UTF-8");
    httpPost.setEntity(entity);
  • 设置POST参数(2)

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    NameValuePair namePair = new BasicNameValuePair("username","username");
    NameValuePair pswPair = new BasicNameValuePair("password","password");
    List<NameValuePair> pairList = new ArrayList<NameValuePair>();
    pariList.add(namePair);
    //添加内容到请求中
    HttpEntity httpEntity = new UrlEncodedFormEntity(pairlist);
    httpPost.setEntity(httpEntity);
  • 获取HttpResponse实例 并传入HttpGet对象

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    HttpResponse response = httpClient.execute(httpPost);
  • 判断是否请求成功

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    if(response.getStatusLine().getStatusCode()==200)
    {//do something
    HttpEntity httpEntity = response.getEntity();
    String result = EntityUtils.toString(httpEntity);
    //String result = EntityUtils.toString(response.getEntity(),”UTF-8”);//带中文的话
    }

##HttpUrlConnection

GET 方法

  • 先new一个Url 对象,并传入网址

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    Url url = new Url("https://baidu.com");
  • 打开一个HttpUrlConnection连接

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    HttpUrlConnection httpUrlConnection = (HttpUrlConnection) url.openConnection();
  • 设置get或者post方法

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    httpUrlConnection.setRequestMethod(“GET”);
  • 定制一些信息 比如超时时间,title等

  • 调用getInputStream 获取服务器返回的输入流

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    InputStream in = httpUrlConnection.getInputStream();
    //对获取到的输入流进行读取
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    StringBuilder response = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
    response.append(line);
    }
  • 关闭连接

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    httpUrlConnection.disconnect();

POST 方法

  • 前面都一样
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    httpUrlConnection.setRequestMethod("POST");
    DataOutputStream dataOutputStream = new DataOutputStream(httpUrlConnection.getOutputStream);
    dataOutputStream.writeBytes("username=XXX&password=YYY");