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Android网络
Http:
1从网络获取数据
a从网络获取图片,以byte[]字节数组保存，并构建一个Bitmap
b.从网络获取为xml/Json，要解析，并封装成对象。
public byte[] getNetImage(String path) throws IOException{ URL url = new URL(path); HttpURLConnection connection =(HttpURLConnection) url.openConnection();//基于HTTP协议连接对象 connection.setConnectTimeout(5000); connection.setRequestMethod("GET"); if(connection.getResponseCode() == HttpURLConnection.HTTP_OK){ InputStream in =connection.getInputStream(); return Utils.readStream(in); } return null;} //将流读取到字节数组public static byte[] readStream(InputStream in) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = 0; while ((len = in.read(buffer)) != -1) { baos.write(buffer, 0, len); } return baos.toByteArray();}
2 以GET/POST方式上传到服务器
a.通过HTTP发送参数到服务器
GET不适合传输大数据
组拼url路径后的参数
POST:Content-Type Content-Length
组拼将要发送的实体数据
HttpClient开源项目
使用UrlEncodedFormEntity类构造实体数据
内部做了很多封装，性能不如手写的GET/POST
操作HTTPS,Cookie编码简单些
// 发送POST请求public static boolean sendPostRequest(String path, Map<String, String> params, String encoding)throws IOException { StringBuilder builder = new StringBuilder(); for (Map.Entry<String, String> entry : params.entrySet()) { builder.append("?").append(entry.getKey()).append("=").append(entry.getValue()).append("&"); } builder.deleteCharAt(builder.length() - 1); URL url = new URL(path); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setConnectTimeout(5000); connection.setRequestMethod("POST"); connection.addRequestProperty("Content-Type", ""); connection.addRequestProperty("Content-Length", String.valueOf(builder.length())); connection.setDoOutput(true); OutputStream os = connection.getOutputStream(); os.write(builder.toString().getBytes());// 只有取得服务器响应消息，才真正发送除数据，现在仅放到内存 if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) { return true; } return false;} // HttpClientpublic static boolean sendHttpClientRequest(String path, Map<String, String> params,String encoding) throws IOException { List<NameValuePair> valuePairs = new ArrayList<NameValuePair>(); for (Map.Entry<String, String> entry : params.entrySet()) { valuePairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue())); } UrlEncodedFormEntity entity = new UrlEncodedFormEntity(valuePairs, encoding);// 构造实体数据 HttpPost post = new HttpPost(path);// 构造POST请求 post.setEntity(entity); DefaultHttpClient client = new DefaultHttpClient();// 构造一个浏览器 HttpResponse response = client.execute(post); if (response.getStatusLine().getStatusCode() == 200) { return true; } return false;}
b.通过Socket上传文件到服务器
先判断文件是否存在
HttpClient内部使用缓存，当上传文件超过1M，产生内存溢出Socket
实体数据长度= 文本类型长度+文件类型长度
Android网络
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