5.post上传和压缩、插件模拟请求

 

gzip

gzip一种压缩方式,或者是文件形式,它主要用于网络传输数据的压缩

gzip压缩好不好用

• 浏览器:网速一定.内容越小.请求响应的速度是不是更快
• 手机server:返回数据类型是json/xml->文本-->压缩率会很高.

gzip执行流程

• //1. 告知服务器.客户端支持gzip解压

  * get.addHeader("Accept-Encoding", "gzip");
  

• //2. 根据响应头得知服务器知否进行了gzip压缩

  * Header[] headers = response.getHeaders("Content-Encoding");
      for (Header header : headers) {
          if ("gzip".equals(header.getValue())) {
              isUseGzip = true;
          }
  }
  

• //3.根据是否使用gzip.解压具体的数据

  if (isUseGzip) {
      GZIPInputStream in = new GZIPInputStream(entity.getContent());
      result = IoUtils.convertStreamToString(in);
  } else {
      result = EntityUtils.toString(entity);
  }
  

• 服务端具体怎么支持gzip压缩.根据使用的服务器语言来定

post请求参数的形式

• key-value--->表单:结构比较单一.而且比较繁琐

  List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();
      for (String key : parmas.keySet()) {
          BasicNameValuePair basicNameValuePair = new BasicNameValuePair(key, parmas.get(key));
          parameters.add(basicNameValuePair);
      }
      UrlEncodedFormEntity form = new UrlEncodedFormEntity(parameters);
      post.setEntity(form);
  

• jsonString形式:结构灵活.实际开发用的很多

      post.setEntity(new StringEntity(jsonString));
  

• file形式:需要jar包：很多框架上传图片就是用他

      MultipartEntity entity = new MultipartEntity();
      entity.addPart("actimg", new FileBody(file));
      post.setEntity(entity);
  

• 多张图片上传:写个循环，用键值，可以用BasicNameValuePair，也可以用file，循环添加，也可以用base64变成string上传

• Base64:byte[]-->string
• 上传图片,语音:
• 存对象到sp:如map

	iv = (ImageView) findViewById(R.id.iv);
		findViewById(R.id.btn1).setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				//1.bitmap
				Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
				//2. bitmap-->byte[]
				ByteArrayOutputStream baos = new ByteArrayOutputStream();
				bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
				byte[] byteArray = baos.toByteArray();
				//3.byte[]->string,这样就可以用string传给服务器
				String bitmapString = Base64.encodeToString(byteArray, Base64.DEFAULT);
				System.out.println("bitmapString :" + bitmapString);
				//4. string-->byte[];
				byte[] bitmapByteArr = Base64.decode(bitmapString, Base64.DEFAULT);
				//5.byte[]-->bitmap
				Bitmap bitmap2 = BitmapFactory.decodeByteArray(bitmapByteArr, 0, bitmapByteArr.length);
				//6.在imageView上设置图片
				iv.setImageBitmap(bitmap2);
				//obj-->byte[] -->string->sp
			}
		});

　　

post的content-type

• application/x-www-form-urlencoded :表单类型-->key-value，默认
• multipart/form-data :文件上传
• application/json :jsonString
• text/xml :xml
• text/plain:文本
• post.addHeader("Content-Type", "application/json");//如果后台固定死了.不加请求头.同样返回json那就没问题.但是如果后台逻辑和这个请求头有关系.就必须要加上.可以肯定的说.加了万无一失

 

 

MainActivity

public class MainActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initGzip();
		Map<String, String> map = new HashMap<String, String>();
		map.put("name", "billy");

		initPostKeyValue(map);
		String jsonString = "{\"name\":\"billy\"}";
		initPostJsonString(jsonString);
		File file = new File("");
		initPostFile(file);
	}
	/**
	 * 文件的上传
	 * @param file
	 */
	private void initPostFile(File file) {
		try {
			DefaultHttpClient httpClient = new DefaultHttpClient();
			HttpPost post = new HttpPost("");
			//2. 传递二进制类型的参数
			MultipartEntity entity = new MultipartEntity();
			entity.addPart("actimg", new FileBody(file));
			post.setEntity(entity);
			httpClient.execute(post);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	/**
	 * 使用jsonString post数据库
	 * @param jsonString
	 */
	private void initPostJsonString(String jsonString) {
		try {
			DefaultHttpClient httpClient = new DefaultHttpClient();
			HttpPost post = new HttpPost("");
			post.addHeader("Content-Type", "application/json");
			//Content-Type text/xml-->xml
			//Content-Type application/json-->json
			//2. 传递jsonString类型的参数
			post.setEntity(new StringEntity(jsonString));
			httpClient.execute(post);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	/**
	 * 使用key-value的形式post数据
	 * @param parmas 请求参数对于的map集合
	 */
	private void initPostKeyValue(Map<String, String> parmas) {
		try {
			DefaultHttpClient httpClient = new DefaultHttpClient();
			HttpPost post = new HttpPost("");
			//1. 传递key-value的参数
			List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();
			for (String key : parmas.keySet()) {
				BasicNameValuePair basicNameValuePair = new BasicNameValuePair(key, parmas.get(key));
				parameters.add(basicNameValuePair);
			}
			UrlEncodedFormEntity form = new UrlEncodedFormEntity(parameters);
			post.setEntity(form);
			httpClient.execute(post);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	private void initGzip() {
		findViewById(R.id.btn1).setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				new Thread(new Runnable() {
					@Override
					public void run() {
						try {
							boolean isUseGzip = false;
							DefaultHttpClient httpClient = new DefaultHttpClient();
							HttpGet get = new HttpGet("http://httpbin.org/gzip");
							//1. 告知服务器.客户端支持gzip解压
							get.addHeader("Accept-Encoding", "gzip");
							HttpResponse response = httpClient.execute(get);
							if (response.getStatusLine().getStatusCode() == 200) {
								//2. 根据响应头得知服务器知否进行了gzip压缩
								Header[] headers = response.getHeaders("Content-Encoding");
								for (Header header : headers) {
									if ("gzip".equals(header.getValue())) {
										isUseGzip = true;
									}
								}
								HttpEntity entity = response.getEntity();
								//3.根据是否使用gzip.解压具体的数据
								String result = "";
								if (isUseGzip) {
									GZIPInputStream in = new GZIPInputStream(entity.getContent());
									result = IoUtils.convertStreamToString(in);
								} else {
									result = EntityUtils.toString(entity);
								}
								System.out.println("result:" + result);
							}
						} catch (Exception e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
				}).start();
			}
		});
	}
}

　　

 

restclient(firfox插件),postman(谷歌浏览器)

网络请求模拟插件，post用，get直接在浏览器网页就打开了