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httpmime：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
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | 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
?
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | 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
