OkHttp是一個(gè)高效的HTTP庫(kù):
創(chuàng)新互聯(lián)自2013年創(chuàng)立以來,是專業(yè)互聯(lián)網(wǎng)技術(shù)服務(wù)公司,擁有項(xiàng)目成都做網(wǎng)站、成都網(wǎng)站制作網(wǎng)站策劃,項(xiàng)目實(shí)施與項(xiàng)目整合能力。我們以讓每一個(gè)夢(mèng)想脫穎而出為使命,1280元城子河做網(wǎng)站,已為上家服務(wù),為城子河各地企業(yè)和個(gè)人服務(wù),聯(lián)系電話:18980820575支持 SPDY ,共享同一個(gè) Socket 來處理同一個(gè)服務(wù)器的所有請(qǐng)求
如果 SPDY 不可用,則通過連接池來減少請(qǐng)求延時(shí)
無縫的支持GZIP來減少數(shù)據(jù)流量
緩存響應(yīng)數(shù)據(jù)來減少重復(fù)的網(wǎng)絡(luò)請(qǐng)求
OkHttp 處理了很多網(wǎng)絡(luò)疑難雜癥:會(huì)從很多常用的連接問題中自動(dòng)恢復(fù)。如果您的服務(wù)器配置了多個(gè)IP地址,當(dāng)?shù)谝粋€(gè)IP連接失敗的時(shí)候,OkHttp會(huì)自動(dòng)嘗試下一個(gè)IP。OkHttp還處理了代理服務(wù)器問題和SSL握手失敗問題。
OkHttp是一個(gè)相對(duì)成熟的解決方案,據(jù)說Android4.4的源碼中可以看到HttpURLConnection已經(jīng)替換成OkHttp實(shí)現(xiàn)了。所以我們更有理由相信OkHttp的強(qiáng)大。
1、HTTP請(qǐng)求方法
同步GET請(qǐng)求
private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { Request request = new Request.Builder() .url("http://publicobject.com/helloworld.txt") .build(); Response response = client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException("Unexpected code " + response); Headers responseHeaders = response.headers(); for (int i = 0; i < responseHeaders.size(); i++) { System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i)); } System.out.println(response.body().string()); }
Response類的string()方法會(huì)把文檔的所有內(nèi)容加載到內(nèi)存,適用于小文檔,對(duì)應(yīng)大于1M的文檔,應(yīng) 使用流()的方式獲取。
response.body().byteStream()
異步GET請(qǐng)求
private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { Request request = new Request.Builder() .url("http://publicobject.com/helloworld.txt") .build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Request request, IOException e) { e.printStackTrace(); } @Override public void onResponse(Response response) throws IOException { if (!response.isSuccessful()) { throw new IOException("Unexpected code " + response); } Headers responseHeaders = response.headers(); for (int i = 0; i < responseHeaders.size(); i++) { System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i)); } System.out.println(response.body().string()); } }); }
讀取響應(yīng)會(huì)阻塞當(dāng)前線程,所以發(fā)起請(qǐng)求是在主線程,回調(diào)的內(nèi)容在非主線程中。
POST方式提交字符串
private static final MediaType MEDIA_TYPE_MARKDOWN = MediaType.parse("text/x-markdown; charset=utf-8"); private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { String postBody = "" + "Releases\n" + "--------\n" + "\n" + " * _1.0_ May 6, 2013\n" + " * _1.1_ June 15, 2013\n" + " * _1.2_ August 11, 2013\n"; Request request = new Request.Builder() .url("https://api.github.com/markdown/raw") .post(RequestBody.create(MEDIA_TYPE_MARKDOWN, postBody)) .build(); Response response = client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException("Unexpected code " + response); System.out.println(response.body().string()); }
因?yàn)檎麄€(gè)請(qǐng)求體都在內(nèi)存中,應(yīng)避免提交1M以上的文件。
POST方式提交流
private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { RequestBody requestBody = new RequestBody() { @Override public MediaType contentType() { return MEDIA_TYPE_MARKDOWN; } @Override public void writeTo(BufferedSink sink) throws IOException { sink.writeUtf8("Numbers\n"); sink.writeUtf8("-------\n"); for (int i = 2; i <= 997; i++) { sink.writeUtf8(String.format(" * %s = %s\n", i, factor(i))); } } private String factor(int n) { for (int i = 2; i < n; i++) { int x = n / i; if (x * i == n) return factor(x) + " × " + i; } return Integer.toString(n); } }; Request request = new Request.Builder() .url("https://api.github.com/markdown/raw") .post(requestBody) .build(); Response response = client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException("Unexpected code " + response); System.out.println(response.body().string()); }
使用Okio框架以流的形式將內(nèi)容寫入,這種方式不會(huì)出現(xiàn)內(nèi)存溢出問題。
POST方式提交文件
public static final MediaType MEDIA_TYPE_MARKDOWN = MediaType.parse("text/x-markdown; charset=utf-8"); private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { File file = new File("README.md"); Request request = new Request.Builder() .url("https://api.github.com/markdown/raw") .post(RequestBody.create(MEDIA_TYPE_MARKDOWN, file)) .build(); Response response = client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException("Unexpected code " + response); System.out.println(response.body().string()); }
POST方式提交表單
private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { RequestBody formBody = new FormEncodingBuilder() .add("search", "Jurassic Park") .build(); Request request = new Request.Builder() .url("https://en.wikipedia.org/w/index.php") .post(formBody) .build(); Response response = client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException("Unexpected code " + response); System.out.println(response.body().string()); }
表單的每個(gè)Names-Values都進(jìn)行了URL編碼。如果服務(wù)器端接口未進(jìn)行URL編碼,可定制個(gè) FormBuilder。
文件上傳(兼容html文件上傳)
private static final String IMGUR_CLIENT_ID = "..."; private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("p_w_picpath/png"); private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { // Use the imgur p_w_picpath upload API as documented at https://cache.yisu.com/upload/information/20200311/46/200136.jpg"))) .build(); Request request = new Request.Builder() .header("Authorization", "Client-ID " + IMGUR_CLIENT_ID) .url("https://api.imgur.com/3/p_w_picpath") .post(requestBody) .build(); Response response = client.newCall(request).execute(); if (!response.isSuccessful()) throw new IOException("Unexpected code " + response); System.out.println(response.body().string()); }
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文章題目:一、OkHttp請(qǐng)求方法-創(chuàng)新互聯(lián)
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