详解Android中使用OkHttp发送HTTP的post请求的方法

概述HTTPPOST和PUT请求可以包含要提交的内容。只需要在创建Request对象时，通过post和put方法来指定要提交的内容即可。

http POST 和 PUT 请求可以包含要提交的内容。只需要在创建 Request 对象时，通过 post 和 put 方法来指定要提交的内容即可。
http POST 请求的基本示例：

public class poststring {  public static voID main(String[] args) throws IOException {  OkhttpClIEnt clIEnt = new OkhttpClIEnt();  MediaType MEDIA_TYPE_TEXT = MediaType.parse("text/plain");  String postbody = "Hello World";  Request request = new Request.Builder()      .url("http://www.baIDu.com")      .post(Requestbody.create(MEDIA_TYPE_TEXT,postbody))      .build();  Response response = clIEnt.newCall(request).execute();  if (!response.isSuccessful()) {    throw new IOException("服务器端错误: " + response);  }  System.out.println(response.body().string());  }}

以 String 类型提交内容只适用于内容比较小的情况。当请求内容较大时，应该使用流来提交。

Post方式提交流

以流的方式POST提交请求体。请求体的内容由流写入产生。这个例子是流直接写入 Okio 的BufferedSink。你的程序可能会使用 OutputStream ，你可以使用 BufferedSink.outputStream() 来获取。

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 { 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());}

Post方式提交文件

以文件作为请求体是十分简单的。

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方式提交表单

使用 FormEnCodingBuilder 来构建和HTML <form> 标签相同效果的请求体。键值对将使用一种HTML兼容形式的URL编码来进行编码。

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());}

Post方式提交分块请求

MultipartBuilder 可以构建复杂的请求体，与HTML文件上传形式兼容。多块请求体中每块请求都是一个请求体，可以定义自己的请求头。这些请求头可以用来描述这块请求，例如他的 Content-disposition 。如果 Content-Length 和 Content-Type 可用的话，他们会被自动添加到请求头中。

private static final String imgur_CLIENT_ID = "...";private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");private final OkhttpClIEnt clIEnt = new OkhttpClIEnt();public voID run() throws Exception { // Use the imgur image upload API as documented at https://API.imgur.com/endpoints/image Requestbody requestbody = new MultipartBuilder()   .type(MultipartBuilder.FORM)   .addPart(     headers.of("Content-disposition","form-data; name=\"Title\""),Requestbody.create(null,"Square logo"))   .addPart(     headers.of("Content-disposition","form-data; name=\"image\""),Requestbody.create(MEDIA_TYPE_PNG,new file("website/static/logo-square.png")))   .build(); Request request = new Request.Builder()   .header("Authorization","ClIEnt-ID " + imgur_CLIENT_ID)   .url("https://API.imgur.com/3/image")   .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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