Post
在進行post請求的時候，通常RequestBody的數(shù)據(jù)都要指定Content-Type，常見的有：
所有的MediaTypes
| MediaType | 備注 |
|---|---|
| application/json | JSON數(shù)據(jù)格式 |
| multipart/form-data | 需要在表單中進行文件上傳時，就需要使用該格式 |
| application/x-www-form-urlencoded | <form encType=””>中默認的encType，form表單數(shù)據(jù)被編碼為key/value格式發(fā)送到服務器（表單默認的提交數(shù)據(jù)的格式） |
| image/png | png圖片格式 |
| text/html | HTML格式 |
| text/plain | 純文本格式 |
| text/x-markdown | 文本MarkDown |
| text/xml | XML格式 |
| image/gif | gif圖片格式 |
| image/jpeg | jpg圖片格式 |
| application/xhtml+xml | XHTML格式 |
| application/xml | XML數(shù)據(jù)格式 |
| application/pdf | pdf格式 |
| application/msword | Word文檔格式 |
| application/octet-stream | 二進制流數(shù)據(jù)（如常見的文件下載） |
Content-Type也可以使用這種方式
public static final String FORM_DATA = "multipart/form-data;";
public static final String IMAGE_DATA = "image/*; charset=utf-8";
public static final String JSON_DATA = "application/json; charset=utf-8";
public static final String VIDEO_DATA = "video/*";
public static final String AUDIO_DATA = "audio/*";
public static final String TEXT_DATA = "text/plain";
public static final String APK_DATA = "application/vnd.android.package-archive";
public static final String JAVA_DATA = "java/*";
public static final String MESSAGE_DATA = "message/rfc822";
一、post 請求(FormBody 表單)
使用FormBody創(chuàng)建 RequestBody 直接使用 key - value ，傳入?yún)?shù)
//1,創(chuàng)建client
OkHttpClient client = new OkHttpClient();
//FormBody 創(chuàng)建表單請求體
FormBody formBody = new FormBody.Builder()
.add("name", "zhangsan")//傳入?yún)?shù)
.add("age", "11")
.build();
//3，創(chuàng)建request
Request request = new Request.Builder()
.url("--url--")//偽 url
.post(formBody)//請求體
.build();
//異步請求
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
//失敗回調(diào)，子線程
}
@Override
public void onResponse(Call call, Response response) throws IOException {
//成功回調(diào)，子線程
}
});
二、 post 請求 (json)
數(shù)據(jù)為json的時候，需要指定MediaType.parse("application/json; charset=utf-8");為json
OkHttpClient client = new OkHttpClient();
MediaType JSON_TYPE = MediaType.parse("application/json; charset=utf-8");
String jsonString = "{ \"name\": \"zhangsan\",\"age\": \"10\"}";//傳遞的json數(shù)據(jù)
//構建requestBody
RequestBody requestBody = RequestBody.create(JSON_TYPE, jsonString);
//3，創(chuàng)建request
Request request = new Request.Builder()
.url("--url--")
.post(requestBody)//請求體
.build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
//失敗回調(diào)，子線程
}
@Override
public void onResponse(Call call, Response response) throws IOException {
//成功回調(diào)，子線程
}
});
三、 post 請求 (file + key-value)
OkHttpClient client = new OkHttpClient();
//構建MultipartBody
MultipartBody multipartBody = new MultipartBody.Builder()
.setType(MultipartBody.FORM);
.addFormDataPart("name", "zhangsan")//傳遞 key - value
.addFormDataPart("age", "10")
.addFormDataPart("image", "imageName", RequestBody.create(MediaType.parse("image/png"), new File("image.png")))//上傳 .png 文件
.build();
//3，創(chuàng)建request
Request request = new Request.Builder()
.url("--url--")
.post(multipartBody)//請求體
.build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
//失敗回調(diào)，子線程
}
@Override
public void onResponse(Call call, Response response) throws IOException {
//成功回調(diào)，子線程
}
});
四、自定義攔截器
可以通過自定義攔截器，對請求作出你想要出處理，例如下面的，如果接口返回的不是成功(code！=200)，則替換url
/**
* create by cuishuxiang
*
* @date : 2019/1/15
* @description: 自定義了攔截器，當code!=200的時候，替換URL
*/
public class ReplaceUrlInterceptor implements Interceptor {
private static final String TAG = "ReplaceUrlInterceptor";
String newUrl = "http://gank.io/api/data/%E7%A6%8F%E5%88%A9/6/1";
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
Response response = chain.proceed(request);
String url = request.url().toString();//
//如果接口code ！=200，替換url
while (response.code() != 200) {
url = newUrl;
Request newRequest = request.newBuilder().url(url).build();//這里重新構建request
response = chain.proceed(newRequest);//生成response
}
return response;
}
}
使用，在OkHttpClient 中添加自定義的攔截器
OkHttpClient client = new OkHttpClient.Builder()
.addInterceptor(new ReplaceUrlInterceptor())//添加自定義的攔截器
.build();
