上一篇介绍了关于OkHttp进行GET请求和POST请求最基本的用法,下面继续介绍OkHttp的使用。
上一篇地址:http://blog.csdn.net/james_shu/article/details/55270728
首先来介绍一下有关于OkHttp将json作为请求参数来请求服务器端并得到响应的使用流程:
OkHttpClient client=new OkHttpClient();
RequestBody requestBody=RequestBody.create(MediaType.parse("application/json;charset=UTF-8"),"{'name':'wangshu','age':18}");
Request request=new Request.Builder().post(requestBody).url("http://10.0.2.2:8088/TestSpringMVC/postjson").build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, final Response response) throws IOException {
runOnUiThread(new Runnable() {
@Override
public void run() {
try {
Toast.makeText(getApplicationContext(),response.body().string().toString(),Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
});
我们可以使用OkHTTP来将流作为请求体以POST的方式请求服务器,通过这种方式我们可以实现文件上传:
OkHttpClient client = new OkHttpClient();
final File file = new File(Environment.getExternalStorageDirectory(), "aaa.txt");
RequestBody requestBody=new RequestBody() {
@Override
public MediaType contentType() {
return MediaType.parse("text/x-markdown; charset=utf-8");
}
@Override
public void writeTo(BufferedSink sink) throws IOException {
BufferedReader reader=new BufferedReader(new InputStreamReader(new FileInputStream(file)));
String line=null;
while ((line=reader.readLine())!=null){
sink.write(line.getBytes());
}
}
};
Request request=new Request.Builder().url("http://10.0.2.2:8088/TestSpringMVC/uploadfile")
.post(requestBody)
.build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, final Response response) throws IOException {
runOnUiThread(new Runnable() {
@Override
public void run() {
try {
Toast.makeText(getApplicationContext(),response.body().string(),Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
});
下面继续介绍OkHttp使用缓存:
OkHttpClient.Builder builder=new OkHttpClient.Builder();
//设置缓存
int cacheSize=10*1024*1024;//10M
Cache cache=new Cache(getCacheDir(),cacheSize);
builder.cache(cache);
final OkHttpClient client=builder.build();
final Request request=new Request.Builder().url("http://publicobject.com/helloworld.txt").build();
new Thread(){
@Override
public void run() {
super.run();
try {
Response response1=client.newCall(request).execute();
System.out.println("Response 1 response: " + response1);
System.out.println("Response 1 cache response: " + response1.cacheResponse());
System.out.println("Response 1 network response: " + response1.networkResponse());
String response1Body = response1.body().string();
Response response2 = client.newCall(request).execute();
if (!response2.isSuccessful()) throw new IOException("Unexpected code " + response2);
String response2Body = response2.body().string();
System.out.println("Response 2 response: " + response2);
System.out.println("Response 2 cache response: " + response2.cacheResponse());
System.out.println("Response 2 network response: " + response2.networkResponse());
System.out.println("Response 2 equals Response 1? " + response1Body.equals(response2Body));
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();