OkHttp
目录
OkHttp是一个优秀的网络请求框架,可能一说到网络请求框架,可能很多人都会想到
volley,volley是一个Google提供的网络请求框架,我的博客里也有一篇专门介绍volley的博客,博客地址在此**Android网络请求 —— Volley的使用** 那么既然Google提供了网络请求的框架,我们为什么还要使用OkHttp呢,原来是volley是要依靠HttpCient的,而Google在Android6.0的SDK中去掉了HttpCient,所以OkHttp就开始越来越受大家的欢迎.
1. get 请求
- 获取OkHttpClient对象
- 设置请求request
- 封装call
- 异步调用,并设置回调函数
public void get(String url){
// 1 获取OkHttpClient对象
OkHttpClient client = new OkHttpClient();
// 2设置请求
Request request = new Request.Builder()
.get()
.url(url)
.build();
// 3封装call
Call call = client.newCall(request);
// 4异步调用,并设置回调函数
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
Toast.makeText(OkHttpActivity.this, "get failed", Toast.LENGTH_SHORT).show();
}
@Override
public void onResponse(Call call, final Response response) throws IOException {
final String res = response.body().string();
runOnUiThread(new Runnable() {
@Override
public void run() {
contentTv.setText(res);
}
});
}
});
//同步调用,返回Response,会抛出IO异常
//Response response = call.execute();
}
2. Post 请求
OkHttpClient client = new OkHttpClient();
//构建FormBody,传入参数
FormBody formBody = new FormBody.Builder()
.add("username", "admin")
.add("password", "admin")
.build();
//post方法需要传入的是一个RequestBody对象,FormBody是RequestBody的子类
//RequestBody requestBody = RequestBody.create(MediaType.parse("text/plain;charset=utf-8"), "{username:admin;password:admin}");
//构建Request,将FormBody作为Post方法的参数传入
final Request request = new Request.Builder()
.url("http://www.jianshu.com/")
.post(formBody)
.build();
//将Request封装为Call
Call call = client.newCall(request);
//调用请求,重写回调方法
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
Toast.makeText(OkHttpActivity.this, "Post Failed", Toast.LENGTH_SHORT).show();
}
@Override
public void onResponse(Call call, Response response) throws IOException {
final String res = response.body().string();
runOnUiThread(new Runnable() {
@Override
public void run() {
contentTv.setText(res);
}
});
}
});
3. Post 上传文件&提交表单
File file = new File(Environment.getExternalStorageDirectory(), "1.png");
if (!file.exists()){
Toast.makeText(this, "文件不存在", Toast.LENGTH_SHORT).show();
}else{
RequestBody requestBody2 = RequestBody.create(MediaType.parse("application/octet-stream"), file);
}
File file = new File(Environment.getExternalStorageDirectory(), "1.png");
if (!file.exists()){
Toast.makeText(this, "文件不存在", Toast.LENGTH_SHORT).show();
return;
}
RequestBody muiltipartBody = new MultipartBody.Builder()
//一定要设置这句
.setType(MultipartBody.FORM)
.addFormDataPart("username", "admin")//
.addFormDataPart("password", "admin")//
.addFormDataPart("myfile", "1.png", RequestBody.create(MediaType.parse("application/octet-stream"), file))
.build();
4. get 下载文件
OkHttpClient client = new OkHttpClient();
final Request request = new Request.Builder()
.get()
.url("https://www.baidu.com/img/bd_logo1.png")
.build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
Log.e("moer", "onFailure: ");;
}
@Override
public void onResponse(Call call, Response response) throws IOException {
//拿到字节流
InputStream is = response.body().byteStream();
int len = 0;
File file = new File(Environment.getExternalStorageDirectory(), "n.png");
FileOutputStream fos = new FileOutputStream(file);
byte[] buf = new byte[128];
while ((len = is.read(buf)) != -1){
fos.write(buf, 0, len);
}
fos.flush();
//关闭流
fos.close();
is.close();
}
});
}
@Override
public void onResponse(Call call, Response response) throws IOException {
InputStream is = response.body().byteStream();
final Bitmap bitmap = BitmapFactory.decodeStream(is);
runOnUiThread(new Runnable() {
@Override
public void run() {
imageView.setImageBitmap(bitmap);
}
});
is.close();
}