okhttp GitHub地址&＃xff1a;
https://github.com/square/okhttp
最新的OkHttp依赖可以到官方的GitHub上去添加。

目前官方的依赖地址为&＃xff1a;
compile ‘com.squareup.okhttp3:okhttp:3.6.0’

Get请求

直接进入主题&＃xff1a;

// 1、拿到OKHttpClient对象OkHttpClient okHttpClient&＃61;new OkHttpClient();// 2、构造Request//Request是构造者模式&＃xff0c;所以使用的时候要.BuilderRequest.Builder builder&＃61;new Request.Builder();Request reqyest&＃61;builder.get().url("http://www.baidu.com").build();// 3、将Request封装为CallCall call&＃61;okHttpClient.newCall(reqyest);// 4、执行Call/* Response response&＃61;call.execute(); //直接执行 需要抛出异常*/call.enqueue(new Callback() {&＃64;Overridepublic void onFailure(Call call, IOException e) {//失败以后的方法}&＃64;Overridepublic void onResponse(Call call, Response response) throws IOException {//成功以后回调的方法String res&＃61;response.body().string(); //回调一个字符串}});

最后在Manifests中打开网络权限即可使用Get请求请求网络数据了。
get请求头的格式&＃xff1a;
例&＃xff1a; url&＃43;”login?username&＃61;chengdu&password&＃61;123456”

POST请求

post请求大体步骤和GET请求差不多&＃xff0c;具体如代码所示

//获得一个功能强大的FormBody表单RequestBody formBody&＃61;new FormBody.Builder().build();//2.构造RequestRequest.Builder builder&＃61;new Request.Builder();Request request&＃61;builder.url("http://www.imooc.com/").post(formBody).build();// 3、将Request封装为CallexecuteRequest(request);

RequestBody的数据格式都要指定Content-Type&＃xff0c;常见的有三种&＃xff1a;

• application/x-www-form-urlencoded 数据是个普通表单
• multipart/form-data 数据里有文件
• application/json 数据是个json

之后还要加上 charset&＃61;utf-8

POST Json例子

public void postJson(){//获得一个FormBody表单RequestBody requestBody&＃61;RequestBody.create(MediaType.parse("application/json;charset&＃61;utf-8"),"{Json字符串}");//2.构造RequestRequest.Builder builder&＃61;new Request.Builder();Request request&＃61;builder.url("http://www.imooc.com/").post(requestBody).build();// 3、将Request封装为CallexecuteRequest(request);}

POST 上传一个图片

public void postFile(){File file&＃61;new File(Environment.getExternalStorageDirectory(),"banana.jpg");if (!file.exists()){Log.e("-------","不存在");return;}//获得一个FormBody表单RequestBody requestBody&＃61;RequestBody.create(MediaType.parse("application/octet-stream; charset&＃61;utf-8"),file);//2.构造RequestRequest.Builder builder&＃61;new Request.Builder();Request request&＃61;builder.url("http://www.imooc.com/").post(requestBody).build();// 3、将Request封装为CallexecuteRequest(request);}

下载文件

public void downloadFile(){Request.Builder builder&＃61;new Request.Builder();Request request&＃61;builder.get().url("所要下载文件的文件路径").build();Call call&＃61;okHttpClient.newCall(request);call.enqueue(new Callback() {&＃64;Overridepublic void onFailure(Call call, IOException e) {//失败以后的方法Log.e("----","失败以后的方法");}&＃64;Overridepublic void onResponse(Call call, Response response) throws IOException {InputStream inputStream&＃61;response.body().byteStream();int len&＃61;0;File file&＃61;new File(Environment.getExternalStorageDirectory(), "zc.jpg");byte[] buf &＃61;new byte[128];FileOutputStream fos&＃61;new FileOutputStream(file);while ((len&＃61; inputStream.read(buf))!&＃61;-1){fos.write(buf,0,len);}fos.flush();fos.close();inputStream.close();}});

下载图片并且设置

//下载图片并且设置public void downloadSetImage(){Request.Builder builder&＃61;new Request.Builder();Request request&＃61;builder.get().url("所要下载文件的文件路径").build();Call call&＃61;okHttpClient.newCall(request);call.enqueue(new Callback() {&＃64;Overridepublic void onFailure(Call call, IOException e) {//失败以后的方法Log.e("----","失败以后的方法");}&＃64;Overridepublic void onResponse(Call call, Response response) throws IOException {InputStream inputStream&＃61;response.body().byteStream();final Bitmap bitmap&＃61; BitmapFactory.decodeStream(inputStream);runOnUiThread(new Runnable() {&＃64;Overridepublic void run() {mImageView.setImageBitmap(bitmap);}});}});}