OkHttp的使用

概述

准备研究Retrofit，而它是依赖OkHttp的，所以先使用一下OkHttp，不深究源码，只探究使用方法。以后有机会再翻查源码。

在进行之前，首先需要2个jar包，其中一个是okHttp的jar包，github上可以下载，另一个是它的依赖包，这个很关键，没有它，项目就无法运行。

OkHttp请求的2种方式

不难猜测，涉及到网络请求，那么无非2种方式，一种是使用回调，另一种则是开启子线程执行。
第一种：开启子线程执行

OkHttpClient client = new OkHttpClient();
Request build = new Request.Builder().url(url).build();
try {
<span style="white-space:pre">	</span>Response execute = client.newCall(build).execute();
if(execute.isSuccessful()){
System.out.println("wisely aaa");
} else {
System.out.println("wisely bbb");
}
} catch (IOException e) {
e.printStackTrace();
}

第二种：使用回调，我个人最喜欢使用这种。（PS：觉得自己真是too young too simple！！本来以为回调的方法是在主线程，结果发现，竟然是子线程，子线程....）

OkHttpClient client = new OkHttpClient();
Request build = new Request.Builder().url(url).build();
client.newCall(build).enqueue(new Callback() {

@Override
public void onResponse(Response arg0) throws IOException {
System.out.println("wisely   success");
}

@Override
public void onFailure(Request arg0, IOException arg1) {
System.out.println("wisely    failure");
}
});

OkHttp之get请求

1、获取图片

OkHttpClient client = new OkHttpClient();

Request build = new Request.Builder().url(url).build();
client.newCall(build).enqueue(new Callback() {

@Override
public void onResponse(Response response) throws IOException {
//		byte[] bytes = response.body().bytes();
InputStream is = response.body().byteStream();
Options options = new BitmapFactory.Options();
options.inSampleSize = 8;
//		Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length,options);
Bitmap bitmap = BitmapFactory.decodeStream(is, null, options);
Message msg = handler.obtainMessage();
msg.obj = bitmap;
handler.sendMessage(msg);
}

@Override
public void onFailure(Request arg0, IOException arg1) {
System.out.println("wisely fail:"+arg1.getCause().getMessage());
}
});

只写了关键代码，并未写handler的相关代码。
获取网络图片有2种方式，1是获取byte数组，2是获取输入流。注意，onResponse在子线程中...

OkHttp之post请求

比起get请求，post请求的分类略多。
1、首先是最常用的表单提交。

OkHttpClient client = new OkHttpClient();

RequestBody body = new FormEncodingBuilder()
.add("userName", "13363114390")
.add("password", "200820e3227815ed1756a6b531e7e0d2").build();

Request build = new Request.Builder().url(url).post(body).build();
client.newCall(build).enqueue(new Callback() {

@Override
public void onResponse(Response response) throws IOException {
String lenght = response.header("Content-Length");
System.out.println("wisely--lenght:" + lenght);

LoginResponse loginResponse = new Gson().fromJson(response.body().charStream(), LoginResponse.class);
System.out.println("wisely---" + loginResponse.getMessage());
}

@Override
public void onFailure(Request arg0, IOException arg1) {
System.out.println("wisely-----fail");
}
});

<pre name="code" class="java">class LoginResponse {
<span style="white-space:pre">	</span>String message;
String tokeId;
boolean result;

public boolean isResult() {
return result;
}

public void setResult(boolean result) {
this.result = result;
}

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}

public String getTokeId() {
return tokeId;
}

public void setTokeId(String tokeId) {
this.tokeId = tokeId;
}

}

上面的是一个简单的登录表单的提交，其中将返回的json数据封装到了一个bean中。除了能够获取json数据外，还能获取到各个消息头。

2、上传图片
这是我最关心的一个功能，实验证明，okHttp上传图片的功能确实强大，支持多图片上传。

private MediaType PNG = MediaType.parse("application/octet-stream");

OkHttpClient client = new OkHttpClient();

RequestBody body = new MultipartBuilder()
.type(MultipartBuilder.FORM)
.addPart(Headers.of("Content-Disposition","form-data; name=\"files\";filename=\"img1.jpg\""),RequestBody.create(PNG, file1))
.addPart(Headers.of("Content-Disposition","form-data; name=\"files\";filename=\"img2.jpg\""),RequestBody.create(PNG, file2)).build();

Request request = new Request.Builder()
<span style="white-space:pre">	</span>.url(url)
.post(body).build();
client.newCall(request).enqueue(new Callback() {

@Override
public void onResponse(Response response) throws IOException {

if(response.isSuccessful()){
UploadPNGResponse uploadPNGResponse = new Gson().fromJson(response.body().charStream(), UploadPNGResponse.class);
String msg = uploadPNGResponse.getMsg();

List<String> list = uploadPNGResponse.getList();
for (String string : list) {
System.out.println("wisely---path:"+string);
}

}
}

@Override
public void onFailure(Request arg0, IOException arg1) {
System.out.println("wisely---fail--"+arg1.getCause().getMessage());
}
});

class UploadPNGResponse{
<span style="white-space:pre">	</span>String msg;
boolean result;
List<String> list;
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public boolean isResult() {
return result;
}
public void setResult(boolean result) {
this.result = result;
}
public List<String> getList() {
return list;
}
public void setList(List<String> list) {
this.list = list;
}
}