android studio环境配置
在Module的build.gradle文件中增加依赖包：
dependencies {
···
compile 'com.squareup.okhttp3:okhttp:3.4.1'
}
基本使用
主要有发Get和Post请求两种
Get请求
新建工程。先看代码
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
public class MainActivity extends AppCompatActivity {
Response response;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Thread(
new Runnable() {
@Override
public void run() {
try {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url("https://raw.github.com/square/okhttp/master/README.md").build();
response = client.newCall(request).execute();
} catch (Exception e) {
e.printStackTrace();
}
}
}
).start();
try {
Log.v("mylog", response.body().string());
} catch (Exception e) {
e.printStackTrace();
}
}
}
结果如下：
Paste_Image.png
其中由于UI线程不能发网络请求，必须开新的线程来进行网络处理。
其中主要代码是:
try {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url("https://raw.github.com/square/okhttp/master/README.md").build();
Response response = client.newCall(request).execute();
Log.v("mylog", response.body().string());
} catch (Exception e) {
e.printStackTrace();
}
Response类：
（1）isSuccessful() 方法
public boolean isSuccessful() //如果返回码是[200..300),该函数则返回true。
（2）body() 方法
Response response;
ResponseBody responseBody = response.body() //返回ResponseBody类
String string = responseBody.string()
ResponseBody类的string方法，将response作为string返回。
Post请求
新建工程。先看代码
public class MainActivity extends AppCompatActivity {
Response response;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Thread(
new Runnable() {
@Override
public void run() {
try {
testPost();
try {
if(response.isSuccessful()){
Log.v("mylog", response.body().string());
Log.v("mylog", response.header("Set-Cookie"));
}else {
Log.v("mylog", "Unexpected code " + response);
}
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
).start();
}
public String GetJson(String PhoneNum, String VerifyCode) {
JSONObject jsn_login = new JSONObject();
try{
jsn_login.put("phoneNo",PhoneNum);
jsn_login.put("requestOtp",VerifyCode);
}catch (Exception e){}
return jsn_login.toString();
}
public void testPost() throws IOException {
OkHttpClient client = new OkHttpClient();
MediaType JSON = MediaType.parse("application/x-www-form-urlencoded; charset=utf-8");
RequestBody body = RequestBody.create(JSON, GetJson("11111111111","1234"));
Request request = new Request.Builder()
.url("http://localhost:8080/login.do")
.header("User-Agent", "OkHttp Headers.java")
.addHeader("Accept", "application/json; q=0.5")
.post(body)
.build();
response = client.newCall(request).execute();
}
}
（1）设置请求头的方法：
1）对于header(String name, String value)方法，使用name和value设置一个头信息，如果请求中已经存在响应的信息那么直接替换掉。
2）而addHeader(String name, String value)，如果请求头中已经存在name的name-value，那么还会继续添加，请求头中便会存在多个name相同而value不同的“键值对”。
（2）获取返回头的方法：
1）response.header("name")方法：如果header中有重复的，则返回最后出现的value。如果没有值，那么header(name)将返回null。
response.header("Set-Cookie")``` 代表获取cookie。
2）response.headers()方法，获取所有的header：返回一个list。为了获取所有的Header，Headers类支持按index访问。
Headers responseHeaders = response.headers();
for (int i = 0; i < responseHeaders.size(); i++) {
System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
}
（3）Post请求提交Json数据
1）首先新建一个MediaType
MediaType代表的就是请求包体内容的类型。
例如，MediaType.parse("application/json; charset=utf-8");这个就带表请求体的类型为JSON格式的。
2）再通过 RequestBody.create(MediaType, JSONDATA);的方法来创建一个 RequestBody
3）最后通过Request.Builder().Post(RequestBody)方法来加入post数据。
public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");
OkHttpClient client = new OkHttpClient();
String post(String url, String json) throws IOException {
RequestBody body = RequestBody.create(JSON, json);
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Response response = client.newCall(request).execute();
f (response.isSuccessful()) {
return response.body().string();
} else {
throw new IOException("Unexpected code " + response);
}
}
（4）Post请求提交键值对
具体方法如下：
OkHttpClient client = new OkHttpClient();
String post(String url, String json) throws IOException {
RequestBody formBody = new FormEncodingBuilder()
.add("platform", "android")
.add("name", "bug")
.add("subject", "XXXXXXXXXXXXXXX")
.build();
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Response response = client.newCall(request).execute();
if (response.isSuccessful()) {
return response.body().string();
} else {
throw new IOException("Unexpected code " + response);
}
}
（5）Post方式提交文件
public static final MediaType MEDIA_TYPE_MARKDOWN
= MediaType.parse("text/x-markdown; charset=utf-8");
private final OkHttpClient client = new OkHttpClient();
public void run() throws Exception {
File file = new File("README.md");
Request request = new Request.Builder()
.url("https://api.github.com/markdown/raw")
.post(RequestBody.create(MEDIA_TYPE_MARKDOWN, file))
.build();
Response response = client.newCall(request).execute();
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
System.out.println(response.body().string());
}
（6）Post方式提交分块请求
MultipartBuilder可以构建复杂的请求体，与HTML文件上传形式兼容。多块请求体中每块请求都是一个请求体，可以定义自己的请求头。这些请求头可以用来描述这块请求，例如他的Content-Disposition。如果Content-Length和Content-Type可用的话，他们会被自动添加到请求头中。
private static final String IMGUR_CLIENT_ID = "...";
private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");
private final OkHttpClient client = new OkHttpClient();
public void run() throws Exception {
// Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image
RequestBody requestBody = new MultipartBuilder()
.type(MultipartBuilder.FORM)
.addPart(
Headers.of("Content-Disposition", "form-data; name=\"title\""),
RequestBody.create(null, "Square Logo"))
.addPart(
Headers.of("Content-Disposition", "form-data; name=\"image\""),
RequestBody.create(MEDIA_TYPE_PNG, new File("website/static/logo-square.png")))
.build();
Request request = new Request.Builder()
.header("Authorization", "Client-ID " + IMGUR_CLIENT_ID)
.url("https://api.imgur.com/3/image")
.post(requestBody)
.build();
Response response = client.newCall(request).execute();
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
System.out.println(response.body().string());
}
异步Get请求
先看代码
public class MainActivity extends AppCompatActivity {
Response response;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
testAsyncGet();
}
public void testAsyncGet() {
OkHttpClient client = new OkHttpClient();
final Request request = new Request.Builder().url("http://publicobject.com/helloworld.txt").build();
System.out.println(request);
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
e.printStackTrace();
}
@Override
public void onResponse(Call call, Response response) throws IOException {
Log.v("mylog", "call = [" + call + "], response = [" + response + "]");
if (!response.isSuccessful()) {
throw new IOException("" + response);
}
Headers headers = response.headers();
for (int i = 0; i < headers.size(); i++) {
Log.v("mylog", headers.name(i) + ": " + headers.value(i));
}
System.out.println(response.body().string());
}
});
}
}
输出如下：
Paste_Image.png
https://github.com/square/okhttp/wiki/Recipes
http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0106/2275.html
http://blog.csdn.net/biezhihua/article/details/50603624
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