使用Retrofit进行Http、Https网络请求（快速上手）

1.配置gradle

//注解包
compile 'com.jakewharton:butterknife:7.0.0'
//Retrofit2所需要的包//这里需要值得注意的是导入的retrofit2包的版本必须要一致，否则就会报错compile 'com.squareup.retrofit2:retrofit:2.0.0'
//ConverterFactory的Gson依赖包
compile 'com.squareup.retrofit2:converter-gson:2.0.0'

2.先使用http进行网络请求，这里我使用的是百度API的手机号码归属地查询的接口（点这里）

初始化Retrofit

private static final String BASE_URL = "http://apis.baidu.com";
private static final String API_KEY = "b90f262a4f321bb6755157bf1915b4f8";
//1.创建Retrofit对象
Retrofit retrofit = new Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create())//增加返回值为Gson的支持(以实体类返回)
.baseUrl(BASE_URL)//主机地址
.build();

根据返回的json数据格式使用GsonFormat一键生成JavaBean（这个大家应该都会，AS常用的工具），最终结果如下：

public class PhoneResult {
/**
* errNum : 0
* retMsg : success
* retData : {"phone":"15210011578","prefix":"1521001","supplier":"移动","province":"北京","city":"北京","suit":"152卡"}
*/

private int errNum;
private String retMsg;
private RetDataEntity retData;
public void setErrNum(int errNum) {
this.errNum = errNum;
}
public void setRetMsg(String retMsg) {
this.retMsg = retMsg;
}
public void setRetData(RetDataEntity retData) {
this.retData = retData;
}
public int getErrNum() {
return errNum;
}
public String getRetMsg() {
return retMsg;
}
public RetDataEntity getRetData() {
return retData;
}
public static class RetDataEntity {
/**
* phone : 15210011578
* prefix : 1521001
* supplier : 移动
* province : 北京
* city : 北京
* suit : 152卡
*/
private String phone;
private String prefix;
private String supplier;
private String province;
private String city;
private String suit;
public void setPhone(String phone) {
this.phone = phone;
}
public void setPrefix(String prefix) {
this.prefix = prefix;
}
public void setSupplier(String supplier) {
this.supplier = supplier;
}
public void setProvince(String province) {
this.province = province;
}
public void setCity(String city) {
this.city = city;
}
public void setSuit(String suit) {
this.suit = suit;
}
public String getPhone() {
return phone;
}
public String getPrefix() {
return prefix;
}
public String getSupplier() {
return supplier;
}
public String getProvince() {
return province;
}
public String getCity() {
return city;
}
public String getSuit() {
return suit;
}
}
}

定义请求的API

public interface PhoneService {
@GET("/apistore/mobilenumber/mobilenumber")   //是方法Url
//@Query**(“phone”)来设定body的parameters.
Call<PhoneResult> getResult(@Header("apikey") String apikey, @Query("phone") String phone);
}

调用API

//这里采用的是Java的动态代理模式
PhoneService service = retrofit.create(PhoneService.class);
//传入我们请求的键值对的值，mPhoneEt是我们输入的手机号
Call<PhoneResult> call = service.getResult(API_KEY, mPhoneEt.getText().toString());

发送请求

call.enqueue(new Callback<PhoneResult>() {
@Override
public void onResponse(Call<PhoneResult> call, Response<PhoneResult> response) {
//处理结果
if (response.isSuccessful()) {
PhoneResult result = response.body();
if (result != null) {
if (result.getRetMsg() != null) {
mAddressTv.setText(result.getRetMsg());//设置显示到texiview上
} else {
PhoneResult.RetDataEntity entity = result.getRetData();
mAddressTv.setText(entity.getProvince());
}
}
}
}
@Override
public void onFailure(Call<PhoneResult> call, Throwable t) {
}
});

看下结果



最终结果

3.使用https进行网络请求

将证书拷贝到raw目录下



https请求服务器需要的证书都知道Retrofit的网络请求是使用okhttp，所以我们只需要给
OkHttpClient.Builder().sslSocketFactory(sslSocketFactory)，那么SSLSocketFactory怎么得到呢，哈哈，不要急，方法已经写好：

public class SslContextFactory {
private static final String CLIENT_TRUST_PASSWORD = "changeit";//信任证书密码，该证书默认密码是changeit
private static final String CLIENT_AGREEMENT = "TLS";//使用协议
private static final String CLIENT_TRUST_MANAGER = "X509";
private static final String CLIENT_TRUST_KEYSTORE = "BKS";
SSLContext sslContext = null;
public SSLContext getSslSocket() {
try {
//取得SSL的SSLContext实例
sslContext = SSLContext.getInstance(CLIENT_AGREEMENT);
//取得TrustManagerFactory的X509密钥管理器实例
TrustManagerFactory trustManager = TrustManagerFactory.getInstance(CLIENT_TRUST_MANAGER);
//取得BKS密库实例
KeyStore tks = KeyStore.getInstance(CLIENT_TRUST_KEYSTORE);
InputStream is = MyApplication.getInstance().getResources().openRawResource(R.raw.suplcerts);
try {
tks.load(is, CLIENT_TRUST_PASSWORD.toCharArray());
} finally {
is.close();
}
//初始化密钥管理器
trustManager.init(tks);
//初始化SSLContext
sslContext.init(null, trustManager.getTrustManagers(), null);
} catch (Exception e) {
Log.e("SslContextFactory", e.getMessage());
}
return sslContext;    }}

给OkHttpClient.Builder().sslSocketFactory(sslSocketFactory)

SSLSocketFactory sslSocketFactory = new SslContextFactory().getSslSocket().getSocketFactory();
OkHttpClient.Builder okHttpClient = new OkHttpClient.Builder().sslSocketFactory(sslSocketFactory);

创建Retrofit对象

Retrofit retrofit = new Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create())//增加返回值为Gson的支持(以实体类返回)
.baseUrl("https://skyish-test.yunext.com")//主机地址
.client(okHttpClient.build())       /注意这里要给retrofit 设置okhttpclient
.build();

后面的创建请求的API跟调用API跟上面的使用http请求是一样的，可以自己找个接口试试，亲测，没有问题，这里我就不贴代码了。

作者：起个牛逼的昵称
链接：http://www.jianshu.com/p/9a6c204616d2
來源：简书
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