本文使用eclipse编辑器，gradle依赖jar，如若未配置此环境，请转Java Eclipse配置gradle编译项目配置好环境后再查看此文
- 在build.gradle中添加依赖
compile 'com.squareup.okhttp3:okhttp:3.8.1' - 同步Get请求
/**
* 同步get请求
*/
public static void syncGet() throws Exception{
String urlBaidu = "http://www.baidu.com/";
OkHttpClient okHttpClient = new OkHttpClient(); // 创建OkHttpClient对象
Request request = new Request.Builder().url(urlBaidu).build(); // 创建一个请求
Response response = okHttpClient.newCall(request).execute(); // 返回实体
if (response.isSuccessful()) { // 判断是否成功
/**获取返回的数据，可通过response.body().string()获取，默认返回的是utf-8格式；
* string()适用于获取小数据信息，如果返回的数据超过1M，建议使用stream()获取返回的数据，
* 因为string() 方法会将整个文档加载到内存中。*/
System.out.println(response.body().string()); // 打印数据
}else {
System.out.println("失败"); // 链接失败
}
}
- 异步Get请求
/**
* 异步Get请求
*/
public static void asyncGet() {
String urlBaidu = "http://www.baidu.com/";
OkHttpClient okHttpClient = new OkHttpClient(); // 创建OkHttpClient对象
Request request = new Request.Builder().url(urlBaidu).build(); // 创建一个请求
okHttpClient.newCall(request).enqueue(new Callback() { // 回调
public void onResponse(Call call, Response response) throws IOException {
// 请求成功调用，该回调在子线程
System.out.println(response.body().string());
}
public void onFailure(Call call, IOException e) {
// 请求失败调用
System.out.println(e.getMessage());
}
});
}
4.Post提交表单
/**
* Post提交表单
*/
public static void postFromParameters() {
String url = "http://v.juhe.cn/wepiao/query"; // 请求链接
String KEY = "9488373060c8483a3ef6333353fdc7fe"; // 请求参数
OkHttpClient okHttpClient = new OkHttpClient(); // OkHttpClient对象
RequestBody formBody = new FormBody.Builder().add("key", KEY).build(); // 表单键值对
Request request = new Request.Builder().url(url).post(formBody).build(); // 请求
okHttpClient.newCall(request).enqueue(new Callback() {// 回调
public void onResponse(Call call, Response response) throws IOException {
System.out.println(response.body().string());//成功后的回调
}
public void onFailure(Call call, IOException e) {
System.out.println(e.getMessage());//失败后的回调
}
});
}
- Post提交字符串
/**
* Post提交字符串
* 使用Post方法发送一串字符串，但不建议发送超过1M的文本信息
*/
public static void postStringParameters(){
MediaType MEDIA_TYPE = MediaType.parse("text/text; charset=utf-8");
String url = "http://v.juhe.cn/wepiao/query"; // 请求链接
OkHttpClient okHttpClient = new OkHttpClient(); // OkHttpClient对象
String string = "key=9488373060c8483a3ef6333353fdc7fe"; // 要发送的字符串
/**
* RequestBody.create(MEDIA_TYPE, string)
* 第二个参数可以分别为：byte[]，byteString,File,String。
*/
Request request = new Request.Builder().url(url)
.post(RequestBody.create(MEDIA_TYPE,string)).build();
okHttpClient.newCall(request).enqueue(new Callback() {
public void onResponse(Call call, Response response) throws IOException {
System.out.println(response.body().string());
}
public void onFailure(Call call, IOException e) {
System.out.println(e.getMessage());
}
});
}
- Gson解析Response的Gson对象
/**
* Gson解析Response的Gson对象
*/
public static void gsonResponsePost() {
String url = "http://v.juhe.cn/wepiao/query"; // 请求链接
String KEY = "9488373060c8483a3ef6333353fdc7fe"; // 请求参数
OkHttpClient okHttpClient = new OkHttpClient(); // OkHttpClient对象
RequestBody formBody = new FormBody.Builder().add("key", KEY).build(); // 表单键值对
Request request = new Request.Builder().url(url).post(formBody).build(); // 请求
okHttpClient.newCall(request).enqueue(new Callback() {// 回调
public void onResponse(Call call, Response response) throws IOException {
//成功后的回调
Gson gson = new Gson();
Info info = gson.fromJson(response.body().string(), Info.class);
System.out.println(info.toString());
}
public void onFailure(Call call, IOException e) {
System.out.println(e.getMessage());//失败后的回调
}
});
}
/**
* Java Bean
*/
public class Info{
int error_code; //状态码
String reason; // 返回状态文字
Result result; // 页面URL
@Override
public String toString() {
return "Info [error_code=" + error_code + ", reason=" + reason + ", result=" + result.toString() + "]";
}
}
/**
* Java Bean
*/
public class Result{
String h5url;
String h5weixin;
@Override
public String toString() {
return "Result [h5url=" + h5url + ", h5weixin=" + h5weixin + "]";
}
}
- okhttp3 设置超时时间
/**
* 设置超时
* @throws IOException
*/
public static void timeOutPost() throws IOException {
OkHttpClient client = new OkHttpClient.Builder()
.connectTimeout(10, TimeUnit.SECONDS)//设置链接超时
.writeTimeout(10, TimeUnit.SECONDS) // 设置写数据超时
.readTimeout(30, TimeUnit.SECONDS) // 设置读数据超时
.build();
Request request = new Request.Builder().url("http://www.baidu.com/").build();
Response response = client.newCall(request).execute();
System.out.println("Response completed: " + response);
}
- 缓存设置
/**
* 缓存设置
* @throws Exception
*/
public static void cachePost() throws Exception {
File sdcache = new File("D:/file");
int cacheSize = 10 * 1024 * 1024; // 10 MiB
OkHttpClient client = new OkHttpClient()
.Builder()
.cache(new Cache(sdcache.getAbsoluteFile(), cacheSize))
.build();
Request request = new Request.Builder()
.url("http://publicobject.com/helloworld.txt")
.build();
Response response1 = client.newCall(request).execute();
if (!response1.isSuccessful()) throw new IOException("Unexpected code " + response1);
String response1Body = response1.body().string();
System.out.println("Response 1 response: " + response1);
System.out.println("Response 1 cache response: " + response1.cacheResponse());
System.out.println("Response 1 network response: " + response1.networkResponse());
request = request.newBuilder().cacheControl(CacheControl.FORCE_NETWORK).build();
Response response2 = client.newCall(request).execute();
if (!response2.isSuccessful()) throw new IOException("Unexpected code " + response2);
String response2Body = response2.body().string();
System.out.println("Response 2 response: " + response2);
System.out.println("Response 2 cache response: " + response2.cacheResponse());
System.out.println("Response 2 network response: " + response2.networkResponse());
System.out.println("Response 2 equals Response 1? " + response1Body.equals(response2Body));
}
打印结果:
Response 1 response: Response{protocol=http/1.1, code=200, message=OK, url=https://publicobject.com/helloworld.txt}
Response 1 cache response: Response{protocol=http/1.1, code=200, message=OK, url=https://publicobject.com/helloworld.txt}
Response 1 network response: null
Response 2 response: Response{protocol=http/1.1, code=200, message=OK, url=https://publicobject.com/helloworld.txt}
Response 2 cache response: null
Response 2 network response: Response{protocol=http/1.1, code=200, message=OK, url=https://publicobject.com/helloworld.txt}
Response 2 equals Response 1? true
- 复用OkHttpClient
/**
* 所有HTTP请求的代理设置，超时，缓存设置等都需要在OkHttpClient中设置。 如果需要更改一个请求的配置，可以使用
* OkHttpClient.newBuilder()获取一个builder对象，
* 该builder对象与原来OkHttpClient共享相同的连接池，配置等。
*/
public static void shareClient() {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url("http://www.baidu.com/").build();
try {
// Copy to customize OkHttp for this request.
OkHttpClient copy = client.newBuilder().readTimeout(500, TimeUnit.MILLISECONDS).build();
Response response = copy.newCall(request).execute();
System.out.println("Response 1 succeeded: " + response);
} catch (IOException e) {
System.out.println("Response 1 failed: " + e);
}
try {
// Copy to customize OkHttp for this request.
OkHttpClient copy = client.newBuilder().readTimeout(3000, TimeUnit.MILLISECONDS).build();
Response response = copy.newCall(request).execute();
System.out.println("Response 2 succeeded: " + response);
} catch (IOException e) {
System.out.println("Response 2 failed: " + e);
}
}
- OkHttp3处理验证
/**
* 登录验证
* @throws IOException
*/
public static void authenticatorPost() throws IOException {
OkHttpClient okHttpClient =
new OkHttpClient
.Builder()
.authenticator(new Authenticator() {
public Request authenticate(Route route, Response response) throws IOException {
System.out.println(response.challenges().toString());
String credential = Credentials.basic("jesse", "password1");
return response
.request()
.newBuilder()
.addHeader("Authorization", credential)
.build();
}
})
.build();
Request request = new Request.Builder().url("http://publicobject.com/secrets/hellosecret.txt").build();
Response response = okHttpClient.newCall(request).execute();
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
System.out.println(response.body().string());
}