okhttp的使用

依赖

        <dependency>
            <groupId>com.squareup.okhttp3</groupId>
            <artifactId>okhttp</artifactId>
            <version>3.6.0</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.60</version>
        </dependency>

工具类

import com.alibaba.fastjson.JSON;
import okhttp3.*;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URLEncoder;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;


public class OkHttpUtils<T> {
    private static volatile OkHttpClient okHttpClient = null;
    private static volatile Semaphore semaphore = null;
    private Map<String, String> headerMap;
    private Map<String, String> paramMap;
    private String req;
    private String url;
    private Request.Builder request;

    /**
     * 初始化okHttpClient，并且允许https访问
     */
    private OkHttpUtils() {
        if (okHttpClient == null) {
            synchronized (OkHttpUtils.class) {
                if (okHttpClient == null) {

                    //设置代理方式
                   //Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("127.0.0.1", 8080));

                    TrustManager[] trustManagers = buildTrustManagers();
                    okHttpClient = new OkHttpClient.Builder()
                            //设置连接超时时间
                            .connectTimeout(15, TimeUnit.SECONDS)
                            //写入超时时间
                            .writeTimeout(20, TimeUnit.SECONDS)
                            //从连接成功到响应的总时间
                            .readTimeout(20, TimeUnit.SECONDS)
                            //跳过ssl认证(https)
                            .sslSocketFactory(createSSLSocketFactory(trustManagers), (X509TrustManager) trustManagers[0])
                            .hostnameVerifier((hostName, session) -> true)
                            .retryOnConnectionFailure(true)
//                            .proxy(proxy)//代理ip
                            //设置连接池  最大连接数量  , 持续存活的连接
                            .connectionPool(new ConnectionPool(50, 10, TimeUnit.MINUTES))
                            .build();
                    addHeader("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36");
                }
            }
        }
    }

    /**
     * 用于异步请求时，控制访问线程数，返回结果
     *
     * @return
     */
    private static Semaphore getSemaphoreInstance() {
        //只能1个线程同时访问
        synchronized (OkHttpUtils.class) {
            if (semaphore == null) {
                semaphore = new Semaphore(0);
            }
        }
        return semaphore;
    }

    /**
     * 创建OkHttpUtils
     *
     * @return
     */
    public static OkHttpUtils builder() {
        return new OkHttpUtils();
    }

    /**
     * 添加url
     *
     * @param url
     * @return
     */
    public OkHttpUtils url(String url) {
        this.url = url;
        return this;
    }

    /**
     * 添加参数,放入paramMap中
     *
     * @param key   参数名
     * @param value 参数值
     * @return
     */
    public OkHttpUtils addParam(String key, String value) {
        if (paramMap == null) {
            paramMap = new LinkedHashMap<>(16);
        }
        paramMap.put(key, value);
        return this;
    }

    /**
     * 添加参数
     *
     * @param T ，post请求时将入参转为json字符串
     * @return
     */
    public OkHttpUtils addParam(T t) {
        req = JSON.toJSONString(t);
        return this;
    }

    /**
     * 添加请求头
     *
     * @param key   参数名
     * @param value 参数值
     * @return
     */
    public OkHttpUtils addHeader(String key, String value) {
        if (headerMap == null) {
            headerMap = new LinkedHashMap<>(16);
        }
        headerMap.put(key, value);
        return this;
    }

    /**
     * 初始化get方法
     *
     * @return
     */
    public OkHttpUtils get() {
        request = new Request.Builder().get();
        StringBuilder urlBuilder = new StringBuilder(url);
        if (paramMap != null) {
            urlBuilder.append("?");
            try {
                for (Map.Entry<String, String> entry : paramMap.entrySet()) {
                    urlBuilder.append(URLEncoder.encode(entry.getKey(), "utf-8")).
                            append("=").
                            append(URLEncoder.encode(entry.getValue(), "utf-8")).
                            append("&");
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            urlBuilder.deleteCharAt(urlBuilder.length() - 1);
        }
        request.url(urlBuilder.toString());
        return this;
    }

    /**
     * 初始化post方法
     *
     * @param isJsonPost true等于json的方式提交数据，类似postman里post方法的raw
     *                   false等于普通的表单提交
     * @return
     */
    public OkHttpUtils post(boolean isJsonPost) {
        RequestBody requestBody;
        if (isJsonPost) {
            String json = "";
            if (paramMap != null) {
                json = JSON.toJSONString(paramMap);
            }
            if(req != null){
                json = req;
            }
            requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), json);
        } else {
            FormBody.Builder formBody = new FormBody.Builder();
            if (paramMap != null) {
                paramMap.forEach(formBody::add);
            }
            requestBody = formBody.build();
        }
        request = new Request.Builder().post(requestBody).url(url);
        return this;
    }

    public OkHttpUtils put() {
        String json = "";
        if (paramMap != null) {
            json = JSON.toJSONString(paramMap);
        }
        RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), json);

        request = new Request.Builder().put(requestBody).url(url);
        return this;
    }
    public OkHttpUtils del() {
        String json = "";
        if (paramMap != null) {
            json = JSON.toJSONString(paramMap);
        }
        RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), json);
        request = new Request.Builder().delete(requestBody).url(url);
        return this;
    }

    /**
     * 同步请求
     * 返回response,可以获取响应头信息
     * @return
     */
    public Response sync() {
        setHeader(request);
        Response response = null;
        try {
            response = okHttpClient.newCall(request.build()).execute();
            assert response.body() != null;
            return response;
        } catch (IOException e) {
            e.printStackTrace();
            //return "请求失败：" + e.getMessage();
        }
        return response;
    }
    /*public String sync() {
        setHeader(request);
        try {
            Response response = okHttpClient.newCall(request.build()).execute();
            assert response.body() != null;
            return response.body().string();
        } catch (IOException e) {
            e.printStackTrace();
            return "请求失败：" + e.getMessage();
        }
    }*/


    /**
     * 异步请求，有返回值
     */
    public String async() {
        StringBuilder buffer = new StringBuilder("");
        setHeader(request);
        okHttpClient.newCall(request.build()).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                buffer.append("请求出错：").append(e.getMessage());
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                assert response.body() != null;
                buffer.append(response.body().string());
                getSemaphoreInstance().release();
            }
        });
        try {
            getSemaphoreInstance().acquire();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return buffer.toString();
    }

    /**
     * 异步请求，带有接口回调
     *
     * @param callBack
     */
    public void async(ICallBack callBack) {
        setHeader(request);
        okHttpClient.newCall(request.build()).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                callBack.onFailure(call, e.getMessage());
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                assert response.body() != null;
                callBack.onSuccessful(call, response.body().string());
            }
        });
    }

    /**
     * 为request添加请求头
     *
     * @param request
     */
    private void setHeader(Request.Builder request) {
        if (headerMap != null) {
            try {
                for (Map.Entry<String, String> entry : headerMap.entrySet()) {
                    request.addHeader(entry.getKey(), entry.getValue());
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }


    /**
     * 生成安全套接字工厂，用于https请求的证书跳过
     *
     * @return
     */
    private static SSLSocketFactory createSSLSocketFactory(TrustManager[] trustAllCerts) {
        SSLSocketFactory ssfFactory = null;
        try {
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, trustAllCerts, new SecureRandom());
            ssfFactory = sc.getSocketFactory();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return ssfFactory;
    }

    private static TrustManager[] buildTrustManagers() {
        return new TrustManager[]{
                new X509TrustManager() {
                    @Override
                    public void checkClientTrusted(X509Certificate[] chain, String authType) {
                    }

                    @Override
                    public void checkServerTrusted(X509Certificate[] chain, String authType) {
                    }

                    @Override
                    public X509Certificate[] getAcceptedIssuers() {
                        return new X509Certificate[]{};
                    }
                }
        };
    }

    /**
     * 自定义一个接口回调
     */
    public interface ICallBack {

        void onSuccessful(Call call, String data);

        void onFailure(Call call, String errorMsg);

    }
}

 

测试代码

 get请求

    public static void main(String[] args) throws IOException {
        Response response = OkHttpUtils.builder().url("http://www.baidu.com")
                .addHeader("test", "test000")
                .addParam("test1", "test111")
                .addParam("test2", "test222")
                .get().sync();
        String res = response.body().string();
        System.out.println("请求返回结果："+ res.substring(0,50));
        System.out.println("请求头结果："+response.headers().toString().substring(0,50));
        System.out.println("获取某一个请求头："+response.header("Content-Type"));

    }

 

get请求，接口返回对象

@RestController
public class OkHttpTest {

    @GetMapping("okHttpTest1")
    public Student test01(){
        Student stu = new Student();
        stu.setName("小明");
        stu.setAge(20);
        return stu;
    }
}

public class OkhttpTest {
    public static void main(String[] args) throws IOException {
        Response response = OkHttpUtils.builder().url("http://localhost:8080/okHttpTest1")
                .addHeader("test", "test000")
                .addParam("test1", "test111")
                .addParam("test2", "test222")
                .get().sync();
        String res = response.body().string();
        System.out.println("请求返回结果："+ res);
        System.out.println("请求头结果："+response.headers());
        System.out.println("获取某一个请求头："+response.header("Content-Type"));

    }
}

 

POST请求

分步组装json入参

   @PostMapping("okHttpTest2")
    public Student test02(@RequestBody Student student, HttpServletRequest request){
        String token = request.getHeader("token");
        System.out.println(token);
        Student stu = new Student();
        stu.setName(student.getName());
        stu.setAge(student.getAge());
        return stu;
    }

   public static void main(String[] args) throws IOException {
        Response response = OkHttpUtils.builder().url("http://localhost:8080/okHttpTest2")
                .addHeader("token", "erwefsdf23124")
                .addParam("name", "zhangsan")
                .addParam("age", "22")
                .post(true) // true 为json提交方式
                .sync();

        String res = response.body().string();
        System.out.println("请求返回结果："+ res);
        System.out.println("请求头结果："+response.headers());
        System.out.println("获取某一个请求头："+response.header("Content-Type"));

    }

 

 

入参传入对象形式，只能传一个对象

public static void main(String[] args) throws IOException {
        Student stu = new Student();
        stu.setName("小明");
        stu.setAge(15);
        Response response = OkHttpUtils.builder().url("http://localhost:8080/okHttpTest2")
                .addHeader("token", "erwefsdf23124")
                .addParam(stu)
                .post(true) // true 为json提交方式
                .sync();

        String res = response.body().string();
        System.out.println("请求返回结果："+ res);
        System.out.println("请求头结果："+response.headers());
        System.out.println("获取某一个请求头："+response.header("Content-Type"));

    }