Android Studio OkHttpClient使用

本次来记录下OkHttpClient的使用，OkHttpClient是用来完成android 客户端对服务端请求的工具。

首先记住，使用网络的时候一定要加入权限，加入到AndroidMainfest.xml中

  <uses-permission android:name="android.permission.INTERNET" />

在初次使用的时候会出现报错。cannot resolve symbol OkHttpClient

这里需要引入

    implementation 'com.squareup.okhttp3:okhttp:3.0.1'

然后刷新下项目就可以了。

代码：

package com.example.administrator.testclient;

import com.squareup.*;

import java.io.IOException;

import okhttp3.FormBody;

import okhttp3.MediaType;

import okhttp3.OkHttpClient;

import okhttp3.Request;

import okhttp3.RequestBody;

import okhttp3.Response;

public  class BaseHttpClient {

    public static final MediaType MEDIA_TYPE_MARKDOWN

            = MediaType.parse("text/x-markdown; charset=utf-8");

    // 01. 定义okhttp

    private  final  OkHttpClient client  = new OkHttpClient();

    public BaseHttpClient(){

        //client.connectTimeoutMillis();

    }

    /**

     * 发送一个表单请求

     * @throws Exception

     */

    public void SendForm() throws Exception {

        RequestBody formBody = new FormBody.Builder()

                .add("search", "Jurassic Park")

                .build();

        Request request = new Request.Builder()

                .url("https://en.wikipedia.org/w/index.php")

                .post(formBody)

                .build();

        Response response = client.newCall(request).execute();

        if (!response.isSuccessful())

            throw new IOException("Unexpected code " + response);

        System.out.println(response.body().string());

    }

    /**POST 请求

     * 发送一个string请求

     * @throws Exception

     */

    public void SendPostString() throws Exception {

        String postBody = ""

                + "Releases\n"

                + "--------\n"

                + "\n"

                + " * _1.0_ May 6, 2013\n"

                + " * _1.1_ June 15, 2013\n"

                + " * _1.2_ August 11, 2013\n";

        Request request = new Request.Builder()

                .url("https://api.github.com/markdown/raw")

                .post(RequestBody.create(MEDIA_TYPE_MARKDOWN, postBody))

                .build();

        Response response = client.newCall(request).execute();

        if (!response.isSuccessful())

            throw new IOException("Unexpected code " + response);

        System.out.println(response.body().string());

    }

    /**POST 请求

     * 发送一个From请求

     * @throws Exception

     */

    public   void SendPostFrom() throws Exception {

        RequestBody body = new FormBody.Builder()

                .add("name", "sy")//添加参数体

                .add("age", "18")

                .build();

        Request request = new Request.Builder()

                .post(body) //请求参数

                .url("http://123.207.70.54:8080/SpringMvc/hello")

                .build();

        Response response = client.newCall(request).execute();

        if (!response.isSuccessful())

            throw new IOException("Unexpected code " + response);

    }

    /**Get请求

     * 发送一个From请求

     * @throws Exception

     */

    public void SendGetFrom() throws Exception {

        Request request = new Request.Builder()

                .get() //请求参数

                .url("http://123.207.70.54:8080/SpringMvc/hello")

                .build();

        Response response = client.newCall(request).execute();

        if (!response.isSuccessful())

            throw new IOException("Unexpected code " + response);

    }

}

测试发现，上面的用不了，下面放一个测试通过的方法：

    public void getDatasyncFactory(){

                new Thread(new Runnable() {

                    @Override

                    public void run() {

                        try {

                            OkHttpClient client = new OkHttpClient();//创建OkHttpClient对象

                            Request request = new Request.Builder()

                                    .url("http://123.207.70.54:8080/SpringMvc/hello")//请求接口。如果需要传参拼接到接口后面。

                                    .build();//创建Request 对象

                            Response response = null;

                            response = client.newCall(request).execute();//得到Response 对象

                            if (response.isSuccessful()) {

                                Log.d("kwwl","response.code()=="+response.code());

                                Log.d("kwwl","response.message()=="+response.message());

                                Log.d("kwwl","res=="+response.body());

                                //此时的代码执行在子线程，修改UI的操作请使用handler跳转到UI线程。

                            }

                        } catch (Exception e) {

                            e.printStackTrace();

                        }

                    }

                }).start();

            }

返回信息：