Android Studio OkHttpClient使用教程详解

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：

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