简介
OKhttp3是一个高效、节省带宽、支持HTTP2的HTTP客户端。
传送门：
GitHub：https://github.com/square/okhttp
官网：https://square.github.io/okhttp/
引入框架
在build.gradle（app）中的dependencies节点下添加：
implementation(“com.squareup.okhttp3:okhttp:4.1.1”)
dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'androidx.appcompat:appcompat:1.0.2' implementation 'androidx.constraintlayout:constraintlayout:1.1.3' testImplementation 'junit:junit:4.12' androidTestImplementation 'androidx.test:runner:1.1.1' androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1' //OKhttp implementation("com.squareup.okhttp3:okhttp:4.1.1")} 后端环境
后端我是用Tomcat+sevlet实现的后端服务器，主要代码如下
MyServlet.class
package com.dimanche;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.google.gson.Gson;import com.sun.org.apache.bcel.internal.generic.NEW;/** * Servlet implementation class MyServlet */@WebServlet("/MyServlet")public class MyServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println("get请求");PrintWriter out = response.getWriter();String method = request.getParameter("method");// 获取方法User user = new User("111", "test", "test");Result result = new Result();result.setResult("true");result.setObject(user);out.println(new Gson().toJson(result));}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println("post请求");PrintWriter out = response.getWriter();String method = request.getParameter("method");// 获取方法System.out.println("表单"+method);StringBuffer json = new StringBuffer();String line = null;BufferedReader reader = request.getReader();while ((line = reader.readLine()) != null) {json.append(line);}System.out.println("字符串"+json.toString());// 逻辑操作过程// 返回计算结果User user = new User("111", "test", "test");Result result = new Result();result.setResult("true");result.setObject(user);out.println(new Gson().toJson(result));}}
Result.class
package com.dimanche;public class Result {String result;Object object;public String getResult() {return result;}public void setResult(String result) {this.result = result;}public Object getObject() {return object;}public void setObject(Object object) {this.object = object;}}
User.class
package com.dimanche;public class User {private String id;private String userName;private String userCode;public User(String id, String userName, String userCode) {this.id = id;this.userName = userName;this.userCode = userCode;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getUserCode() {return userCode;}public void setUserCode(String userCode) {this.userCode = userCode;}}
代码已上传百度云：
链接：https://pan.baidu.com/s/1XgBADUtPruig5wLZkULjTw
提取码：53e2
OKhttp的简单使用 说明
url地址为：
public static final String BASE_URL = “http://192.168.18.1:8088/MyJspProject/MyServlet”;
其中的192.168.18.1:8088为我电脑的ip加端口，你们修改为自己的即可
使用OKhttp进行异步get请求 public static void getData(String url) { OkHttpClient okHttpClient = new OkHttpClient(); Request request = new Request.Builder() .url(url)//值得顶地址 .get()//指定请求方式 .build(); //获取Call对象 Call call = okHttpClient.newCall(request); //开启请求,使用execute时同步请求，使用enqueue时异步请求 call.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { //访问失败 Log.e("异步get请求失败", e.getMessage()); } @Override public void onResponse(Call call, Response response) throws IOException { //访问成功 Log.e("异步get请求成功", response.body().string()); } }); } 使用Post异步提交字符串 public static void subString(String url) { //声明提交的数据类型 MediaType mediaType = MediaType.parse("text/x-markdown; charset=utf-8"); //声明RequestBody RequestBody body = RequestBody.create(mediaType, "我被提交啦，哈哈哈哈"); //声明OkHTTPClient对象 OkHttpClient okHttpClient = new OkHttpClient(); //创建Request对象 Request request = new Request.Builder() .url(url)//指定访问地址 .post(body)//指定请求方式 .build(); //获取Call对象 Call call = okHttpClient.newCall(request); call.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { //访问失败 Log.e("异步Post请求失败", e.getMessage()); } @Override public void onResponse(Call call, Response response) throws IOException { //访问成功 Log.e("异步psot请求成功", response.body().string()); } }); } 使用post异步提交表单 public static void subForm(String url) { //创建OKhttpClient对象 OkHttpClient okHttpClient = new OkHttpClient.Builder() .addInterceptor(new TestInterceptor()) .build(); //创建RequestBody，使用FormBody描述请求体 RequestBody requestBody = new FormBody.Builder() .add("method", "login")//添加参数 .build(); //创建Request对象 Request request = new Request.Builder() .url(url)//指定地址 .post(requestBody)//指定访问方式并且加入请求体 .build(); //获取Call对象 Call call = okHttpClient.newCall(request); //开始请求 call.enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { Log.e("提交表单失败", "" + e.getMessage()); } @Override public void onResponse(Call call, Response response) throws IOException { Log.e("提交表单成功", "" + response.body().string()); } }); }
其中TestInterceptor为拦截器，代码如下
package com.dimanche.okhttp3.okhttp;import android.util.Log;import java.io.IOException;import okhttp3.Interceptor;import okhttp3.Request;import okhttp3.Response;/** * Created by Dimanche on 2019/7/25. * 创建拦截器类并且实现Interceptor接口，重写intercept方法 */public class TestInterceptor implements Interceptor { @Override public Response intercept(Chain chain) throws IOException { Request request=chain.request();//获取Request String url=request.url().url().toString(); Log.e("请求的地址：",url); return chain.proceed(request); }}