OkHttp3的基本使用
转 https://blog.csdn.net/yu805894501/article/details/100670409
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);
}
}