Android客户端OkHttp的使用以及tomcat服务器的解析客户端发过来的数据

2020-02-15 21:25:42

### android客户端客户向服务器发送json字符串或者以参数请求的方式发送数据

其中又分为post请求和get请求

1.activity.xml

 <?xml version="1.0" encoding="utf-8"?>

 <LinearLayout

     xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:app="http://schemas.android.com/apk/res-auto"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="match_parent"

     android:background="#FFF"

     android:orientation="vertical"

     android:layout_height="match_parent">

     <TextView

         android:id="@+id/tv_okhttp"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:text="abcdef"/>

     <Button

         android:id="@+id/button_activity7"

         android:background="@drawable/testt"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content" />

     <Button

         android:id="@+id/button_activity7_2"

         android:background="@drawable/testt"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content" />

 </LinearLayout>

2.mainactivity.java

package com.lianggao.whut.thirdtest;

import android.app.Activity;

import android.os.AsyncTask;

import android.os.Bundle;

import android.os.Handler;

import android.os.Looper;

import android.os.Message;

import android.support.annotation.NonNull;

import android.support.annotation.Nullable;

import android.support.design.widget.BottomNavigationView;

import android.support.v4.app.FragmentActivity;

import android.support.v4.view.ViewPager;

import android.util.Log;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ProgressBar;

import android.widget.TextView;

import android.widget.Toast;

import com.google.gson.Gson;

import org.json.JSONStringer;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import okhttp3.Call;

import okhttp3.Callback;

import okhttp3.FormBody;

import okhttp3.MediaType;

import okhttp3.OkHttpClient;

import okhttp3.Request;

import okhttp3.RequestBody;

import okhttp3.Response;

public class MainActivity7 extends Activity implements View.OnClickListener {

    private static final String TAG = "MainActivity7";

    private Button btn_login;

    private EditText editText_name;

    private EditText editText_age;

    private ProgressBar progressBar;

    private TextView tv_okhttp;

    private OkHttpClient client=new OkHttpClient();

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main7);

        findViewById(R.id.button_activity7).setOnClickListener(this);

        findViewById(R.id.button_activity7_2).setOnClickListener(this);

        tv_okhttp=(TextView)findViewById(R.id.tv_okhttp);

    }

　　//忽略这里，这里是用HttpURLConnection进行Get请求的，传递的是参数

    private String getUserInfo(String userid){

        String path="http://192.168.1.8:8080/com.lianggao.whut/Get_Resopnce_Servlet?name=lianggao&&age="+userid;

        try {

            URL url=new URL(path);

            HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection();

            httpURLConnection.setConnectTimeout(5000);

            httpURLConnection.setRequestMethod("GET");

            if(httpURLConnection.getResponseCode()==200){

                InputStream is=httpURLConnection.getInputStream();

                return dealResponseResult(is);

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }

    private String dealResponseResult(InputStream inputStream){

        String resultData=null;

        ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();

        byte[] data=new byte[1024];

        int len=0;

        try {

            while((len = inputStream.read(data))!= -1){

                byteArrayOutputStream.write(data,0,len);

            }

        } catch (IOException e) {

            e.printStackTrace();

        }

        resultData=new String(byteArrayOutputStream.toByteArray());

        return resultData;

    }

　　//忽略这里是用HttpUrlConnection来post请求的，传递的是json转换的字符流

    private String login(String username,String password){

        String path="http://192.168.1.8:8080/com.lianggao.whut/Get_Resopnce_Servlet";

        try {

            URL url=new URL(path);

            HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection();

            httpURLConnection.setConnectTimeout(5000);

            httpURLConnection.setRequestMethod("POST");

            String data="{'name':'lianggao','age':12}";

            httpURLConnection.setDoOutput(true);

            httpURLConnection.setRequestProperty("Content-Type","text/json;charset=utf-8");

            OutputStream outputStream=httpURLConnection.getOutputStream();

            outputStream.write(data.getBytes());

            if(httpURLConnection.getResponseCode()==200){

                InputStream is=httpURLConnection.getInputStream();

                return dealResponseResult(is);

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }

    @Override

    public void onClick(View v) {

        new TestGetOrPostThread(v).start();

    }

    public class TestGetOrPostThread extends Thread{

        private View view ;

        public TestGetOrPostThread(View view){

            this.view=view;

        }

        @Override

        public void run() {

            switch (view.getId()){

                case R.id.button_activity7:

                    /*String getResult=getUserInfo("12");

                    Log.i("MainActivity","get获取用户信息"+getResult);*/

                    //getUserInfo();

                    break;

                case R.id.button_activity7_2:

                   /* String getResult2=login("lianggao","12");

                    Log.i("MainActivity","post登录结果"+getResult2);*/

                    login2();

                    break;

            }

        }

    }

    //get请求，参数已经写好name,age，在服务器端可以直接得到请求参数来获得

    private void getUserInfo(){

        Request.Builder builder=new Request.Builder().url("http://192.168.1.8:8080/com.lianggao.whut/Get_Resopnce_Servlet?name=lianggao&&age=12");

        execute(builder);

    }

    private void execute(Request.Builder builder){

        Call call=client.newCall(builder.build());

        call.enqueue(callcack);

    }

    private Callback callcack=new Callback(){

        @Override

        public void onFailure(Call call, IOException e) {

            Log.i("MainActivity","onFailure");

            e.printStackTrace();

        }

        @Override

        public void onResponse(Call call, Response response) throws IOException {

            String str=new String(response.body().bytes(),"utf-8");

            Log.i("MainActivity","onResponse"+str);

            android.os.Message message= Handlerokhttp.obtainMessage();

            message.obj=str;

            message.sendToTarget();

        }

    };

    private Handler Handlerokhttp=new Handler(){

        @Override

        public void handleMessage(Message msg) {

            String result=(String)msg.obj;

            Gson gson=new Gson();

            User user=gson.fromJson(result,User.class);

            tv_okhttp.setText(user.getName()+user.getAge());

        }

    };

    //post请求传递参数

    private void login(){

        FormBody.Builder formBuilder=new FormBody.Builder();

        formBuilder.add("name","lianggao");

        formBuilder.add("age","12");

        RequestBody requestBody=formBuilder.build();

        Request.Builder builder=new Request.Builder().url("http://192.168.1.8:8080/com.lianggao.whut/Get_Resopnce_Servlet").post(requestBody);

        execute(builder);

    }

    //post请求传递json转换的流，在服务器端需要用GSON解析出来，

    private void login2(){

        String str="{'name':'lianggao','age':12}";

        MediaType JSON=MediaType.parse("application/json; charset=utf-8");

        RequestBody requestBody2=RequestBody.create(JSON,str);

        Request.Builder request=new Request.Builder().url("http://192.168.1.8:8080/com.lianggao.whut/Get_Resopnce_Servlet").post(requestBody2);

        execute(request);

    }

}

3.服务器端

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

//接收参数

/*

try {

            if(request.getParameter("name").trim()!=null&&request.getParameter("age")!=null) {

                String name=request.getParameter("name").trim();

                int age=Integer.parseInt(request.getParameter("age"));

                String jsonStr="";

                Gson  gson=new Gson();

                if(name.equals("lianggao")&&age==12) {

                    User2 user=new User2();

                    user.setAge(age);

                    user.setName(name);

                    user.setResult("true");

                    jsonStr=gson.toJson(user);

                } else {

                    User2 user=new User2();

                    user.setAge(age);

                    user.setName(name);

                    user.setResult("false");

                    jsonStr=gson.toJson(user);

                }

                response.getWriter().append(jsonStr);

                return;

            }

        } catch (Exception e) {

            // TODO: handle exception

        }

*/

        //接收json流

        response.setContentType("application/json;charset=utf-8");//这里可能修改为text/json

        String message;

        User user ;

        try {

            BufferedReader br=new BufferedReader(new InputStreamReader(request.getInputStream(),"UTF-8"));

            StringBuffer sb=new StringBuffer("");

            String temp;

            while((temp=br.readLine())!=null) {

                sb.append(temp);

            }

            br.close();

            message=sb.toString();

            System.out.println("请求报文"+message);

            Gson gson=new Gson();

            user=gson.fromJson(message, User.class);

            if((user.getName().equals("lianggao"))&&(user.getAge()==12)){

                User2 user2=new User2();

                user2.setAge(user.getAge());

                user2.setName(user.getName());

                user2.setResult("true");

                String  jsonStr=gson.toJson(user2);

                response.getWriter().append(jsonStr);

                return;

            }else {

                User2 user2=new User2();

                user2.setAge(user.getAge());

                user2.setName(user.getName());

                user2.setResult("false");

                String  jsonStr=gson.toJson(user2);

                response.getWriter().append(jsonStr);

                return;

            }

        } catch (Exception e) {

            // TODO: handle exception

        }

    }

}

参考链接：

https://www.cnblogs.com/luckyplj/p/10734458.html

javaweb Servlet接收Android请求，并返回json数据

https://www.jianshu.com/p/37e0daa57dd4

OkHttp之post请求发送给服务器json

https://www.jianshu.com/p/37e0daa57dd4

简单测试get和post请求

巴特西

Android客户端OkHttp的使用以及tomcat服务器的解析客户端发过来的数据

javaweb Servlet接收Android请求，并返回json数据

OkHttp之post请求发送给服务器json

简单测试get和post请求

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