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