团队开发冲刺第二阶段（二）

　　昨日问题解决：要通过tomcat访问文件需要在tomcat下的conf目录配置server.xml：

 改进后代码如下：

package com.example.toas;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.os.StrictMode;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class MainActivity extends AppCompatActivity {
    private TextView trytxt;
    private Button btnt;
    private Button btni;
    private ImageView trypng;
    private Bitmap bitmap;
    private Myhandler handler1;
    class Myhandler extends Handler{
        public void handleMessage(Message msg){
            trypng = (ImageView)findViewById(R.id.trypng);
            trypng.setImageBitmap((Bitmap)msg.obj);
        }
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btni = (Button)findViewById(R.id.btni);
        btnt = (Button)findViewById(R.id.btnt);
        trytxt = (TextView)findViewById(R.id.trytxt);
        handler1 = new Myhandler();
        btni.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try{
                            String path="http://39.101.190.190:8080/filesource/Image/try_image1_20200511114113.png";
                            URL url = new URL(path);
                            HttpURLConnection conn = (HttpURLConnection)url.openConnection();
                            conn.setRequestMethod("GET");
                            conn.setConnectTimeout(8000);
                            conn.setReadTimeout(8000);
                            conn.connect();
                            if(conn.getResponseCode()==200){
                                InputStream is = conn.getInputStream();
                                Bitmap bm = BitmapFactory.decodeStream(is);
                                Message msg = new Message();
                                msg.obj = bm;
                                handler1.sendMessage(msg);
                            }
                        } catch (MalformedURLException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }).start();
            }
        });

        btnt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        String txtpath = "http://39.101.190.190:8080/filesource/Note/try_note_20200511114113.txt";
                        try{
                            URL turl = new URL(txtpath);
                            HttpURLConnection cont = (HttpURLConnection)turl.openConnection();
                            cont.setReadTimeout(8000);
                            cont.setConnectTimeout(8000);
                            cont.connect();
                            InputStream input = cont.getInputStream();
                            BufferedReader in = new BufferedReader(new InputStreamReader(input));
                            String line = null;
                            StringBuffer sb = new StringBuffer();
                            while((line = in.readLine())!=null){
                                sb.append(line);
                            }
                        } catch (MalformedURLException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }).start();
            }
        });
    }
}

效果如下：

 未能解决问题：读取txt文件可以实现，也能拿出其中的内容，但是在改变View控件上出现问题，原因是线程问题，明日任务：编写线程。