团队开发冲刺第二阶段（一）

　　今日尝试进行从服务器端获取文件数据，并显示内容，失败。

　　失败原因：文件未找到。下面给出代码

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.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 MyHandle myHandler;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        trytxt = (TextView)findViewById(R.id.trytxt);
        trypng = (ImageView)findViewById(R.id.trypng);
        btnt = (Button)findViewById(R.id.btnt);
        btni = (Button)findViewById(R.id.btni);
        myHandler = new MyHandle();

        btni.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                DownloadImageRunner runnerble = new DownloadImageRunner();
                new Thread(runnerble).start();
            }
        });
    }

    private class DownloadImageRunner implements Runnable{
        public void run(){
            Message msg = new Message();
            msg.what = 1;
            try{
                URL url = new URL("http://39.101.190.190:8080/usr/local/CloudNote/Image/try_image1_20200511114113.png");
                HttpURLConnection conn;
                conn = (HttpURLConnection)url.openConnection();
                conn.setConnectTimeout(6000);
                conn.setDoInput(true);
                conn.setUseCaches(false);
                InputStream is = conn.getInputStream();
                bitmap = BitmapFactory.decodeStream(is);
                is.close();
            } catch (MalformedURLException e) {
                msg.what=0;
                e.printStackTrace();
            } catch (IOException e) {
                msg.what=0;
                e.printStackTrace();
            }
            myHandler.sendMessage(msg);
        }
    }
    private class MyHandle extends Handler {
        public void HandleMessage(Message msg){
            super.handleMessage(msg);
            if(msg.what==1){
                trypng.setImageBitmap(bitmap);
            }else{
                Toast.makeText(MainActivity.this,"获取图片失败",Toast.LENGTH_SHORT).show();
            }
        }
    }
}

代码非常简单，报错原因是连接上出现了java.io.FileNotFoundException: http://39.101.190.190:8080/usr/local/CloudNote/Image/try_image1_20200511114113.png错误，一开始我尝试使用本地的Tomcat进行图片显示尝试未能成功，这里换上的ip地址是我们团队的服务器地址，连接同样未能实现。由于时间有点晚只能做出失败总结，明日会排查错误并着手设计个人笔记排版。