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

 1 package com.example.toas;
 2 
 3 import androidx.appcompat.app.AppCompatActivity;
 4 
 5 import android.graphics.Bitmap;
 6 import android.graphics.BitmapFactory;
 7 import android.os.Build;
 8 import android.os.Bundle;
 9 import android.os.Environment;
10 import android.os.Handler;
11 import android.os.Message;
12 import android.os.StrictMode;
13 import android.view.View;
14 import android.widget.Button;
15 import android.widget.ImageView;
16 import android.widget.TextView;
17 import android.widget.Toast;
18 
19 import java.io.BufferedReader;
20 import java.io.File;
21 import java.io.FileNotFoundException;
22 import java.io.FileOutputStream;
23 import java.io.FileReader;
24 import java.io.IOException;
25 import java.io.InputStream;
26 import java.io.OutputStream;
27 import java.net.HttpURLConnection;
28 import java.net.MalformedURLException;
29 import java.net.URL;
30 import java.net.URLConnection;
31 
32 public class MainActivity extends AppCompatActivity {
33     private TextView trytxt;
34     private Button btnt;
35     private Button btni;
36     private ImageView trypng;
37     private Bitmap bitmap;
38     private MyHandle myHandler;
39     @Override
40     protected void onCreate(Bundle savedInstanceState) {
41         super.onCreate(savedInstanceState);
42         setContentView(R.layout.activity_main);
43 
44         trytxt = (TextView)findViewById(R.id.trytxt);
45         trypng = (ImageView)findViewById(R.id.trypng);
46         btnt = (Button)findViewById(R.id.btnt);
47         btni = (Button)findViewById(R.id.btni);
48         myHandler = new MyHandle();
49 
50         btni.setOnClickListener(new View.OnClickListener() {
51             @Override
52             public void onClick(View v) {
53                 DownloadImageRunner runnerble = new DownloadImageRunner();
54                 new Thread(runnerble).start();
55             }
56         });
57     }
58 
59     private class DownloadImageRunner implements Runnable{
60         public void run(){
61             Message msg = new Message();
62             msg.what = 1;
63             try{
64                 URL url = new URL("http://39.101.190.190:8080/usr/local/CloudNote/Image/try_image1_20200511114113.png");
65                 HttpURLConnection conn;
66                 conn = (HttpURLConnection)url.openConnection();
67                 conn.setConnectTimeout(6000);
68                 conn.setDoInput(true);
69                 conn.setUseCaches(false);
70                 InputStream is = conn.getInputStream();
71                 bitmap = BitmapFactory.decodeStream(is);
72                 is.close();
73             } catch (MalformedURLException e) {
74                 msg.what=0;
75                 e.printStackTrace();
76             } catch (IOException e) {
77                 msg.what=0;
78                 e.printStackTrace();
79             }
80             myHandler.sendMessage(msg);
81         }
82     }
83     private class MyHandle extends Handler {
84         public void HandleMessage(Message msg){
85             super.handleMessage(msg);
86             if(msg.what==1){
87                 trypng.setImageBitmap(bitmap);
88             }else{
89                 Toast.makeText(MainActivity.this,"获取图片失败",Toast.LENGTH_SHORT).show();
90             }
91         }
92     }
93 }

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。