第十五周总结

　　本周的代码量很多。php大作业舍友完成了大部分模块，我需要把剩下的内容补齐。主要是家电购物界面的php展示。这里仅仅展现一下大项目的结构图：
之后就是Android方面的代码编写，因为大部分时间都去写php了，安卓写的相对少了一些：
首先就是在app中读取服务器端文件，之前一直没解决，后来才发现是tomcat需要设置虚拟路径。。。
改进代码如下：
  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.InputStreamReader;
 27 import java.io.OutputStream;
 28 import java.net.HttpURLConnection;
 29 import java.net.MalformedURLException;
 30 import java.net.URL;
 31 import java.net.URLConnection;
 32 
 33 public class MainActivity extends AppCompatActivity {
 34     private TextView trytxt;
 35     private Button btnt;
 36     private Button btni;
 37     private ImageView trypng;
 38     private Bitmap bitmap;
 39     private Myhandler handler1;
 40     class Myhandler extends Handler{
 41         public void handleMessage(Message msg){
 42             trypng = (ImageView)findViewById(R.id.trypng);
 43             trypng.setImageBitmap((Bitmap)msg.obj);
 44         }
 45     }
 46     @Override
 47     protected void onCreate(Bundle savedInstanceState) {
 48         super.onCreate(savedInstanceState);
 49         setContentView(R.layout.activity_main);
 50 
 51         btni = (Button)findViewById(R.id.btni);
 52         btnt = (Button)findViewById(R.id.btnt);
 53         trytxt = (TextView)findViewById(R.id.trytxt);
 54         handler1 = new Myhandler();
 55         btni.setOnClickListener(new View.OnClickListener() {
 56             @Override
 57             public void onClick(View v) {
 58                 new Thread(new Runnable() {
 59                     @Override
 60                     public void run() {
 61                         try{
 62                             String path="http://39.101.190.190:8080/filesource/Image/try_image1_20200511114113.png";
 63                             URL url = new URL(path);
 64                             HttpURLConnection conn = (HttpURLConnection)url.openConnection();
 65                             conn.setRequestMethod("GET");
 66                             conn.setConnectTimeout(8000);
 67                             conn.setReadTimeout(8000);
 68                             conn.connect();
 69                             if(conn.getResponseCode()==200){
 70                                 InputStream is = conn.getInputStream();
 71                                 Bitmap bm = BitmapFactory.decodeStream(is);
 72                                 Message msg = new Message();
 73                                 msg.obj = bm;
 74                                 handler1.sendMessage(msg);
 75                             }
 76                         } catch (MalformedURLException e) {
 77                             e.printStackTrace();
 78                         } catch (IOException e) {
 79                             e.printStackTrace();
 80                         }
 81                     }
 82                 }).start();
 83             }
 84         });
 85 
 86         btnt.setOnClickListener(new View.OnClickListener() {
 87             @Override
 88             public void onClick(View v) {
 89                 new Thread(new Runnable() {
 90                     @Override
 91                     public void run() {
 92                         String txtpath = "http://39.101.190.190:8080/filesource/Note/try_note_20200511114113.txt";
 93                         try{
 94                             URL turl = new URL(txtpath);
 95                             HttpURLConnection cont = (HttpURLConnection)turl.openConnection();
 96                             cont.setReadTimeout(8000);
 97                             cont.setConnectTimeout(8000);
 98                             cont.connect();
 99                             InputStream input = cont.getInputStream();
100                             BufferedReader in = new BufferedReader(new InputStreamReader(input));
101                             String line = null;
102                             StringBuffer sb = new StringBuffer();
103                             while((line = in.readLine())!=null){
104                                 sb.append(line);
105                             }
106                         } catch (MalformedURLException e) {
107                             e.printStackTrace();
108                         } catch (IOException e) {
109                             e.printStackTrace();
110                         }
111                     }
112                 }).start();
113             }
114         });
115     }
116 }
基本实现了读取功能，往后就是设计ListView了。