先测试网络功能,新建一个NetHandler类继承Handler类并重写handlerMessage()方法,然后新建一个NetThread类实现Runnable接口用于实现网络连接,然后在handlerMessage()中实现接受Web端的数据并Toast出来

在这里,Web端print的是一个json型的字符串,所以Android端接受到这个字符串要进行解析,这里使用的是alibaba的fastjson库:implementation group: 'com.alibaba', name: 'fastjson', version: '1.2.75'

经过测试,成功Toast出数据库中对应md5码的pwd

CloudKey/app/build.gradle

@@ -36,4 +36,5 @@ dependencies {
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    implementation group: 'com.alibaba', name: 'fastjson', version: '1.2.75'
 }

CloudKey/app/src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.thankvinci.CloudKey">
-
+    <uses-permission android:name="android.permission.INTERNET"/>
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

CloudKey/app/src/main/java/com/thankvinci/CloudKey/MainActivity.java

@@ -3,6 +3,12 @@ package com.thankvinci.CloudKey;
 import androidx.appcompat.app.AppCompatActivity;
 
 import android.os.Bundle;
+import android.os.Handler;
+import android.view.View;
+import android.widget.TextView;
+
+import com.thankvinci.CloudKey.NetUtils.NetHandler;
+import com.thankvinci.CloudKey.NetUtils.NetThread;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -10,5 +16,14 @@ public class MainActivity extends AppCompatActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        Handler handler = new NetHandler(this);
+        TextView textView = findViewById(R.id.text);
+        textView.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Thread t = new Thread(new NetThread(handler));
+                t.start();
+            }
+        });
     }
 }

CloudKey/app/src/main/java/com/thankvinci/CloudKey/NetUtils/NetHandler.java

@@ -0,0 +1,24 @@
+package com.thankvinci.CloudKey.NetUtils;
+
+import android.os.Handler;
+import android.os.Message;
+import android.widget.Toast;
+
+import com.thankvinci.CloudKey.MainActivity;
+
+
+public class NetHandler extends Handler {
+    private MainActivity activity;
+    public NetHandler(MainActivity activity){
+        this.activity = activity;
+    }
+    @Override
+    public void handleMessage(Message msg) {
+        super.handleMessage(msg);
+        switch (msg.what){
+            case 0:
+                Toast.makeText(activity,msg.getData().getString("key"),Toast.LENGTH_SHORT).show();
+                break;
+        }
+    }
+}

CloudKey/app/src/main/java/com/thankvinci/CloudKey/NetUtils/NetThread.java

@@ -0,0 +1,59 @@
+package com.thankvinci.CloudKey.NetUtils;
+
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+
+import androidx.loader.content.CursorLoader;
+
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+public class NetThread implements Runnable {
+    Handler handler;
+    public NetThread(Handler handler){
+        this.handler = handler;
+    }
+    @Override
+    public void run(){
+        Message msg = new Message();
+        String data = getNetWork("http://1.14.144.194:8080/cscp/cscp?function=query&MD5=123456789abcdef0123456789abcd4f0");
+        JSONObject jsonObject = JSON.parseObject(data);
+        Bundle dataPackage = new Bundle();
+        dataPackage.putString("key",jsonObject.getString("pwd"));
+        msg.what = 0;
+        msg.setData(dataPackage);
+        handler.sendMessage(msg);
+    }
+    public String getNetWork(String str_url){
+        StringBuilder builder = new StringBuilder();
+        String result = "2";
+        try{
+            URL url = new URL(str_url);
+            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+            connection.setRequestMethod("GET");
+            connection.setConnectTimeout(5000);
+            connection.setReadTimeout(8000);
+            connection.connect();
+            InputStream inputStream = connection.getInputStream();
+            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
+            while((result=reader.readLine())!=null){
+                builder.append(result);
+            }
+            connection.disconnect();
+        }catch (MalformedURLException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return builder.toString();
+    }
+}

CloudKey/app/src/main/res/layout/activity_main.xml

@@ -10,6 +10,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Hello World!"
+        android:id="@+id/text"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent"

开发历程.md

@@ -116,5 +116,10 @@ private String queryPassword(PrintWriter writer, Connection conn, String filemd5
 
 由于AndroidP之后默认的互联网协议是https,而不能用http,申请https需要域名,还要备案,挺麻烦的,所以需要在AndroidManifest文件中<application>标签下声明 android:usesCleartextTraffic="true" 才可使用http协议
 
+**2021/6/8**
 
+先测试网络功能,新建一个NetHandler类继承Handler类并重写handlerMessage()方法,然后新建一个NetThread类实现Runnable接口用于实现网络连接,然后在handlerMessage()中实现接受Web端的数据并Toast出来
 
+在这里,Web端print的是一个json型的字符串,所以Android端接受到这个字符串要进行解析,这里使用的是alibaba的fastjson库:implementation group: 'com.alibaba', name: 'fastjson', version: '1.2.75'
+
+经过测试,成功Toast出数据库中对应md5码的pwd