#6 #7 #66 项目没有用到实验67，另外做了课上的实验

students/net1814080903106/report/lab6.md

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+# 实验六 Android网络编程
+
+## 一、实验目标
+
+
+
+1.掌握Android的网络访问方法；
+
+2.理解XML和JSON表示数据的方法。
+
+## 二、实验内容
+
+
+
+1.在个人目录中创建一个表示数据的XML或JSON文件；
+
+2.数据文件代码提交之后从GitHub获取文件URL；
+
+3.在应用中通过网络编程访问GitHub的数据文件；
+
+4.在应用中解析并显示文件所包含的数据；
+
+5.将应用运行结果截图。
+
+## 三、实验步骤
+
+1.建立activity_http_client.xml;
+
+activity_http_client.xml代码：
+
+ ```xml
+
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    tools:context="edu.hzuapps.androidlabs.examples.HttpClientActivity">
+
+    <Button
+        android:id="@+id/button_get_issues"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Get GitHub Issues"/>
+
+    <EditText
+        android:id="@+id/first_node_number"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</LinearLayout>
+ ```
+
+2.建立HttpClientActivity.java;
+
+HttpClientActivity.java代码：
+
+```java
+package edu.hzuapps.androidlabs.examples;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.ProtocolException;
+import java.net.URL;
+import java.net.URLDecoder;
+
+import edu.hzuapps.androidlabs.R;
+
+public class HttpClientActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_http_client);
+
+        ((Button) findViewById(R.id.button_get_issues)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Thread thread = new Thread(new Runnable() {
+                    @Override
+                    public void run() {
+                        String jsonText = getGitHubIssues();
+                        if (jsonText != null) {
+                            try {
+                                JSONArray jsonArr = new JSONArray(jsonText);
+                                JSONObject jsonObj = (JSONObject) jsonArr.get(1);
+                                int number = jsonObj.getInt("number");
+                                System.out.println("NUMBER = " + number);
+                                //((EditText) thisActivity.findViewById(R.id.first_node_number)).setText(Integer.toString(number));
+                            } catch (JSONException e) {
+                                e.printStackTrace();
+                            }
+                        }
+                    }
+                });
+                thread.start();
+            }
+        });
+    }
+
+    private String getGitHubIssues() {
+        String gitApi = "https://api.github.com/repos/hzuapps/android-labs-2020/issues";
+        //gitApi = "https://www.baidu.com";
+        URL url = null;
+        String jsonText = null;
+        try {
+            url = new URL(gitApi);
+            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+            // HttpClient
+            // OKHttp
+            //connection.setDoOutput(true);
+            //connection.setDoInput(true);
+            //connection.setRequestMethod("POST");
+            //connection.setUseCaches(false);
+            //connection.setInstanceFollowRedirects(true);
+            connection.setRequestProperty("Content-Type", "application/json");
+            connection.connect();
+            BufferedReader reader = new BufferedReader(new
+                    InputStreamReader(connection.getInputStream()));
+            String lines;
+            StringBuffer sb = new StringBuffer("");
+            while ((lines = reader.readLine()) != null) {
+                lines = URLDecoder.decode(lines, "utf-8");
+                sb.append(lines);
+            }
+            System.out.println(sb);
+            jsonText = sb.toString();
+            reader.close();
+            // 断开连接
+            connection.disconnect();
+        } catch (MalformedURLException e) {
+            e.printStackTrace();
+        } catch (ProtocolException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return jsonText;
+    }
+}
+```
+
+3.建立HttpClientUIActivity.java.
+
+HttpClientUIActivity.java代码：
+
+```java
+package edu.hzuapps.androidlabs.examples;
+
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.ProtocolException;
+import java.net.URL;
+import java.net.URLDecoder;
+
+import edu.hzuapps.androidlabs.R;
+
+public class HttpClientUIActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_http_client);
+
+        final HttpClientUIActivity thisActivity = this;
+
+        ((Button) findViewById(R.id.button_get_issues)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                runOnUiThread(new Runnable() {
+                    @Override
+                    public void run() {
+                        String jsonText = getGitHubIssues();
+                        if (jsonText != null) {
+                            try {
+                                JSONArray jsonArr = new JSONArray(jsonText);
+                                JSONObject jsonObj = (JSONObject) jsonArr.get(1);
+                                int number = jsonObj.getInt("number");
+                                System.out.println("NUMBER = " + number);
+                                ((EditText) thisActivity.findViewById(R.id.first_node_number)) //
+                                        .setText(Integer.toString(number));
+                            } catch (JSONException e) {
+                                e.printStackTrace();
+                            }
+                        }
+                    }
+                });
+            }
+        });
+    }
+
+    private String getGitHubIssues() {
+        String gitApi = "https://api.github.com/repos/hzuapps/android-labs-2020/issues";
+        //gitApi = "https://www.baidu.com";
+        URL url = null;
+        String jsonText = null;
+        try {
+            url = new URL(gitApi);
+            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+            // HttpClient
+            // OKHttp
+            //connection.setDoOutput(true);
+            //connection.setDoInput(true);
+            //connection.setRequestMethod("POST");
+            //connection.setUseCaches(false);
+            //connection.setInstanceFollowRedirects(true);
+            connection.setRequestProperty("Content-Type", "application/json");
+            connection.connect();
+            BufferedReader reader = new BufferedReader(new
+                    InputStreamReader(connection.getInputStream()));
+            String lines;
+            StringBuffer sb = new StringBuffer("");
+            while ((lines = reader.readLine()) != null) {
+                lines = URLDecoder.decode(lines, "utf-8");
+                sb.append(lines);
+            }
+            System.out.println(sb);
+            jsonText = sb.toString();
+            reader.close();
+            // 断开连接
+            connection.disconnect();
+        } catch (MalformedURLException e) {
+            e.printStackTrace();
+        } catch (ProtocolException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return jsonText;
+    }
+}
+```
+
+
+
+
+
+## 四、运行结果及截图
+
+
+
+![experiment6](experiment6.png)
+
+
+
+
+
+
+
+
+
+## 五、实验心得
+
+​		本次实验学习Android上的网络编程,自己的项目里没有用到网络编程的内容，所以本次实验尝试调试课上代码内容，通过本次实验的学习对Android网络访问方法有一定的了解，本次实验的难度还是很大，花了很多时间去读懂代码。
+