Android中使用网络和服务器端程序进行数据交换

叁歲伎倆 2022-09-22 14:53 120阅读 0赞

通过Get和Post方式从服务器读取数据和发送数据

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*  XML文件：

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="top.helloworldes.getpost.MainActivity">
    
        <Button android:id="@+id/get" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="get" />
    
        <Button android:id="@+id/post" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="post" />
    
        <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/username" android:layout_gravity="center_horizontal" android:text="admin" />
    
        <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/password" android:layout_gravity="center_horizontal" android:text="admin" />
    
        <ScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/scrollView" android:layout_gravity="center_horizontal">
            <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="HelloWood" android:id="@+id/textView" />
        </ScrollView>
    </LinearLayout>

*  MainActivity

public class MainActivity extends AppCompatActivity { 
    
        Button get, post;
        TextView show;
        String response;
        EditText name,pswd;
        String username,password,params;
    
        Handler handler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                if (msg.what == 0x123) {
                    show.setText(response);
                }
                if (msg.what == 0x124) {
                    System.out.println(params);
                }
            }
        };
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            get = (Button) findViewById(R.id.get);
            post = (Button) findViewById(R.id.post);
            show = (TextView) findViewById(R.id.textView);
            name = (EditText) findViewById(R.id.username);
            pswd = (EditText) findViewById(R.id.password);
    
            get.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    new Thread() {
                        @Override
                        public void run() {
                            response = GetPostUtil.sendGet("http://www.helloworlds.top/Test/index.jsp", null);
                            handler.sendEmptyMessage(0x123);
                        }
                    }.start();
                }
            });
    
            post.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v)
                {
                    handler.sendEmptyMessage(0x124);
                    postMsg();
                }
            });
        }
    
        public void postMsg() {
            new Thread() {
                @Override
                public void run() {
                    username = name.getText().toString();
                    password = pswd.getText().toString();
    
                    params = "username=" + username + "&" + "password=" + password;
                    response = GetPostUtil.sendPost("http://www.helloworlds.top/Test/login.jsp",params);
                    handler.sendEmptyMessage(0x123);
                }
            }.start();
        }
    }

*  GetPostUtil

public class GetPostUtil {
        public static String sendGet(String url, String params) {
            String result = "";
            BufferedReader in = null;
            String urlName = url + "?" + params;
            try {
                URL realUrl = new URL(urlName);
                URLConnection conn = realUrl.openConnection();
                conn.connect();
                in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                String line;
                while ((line = in.readLine()) != null) {
                    result += "\n" + line;
                }
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (in != null) {
                        in.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return result;
        }
    
    
        public static String sendPost(String url, String params) {
            PrintWriter out = null;
            BufferedReader in = null;
            String result = "";
            try {
                URL realUrl = new URL(url);
                URLConnection conn = realUrl.openConnection();
                conn.setDoOutput(true);
                conn.setDoInput(true);
                out = new PrintWriter(conn.getOutputStream());
                out.print(params);
                out.flush();
                in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                String line;
                while ((line = in.readLine()) != null) {
                    result += "\n" + line;
                    Log.i("GetPost", line);
                }
            } catch (MalformedURLException e) {
                Log.e("GetPost:", "Post请求异常");
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (out != null) {
                        out.close();
                    }
                    if (in != null) {
                        in.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return result;
        }
    }