校園網自動登錄app

　　其實連接校園網不是個難題，就是傳輸一次post請求，之前也看到有大佬用python做到電腦上的自啟動腳本。不過由於這次想做的是app，而app最好還是用java寫，相比python會存在不少問題。

　　 https://www.cnblogs.com/chi4ki/p/16068429.html

一、python腳本

　　雖然要弄java，但還是借着之前看到的python腳本先理解一下思路。首先在校園網登錄的界面用F12觀察一下連接的時候post了哪些參數：

　　可以看到主要有兩個參數，DDDDD對應的是學號，形式是",0,學號和后綴"，后綴如果是@cmcc就是中國移動，如果是@njxy就是中國電信,如果無后綴則是校園網；而upass即是密碼。所以我們要手動實現一次登錄，只需要post這兩個參數就行，代碼如下:

import requests
url="http://10.10.244.11:801/eportal/c=ACSetting&a=Login&wlanacip=10.255.252.150"
data={"DDDDD": ",0,學號和后綴","upass": "密碼"}
response=requests.post(url,data)

　　可以說是簡單的不能再簡單……不過我們的目標肯定不是一次登錄，但是要是反復的post如果已經登錄則也不太合理，參考大佬的腳本，發現有這樣一個網址："http://p.njupt.edu.cn:801/eportal/?c=ACSetting&a=checkScanIP&wlanuserip="，ip后加上的是get"http://p.njupt.edu.cn/"得到的v46ip的值，就能查看到是否連接(ok/fail)，如果連接還能看到自己的學號和連接的后綴，所以我們設置每隔一段時間的循環，先用get檢查是否連接，未連接則post信息。代碼如下：

import requests
import requests
import re
import time
def getIp():
    url = "http://p.njupt.edu.cn/"
    res = requests.get(url = url)
    res.encoding = 'gbk'
    results = re.search("v46ip=\'([^\']*)\'", res.text)
    ip=results.group(1)
    return ip
def checkIp(ip):
    url = "http://p.njupt.edu.cn:801/eportal/?c=ACSetting&a=checkScanIP&wlanuserip={}".format(ip)
    res = requests.get(url = url)
    status = re.search('\"result\":\"([^\"]*)\"', res.text).group(1)
    if (status == 'ok'): 
        account = re.search('\"account\":\"([^\"]*)\"', res.text).group(1)
        return account
    else:
        return False
def login():
    url="http://10.10.244.11:801/eportal/?c=ACSetting&a=Login&wlanacip=10.255.252.150"
    data={"DDDDD": ",0,學號@cmcc","upass": "密碼"}  #修改學號和密碼
    response=requests.post(url,data)
    return True

while True:
    try:
        ip = getIp()
        if checkIp(ip) == False:
           login()
    except:
        pass
    time.sleep(5)

二、java腳本

　　可以說思路和python一樣，但是我們需要找到這幾個函數在java中的實現方法：requests.get、requests.post、re.search

1、re.search

　　用Pattern類來實現

private String re_search(String pa, String li) {
        String line = li;
        String pattern = pa;
        Pattern r = Pattern.compile(pattern);
        Matcher m = r.matcher(line);
        if (m.find()) {
            return m.group(1);
        } else {
            return "null";
        }
    }

2、get&post

　　網上有很多腳本，這里我用的是java自帶的HttpsURLConnection。

private final String USER_AGENT = "Mozilla/5.0";
private String sendGet(String Url) throws Exception {

        String url = Url;

        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();

        con.setRequestMethod("GET");

        con.setRequestProperty("User-Agent", USER_AGENT);

        int responseCode = con.getResponseCode();
        System.out.println("\nSending 'GET' request to URL : " + url);
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(
                new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        return response.toString();
    }

    private void sendPost(String Url) throws Exception {

        String url = Url;
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();

        con.setRequestMethod("POST");
        con.setRequestProperty("User-Agent", USER_AGENT);
        con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

        String urlParameters = "DDDDD=,0,學號@cmcc&upass=密碼"; // 修改學號密碼

        con.setDoOutput(true);
        DataOutputStream wr = new DataOutputStream(con.getOutputStream());
        wr.writeBytes(urlParameters);
        wr.flush();
        wr.close();

        int responseCode = con.getResponseCode();
        System.out.println("\nSending 'POST' request to URL : " + url);
        System.out.println("Post parameters : " + urlParameters);
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(
                new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
    }

3、完整代碼

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HttpURLConnectionExample {

    private final String USER_AGENT = "Mozilla/5.0";

    public static void main(String[] args) throws Exception {

        HttpURLConnectionExample http = new HttpURLConnectionExample();
        String ip, status, account = "";
        int count = 0;
        while (true) {
            try {
                Thread.sleep(5 * 1000);
                ip = http.re_search("v46ip=\'([^\']*)\'", http.sendGet("http://p.njupt.edu.cn/"));
                ip = "http://p.njupt.edu.cn:801/eportal/?c=ACSetting&a=checkScanIP&wlanuserip=" + ip;
                status = http.re_search("\"result\":\"([^\"]*)\"", http.sendGet(ip));
                if (status.equals("ok")) {
                    account = http.re_search("\"account\":\"([^\"]*)\"", http.sendGet(ip));
                } else {
                    http.sendPost("http://10.10.244.11:801/eportal/?c=ACSetting&a=Login&wlanacip=10.255.252.150");
                }
                count++;
                System.out.println(count);

            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private String re_search(String pa, String li) {
        String line = li;
        String pattern = pa;
        Pattern r = Pattern.compile(pattern);
        Matcher m = r.matcher(line);
        if (m.find()) {
            return m.group(1);
        } else {
            return "null";
        }
    }

    private String sendGet(String Url) throws Exception {

        String url = Url;

        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();

        con.setRequestMethod("GET");

        con.setRequestProperty("User-Agent", USER_AGENT);

        int responseCode = con.getResponseCode();
        System.out.println("\nSending 'GET' request to URL : " + url);
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(
                new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        return response.toString();
    }

    private void sendPost(String Url) throws Exception {

        String url = Url;
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();

        con.setRequestMethod("POST");
        con.setRequestProperty("User-Agent", USER_AGENT);
        con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

        String urlParameters = "DDDDD=,0,學號@cmcc&upass=密碼"; // 修改學號密碼

        con.setDoOutput(true);
        DataOutputStream wr = new DataOutputStream(con.getOutputStream());
        wr.writeBytes(urlParameters);
        wr.flush();
        wr.close();

        int responseCode = con.getResponseCode();
        System.out.println("\nSending 'POST' request to URL : " + url);
        System.out.println("Post parameters : " + urlParameters);
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(
                new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
    }
}

 

三、校園網自動登錄app

　　然而當我用java在電腦上寫好的時候才意識到get和post在windowst和android不太一樣……android相比windows還要解決以下幾個問題：

　　1、get&post

　　2、面向用戶時數據的讀取和存儲

　　3、下拉框（選擇移動電信還是校園網）

1、get&post

　　注意的是要首先加上發送網絡請求的權限,除此以外注意android studio要求網絡連接只能在子線程中進行。

　　網絡權限：在AndroidManifest.xml中添加

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<uses-permission android:name="android.permission.INTERNET" />

和android:usesCleartextTraffic="true"

　　位置如下:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.network">
    <!--第一處-->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
    <uses-permission android:name="android.permission.INTERNET" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Network"
        android:usesCleartextTraffic="true"> <!--第二處-->
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />


                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

　　get&post:

HttpURLConnection connection ;
    String line,pattern,param,results;
    int responseCode;
    //get的用法，用String獲取get的訪問值來滿足對ip和狀態的確定
    public String sendGet(String ip){
        try {
            connection = null;
            URL url = new URL(ip);
            connection = (HttpURLConnection) url.openConnection();
            connection.setConnectTimeout(3000);
            connection.setReadTimeout(3000);
            connection.setRequestMethod("GET");
            connection.setDoInput(true);
            connection.setDoOutput(false);
            connection.connect();
            responseCode = connection.getResponseCode();
            if (responseCode != HttpURLConnection.HTTP_OK) {
                throw new IOException("HTTP error code" + responseCode);
            }
            results = getStringByStream(connection.getInputStream());
            return results;
        }catch (IOException e) {
            e.printStackTrace();
            return "error";
        }
    }
    //post 因為這里用不到返回值所以void就行
    public void sendPost(String ip,String pa){
        try {
            connection = null;
            URL url = new URL(ip);
            connection = (HttpURLConnection) url.openConnection();
            connection.setConnectTimeout(3000);
            connection.setReadTimeout(3000);
            connection.setRequestMethod("POST");
            connection.setDoInput(true);
            connection.setDoOutput(false);
            connection.connect();
            DataOutputStream dos=new DataOutputStream(connection.getOutputStream());
            param=pa;
            dos.writeBytes(param);
            responseCode = connection.getResponseCode();
            if (responseCode != HttpURLConnection.HTTP_OK) {
                throw new IOException("HTTP error code" + responseCode);
            }
        }catch (IOException e) {
            e.printStackTrace();
        }
    }
    //用於返回值的處理
    private String getStringByStream(InputStream inputStream) {
        Reader reader;
        StringBuffer buffer;
        try {
            reader = new InputStreamReader(inputStream, "UTF-8");
            char[] rawBuffer = new char[512];
            buffer = new StringBuffer();
            int length;
            while ((length = reader.read(rawBuffer)) != -1) {
                buffer.append(rawBuffer, 0, length);
            }
            return buffer.toString();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

 

　　開啟一個子線程並調用：

new Thread(()->{
            //先做個連接，因為有時候這個ip還不是對應自己的
            sendPost(ip3,content);
            //做個計數
            int count=1;
            while(true)
            {
                try{
                    //每20秒進行一次的循環
                    Thread.sleep(20000);
                    text = sendGet(ip1);
                    ip = re_search("v46ip='([^']*)'", text);
                    ip2 += ip;
                    text = sendGet(ip2);
                    result = re_search("\"result\":\"([^\"]*)\"", text);
                    if (!result.equals("ok")) {
                        //不是ok的時候發起連接
                        Log.d("tag",content+String.valueOf(count));
                        count++;
                    }
                    else {
                        //已經連上時彈出消息框已經連接
                        runOnUiThread(() -> Toast.makeText(getApplicationContext(),
                                "connected", Toast.LENGTH_SHORT).show());
                        Log.d("tag",String.valueOf(count));
                        count++;
                    }
                }catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();

 

 

2、數據的永久性存儲

　　因為涉及需要存儲的信息很少，所以用SharedPreferences就行。

//獲取SharedPreferences對象
SharedPreferences.Editor editor = getSharedPreferences("lock", MODE_PRIVATE ).edit();
//添加數據
editor.putString("name", name);
editor.putString("code", code);
editor.apply();
//讀取數據
SharedPreferences read = getSharedPreferences("lock", MODE_PRIVATE );
read.getString("name", "");
read.getString("code", "");

3、下拉框

　　spinner的使用，由於只是選擇和讀取所以弄個監聽器就行。在values.xml里加入我們需要的選項，並在下拉框里加入android:entries="@array/choice"。

　　values.xml：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="choice">
        <item>中國移動</item>
        <item>中國電信</item>
        <item>校園網</item>
    </string-array>
</resources>

　　監聽函數：

//下拉框的監聽
    private class  ProvOnItemSelectedListener implements AdapterView.OnItemSelectedListener {
        @Override
        public void onItemSelected(AdapterView<?> adapter,View view,int position,long id) {
            String sInfo=adapter.getItemAtPosition(position).toString();
            if(sInfo.equals("中國移動")) p1.setType("@cmcc");
            if(sInfo.equals("中國電信")) p1.setType("@njxy");
            if(sInfo.equals("校園網")) p1.setType("校園網");
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            String sInfo="null";
        }
    }

 

4、完整代碼

Person.java

package com.example.network_2;

public class Person{
    String id;
    String password;
    String type;
    public Person(){
    }
    public void set(String i,String p,String t){
        id=i;
        password=p;
        type=t;
    }
    public void setType(String t){
        type=t;
    }
    public String getId(){
        return id;
    }
    public String getPassword(){
        return password;
    }
    public String getType(){
        return type;
    }
}

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/edt1"
        android:layout_width="261dp"
        android:layout_height="61dp"
        android:autofillHints="username"
        android:ems="10"
        android:hint="請輸入學號"
        android:inputType="textPersonName"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.44"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.134" />

    <EditText
        android:id="@+id/edt2"
        android:layout_width="261dp"
        android:layout_height="61dp"
        android:autofillHints="password"
        android:ems="10"
        android:hint="請輸入密碼"
        android:inputType="textPassword"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.433"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.225" />

    <Button
        android:id="@+id/btn1"
        android:layout_width="238dp"
        android:layout_height="107dp"
        android:text="自動連接校園網"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.514"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.62" />

    <Button
        android:id="@+id/btn2"
        android:layout_width="121dp"
        android:layout_height="66dp"
        android:text="修改"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.944"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.407" />

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="262dp"
        android:layout_height="48dp"
        android:entries="@array/choice"
        app:layout_constraintBottom_toTopOf="@+id/btn1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.436"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edt2"
        app:layout_constraintVertical_bias="0.0" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.example.network_2;

import androidx.appcompat.app.AppCompatActivity;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MainActivity extends AppCompatActivity {
    String ip,text,result,content,name,code;
    String ip1="http://p.njupt.edu.cn/";
    String ip2="http://p.njupt.edu.cn:801/eportal/?c=ACSetting&a=checkScanIP&wlanuserip=";
    String ip3= "http://10.10.244.11:801/eportal/?c=ACSetting&a=Login&wlanacip=10.255.252.150";
    Person person=new Person();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //給兩個按鈕設置監聽
        Button btn1=findViewById(R.id.btn1);
        btn1.setOnClickListener(new BtnClickListener());
        Button btn2=findViewById(R.id.btn2);
        btn2.setOnClickListener(new BtnClickListener());
        //給下拉框設置監聽
        Spinner spinner=findViewById(R.id.spinner);
        spinner.setOnItemSelectedListener(new ProvOnItemSelectedListener());
    }
    //按鈕的監聽
    class BtnClickListener implements View.OnClickListener {
        @Override
        public void onClick(View v){
            Integer id=v.getId();
            if(id.equals(R.id.btn2)) setUp();
            if(id.equals(R.id.btn1)) connect();
        }
    }
    //下拉框的監聽
    private class  ProvOnItemSelectedListener implements AdapterView.OnItemSelectedListener {
        @Override
        public void onItemSelected(AdapterView<?> adapter,View view,int position,long id) {
            String sInfo=adapter.getItemAtPosition(position).toString();
            if(sInfo.equals("中國移動")) person.setType("@cmcc");
            if(sInfo.equals("中國電信")) person.setType("@njxy");
            if(sInfo.equals("校園網")) person.setType("校園網");
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            String sInfo="null";
        }
    }
    //連接的步驟
    public void connect(){
        EditText txtName=findViewById(R.id.edt1);
        EditText txtCode=findViewById(R.id.edt2);
        //讀取存儲的內容
        SharedPreferences read = getSharedPreferences("lock", MODE_PRIVATE );
        name=read.getString("name", "");
        code=read.getString("code", "");
        person.set(name, code,read.getString("type",""));
        //將兩行輸入框設置為我們現在用的學號和密碼
        txtName.setText(name);
        txtCode.setText(code);
        //因為選擇校園網的時候后綴為空但這里不能直接設置為空，所以我們加個判斷來區分選擇校園網的時候
        if(person.getType().equals("校園網")) {
            content = "DDDDD=,0," + person.getId() + "&upass=" + person.getPassword();
        }else{
            content = "DDDDD=,0," + person.getId() + person.getType() + "&upass=" + person.getPassword();
        }
        //開啟子線程
        new Thread(()->{
            //先做個連接，因為有時候這個ip還不是對應自己的
            sendPost(ip3,content);
            //做個計數
            int count=1;
            while(true)
            {
                try{
                    //每20秒進行一次的循環
                    Thread.sleep(20000);
                    text = sendGet(ip1);
                    ip = re_search("v46ip='([^']*)'", text);
                    ip2 += ip;
                    text = sendGet(ip2);
                    result = re_search("\"result\":\"([^\"]*)\"", text);
                    if (!result.equals("ok")) {
                        //不是ok的時候發起連接
                        sendPost(ip3,content);
                        Log.d("tag",content+String.valueOf(count));
                        count++;
                    }
                    else {
                        //已經連上時彈出消息框已經連接
                        runOnUiThread(() -> Toast.makeText(getApplicationContext(),
                                "connected", Toast.LENGTH_SHORT).show());
                        Log.d("tag",String.valueOf(count));
                        count++;
                    }
                }catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
    //修改學號密碼
    public void setUp(){
        //讀取輸入框的值
        EditText txtName=findViewById(R.id.edt1);
        EditText txtCode=findViewById(R.id.edt2);
        name = txtName.getText().toString().trim();
        code = txtCode.getText().toString().trim();
        //永久性存儲數據
        SharedPreferences.Editor editor = getSharedPreferences("lock", MODE_PRIVATE ).edit();
        editor.putString("name", name);
        editor.putString("code", code);
        editor.putString("type", person.getType());
        editor.apply();
        //提示消息設置成功
        Toast.makeText(getApplicationContext(), "設置成功", Toast.LENGTH_SHORT).show();
    }
    //以下是Get、Post以及search函數
    HttpURLConnection connection ;
    String line,pattern,param,results;
    int responseCode;
    //get的用法，用String獲取get的訪問值來滿足對ip和狀態的確定
    public String sendGet(String ip){
        try {
            connection = null;
            URL url = new URL(ip);
            connection = (HttpURLConnection) url.openConnection();
            connection.setConnectTimeout(3000);
            connection.setReadTimeout(3000);
            connection.setRequestMethod("GET");
            connection.setDoInput(true);
            connection.setDoOutput(false);
            connection.connect();
            responseCode = connection.getResponseCode();
            if (responseCode != HttpURLConnection.HTTP_OK) {
                throw new IOException("HTTP error code" + responseCode);
            }
            results = getStringByStream(connection.getInputStream());
            return results;
        }catch (IOException e) {
            e.printStackTrace();
            return "error";
        }
    }
    //post 因為這里用不到返回值所以void就行
    public void sendPost(String ip,String pa){
        try {
            connection = null;
            URL url = new URL(ip);
            connection = (HttpURLConnection) url.openConnection();
            connection.setConnectTimeout(3000);
            connection.setReadTimeout(3000);
            connection.setRequestMethod("POST");
            connection.setDoInput(true);
            connection.setDoOutput(false);
            connection.connect();
            DataOutputStream dos=new DataOutputStream(connection.getOutputStream());
            param=pa;
            dos.writeBytes(param);
            responseCode = connection.getResponseCode();
            if (responseCode != HttpURLConnection.HTTP_OK) {
                throw new IOException("HTTP error code" + responseCode);
            }
        }catch (IOException e) {
            e.printStackTrace();
        }
    }
    //用於返回值的處理
    private String getStringByStream(InputStream inputStream) {
        Reader reader;
        StringBuffer buffer;
        try {
            reader = new InputStreamReader(inputStream, "UTF-8");
            char[] rawBuffer = new char[512];
            buffer = new StringBuffer();
            int length;
            while ((length = reader.read(rawBuffer)) != -1) {
                buffer.append(rawBuffer, 0, length);
            }
            return buffer.toString();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
    //模擬python中的re.search
    public String re_search(String pat, String li) {
        line = li;
        pattern = pat;
        Pattern r = Pattern.compile(pattern);
        Matcher m = r.matcher(line);
        if (m.find()) {
            return m.group(1);
        } else {
            return "null";
        }
    }
}

　　(比較好看的代碼顯示識別開啟線程的lambda表達式時會整個花掉，所以為了清楚一點就只能用這個了）

　　運行效果如下：

　　 

 

以上，不過也就只有在學校里能用，主要是寫一下思路。