校园网自动登录app

　　其实连接校园网不是个难题，就是传输一次post请求，之前也看到有大佬用python做到电脑上的自启动脚本。不过由于这次想做的是app，而app最好还是用java写，相比python会存在不少问题。

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

一、python脚本

　　虽然要弄java，但还是借着之前看到的python脚本先理解一下思路。首先在校园网登录的界面用F12观察一下连接的时候post了哪些参数：

　　可以看到主要有两个参数，DDDDD对应的是学号，形式是",0,学号和后缀"，后缀如果是@cmcc就是中国移动，如果是@njxy就是中国电信,如果无后缀则是校园网；而upass即是密码。所以我们要手动实现一次登录，只需要post这两个参数就行，代码如下:

import requests
url="http://10.10.244.11:801/eportal/c=ACSetting&a=Login&wlanacip=10.255.252.150"
data={"DDDDD": ",0,学号和后缀","upass": "密码"}
response=requests.post(url,data)

　　可以说是简单的不能再简单……不过我们的目标肯定不是一次登录，但是要是反复的post如果已经登录则也不太合理，参考大佬的脚本，发现有这样一个网址："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，就能查看到是否连接(ok/fail)，如果连接还能看到自己的学号和连接的后缀，所以我们设置每隔一段时间的循环，先用get检查是否连接，未连接则post信息。代码如下：

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,学号@cmcc","upass": "密码"}  #修改学号和密码
    response=requests.post(url,data)
    return True

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

二、java脚本

　　可以说思路和python一样，但是我们需要找到这几个函数在java中的实现方法：requests.get、requests.post、re.search

1、re.search

　　用Pattern类来实现

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

　　网上有很多脚本，这里我用的是java自带的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,学号@cmcc&upass=密码"; // 修改学号密码

        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、完整代码

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,学号@cmcc&upass=密码"; // 修改学号密码

        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、校园网自动登录app

　　然而当我用java在电脑上写好的时候才意识到get和post在windowst和android不太一样……android相比windows还要解决以下几个问题：

　　1、get&post

　　2、面向用户时数据的读取和存储

　　3、下拉框（选择移动电信还是校园网）

1、get&post

　　注意的是要首先加上发送网络请求的权限,除此以外注意android studio要求网络连接只能在子线程中进行。

　　网络权限：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">
    <!--第一处-->
    <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"> <!--第二处-->
        <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获取get的访问值来满足对ip和状态的确定
    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 因为这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();
        }
    }
    //用于返回值的处理
    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;
    }

 

　　开启一个子线程并调用：

new Thread(()->{
            //先做个连接，因为有时候这个ip还不是对应自己的
            sendPost(ip3,content);
            //做个计数
            int count=1;
            while(true)
            {
                try{
                    //每20秒进行一次的循环
                    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的时候发起连接
                        Log.d("tag",content+String.valueOf(count));
                        count++;
                    }
                    else {
                        //已经连上时弹出消息框已经连接
                        runOnUiThread(() -> Toast.makeText(getApplicationContext(),
                                "connected", Toast.LENGTH_SHORT).show());
                        Log.d("tag",String.valueOf(count));
                        count++;
                    }
                }catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();

 

 

2、数据的永久性存储

　　因为涉及需要存储的信息很少，所以用SharedPreferences就行。

//获取SharedPreferences对象
SharedPreferences.Editor editor = getSharedPreferences("lock", MODE_PRIVATE ).edit();
//添加数据
editor.putString("name", name);
editor.putString("code", code);
editor.apply();
//读取数据
SharedPreferences read = getSharedPreferences("lock", MODE_PRIVATE );
read.getString("name", "");
read.getString("code", "");

3、下拉框

　　spinner的使用，由于只是选择和读取所以弄个监听器就行。在values.xml里加入我们需要的选项，并在下拉框里加入android:entries="@array/choice"。

　　values.xml：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="choice">
        <item>中国移动</item>
        <item>中国电信</item>
        <item>校园网</item>
    </string-array>
</resources>

　　监听函数：

//下拉框的监听
    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("中国移动")) p1.setType("@cmcc");
            if(sInfo.equals("中国电信")) p1.setType("@njxy");
            if(sInfo.equals("校园网")) p1.setType("校园网");
        }

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

 

4、完整代码

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="请输入学号"
        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="请输入密码"
        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="自动连接校园网"
        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);
        //给两个按钮设置监听
        Button btn1=findViewById(R.id.btn1);
        btn1.setOnClickListener(new BtnClickListener());
        Button btn2=findViewById(R.id.btn2);
        btn2.setOnClickListener(new BtnClickListener());
        //给下拉框设置监听
        Spinner spinner=findViewById(R.id.spinner);
        spinner.setOnItemSelectedListener(new ProvOnItemSelectedListener());
    }
    //按钮的监听
    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();
        }
    }
    //下拉框的监听
    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("中国移动")) person.setType("@cmcc");
            if(sInfo.equals("中国电信")) person.setType("@njxy");
            if(sInfo.equals("校园网")) person.setType("校园网");
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            String sInfo="null";
        }
    }
    //连接的步骤
    public void connect(){
        EditText txtName=findViewById(R.id.edt1);
        EditText txtCode=findViewById(R.id.edt2);
        //读取存储的内容
        SharedPreferences read = getSharedPreferences("lock", MODE_PRIVATE );
        name=read.getString("name", "");
        code=read.getString("code", "");
        person.set(name, code,read.getString("type",""));
        //将两行输入框设置为我们现在用的学号和密码
        txtName.setText(name);
        txtCode.setText(code);
        //因为选择校园网的时候后缀为空但这里不能直接设置为空，所以我们加个判断来区分选择校园网的时候
        if(person.getType().equals("校园网")) {
            content = "DDDDD=,0," + person.getId() + "&upass=" + person.getPassword();
        }else{
            content = "DDDDD=,0," + person.getId() + person.getType() + "&upass=" + person.getPassword();
        }
        //开启子线程
        new Thread(()->{
            //先做个连接，因为有时候这个ip还不是对应自己的
            sendPost(ip3,content);
            //做个计数
            int count=1;
            while(true)
            {
                try{
                    //每20秒进行一次的循环
                    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的时候发起连接
                        sendPost(ip3,content);
                        Log.d("tag",content+String.valueOf(count));
                        count++;
                    }
                    else {
                        //已经连上时弹出消息框已经连接
                        runOnUiThread(() -> Toast.makeText(getApplicationContext(),
                                "connected", Toast.LENGTH_SHORT).show());
                        Log.d("tag",String.valueOf(count));
                        count++;
                    }
                }catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
    //修改学号密码
    public void setUp(){
        //读取输入框的值
        EditText txtName=findViewById(R.id.edt1);
        EditText txtCode=findViewById(R.id.edt2);
        name = txtName.getText().toString().trim();
        code = txtCode.getText().toString().trim();
        //永久性存储数据
        SharedPreferences.Editor editor = getSharedPreferences("lock", MODE_PRIVATE ).edit();
        editor.putString("name", name);
        editor.putString("code", code);
        editor.putString("type", person.getType());
        editor.apply();
        //提示消息设置成功
        Toast.makeText(getApplicationContext(), "设置成功", Toast.LENGTH_SHORT).show();
    }
    //以下是Get、Post以及search函数
    HttpURLConnection connection ;
    String line,pattern,param,results;
    int responseCode;
    //get的用法，用String获取get的访问值来满足对ip和状态的确定
    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 因为这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();
        }
    }
    //用于返回值的处理
    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;
    }
    //模拟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";
        }
    }
}

　　(比较好看的代码显示识别开启线程的lambda表达式时会整个花掉，所以为了清楚一点就只能用这个了）

　　运行效果如下：

　　 

 

以上，不过也就只有在学校里能用，主要是写一下思路。