詳解Android的登錄那點(diǎn)事

更新時(shí)間：2016年12月20日 11:47:36 作者：小破孩123

本篇為大家介紹的內(nèi)容包括：1、用戶連續(xù)多次輸錯(cuò)密碼，增加驗(yàn)證碼驗(yàn)證；2、Android如何通過http請(qǐng)求達(dá)到與服務(wù)器之間的通訊。內(nèi)容簡(jiǎn)單，便于學(xué)習(xí)。

隨著互聯(lián)網(wǎng)的高速發(fā)展，一個(gè)應(yīng)用為了保護(hù)用戶的隱私，通常會(huì)通過設(shè)置用戶名+密碼的驗(yàn)證方式保證用戶隱私的相對(duì)安全，我知道一般網(wǎng)站的登錄驗(yàn)證，通常會(huì)設(shè)置一個(gè)二維碼，通過驗(yàn)證二維碼，防止惡意軟件通過機(jī)械程序，對(duì)用戶密碼進(jìn)行破解，那么Android設(shè)備如何實(shí)現(xiàn)這個(gè)功能呢？相信很多開發(fā)者對(duì)此不屑一顧，因?yàn)檫@樣增加了用戶使用的復(fù)雜性，很多軟件是不會(huì)這樣設(shè)計(jì)的，現(xiàn)在我們暫且不談它是不是有用，今天我們重點(diǎn)探討一下，如何在Android的設(shè)備上實(shí)現(xiàn)這個(gè)功能。本篇為大家介紹的內(nèi)容包括：1、用戶連續(xù)多次輸錯(cuò)密碼，增加驗(yàn)證碼驗(yàn)證；2、Android如何通過http請(qǐng)求達(dá)到與服務(wù)器之間的通訊。好了下面開始我們今天內(nèi)容的介紹，首先我們先一起來學(xué)習(xí)一下如何實(shí)現(xiàn)用戶連續(xù)多次輸錯(cuò)密碼，增加驗(yàn)證碼功能。

既然用的到二維碼，那么Android如何生成二維碼呢？為大家提供一個(gè)生成二維碼的類：

//生成二維碼的類
public class BPUtil {
 /**
  * 用于生成二維碼的字符
  */
 private static final char[] CHARS = {
  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
  'a','b','c','d','e','f','g','h','i','j','k','m','l','n','o','p','q','r','s','t','u','v','w','x','y','z',
  'A','B','C','D','E','F','G','H','I','J','K','M','L','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
 };
 private static BPUtil bpUtil;
 public static BPUtil getInstance() {
  if(bpUtil == null)
   bpUtil = new BPUtil();
  return bpUtil;
 }
//   width="60" height="30" 
//    base_padding_left="5"
//   range_padding_left="10"
//   base_padding_top="15"
//   range_padding_top="10"
//   codeLength="4"
//   line_number="3"
//   font_size="20"
 //default settings
 private static final int DEFAULT_CODE_LENGTH = 4;
 private static final int DEFAULT_FONT_SIZE = 20;
 private static final int DEFAULT_LINE_NUMBER = 3;
 private static final int BASE_PADDING_LEFT = 5, RANGE_PADDING_LEFT = 10, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 10;
 private static final int DEFAULT_WIDTH = 60, DEFAULT_HEIGHT = 30;
 //settings decided by the layout xml
 //canvas width and height
 private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT; 
 //random word space and pading_top
 private int base_padding_left = BASE_PADDING_LEFT, range_padding_left = RANGE_PADDING_LEFT, 
   base_padding_top = BASE_PADDING_TOP, range_padding_top = RANGE_PADDING_TOP;
 //number of chars, lines; font size
 private int codeLength = DEFAULT_CODE_LENGTH, line_number = DEFAULT_LINE_NUMBER, font_size = DEFAULT_FONT_SIZE;
 //variables
 private String code;
 private int padding_left, padding_top;
 private Random random = new Random();
 public Bitmap createBitmap() {
  padding_left = 0;
  Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888); 
  Canvas c = new Canvas(bp);
  code = createCode();
  c.drawColor(Color.WHITE);
  Paint paint = new Paint();
  paint.setTextSize(font_size);
  for (int i = 0; i < code.length(); i++) {
   randomTextStyle(paint);
   randomPadding();
   c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);
  }
  for (int i = 0; i < line_number; i++) {
   drawLine(c, paint);
  }
  c.save( Canvas.ALL_SAVE_FLAG );//保存 
  c.restore();//
  return bp;
 }
 public String getCode() {
   return bpUtil.createCode();
 }
 private String createCode() {
  StringBuilder buffer = new StringBuilder();
  for (int i = 0; i < codeLength; i++) {
   buffer.append(CHARS[random.nextInt(CHARS.length)]);
  }
  return buffer.toString();
 }
 private void drawLine(Canvas canvas, Paint paint) {
  int color = randomColor();
  int startX = random.nextInt(width);
  int startY = random.nextInt(height);
  int stopX = random.nextInt(width);
  int stopY = random.nextInt(height);
  paint.setStrokeWidth(1);
  paint.setColor(color);
  canvas.drawLine(startX, startY, stopX, stopY, paint);
 }
 private int randomColor() {
  return randomColor(1);
 }
 private int randomColor(int rate) {
  int red = random.nextInt(256) / rate;
  int green = random.nextInt(256) / rate;
  int blue = random.nextInt(256) / rate;
  return Color.rgb(red, green, blue);
 }
 private void randomTextStyle(Paint paint) {
  int color = randomColor();
  paint.setColor(color);
  paint.setFakeBoldText(random.nextBoolean()); //true為粗體，false為非粗體
  float skewX = random.nextInt(11) / 10;
  skewX = random.nextBoolean() ? skewX : -skewX;
  paint.setTextSkewX(skewX); //float類型參數(shù)，負(fù)數(shù)表示右斜，整數(shù)左斜
//  paint.setUnderlineText(true); //true為下劃線，false為非下劃
//  paint.setStrikeThruText(true); //true為刪除線，false為非刪除
 }
 private void randomPadding() {
  padding_left += base_padding_left + random.nextInt(range_padding_left);
  padding_top = base_padding_top + random.nextInt(range_padding_top);
 }
}

有了二維碼，下面我們開始設(shè)計(jì)我們的功能，這里先簡(jiǎn)單說一下，我們最終要實(shí)現(xiàn)的功能：1、用戶正常輸入用戶名+密碼登錄；2、當(dāng)用戶連續(xù)3次輸錯(cuò)密碼，要求用戶之后必須增加驗(yàn)證碼輸入驗(yàn)證。下面我們開始功能設(shè)計(jì)實(shí)現(xiàn)，首先是我們的布局文件：

<RelativeLayout 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"
 tools:context="${relativePackage}.${activityClass}" 
 android:orientation="vertical"
 >
 <LinearLayout 
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical"
  >
 <TextView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal"
  android:text="@string/yanzheng" />
 <LinearLayout 
  android:orientation="horizontal"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content" 
  >
   <TextView
   android:layout_weight="1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="@string/name" />
   <EditText 
    android:id="@+id/name"
    android:layout_width="wrap_content"
    android:layout_weight="6"
    android:layout_height="wrap_content"
    android:hint="@string/name_new"
    android:singleLine="true"
    />
  </LinearLayout>
  <LinearLayout 
  android:orientation="horizontal"
   android:layout_width="fill_parent"
  android:layout_height="wrap_content" 
  >
   <TextView
   android:layout_weight="1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="@string/password" />
   <EditText 
    android:id="@+id/pass"
    android:layout_weight="6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:hint="@string/pass_new"
    android:singleLine="true"
    />
  </LinearLayout>
  <LinearLayout 
  android:id="@+id/layout_yanzhengma"
  android:visibility="gone"
  android:orientation="horizontal"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content" 
  >
   <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="@string/yanzhengma" />
   <TextView
    android:id="@+id/rander"
   android:layout_weight="1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   />
   <EditText
    android:id="@+id/rander_input"
    android:layout_weight="1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:singleLine="true"
    />
  </LinearLayout>
  <LinearLayout 
  android:orientation="horizontal"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content" 
  >
   <Button
   android:id="@+id/get"
   android:layout_weight="1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="@string/get" />
   <Button
   　　android:id="@+id/post"
   android:layout_weight="1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="@string/post" />
  </LinearLayout>
  </LinearLayout>
</RelativeLayout>

重點(diǎn)的內(nèi)容來了，我們主Activity代碼，大家先看一下吧：

public class MainActivity extends Activity {
 private TextView mytext = null;
 private EditText myname = null;//用戶名
 private EditText mypass = null;//密碼
 private EditText myrander = null;//驗(yàn)證碼
 private Button mygetbutton = null;//Get方式發(fā)送Http請(qǐng)求
 private Button mypostbutton = null;//Post方式發(fā)送Http請(qǐng)求
 private LinearLayout myline = null;//控制二維碼的顯示
 private static int n = 0;//用戶輸錯(cuò)密碼次數(shù)統(tǒng)計(jì)
 static String name = null;//用戶輸入的用戶名
 static String password = null;//用戶輸入的密碼
 private String edit;//用戶輸入用戶輸入的驗(yàn)證碼
 private String code;//驗(yàn)證碼
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  mytext = (TextView)findViewById(R.id.rander);
  myname = (EditText)findViewById(R.id.name);
  mypass = (EditText)findViewById(R.id.pass);
  myrander = (EditText)findViewById(R.id.rander_input);
  mygetbutton = (Button)findViewById(R.id.get);
  mypostbutton = (Button)findViewById(R.id.post);
  myline = (LinearLayout)findViewById(R.id.layout_yanzhengma);
  mygetbutton.setOnClickListener(new mygetbutton());
  mypostbutton.setOnClickListener(new mypostbutton());

 } 
 class mygetbutton implements OnClickListener{
  public void onClick(View v) {
   name = myname.getText().toString();
   password = mypass.getText().toString();
   if(n>=3){//連續(xù)三次輸錯(cuò)密碼
    edit = myrander.getText().toString();
    boolean boo = captcha (code , edit);
    if(boo){
     new Thread(new Runnable() {
      public void run() {
       final boolean flag = SendServer.getsave(name, password);
       runOnUiThread(new Runnable() {
        public void run() {
         if(flag){
  Toast.makeText(MainActivity.this, "登錄成功", Toast.LENGTH_SHORT).show();
          n=0;
         }else{
 Toast.makeText(MainActivity.this, "登錄失敗", Toast.LENGTH_SHORT).show();
          n++;
          if(n>=3){
  myline.setVisibility(View.VISIBLE);
          }
         }
        }
       });
      }
     }).start();
    }else{
     code = BPUtil.getInstance().getCode().toLowerCase();//生成新的二維碼
     mytext.setText(code);//展示在用戶面前
    }
   }else{
    new Thread(new Runnable() {
     public void run() {
      final boolean flag = SendServer.getsave(name, password);
      runOnUiThread(new Runnable() {
       public void run() {
        if(flag){
         Toast.makeText(MainActivity.this, "登錄成功", Toast.LENGTH_SHORT).show();
         n=0;
        }else{
         Toast.makeText(MainActivity.this, "登錄失敗", Toast.LENGTH_SHORT).show();
         n++;
         if(n>=3){
 myline.setVisibility(1);
          code = BPUtil.getInstance().getCode().toLowerCase();
     mytext.setText(code);
         }
        }
       }
      });
     }
    }).start();
   }
  }
 }
 class mypostbutton implements OnClickListener{
  public void onClick(View v) {
   name = myname.getText().toString();
   password = mypass.getText().toString();
   new Thread(new Runnable() {
    public void run() {
     final boolean flag = SendServer.postsave(name, password);
     runOnUiThread(new Runnable() {
      @Override
      public void run() {
       if(flag){
        Toast.makeText(MainActivity.this, "登錄成功", Toast.LENGTH_SHORT).show();
        n=0;
       }else{
        Toast.makeText(MainActivity.this, "登錄失敗", Toast.LENGTH_SHORT).show();
        n++;
        if(n>=3){
    myline.setVisibility(1);
        }
       }
      }
     });
    }
   }).start();
  }
 }
 @SuppressLint("ShowToast")
 private boolean captcha (String code , String edit) {
  boolean flag = false; 
  if (code.equals(edit)) {
   flag = true;
  }else {
   flag = false;
   Toast.makeText(MainActivity.this, " 驗(yàn)證碼錯(cuò)誤", 0).show();
//   imageview.setImageBitmap(bitmap);
  }
  return flag;
 }
 protected void onRestart() {
  super.onRestart();
  n=0;
 }
 protected void onDestroy() {
  super.onDestroy();
  n=0;
 }
}

在這里簡(jiǎn)單介紹一下代碼，因?yàn)楸酒酉聛硪獮榇蠹曳窒黻P(guān)于Android發(fā)送GET、POST請(qǐng)求的知識(shí)，這里我寫了兩個(gè)按鈕，一個(gè)用來通過使用GET方式驗(yàn)證，一個(gè)通過使用POST方式驗(yàn)證，功能上是一致的。最后請(qǐng)大家注意一下：紅色字體部分，紅色字體部分就是我們通過調(diào)用上部二維碼生成類，生成二維碼，然后展示在用戶界面。還有就是：onRestart、onDestroy都是Activity的生命周期函數(shù)，這里將n歸零，方便我們的再次登錄體驗(yàn)。好了到這里我們的第一部分就完成了，下面我們開始進(jìn)入我們本篇的下半部分。

關(guān)于Android服務(wù)器請(qǐng)求，一般有兩種方式：GET、POST兩種方式，接下來我們就開始一起學(xué)習(xí)吧。

public class SendServer {
 //GET方式請(qǐng)求
 public static boolean getsave(String name, String password) {
  boolean flag = false;
  HttpURLConnection conn = null;
  try {
   //防止中文亂碼
   String username = URLEncoder.encode(name, "UTF-8");
   String userpassword = URLEncoder.encode(password, "UTF-8");
   URL url = new URL("http://10.20.90.3:8080/Register/ManageServlet?"+"name="+username+"&password="+userpassword);
   conn = (HttpURLConnection) url.openConnection();
   conn.setRequestMethod("GET");
   conn.setConnectTimeout(5000);
   conn.setReadTimeout(5000);
   int responseCode = conn.getResponseCode();
   if(responseCode == 200){
    InputStream is = conn.getInputStream();
    String stu = getStringFromInputStream(is);
    if(stu.equals("登錄成功")){
     flag = true;
    }
   }
  } catch (MalformedURLException e) {
   e.printStackTrace();
  } catch (Exception e) {
   e.printStackTrace();
  } finally{
   if(conn != null){
    conn.disconnect(); //關(guān)閉連接
   }
  }
  return flag;
 }
 //POST請(qǐng)求
 public static boolean postsave(String name, String password) {
  boolean flag = false;
  HttpURLConnection conn = null;
  try {
   URL url = new URL("http://10.20.90.3:8080/Register/ManageServlet?");
   conn = (HttpURLConnection) url.openConnection();
   conn.setRequestMethod("POST");
   conn.setConnectTimeout(5000);
   conn.setReadTimeout(5000);
   //post請(qǐng)求參數(shù)
   String data = "name="+name+"&password="+password;
   OutputStream out = conn.getOutputStream();
   out.write(data.getBytes());
   out.flush();
   out.close();
//   conn.setRequestProperty("Content-Length", 500);// 內(nèi)容長(zhǎng)度設(shè)置為500；請(qǐng)求頭消息格式設(shè)置
   int respon = conn.getResponseCode();
   if(respon == 200){
    InputStream is = conn.getInputStream();
    String stu = getStringFromInputStream(is);
    if(stu.equals("登錄成功")){
     flag = true;
    }
   }
  } catch (Exception e) {
   e.printStackTrace();
  }finally{
   if(conn != null){
    conn.disconnect();
   }
  }
  return flag;
 }
 //解析服務(wù)返回的請(qǐng)求
 private static String getStringFromInputStream(InputStream is) throws Exception{
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  byte[] buffer = new byte[1024*8];
  int len = -1;
  while((len = is.read(buffer)) != -1){
   baos.write(buffer, 0, len);
  }
  is.close();
  String html = new String(baos.toByteArray(), "GBK");//接收服務(wù)器端的數(shù)據(jù)時(shí)，防止出現(xiàn)中文亂碼。

  //String html = baos.toString();
  baos.close();
  return html;
 }
}

好了結(jié)束了，內(nèi)容簡(jiǎn)單，大家自行了解吧。新手學(xué)習(xí)，高手交流。

以上就是本文的全部?jī)?nèi)容，希望本文的內(nèi)容對(duì)大家的學(xué)習(xí)或者工作能帶來一定的幫助，同時(shí)也希望多多支持腳本之家！

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