Quick APK Hack Tutorial

# extract apk to <target-name> folder
apktool.bat d <target-name>.apk
# extract classes.dex and convert dex to jar
d2j-dex2jar classes.dex
# convert jar class files to java
jd-gui.exe classes-dex2jar.jar
# analyze and hack smali files based on java files
edit <critical *.smali files in <target-name> folder>
# build apk (output apk located in <target-name>/dist folder)
apktool.bat b <target-name>
# open easy tool to sign hacked apk
"APK Easy Tool.exe"
# "select" <target-name>/dist/<target-name>.apk
# click on "sign selected APK"

Javascript一次性查看所有漫画图片：http://18h.mm-cg.com

在http://18h.mm-cg.com（18H,18h漫！在線H成人漫畫,18H千本H中漫與您分享）网站上一次性load所有图片：

在Firefox地址栏里键入”about:config”
把”noscript.allowURLBarJS”修改为true
打开漫画网页
在Firefox地址栏里键入”javascript:jpg_star=1; jpg_end=Large_cgurl.length+1;show_print();”

Java 7 & Java 8 changes

Java 7

Binary Literals:

```
int[] array = { 0b1111, 0b0000 };
```

Type Inference:

Map<String, String> map = new HashMap<>();

Underscores:

double pi = 3.14159_26535;
long lightyear = 9_460_730_472_580_800;
long header = 0xCAFE_BABE;

String switch:

switch(str) {
  case "key1": return 1;
  case "key2": return 2;
  default: throw new NotFoundException();
}

try-with-resources:

try (FileReader fr = new FileReader(fileName); BufferedReader br = new BufferedReader(fr);) {
  br.readLine();
}

Catching multiple exception types:

try {
  method.invoke(object, new Object[] {});
} catch (IllegalArgumentException | NullPointerException ex) {
  logger.warn("Failed!", ex);
}

Rethrowing Exceptions with type checking:

void method() throws Exception1, Exception2 {
  try {
    if (error1) throw new Exception1();
    if (error2) throw new Exception2();
  } catch (Exception e) {
    throw e;
  }
}

Java 8

Lambdas (Closures):

Arrays.asList("a", "b", "c").forEach( e -> System.out.println( e ) );

Arrays.asList("a", "b", "c").forEach( (String e) -> {
  System.out.println( e );
  System.out.println( e );
} );

Arrays.asList("a", "b", "c").sort( ( e1, e2) -> e1.compareTo( e2 ) );

Arrays.asList("a", "b", "c").sort( ( e1, e2) -> {
  int result = e1.compareTo( e2 );
  return result;
} );

Functional Interfaces:

@FunctionalInterface
public interface Function1 {
  void method();
}

Default methods in interfaces:

public interface Defaultable {
  default String notRequired() {
    return "default implementation";
  }
}

Static methods in interfaces:

public interface DefaultableFactory {
  // declares and provides implementation of static methods
  static Defaulable create( Supplier< Defaulable > supplier) {
    return supplier.get();
  }
}

public static void main(String... args) {
  Defaulable obj = DefaulableFactory.create( DefaultableImpl::new );
}

Method References:

public static class Car {
  // constructor reference with the syntax Class::new or Class< T > ::new
  public static Car create( final Supplier< Car > supplier ) {
    return supplier.get();
  }
  
  // reference to static method with the syntax Class::static_method
  public static void collide( final Car car ) { ... }

  // reference to instance method of arbitrary object of specific type with the syntax Class::method
  public static void repair( ) { ... }

  // reference to instance method of particular class instance with the syntax instance::method
  public void follow( final Car another ) { ... }
}

public static void main(String... args) {
  final Car car = Car.create( Car::new );
  final List< Car > cars = Arrays.asList( car);

  cars.forEach( Car::collide );

  cars.forEach( Car::repair );

  final Car police = Car.create( Car::new );
  cars.forEach( police::follow );  
}

Repeating annotations:

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface Filters {
  Filter[] value();
}

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(Filters.class)
public @interface Filter {
  String value();
}

@Filter("filter1")
@Filter("filter2")
public interface Filterable {
}

public static void main(String... args) {
  for( Filter filter: Filterable.class.getAnnotationsByType( Filter.class )) {
    System.out.println( filter.value() );
  }
}

Better Type Inference:

public class Value< T > {
  public static< T > T defaultValue() { return null; }
  public T getOrDefault( T value, T defaultValue ) { return ...; }
}

public static void main(String... args) {
  final Value< String > value = new Value<>();
  value.getOrDefault("2", Value.defaultValue() );
}

Extended Annotations Support:

```
local variables
```
```
generic types
```
```
super-classes
```
```
implementing interfaces
```
```
exception declarations
```

Optional:

Optional<String> name = Optional.ofNullable( null );

```
name.isPresent(); // false
```
```
name.orElseGet( () > "none" )); // none
```

name.map( s > "Hi "+s).orElse("Hi!")); // Hi!

Stream API:

final Collection< Task > tasks = Arrays.asList( new Task(Tastus.OPEN, 5), ... );

final long totalPointsOfOpenTasks = tasks.stream()
  // filters out all NON-OPEN tasks
  .filter( task > task.getStatus() == Status.OPEN )
  // converts the stream to the stream of Integers
  .mapToInt( Task:.getPoints )
  .sum();

final double totalPoints = tasks.stream()
  // process all tasks in parallel
  .parallel()
  // converts the stream to the stream of Integers
  .map( task > task.getPoints() )
  // calculate the final result using reduce method
  .reduce( 0, Integer::sum );

final Map<Status, List<Task>> map = tasks.stream()
  // group tasks by their status
  .collect( Collectors.groupingBy( Task::getStatus());

final Path path = new File(filename).toPath();
try (Stream< String> lines = Files.lines( path, StandardCharsets.UTF_8 )) {
  lines.onClose( () > System.out.println("Done!")).forEatch(System.out.println);
}

Date/Time API:

```
Clock clock = Clock.systemUTC();
```
```
LocalDate date = LocalDate.now();
```
```
LocalTime time = LocalTime.now();
```

LocalDateTime datetime = LocalDateTime.now();

ZonedDateTime zonedDatetime = ZonedDateTime.now( ZoneId.of("America/Los_Angeles") );

Duration duration = Duration.between( from, to);

Nashorn JavaScript engine:

(new ScriptEngineManager()).getEngineByName("JavaScript").eval("function f() { return 1; }; f() + 1;"); // result: 2

command line: “jjs func.js”

Base64:

String encoded = Base64.getEncoder().encodeToString( str.getBytes( StandardCharsets.UTF_8 ));

String decoded = new String( Base64.getDecoder().decode( encoded), StandardCharsets.UTF_8 )

```
// Base64.getMimeEncoder()
```
```
// Base64.getMimeDecoder()
```
```
// Base64.getUrlEncoder()
```
```
// Base64.getUrlDecoder()
```

Parallel Arrays:

Arrays.parallelSetAll( array, index > ThreadLocalRandom.current().nextInt( 100000) );

```
Arrays.parallelSort( array );
```

Arrays.stream( array ).limit( 10).forEach( i > System.out.print(i + " "));

JVM Metaspace:

// replaces PermGen
-XX:MetaSpaceSize -XX:MaxMetaspaceSize

ldapsearch的应用

在其他人公开的LDAP-属性里查找感兴趣的内容：

ldapsearch -x -LLL -W -D -b “DC=X,DC=Y,DC=com” “(sAMAccountName=)” cn l telephoneNumber mail

Create thumbnails using PDFRenderer and ImgScalr


  public static boolean createThumbnail(File inputFile, File targetFile)

  {

    try

    {

      BufferedImage img = null;

      if (inputFile != null && targetFile != null && inputFile.getName().toLowerCase().endsWith(".pdf"))

      {

        img = convertPdfToImage(inputFile);

      } else

      {

        img = ImageIO.read(inputFile);

      }

      BufferedImage thumbImg = createThumbnail(img);

      ImageIO.write(thumbImg, "png", targetFile);

      return true;

    } catch (Exception e)

    {
    }

    return false;

  }
  private static BufferedImage createThumbnail(BufferedImage img)

  {

    BufferedImage result = null;

    if (img.getWidth() < img.getHeight())

    {

      result = resize(img, Method.QUALITY, Mode.FIT_TO_HEIGHT, 128, OP_ANTIALIAS);

    } else

    {

      result = resize(img, Method.QUALITY, Mode.FIT_TO_WIDTH, 128, OP_ANTIALIAS);

    }

    return result;

  }
  private static BufferedImage convertPdfToImage(File pdfFile) throws IOException

  {

    RandomAccessFile raf = null;

    FileChannel channel = null;

    try

    {

      raf = new RandomAccessFile(pdfFile, "r");

      channel = raf.getChannel();

      ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());

      PDFFile pdffile = new PDFFile(buf);

      PDFPage page = pdffile.getPage(0);
      Rectangle rect = new Rectangle(0, 0, (int) page.getBBox().getWidth(), (int) page.getBBox().getHeight());

      Image image = page.getImage(rect.width, rect.height, rect, null, true, true);

      BufferedImage img = new BufferedImage(rect.width, rect.height, BufferedImage.TYPE_INT_RGB);

      Graphics2D bufImageGraphics = img.createGraphics();

      bufImageGraphics.drawImage(image, 0, 0, null);

      return img;

    } finally

    {

      if (channel != null)

      {

        channel.close();

      }

      if (raf != null)

      {

        raf.close();

      }

    }

  }

Regular Expression: detect executables

String test = "c:\\test\\test.bat"; if (test.matches("^.*\\.(exe|scr|pif|vb[es]|js|jse|ws[fh]|sh[sb]|lnk|bat|cmd|com|ht[ab])|$")) { System.out.println("block"); } else { System.out.println("pass"); }

Installing Python 2.7 on SLES 11


#!/bin/bash
# Install Python 2.7.2 alternatively
zypper install -t pattern sdk_c_c++ -y
zypper install readline-devel openssl-devel gmp-devel ncurses-devel gdbm-devel zlib-devel expat-devel libGL-devel tk tix gcc-c++ libX11-devel glibc-devel bzip2 tar tcl-devel tk-devel pkgconfig tix-devel bzip2-devel sqlite-devel autoconf db4-devel libffi-devel valgrind-devel -y

mkdir tmp
cd tmp
wget http://python.org/ftp/python/2.7.2/Python-2.7.2.tgz
tar xvfz Python-2.7.2.tgz
cd Python-2.7.2
./configure --prefix=/opt/python2.7 --enable-shared
make
make altinstall
echo "/opt/python2.7/lib" >> /etc/ld.so.conf.d/opt-python2.7.conf
ldconfig
cd ..
cd ..
rm -rf tmp




# source: https://stackoverflow.com/questions/10940296/installing-python-2-7-on-sles-11

strato DDNS VBS Client

看了几款网上的DDNS Client。有些是Shareware要付费的，有些功能不符合。最后还是写了个VBS的DDNS Client。大家可以把他添加到Windows Task Scheduler里面，让它定时通过DDNS更新external的IP。

以下是给德国Strato公司配置的（其它DDNS可见最后的Comment），在使用前按需要先修改host，pass等variables：


' === settings ===
host = "<HOST>"
pass = "<PASSWORD>"
url = "https://dyndns.strato.com/nic/update?hostname=" & host & "&system=dyndns&wildcard=OFF&backmx=NO&offline=NO"
pth = "D:\ddns-client.log"

' === ddns client ===
Dim oQuery: Set oQuery = CreateObject("MSXML2.XMLHTTP.3.0")
Dim oLogger: Set oLogger = CreateObject("Scripting.FileSystemObject")

Sub Debug (pth, str)
	msg = date & " " & time & ": " & str
	Set oLogFile = oLogger.OpenTextFile(pth, 8, True, 0)
	oLogFile.Write msg	
	oLogFile.Close
End Sub

Function ResolveIP(host)
    oQuery.Open "GET", "http://ip-lookup.net/domain.php?domain=" & host, False
    oQuery.Send
    If oQuery.Status = 200 Then
        Set RegEx = New RegExp
        RegEx.Global = True
        RegEx.Pattern = "http://ip-lookup.net\?(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})"
        Set matches = RegEx.Execute(oQuery.responseText)
          If matches.Count > 0 Then
            ResolveIP = matches(0).SubMatches(0)
          End If
    End If
End Function

Function GetMyIP()
    oQuery.Open "GET", "https://ip.appspot.com/", False
    oQuery.Send
    If oQuery.Status = 200 Then
        GetMyIP = Replace(Replace(oQuery.responseText, vbLf, ""), vbCr, "")
    End If
End Function

Function Query(url, host, pass, ip)
	If ip  "" Then
		url = url & "&myip=" & ip
	End If
	oQuery.Open "GET", url, False, host, pass
	oQuery.Send
	If oQuery.Status = 200 And (InStr(oQuery.responseText, "good") Or InStr(oQuery.responseText, "nochg")) Then
		Query = "ok, " & oQuery.Status & ", " & oQuery.responseText
	Else
		Query = "failed, " & oQuery.Status
	End If
End Function

' === main ===
externalIp = GetMyIP()
currentIp = ResolveIP(host)
Debug pth, host & ": current ip=" & currentIp & ", external ip=" & externalIp

If externalIp <> currentIp Then
  rsp = Query(url, host, pass, ip)
  Debug pth, rsp
Else
  Debug pth, "ok"
End If



' === list of response codes ===
' good - Update successfully.
' nochg - Update successfully but the IP address have not changed.
' nohost - The hostname specified does not exist in this user account.
' abuse - The hostname specified is blocked for update abuse.
' notfqdn - The hostname specified is not a fully-qualified domain name.
' badauth - Authenticate failed.
' 911 - There is a problem or scheduled maintenance on provider side
' badagent - The user agent sent bad request(like HTTP method/parameters is not permitted)
' badresolv - Failed to connect to because failed to resolve provider address.
' badconn - Failed to connect to provider because connection timeout.
' === list of ddns providers ===
'DYNDNS.org
'http://members.dyndns.org/nic/update?hostname=[HOST]&myip=[IP]&system=dyndns&wildcard=NOCHG&mx=NOCHG&backmx=NOCHG
'TwoDNS.de
'http://update.twodns.de/update.php?hostname=[HOST]&myip=[IP]
'NoIP.com
'http://dynupdate.no-ip.com/nic/update?hostname=[HOST]&myip=[IP]
'able.or.kr
'http://able.or.kr/ddns/src/update.php?hostname=[HOST]&myip=[IP]&ddnsuser=[USER]&pwd=[PASS]
'3322.org
'http://www.3322.org/dyndns/update?hostname=[HOST]&system=dyndns
'selfHOST.de
'http://carol.selfhost.de/nic/update?hostname=[HOST]&myip=[IP]
'Dynamic DO!.jp
'http://free.ddo.jp/dnsupdate.php?dn=[HOST]&pw=[PASS]&ip=[IP]
'ChangeIP.com
'http://nic.ChangeIP.com/nic/update?hostname=[HOST]&myip=[IP]&system=dyndns
'DNSPod.com
'http://dnsapi.cn/Record.Modify?login_email=[USER]&login_password=[PASS]&format=xml&domain_id=[DOMAIN_ID]&record_id=[RECORD_ID]&sub_domain=[SUBDOMAIN]&record_type=A&record_line=[RECORDLINE]&value=[IP]&mx=[MX]&ttl=[TTL]
'Zoneedit.com
'http://dynamic.zoneedit.com/auth/dynamic.html?host=[HOST]&dnsto=[IP]
'Freedns.org
'http://freedns.afraid.org/dynamic/update.php?user=[FREE_DNS_SHA1]&host=[HOST]& address=[IP]
'STRATO
'http://[USER]:[PASS]@dyndns.strato.com/nic/update?hostname=[HOST]&myip=[IP]&wildcard=NOCHG&mx=NOCHG&backmx=NOCHG

设置Visual Studio界面语言

打开Visual Studio
Tools\Options => Environment\International Settings
下载或选择英文
右键点击Visual Studio程序Icon
在target里添加”/lcid 1033″，如下
“C:\Programme (x86)\Microsoft Visual Studio 11.0\Common7\IDE\devenv.exe” /lcid 1033
重新打开Visual Studio, Voilà!

取消中文Windows系统IME转换键Strg+Space

Eclipse, IntelliJ, Visual Studio等IDE里往往Strg+Space会作为Autocomplete/Autocorrection的Hotkey。而在windows系统里安装了中文IME以后这个组合键被霸占以用作为IME之间的互换。因为一个Bug这个组合键不能被修改或覆盖。

以下是把这个组合键删除的方法(适用于windows xp, vista, 7)：

> regedt32

> HKEY_CURRENT_USER/Control Panel/Input Method/Hot Keys

> 选择 00000070 ("Chinese (Traditional) IME - Ime/NonIme Toggle")

> 把’Key Modifiers’的数值修改为’00 c0 00 00‘

> 把’Virtual Key’的数值修改为’ff 00 00 00’

> 选择 00000010("Chinese (Simplified) IME - Ime/NonIme Toggle")