John Dalesandro - Page 19 of 19 - Technology to get things done

Here is a quick and dirty way to simulate a keypress using the Robot class in Java. If you provide a string to the constructor and call the type() method, each of the characters in the string will be generated as a keypress. The code only supports A-Z and a-z, but could be modified to cover a larger character set.

import java.awt.Robot;
import java.awt.event.KeyEvent;

public class Typer {
  private Robot robot = null;
  private String characters = null;

public Typer(String characters) {
    if((characters == null) || ("").equals(characters.trim())) {
      characters = "";
    }
    this.characters = characters;

try {
      robot = new Robot();
    } catch(Exception e) {
    }
    return;
  }

public String getCharacters() {
    return characters;
  }

public boolean type() {
    if(robot == null) {
      return false;
    }

for(int i = 0; i < this.getCharacters().length(); i++) {
      robot.keyPress(typeLetter(this.getCharacters().charAt(i)));
    }
    robot.keyPress(KeyEvent.VK_ENTER);
    return true;
  }

protected boolean delay(int delay) {
    if(this.robot != null) {
      robot.delay(delay);
      return true;
    }
    return false;
  }

private int typeLetter(char c) {
    int keyEvent = 0;

try {
      switch(c) {
      case 'a':
      case 'A':
        keyEvent = KeyEvent.VK_A;
        break;
      case 'b':
      case 'B':
        keyEvent = KeyEvent.VK_B;
        break;
      case 'c':
      case 'C':
        keyEvent = KeyEvent.VK_C;
        break;
      case 'd':
      case 'D':
        keyEvent = KeyEvent.VK_D;
        break;
      case 'e':
      case 'E':
        keyEvent = KeyEvent.VK_E;
        break;
      case 'f':
      case 'F':
        keyEvent = KeyEvent.VK_F;
        break;
      case 'g':
      case 'G':
        keyEvent = KeyEvent.VK_G;
        break;
      case 'h':
      case 'H':
        keyEvent = KeyEvent.VK_H;
        break;
      case 'i':
      case 'I':
        keyEvent = KeyEvent.VK_I;
        break;
      case 'j':
      case 'J':
        keyEvent = KeyEvent.VK_J;
        break;
      case 'k':
      case 'K':
        keyEvent = KeyEvent.VK_K;
        break;
      case 'l':
      case 'L':
        keyEvent = KeyEvent.VK_L;
        break;
      case 'm':
      case 'M':
        keyEvent = KeyEvent.VK_M;
        break;
      case 'n':
      case 'N':
        keyEvent = KeyEvent.VK_N;
        break;
      case 'o':
      case 'O':
        keyEvent = KeyEvent.VK_O;
        break;
      case 'p':
      case 'P':
        keyEvent = KeyEvent.VK_P;
        break;
      case 'q':
      case 'Q':
        keyEvent = KeyEvent.VK_Q;
        break;
      case 'r':
      case 'R':
        keyEvent = KeyEvent.VK_R;
        break;
      case 's':
      case 'S':
        keyEvent = KeyEvent.VK_S;
        break;
      case 't':
      case 'T':
        keyEvent = KeyEvent.VK_T;
        break;
      case 'u':
      case 'U':
        keyEvent = KeyEvent.VK_U;
        break;
      case 'v':
      case 'V':
        keyEvent = KeyEvent.VK_V;
        break;
      case 'w':
      case 'W':
        keyEvent = KeyEvent.VK_W;
        break;
      case 'x':
      case 'X':
        keyEvent = KeyEvent.VK_X;
        break;
      case 'y':
      case 'Y':
        keyEvent = KeyEvent.VK_Y;
        break;
      case 'z':
      case 'Z':
        keyEvent = KeyEvent.VK_Z;
        break;
      }
    } catch(Exception e) {
    }
    return keyEvent;
  }
}

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import java.awt.Robot;

import java.awt.event.KeyEvent;

public class Typer {

private Robot robot = null;

private String characters = null;

public Typer(String characters) {

if((characters == null) || ("").equals(characters.trim())) {

characters = "";

}

this.characters = characters;

try {

robot = new Robot();

} catch(Exception e) {

}

return;

}

public String getCharacters() {

return characters;

}

public boolean type() {

if(robot == null) {

return false;

}

for(int i = 0; i < this.getCharacters().length(); i++) {

robot.keyPress(typeLetter(this.getCharacters().charAt(i)));

}

robot.keyPress(KeyEvent.VK_ENTER);

return true;

}

protected boolean delay(int delay) {

if(this.robot != null) {

robot.delay(delay);

return true;

}

return false;

}

private int typeLetter(char c) {

int keyEvent = 0;

try {

switch(c) {

case 'a':

case 'A':

keyEvent = KeyEvent.VK_A;

break;

case 'b':

case 'B':

keyEvent = KeyEvent.VK_B;

break;

case 'c':

case 'C':

keyEvent = KeyEvent.VK_C;

break;

case 'd':

case 'D':

keyEvent = KeyEvent.VK_D;

break;

case 'e':

case 'E':

keyEvent = KeyEvent.VK_E;

break;

case 'f':

case 'F':

keyEvent = KeyEvent.VK_F;

break;

case 'g':

case 'G':

keyEvent = KeyEvent.VK_G;

break;

case 'h':

case 'H':

keyEvent = KeyEvent.VK_H;

break;

case 'i':

case 'I':

keyEvent = KeyEvent.VK_I;

break;

case 'j':

case 'J':

keyEvent = KeyEvent.VK_J;

break;

case 'k':

case 'K':

keyEvent = KeyEvent.VK_K;

break;

case 'l':

case 'L':

keyEvent = KeyEvent.VK_L;

break;

case 'm':

case 'M':

keyEvent = KeyEvent.VK_M;

break;

case 'n':

case 'N':

keyEvent = KeyEvent.VK_N;

break;

case 'o':

case 'O':

keyEvent = KeyEvent.VK_O;

break;

case 'p':

case 'P':

keyEvent = KeyEvent.VK_P;

break;

case 'q':

case 'Q':

keyEvent = KeyEvent.VK_Q;

break;

case 'r':

case 'R':

keyEvent = KeyEvent.VK_R;

break;

case 's':

case 'S':

keyEvent = KeyEvent.VK_S;

break;

case 't':

case 'T':

keyEvent = KeyEvent.VK_T;

break;

case 'u':

case 'U':

keyEvent = KeyEvent.VK_U;

break;

case 'v':

case 'V':

keyEvent = KeyEvent.VK_V;

break;

case 'w':

case 'W':

keyEvent = KeyEvent.VK_W;

break;

case 'x':

case 'X':

keyEvent = KeyEvent.VK_X;

break;

case 'y':

case 'Y':

keyEvent = KeyEvent.VK_Y;

break;

case 'z':

case 'Z':

keyEvent = KeyEvent.VK_Z;

break;

}

} catch(Exception e) {

}

return keyEvent;

}

This is a recursive function to generate all permutations of a string in Java. For example, if “abc” is entered, the code will generate all permutations of length 1 to 3 characters: a, b, c, ab, ac, ba, bc, ca, cb, abc, acb, bac, bca, cab, cba.

import java.util.ArrayList;

public class Permutation {
  private ArrayList permutations = null;
  private String characters = null;

public Permutation(String characters) {
    if((characters == null) || ("").equals(characters.trim())) {
      characters = "";
    }
    this.characters = characters;
  }

public String getCharacters() {
    return characters;
  }

public ArrayList getPermutations() {
    this.permutations = new ArrayList();

for(int j = 1; j <= getCharacters().length(); j++) {
      permute("",getCharacters(),j);
    }
    return this.permutations;
  }

protected void permute(String prefix,String s,int length) {
    String word = null;

for(int i = 0; i < s.length(); i++) {
      word = prefix+s.charAt(i);

if(word.length() == length) {
        permutations.add(word);
      } else {
        if(i == 0) {
          permute(word,s.substring(i+1,s.length()),length);
        } else if(i == (s.length()-1)) {
          permute(word,s.substring(0,s.length()-1),length);
        } else {
          permute(word,(s.substring(0,i)+s.substring(i+1,s.length())),length);
        }
      }
    }
    return;
  }
}

import java.util.ArrayList;

public class Permutation {

private ArrayList permutations = null;

private String characters = null;

public Permutation(String characters) {

if((characters == null) || ("").equals(characters.trim())) {

characters = "";

}

this.characters = characters;

}

public String getCharacters() {

return characters;

}

public ArrayList getPermutations() {

this.permutations = new ArrayList();

for(int j = 1; j <= getCharacters().length(); j++) {

permute("",getCharacters(),j);

}

return this.permutations;

}

protected void permute(String prefix,String s,int length) {

String word = null;

for(int i = 0; i < s.length(); i++) {

word = prefix+s.charAt(i);

if(word.length() == length) {

permutations.add(word);

} else {

if(i == 0) {

permute(word,s.substring(i+1,s.length()),length);

} else if(i == (s.length()-1)) {

permute(word,s.substring(0,s.length()-1),length);

} else {

permute(word,(s.substring(0,i)+s.substring(i+1,s.length())),length);

}

return;

}

Keypress Generator

Generate All Permutations of a String in Java