drawfiles.java

简单的JAVA小程序,可以读取文档,根据你TXT文件里的数值进行简单符号画图

import java.io.*;
import java.util.*;


public class DrawFiles {

  	public static void underLinedPrint( String value ){
     		System.out.println(value);
     		for (int i=0;i<value.length();i++){
        		System.out.print("=");
     		}
  	}// end of underLinePrint method

   	private static int promptAndReadValue( String value ) {
      		while (true){
            		int length;
            		UserInput.prompt("Enter the "+value+":");
            		length=UserInput.readInt();
            		if (length<0){
            		   	System.out.println("The value of "+value+" must be positive!");
               		continue;
            		}
            		else {
               		return length;
            		}

      		}// end of while
  	}// end of promptAndReadVAlue method

	private static String promptAndReadFileName (String value) {
		while(true) {
			UserInput.prompt("Enter the "+value+" file name:");
			String name=UserInput.readString();
			File inputFile=new File(name);
			if(!inputFile.exists()) {
				System.out.println("Could not find file named "+name);
			} else {
				return name;
			}
		} //end of while
	} //end of promptAndReadFileName method

	private static void runMainMenu(){
     		underLinedPrint("Main Menu");
     		System.out.println("\nH) Create Horizontal Line");
     		System.out.println("V) Create Vertical Line");
     		System.out.println("S) Create Square");
     		System.out.println("R) Create Rectangle");
			System.out.println("F) Create from file");
     		System.out.println("Q) Quit");
     		System.out.print("Enter choice:");
  	}// end of runMainMenu method

	private static void runOptionsMenu( String name ){
     		underLinedPrint("\nOptions Menu");
	     	System.out.println("\n1) Print "+name+"'s properties");
     		System.out.println("2) Draw "+name+" to screen");
			System.out.println("3) Draw "+name+" to file");
     		System.out.println("4) Return to main menu");
     		System.out.print("Enter choice:");
	}// end of runOptionMenu method

	private static Line createLine( boolean isHorizontal ){
          	int linelength=promptAndReadValue("length");
       		Line newline=new Line(isHorizontal, linelength);

       		return newline;
   	}

	private static void processLine( Line myLine ) {
		while (true){
           		runOptionsMenu(myLine.getName());
           		int choice=UserInput.readInt();
           		switch (choice){
                        	case 1:
                                	myLine.print();
                                	break;
                          	case 2:
                                	drawToScreen(myLine.toASCIIDrawing());
                                	break;
                        	case 3:
                                	drawToFile(myLine.toASCIIDrawing());
                                	break;
                           case 4:
                                	return;
          		}
       	}
   	}

 	private static Rectangle createRectangle( boolean isSquare ){
     		int height;
      		int width = promptAndReadValue("width");
      		if (isSquare) {
	     		height=width;
      		}
      		else{
	     		height=promptAndReadValue("height");
	  	}
      		Rectangle newRectangle = new Rectangle(isSquare,width,height);
      		return newRectangle;
   	}

	private static void processRectangle (Rectangle myRectangle) {
		while (true){
          		runOptionsMenu(myRectangle.getName());
          		int choice=UserInput.readInt();
          		switch (choice){
                       	case 1:
                              	myRectangle.print();
                              	break;
                      	case 2:
                              	drawToScreen(myRectangle.toASCIIDrawing());
                              	break;
                     	case 3:
                              	drawToFile(myRectangle.toASCIIDrawing());
                              	break;

                      	case 4:
                             	return;
          		}
       	}
	}

	private static void createFromFile() {
			try {
				String txtname=promptAndReadFileName("input");
				FileReader fr1=new FileReader(txtname);
				BufferedReader br1=new BufferedReader(fr1);
				String s;
				while ((s=br1.readLine())!=null) {
					parseLine(s);
				}
				fr1.close();
			} catch(FileNotFoundException e) {
				System.out.println(e.getMessage());
			}catch(IOException e) {
				System.out.println(e.getMessage());
			} // end try...catch
	} //end createFromFile method

	private static void parseLine(String line) {
			boolean check=false;
			String delimiters="\\s+|,\\s*|\\.\\s*";
			String[] tokens=line.split(delimiters);
      		String str=new String();
      		for(int i=0;i<tokens.length;i++){
         		str=str+tokens[i];
      		}
      		char[] strArray=str.toCharArray();

      		if (strArray[0]!='v'&&strArray[0]!='V'&&strArray[0]!='h'&&strArray[0]!='H'&&strArray[0]!='s'&&strArray[0]!='S'&&strArray[0]!='r'&&strArray[0]!='R'){
         		System.out.println("ERROR: Unknown type found when parsing file");
         		return;
      		}

      		if (strArray[0]=='v'||strArray[0]=='V'){
         		if (tokens.length!=2){
            			System.out.println("ERROR: Type structure could not be parsed");
            			return;
         		}
         		if (tokens[1].compareTo("0")<0){
				        System.out.println("ERROR: Negative number found when parsing file");
				        return;
				}

         		if (!Character.isDigit(strArray[1])) {
					System.out.println("ERROR: Type structure could not be parsed");
            		return;
				}

         		Line vl=new Line(false,Character.getNumericValue(strArray[1]));
         		processLine(vl);
      		}

      		if (strArray[0]=='h'||strArray[0]=='H'){
         		if (tokens[1].compareTo("0")<0){
				    System.out.println("ERROR: Negative number found when parsing file");
					return;
         		}
         		if (!Character.isDigit(strArray[1])) {
					System.out.println("ERROR: Type structure could not be parsed");
				    return;
				}
         		if (tokens.length!=2){
            			System.out.println("ERROR: Type structure could not be parsed");
            			return;
         		}

	         	Line hl=new Line(true,Character.getNumericValue(strArray[1]));
         		processLine(hl);
            }

      		if (strArray[0]=='s'||strArray[0]=='S'){
         		if (tokens.length!=2){
            		System.out.println("ERROR: Type structure could not be parsed");
            		return;
         		}
         		if (tokens[1].compareTo("0")<0){
            			System.out.println("ERROR: Negative number found when parsing file");
            			return;
         		}
         		if (!Character.isDigit(strArray[1])) {
					System.out.println("ERROR: Type structure could not be parsed");
            		return;
				}

         		Rectangle sq=new Rectangle(true);
         		sq.setWidth(Character.getNumericValue(strArray[1]));
         		processRectangle(sq);
      		}

      		if (strArray[0]=='r'||strArray[0]=='R'){
         		if (tokens.length!=3){
            			System.out.println("ERROR: Type structure could not be parsed");
            			return;
         		}
         		if (tokens[1].compareTo("0")<0||tokens[2].compareTo("0")<0){
            			System.out.println("ERROR: Negative number found when parsing file");
            			return;
         		}
         		if (!Character.isDigit(strArray[1])||!Character.isDigit(strArray[2])) {
					System.out.println("ERROR: Type structure could not be parsed");
            		return;
				}


         		Rectangle rect=new Rectangle(false);
         		rect.setWidth(Character.getNumericValue(strArray[1]));
         		rect.setHeight(Character.getNumericValue(strArray[2]));
         		processRectangle(rect);
		}
	}

	private static void drawToScreen(String input){
      		System.out.println(input);
  	}

	private static void drawToFile(String input) {
		try{
			String txtname = promptAndReadFileName("output");
	          	FileWriter fr = new FileWriter(txtname);
	          	fr.write (input);
	          	fr.close();
		} catch (FileNotFoundException e) {
			System.out.println(e.getMessage());
		} catch (IOException e) {
			System.out.println(e.getMessage());
		}
	}

	public static void main(String[] args){
      		char choice1;
      		int choice2;
      		Out:
      		while (true){

         		runMainMenu();
         		choice1=UserInput.readChar();
         		switch (choice1){

               		case 'h':
               		case 'H':
                          	Line kevin1=createLine(true);
                       		processLine(kevin1);
                       		break;

               		case 'v':
               		case 'V':

                       	 	Line kevin2=createLine(false);
                        	processLine(kevin2);
							break;

               		case 's':
               		case 'S':
                        	Rectangle kevin3=createRectangle(true);
							processRectangle(kevin3);
							break;

               		case 'r':
               		case 'R':
                        	Rectangle kevin4=createRectangle(false);
                       		processRectangle(kevin4);
							break;

					case 'f':
					case 'F':
							createFromFile();
							break;

               		case 'q':
               		case 'Q':
                        	System.exit(0);
         		}// end of switch

      		}//end of while

   	}//end of main

}//end of class