properties.java

java写的图片浏览器,类似acds

package org.net9.oops.jsee;

/**
 * Neo Maohesong 2002-03-05
 */
import java.io.*;
/**
 * A class set properties to the user's home directory and
 * get properties from it
 * @version created 2002-03-05 last modified 2002-03-09
 * @author Neoya M  <[e-mail]>
 */
public class Properties{
    //Property names
    public static final String SMALL_SPANE=             "SMALL_SPANE";
    public static final String SPANE=                   "SPANE";
    public static final String COLUMN_LAYOUT=           "COLUMN_LAYOUT";
    public static final String SCALE_QUALITY=           "SCALE_QUALITY";
    public static final String VIEW_FULL_SCREEN=        "VIEW_FULL_SCREEN";
    public static final String AUTO_SIZE_PREVIEW=       "AUTO_SIZE_PREVIEW";
    public static final String HIDE_PREVIEW=            "HIDE_PREVIEW";
    public static final String THUMBNAIL_SHOW=          "THUMBNAIL_SHOW";
    public static final String SAVE_PREVIOUS_OPTION=    "SAVE_PREVIOUS_OPTION";
    public static final String PATH=                    "PATH";
    public static final String WIDTH=                   "WIDTH";
    public static final String HEIGHT=                  "HEIGHT";

    public static final String SHOW_COLUMN_SIZE=        "Size";
    public static final String SHOW_COLUMN_DATE=        "Date";
    public static final String SHOW_COLUMN_TYPE=        "Type";
    public static final String SHOW_COLUMN_PROPERTIES=  "Properties";

    //Property values
    public static final int COLUMN_LAYOUT_PREVIEW=      1;
    public static final int COLUMN_LAYOUT_LIST=         2;

    private BufferedReader reader;
    private BufferedWriter writer;
    private String filename;
    Properties(){
        String userHomeDir = System.getProperty( "user.home" );
        filename=userHomeDir + "/" + ".JCDSee.cfg";
    }
    /**
     * Get the property by name
     * Read lines throw the Properties file until a matched name
     */
    public String getProperty(String name){
        try{
            reader=new BufferedReader(
                   new FileReader(filename));
            String s;
            while(!((s=reader.readLine())==null)){
                if (s.startsWith(name))
                    return s.substring(name.length()+3);
            }
            reader.close();
            return "";
        }catch(FileNotFoundException e){
            System.out.println("Property File Not Found,Use Default Value");
            return "";
        }catch(IOException e){
            e.printStackTrace();
            return "";
        }catch(NullPointerException e){
            return "";
        }
    }
    public int getIntProperty(String name){
        String s=getProperty(name);
        try{
            if (s==null || s.equals(""))
                return 0;
            else
                return Integer.parseInt(s);
        }catch(NumberFormatException e){
            System.out.println("NumberFormatException at getIntProperty()");
            return 0;
        }
    }
    public boolean getBooleanProperty(String name){
        String s=getProperty(name);
        try{
            if (s==null || s.equals("")) {
                return true;//Default true
            }
            else {
                return Boolean.valueOf(s).booleanValue();
            }
        }catch(NumberFormatException e){
            System.out.println("NumberFormatException at getBooleanProperty()");
            return false;
        }
    }
    /**
     * Set the property to the file by name
     * First read the whole properties files and replace the new preperty by name
     * Second write the replaced string to the file
     */
    public void setProperty(String name,String value){
        StringBuffer sb=new StringBuffer();
        boolean exist=false;
        try{
            reader=new BufferedReader(
                   new FileReader(filename));
            String s;
            while(!((s=reader.readLine())==null)){
                if (s.startsWith(name)){
                    sb.append(name+" = "+value+"\n");
                    exist=true;
                }else
                    sb.append(s+"\n");
            }
            reader.close();
        }catch(FileNotFoundException e){
            System.out.println("Property File Not Found,Use Default Value");
        }catch(IOException e){
            e.printStackTrace();
        }catch(NullPointerException e){
        }
        //The file may not exist,so put these codes here not in the above brock
        if(exist==false)
            sb.append(name+" = "+value);
        try{
            writer=new BufferedWriter(
                   new FileWriter(filename));
            writer.write(sb.toString());
            writer.close();
        }catch(IOException e){
            e.printStackTrace();
        }
    }
    /**
     * Overloaded method
     * @param int value
     */
    public void setProperty(String name,int value){
        String s=String.valueOf(value);
        this.setProperty(name,s);
    }
    /**
     * Overloaded method
     * @param boolean value
     */
    public void setProperty(String name,boolean value){
        String s=value?"true":"false";
        this.setProperty(name,s);
    }
}