Java Properties类 按输入顺序输出，每条添加注释

    今天想把输入Property类的信息，输出看一下，输出之后发现顺序是乱的，后来看了代码才明白怎么回事，于是决定自己瞎写一个，经测试还能用。望各位大神观摩指导。。。。

import java.io.BufferedWriter;import java.io.IOException;import java.io.Writer;import java.util.Date;import java.util.Iterator;import java.util.LinkedHashMap;import java.util.Properties;/** * This class is to provide function output properties by input order and add comment to each property. * @author zhengfan1 */public class OutputOrderProperties extends Properties{private LinkedHashMap<String, String> commentMap = new LinkedHashMap<String,String>();/** * Version ID */private static final long serialVersionUID = 1L;/** * Constructor. */public OutputOrderProperties(){super();}/** * Constructor. * @param properties * the java propertis. */public OutputOrderProperties(Properties properties){super(properties);//Initialize the comment.Iterator<Object> iterator = properties.keySet().iterator();while(iterator.hasNext()){Object key = iterator.next();this.commentMap.put((String) key, null);}}/** * Add comment to a property. * @param key * the key of the property. * @param comment * the comment of the property. * @return * true => add it * false => don't have this key. */public boolean addComment(String key , String comment){if(this.contains(key)){this.commentMap.put(key, comment);return true;}return false;}/** * To set property. * @param key * the key of property. * @param value * the value of property. * @param comment * the comment of property. */public void setP(String key , String value , String comment){this.commentMap.put(key, comment);this.setProperty(key, value);}/** * To output according to the order of input. * @param writer * the writer * @param comments * the comments of this property file. * @throws IOException * exception. */public void orderStore(Writer writer , String comments) throws IOException{BufferedWriter bufferedWriter = (writer instanceof BufferedWriter) ? (BufferedWriter)writer : new BufferedWriter(writer);if (comments != null) {OutputOrderProperties.writeComments(bufferedWriter, comments);    }    bufferedWriter.write("#" + new Date().toString());    bufferedWriter.newLine();    bufferedWriter.newLine();        synchronized (this)     {    Iterator<String> iterator = this.commentMap.keySet().iterator();    while(iterator.hasNext())    {    String key = iterator.next();    String value = this.getProperty(key);    String comment = this.commentMap.get(key);    key = saveConvert(key, true, false);        value = saveConvert(value, false, false);    key = saveConvert(key, true, false);    if(comment != null && ! comment.equals(""))    {    writeComments(bufferedWriter, comment);    }    bufferedWriter.write(key+"="+value);    bufferedWriter.newLine();    bufferedWriter.newLine();    }         }    bufferedWriter.flush();    } /*     * Converts unicodes to encoded \uxxxx and escapes     * special characters with a preceding slash     * !!! Copy from java source code.     */    private String saveConvert(String theString,       boolean escapeSpace,       boolean escapeUnicode) {        int len = theString.length();        int bufLen = len * 2;        if (bufLen < 0) {            bufLen = Integer.MAX_VALUE;        }        StringBuffer outBuffer = new StringBuffer(bufLen);        for(int x=0; x<len; x++) {            char aChar = theString.charAt(x);            // Handle common case first, selecting largest block that            // avoids the specials below            if ((aChar > 61) && (aChar < 127)) {                if (aChar == '\\') {                    outBuffer.append('\\'); outBuffer.append('\\');                    continue;                }                outBuffer.append(aChar);                continue;            }            switch(aChar) {case ' ':    if (x == 0 || escapeSpace) outBuffer.append('\\');    outBuffer.append(' ');    break;                case '\t':outBuffer.append('\\'); outBuffer.append('t');                          break;                case '\n':outBuffer.append('\\'); outBuffer.append('n');                          break;                case '\r':outBuffer.append('\\'); outBuffer.append('r');                          break;                case '\f':outBuffer.append('\\'); outBuffer.append('f');                          break;                case '=': // Fall through                case ':': // Fall through                case '#': // Fall through                case '!':                    outBuffer.append('\\'); outBuffer.append(aChar);                    break;                default:                    if (((aChar < 0x0020) || (aChar > 0x007e)) & escapeUnicode ) {                        outBuffer.append('\\');                        outBuffer.append('u');                        outBuffer.append(toHex((aChar >> 12) & 0xF));                        outBuffer.append(toHex((aChar >>  8) & 0xF));                        outBuffer.append(toHex((aChar >>  4) & 0xF));                        outBuffer.append(toHex( aChar        & 0xF));                    } else {                        outBuffer.append(aChar);                    }            }        }        return outBuffer.toString();    }    /*     * !!!Copy from java source code.     */private static void writeComments(BufferedWriter bw, String comments)         throws IOException {        bw.write("#");        int len = comments.length();          int current = 0;        int last = 0;        char[] uu = new char[6];        uu[0] = '\\';        uu[1] = 'u';        while (current < len) {            char c = comments.charAt(current);    if (c > '\u00ff' || c == '\n' || c == '\r') {        if (last != current)                     bw.write(comments.substring(last, current));                if (c > '\u00ff') {                    uu[2] = toHex((c >> 12) & 0xf);                    uu[3] = toHex((c >>  8) & 0xf);                    uu[4] = toHex((c >>  4) & 0xf);                    uu[5] = toHex( c        & 0xf);                    bw.write(new String(uu));                } else {                    bw.newLine();                    if (c == '\r' && current != len - 1 && comments.charAt(current + 1) == '\n') {                        current++;                    }                    if (current == len - 1 ||                        (comments.charAt(current + 1) != '#' &&comments.charAt(current + 1) != '!'))                        bw.write("#");                }                last = current + 1;    }             current++;}        if (last != current)             bw.write(comments.substring(last, current));        bw.newLine();    }/* * !!! Copy from java source code. */private static char toHex(int nibble) {return hexDigit[(nibble & 0xF)];    }    /** A table of hex digits */    private static final char[] hexDigit = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'    };}

主要是实现两个功能：
1.顺序输出：
    用户通过使用方法setP来插入数据，三个参数分别为key，value，和comment。之后通过orderStore来输出内容。
2.为每条属性添加注释
    通过setP方法添加的属性都会有注释参数。如果只想使用注释这个功能，可以通过java的Properties类来构造此类对象，之后通过addComment方法来为想要添加的属性添加注释

测试程序：

public static void main(String[] args) throws IOException {OutputOrderProperties properties = new OutputOrderProperties();FileOutputStream fileOutputStream = new FileOutputStream("test.properties");OutputStreamWriter writer = new OutputStreamWriter(fileOutputStream);for(int i=0 ; i<10; i++){String string = String.valueOf(i);properties.setP("Name"+string, string, "the name of "+string);}properties.orderStore(writer, "This is a test process...");}

结果：

#This is a test process...#Wed Mar 13 15:34:03 CST 2013#the name of 0Name0=0#the name of 1Name1=1#the name of 2Name2=2#the name of 3Name3=3#the name of 4Name4=4#the name of 5Name5=5#the name of 6Name6=6#the name of 7Name7=7#the name of 8Name8=8#the name of 9Name9=9