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J2me实现类似的类Properties.java

原创|其它|编辑:郝浩|2009-10-19 13:19:40.000|阅读 705 次

概述:实现了J2SE的java.util.Properties类,可以用来读取内容类似本文的配置文件。

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  实现了J2SE的java.util.Properties类,可以用来读取内容类似下面这样的配置文件:

  ===============================================

  #这是注释

  screen_width=240

  screen_height=238

  myname = rocks

  mybirth = \u00d7\u00f7\u00d5\u00df\u00c9\u00fa\u00c8\u00d5

  ===============================================

  这样使用:

  Properties prop = new Properties();

  InputStream is = this.getClass().getResourceAsStream("conf.prop"); prop.load(is); is.close(); String name = prop.getProperty("myname"); ...为了省空间和提高性能我把解析unicode的那部分注释起来了,如果你需要支持中文(就像上面的mybirth那样的),把那些注释起来的代码恢复就可以了。

  代码:

  --------------------------------------------------------------------------------
 
 package com.joyamigo.util; import java.io.*; import java.util.Hashtable; import java.util.Enumeration; public class Properties extends java.util.Hashtable {
  public Properties() {
  super();
  }
  public String getProperty(String key) {
  return (String)this.get(key);
  }
  public String getProperty(String key, String defaultValue) { Object ret = this.get(key); return ret == null ? defaultValue : (String)ret;
  }
  public Object setProperty(String key, String value) { return this.put(key, value);
  }
  public void list(PrintStream out) {
  Enumeration e = this.keys(); while (e.hasMoreElements()) { Object key = e.nextElement(); Object value = this.get(key); out.println(key+"="+value);
  }
  }
  public void load(InputStream is) throws IOException {
  this.load(is, "ISO8859_1");
  }
  public void load(InputStream is, String enc) throws IOException { Reader reader = new InputStreamReader(is, enc);
  boolean reading = true;
  StringBuffer buf = new StringBuffer();
  while (reading) {
  int c = reader.read();
  switch (c) {
  case -1:
  reading = false;
  break;
  case (int)'\r':
  break;
  case (int)'\n':
  Object[] pair = parseLine(buf.toString()); if (pair != null) { this.put(pair[0], pair[1]);
  }
  buf.setLength(0);
  break;
  default:
  buf.append((char)c);
  }
  }
  Object[] pair = parseLine(buf.toString()); if (pair != null) { this.put(pair[0], pair[1]);
  }
  }
  public void store(OutputStream out, String header) throws IOException { this.store(out, "ISO8859_1", header);
  }
  public void store(OutputStream out, String enc, String header) throws IOException { Writer writer = new OutputStreamWriter(out, enc); if (header != null) { writer.write("#"+header+"\n");
  }
  Enumeration e = this.keys(); while (e.hasMoreElements()) { Object key = e.nextElement(); String value = (String)this.get(key); //writer.write(key+"="+rconvUnicode(value)+"\n"); writer.write(key+"="+value+"\n");
  }
  }
  private Object[] parseLine(String line) {
  if (line == null || line.trim().length() == 0) {
  return null;
  }
  line = line.trim(); if (line.startsWith("#") || line.startsWith("!")) { // is comment line
  return null;
  }
  int idx = line.indexOf("=");
  if (idx == -1) {
  //return new String[] { convUnicode(line), "" }; return new String[] { line, "" };
  } else {
  //return new String[] { convUnicode(line.substring(0, idx).trim()), // convUnicode(line.substring(idx+1).trim()) }; return new String[] { line.substring(0, idx).trim(), line.substring(idx+1).trim() };
  }
  }
  /*/
  private static final String convUnicode(String s) {
  int idx = 0;
  int len = s.length();
  StringBuffer buf = new StringBuffer();
  try {
  while (idx < len) {
  char c = s.charAt(idx++);
  if (c == '\\') {
  c = s.charAt(idx++);
  if (c == 'u') {
  StringBuffer tmp = new StringBuffer(4);
  for (int i = 0; i < 4; i++) {
  tmp.append(s.charAt(idx++));
  }
  buf.append((char)Integer.parseInt(tmp.toString(), 16));
  } else {
  buf.append("\\"+c);
  }
  } else {
  buf.append(c);
  }
  }
  } catch (StringIndexOutOfBoundsException ex) {
  ;
  }
  return buf.toString();
  }
  private static final String rconvUnicode(String s) {
  StringBuffer buf = new StringBuffer();
  for (int i = 0; i < s.length(); i++) { char c = s.charAt(i);
  if ((int)c > 127) {
  buf.append("\\u"); String ss = Integer.toHexString((int)c); for (int j = 0; j < 4 - ss.length(); j++) { buf.append('0');
  }
  buf.append(ss);
  } else {
  buf.append(c);
  }
  }
  return buf.toString();
  }
  //*/
  }


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