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给大家贡献一个Properties类

摘要: 给大家贡献一个Properties类

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[本文章最后由 rocks 在2006-02-28 10:06:52编辑过]

http:///tech/article695.html
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。

[]<table cellpadding=0 cellspacing=0 width=94% bgcolor=#000000 align=center style='table-layout:fixed'><tr><td><table width=100% cellpadding=5 cellspacing=1 style='table-layout:fixed'><tr><td bgcolor=#FFFFFF style='left: 0px; width: 100%; word-wrap: break-word'>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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