项目中用到了js的输出加快页面的加载速度,由于是国际化的编码,所以,输出到js文件中的字符需要转换成是Unicode编码的。有很多的方法,其中有使用native2ascii.exe的等等,但是殊不知,java里面本来就是类似的方法,大家想一下,我们的 java.util.properties这个类吧。。是不是有思路了呢? 我们提起其中的方法就ok了。


private static final char[] hexDigit = { '0', '1', '2', '3', '4', '5', '6',
'7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
private static char toHex(int nibble) {
return hexDigit[(nibble & 0xF)];
}
/*
* Converts unicodes to encoded \uxxxx and escapes
* special characters with a preceding slash
*/
private String saveConvert(String theString, boolean escapeSpace) {
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
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)) {
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();

private static final char[] hexDigit = { &#39;0&#39;, &#39;1&#39;, &#39;2&#39;, &#39;3&#39;, &#39;4&#39;, &#39;5&#39;, &#39;6&#39;,&#39;7&#39;, &#39;8&#39;, &#39;9&#39;, &#39;A&#39;, &#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;, &#39;F&#39; }; private static char toHex(int nibble) {return hexDigit[(nibble &amp; 0xF)];}
/*&nbsp;* Converts unicodes to encoded \uxxxx and escapes&nbsp;* special characters with a preceding slash&nbsp;*/private String saveConvert(String theString, boolean escapeSpace) {int len = theString.length();int bufLen = len * 2;if (bufLen &lt; 0) {bufLen = Integer.MAX_VALUE;}StringBuffer outBuffer = new StringBuffer(bufLen); for(int x=0; x<len; achar="" avoids="" belowif="" block="" case="" char="" common="" handle="" largest="" selecting="" specials="" that="" the=""> 61) &amp;&amp; (aChar &lt; 127)) {if (aChar == &#39;\\&#39;) {outBuffer.append(&#39;\\&#39;); outBuffer.append(&#39;\\&#39;);continue;}outBuffer.append(aChar);continue;}switch(aChar) {case &#39; &#39;:if (x == 0 || escapeSpace)&nbsp;&nbsp;outBuffer.append(&#39;\\&#39;);outBuffer.append(&#39; &#39;);break;case &#39;\t&#39;:outBuffer.append(&#39;\\&#39;); outBuffer.append(&#39;t&#39;);break;case &#39;\n&#39;:outBuffer.append(&#39;\\&#39;); outBuffer.append(&#39;n&#39;);break;case &#39;\r&#39;:outBuffer.append(&#39;\\&#39;); outBuffer.append(&#39;r&#39;);break;case &#39;\f&#39;:outBuffer.append(&#39;\\&#39;); outBuffer.append(&#39;f&#39;);break;case &#39;=&#39;: // Fall throughcase &#39;:&#39;: // Fall throughcase &#39;#&#39;: // Fall throughcase &#39;!&#39;:outBuffer.append(&#39;\\&#39;); outBuffer.append(aChar);break;default:if ((aChar &lt; 0x0020) || (aChar &gt; 0x007e)) {outBuffer.append(&#39;\\&#39;);outBuffer.append(&#39;u&#39;);outBuffer.append(toHex((aChar &gt;&gt; 12) &amp; 0xF));outBuffer.append(toHex((aChar &gt;&gt;8) &amp; 0xF));outBuffer.append(toHex((aChar &gt;&gt;4) &amp; 0xF));outBuffer.append(toHex( aChar&amp; 0xF));} else {outBuffer.append(aChar);}}}return outBuffer.toString();

Properties.java 下载 Properties.rar

Share

   很久没有这么沉下心想技术方面的这些东西了,特别是java方面的,整理+证实弄了将近3个小时。

   说到session,首先不得不提到的是sessionid(有app容器通过特殊的算法生成的唯一标识),它是服务器端用来唯一标识一个客户端的key。通常来说可以理解成是一个浏览对象,直到这个容器关闭之前,所有生成的sessionid都是唯一的。

   app server一般通过3种方式推送这个key,即cookie、URL重写、和隐藏表单,后两种是类似的。如果是第一种,那么Sessionid被关联到一个浏览器实例周期的cookie里(即浏览器关闭,cookie就会失效),然后客户端浏览器每次用这个cookie来标示会话。通常这些都是Web容器替我们完成的。如果是URL重写,则每个请求字符串后面会被附加如jsessionid=1A076E73EA31EDD3E735F34256C245B8 这样的标识用来标识会话,当浏览器被设置成拒绝cookie的时候,一般都是采用第二种方式。

关于服务器的集群(以tomcat为例)继续阅读

Share