用JAVA实现UBB代码

      相信大家一定可以想到UBB代码的解析，其实就是将“[b][/b]”这样的格式转换成““”就可以了，但是怎么转换呢？答案是用正则表达式。利用上一期讲到的正则表达式类(sony.utils.Regex)中的eregi_replace替换方法，可以很轻松地做到。下面是一段示例。
　　String s="[b]这是粗体[/b]";
　　String result;
　　result = Regex.eregi_replace("[b](.+?)[/b]","“$1“", s);
　　System.out.println(result);
　　//打印结果是：
　　//“这是粗体“。
这么简单吗？是的，我们只需要将其它的UBB Tag作类似的替换就实现了UBB代码的解析了。
下面给出一个UBB类.

/***************************UbbCode.java****************************************/
import java.util.regex.Matcher; //导入所需要的类
import java.util.regex.Pattern;
public class UbbCode //类定义
{
private String source; //待转化的HTML代码字符串
private String ubbTags[]; //UBB标记数组
private String htmlTags[]; //HTML标记数组

//初始化,分别为UBB标记数组和HTML标记数组赋值
public UbbCode()
{
byte byte0 = 74;
source = new String();
ubbTags = new String[byte0];
htmlTags = new String[byte0];
ubbTags[0] = "[b]";
htmlTags[0] = "<b>";
ubbTags[1] = "[/b]";
htmlTags[1] = "</b>";
ubbTags[2] = "[i]";
htmlTags[2] = "<em>";
ubbTags[3] = "[/i]";
htmlTags[3] = "</em>";
ubbTags[4] = "[quote]";
htmlTags[4] = "<div style=\"border-style:dashed;background-color:#CCCCCC;border-width:thin;border-color:#999999\"><br><em>";
ubbTags[5] = "[/quote]";
htmlTags[5] = "</em><br><br></div>";
ubbTags[6] = "[/size]";
htmlTags[6] = "</font>";
ubbTags[7] = "[size=6]";
htmlTags[7] = "<font style=\"font-size:6px\">";
ubbTags[8] = "[size=8]";
htmlTags[8] = "<font style=\"font-size:8px\">";
ubbTags[9] = "[size=10]";
htmlTags[9] = "<font style=\"font-size:10px\">";
ubbTags[10] = "[size=12]";
htmlTags[10] = "<font style=\"font-size:12px\">";
ubbTags[11] = "[size=14]";
htmlTags[11] = "<font style=\"font-size:14px\">";
ubbTags[12] = "[size=18]";
htmlTags[12] = "<font style=\"font-size:18px\">";
ubbTags[13] = "[size=24]";
htmlTags[13] = "<font style=\"font-size:24px\">";
ubbTags[14] = "[size=36]";
htmlTags[14] = "<font style=\"font-size:36px\">";

//字体
ubbTags[15] = "[/font]";
htmlTags[15] = "</font>";
ubbTags[16] = "[font=Arial]";
htmlTags[16] = "<font face=\"Arial\">";
ubbTags[17] = "[font=Arial Black]";
htmlTags[17] = "<font face=\"Arial Black\">";
ubbTags[18] = "[font=Verdana]";
htmlTags[18] = "<font face=\"Verdana\">";
ubbTags[19] = "[font=Times New Roman]";
htmlTags[19] = "<font face=\"Times New Roman\">";
ubbTags[20] = "[font=Garamond]";
htmlTags[20] = "<font face=\"Garamond\">";
ubbTags[21] = "[font=Courier New]";
htmlTags[21] = "<font face=\"Courier New\">";
ubbTags[22] = "[font=Webdings]";
htmlTags[22] = "<font face=\"Webdings\">";
ubbTags[23] = "[font=Wingdings]";
htmlTags[23] = "<font face=\"Wingdings\">";
ubbTags[24] = "[font=隶书]";
htmlTags[24] = "<font face=\"隶书\">";
ubbTags[25] = "[font=幼圆]";
htmlTags[25] = "<font face=\"幼圆\">";
ubbTags[26] = "[font=方正舒体]";
htmlTags[26] = "<font face=\"方正舒体\">";
ubbTags[27] = "[font=方正姚体]";
htmlTags[27] = "<font face=\"方正姚体\">";
ubbTags[28] = "[font=仿宋_GB2312]";
htmlTags[28] = "<font face=\"仿宋_GB2312\">";
ubbTags[29] = "[font=黑体]";
htmlTags[29] = "<font face=\"黑体\">";
ubbTags[30] = "[font=华文彩云]";
htmlTags[30] = "<font face=\"华文彩云\">";
ubbTags[31] = "[font=华文细黑]";
htmlTags[31] = "<font face=\"华文细黑\">";
ubbTags[32] = "[font=华文新魏]";
htmlTags[32] = "<font face=\"华文新魏\">";
ubbTags[33] = "[font=华文中宋]";
htmlTags[33] = "<font face=\"华文中宋\">";
ubbTags[34] = "[font=华文行楷]";
htmlTags[34] = "<font face=\"华文行楷\">";
ubbTags[35] = "[font=楷体_GB2312]";
htmlTags[35] = "<font face=\"楷体_GB2312\">";
ubbTags[36] = "[font=隶书]";
htmlTags[36] = "<font face=\"隶书\">";
ubbTags[37] = "[font=华文楷体]";
htmlTags[37] = "<font face=\"华文楷体\">";
ubbTags[38] = "[font=宋体]";
htmlTags[38] = "<font face=\"宋体\">";
ubbTags[39] = "[font=新宋体";
htmlTags[39] = "<font face=\"新宋体\">";
ubbTags[40] = "[font=幼圆";
htmlTags[40] = "<font face=\"幼圆\">";

//字体颜色
ubbTags[41] = "[red]";
htmlTags[41] = "<font color=\"red\">";
ubbTags[42] = "[/red]";
htmlTags[42] = "</font>";
ubbTags[43] = "[blue]";
htmlTags[43] = "<font color=\"blue\">";
ubbTags[44] = "[/blue]";
htmlTags[44] = "</font>";
ubbTags[45] = "[yellow]";
htmlTags[45] = "<font color=\"yellow\">";
ubbTags[46] = "[/yellow]";
htmlTags[46] = "</font>";
ubbTags[47] = "[green]";
htmlTags[47] = "<font color=\"green\">";
ubbTags[48] = "[/green]";
htmlTags[48] = "</font>";

ubbTags[49] = "[f]";
htmlTags[49] = "<marquee width=\"400\" scrolldelay=\"30\" scrollamount=\"1\" onmouseover=\"this.stop()\" onmouseout=\"this.start()\">";

//标题
ubbTags[50] = "[h1]";
htmlTags[50] = "<h1>";
ubbTags[51] = "[/h1]";
htmlTags[51] = "</h1>";
ubbTags[52] = "[h2]";
htmlTags[52] = "<h2>";
ubbTags[53] = "[/h2]";
htmlTags[53] = "</h2>";
ubbTags[54] = "[h3]";
htmlTags[54] = "<h3>";
ubbTags[55] = "[/h3]";
htmlTags[55] = "</h3>";
ubbTags[56] = "[h4]";
htmlTags[56] = "<h4>";
ubbTags[57] = "[/h4]";
htmlTags[57] = "</h4>";
ubbTags[58] = "[h5]";
htmlTags[58] = "<h5>";
ubbTags[59] = "[/h5]";
htmlTags[59] = "</h5>";
ubbTags[60] = "[h6]";
htmlTags[60] = "<h6>";
ubbTags[61] = "[/h6]";
htmlTags[61] = "</h6>";
ubbTags[62] = "[hr]";
htmlTags[62] = "<hr>";
ubbTags[63] = "[img]";
htmlTags[63] = "<br><img src=\"";
ubbTags[64] = "[/img]";
htmlTags[64] = "\"><br>";
ubbTags[65] = "[center]";
htmlTags[65] = "<div align=\"center\">";
ubbTags[66] = "[/center]";
htmlTags[66] = "</div>";

ubbTags[67] = "[/f]";
htmlTags[67] = "</marquee>";
ubbTags[68] = "[left]";
htmlTags[68] = "<div align=\"left\">";
ubbTags[69] = "[/left]";
htmlTags[69] = "</div>";
ubbTags[70] = "[right]";
htmlTags[70] = "<div align=\"right\">";
ubbTags[71] = "[/right]";
htmlTags[71] = "</div>";
ubbTags[72] = "[u]";
htmlTags[72] = "<u>";
ubbTags[73] = "[/u]";
htmlTags[73] = "</u>";

}

private String replace(String s, String s1, String s2) {
  StringBuffer stringbuffer = new StringBuffer();
  for(int i = 0; i < s1.length(); i++) {
  char c = s1.charAt(i);
  switch(c) {
   case 91: // '['
    stringbuffer.append("\\[");
    break;

   case 93: // ']'
     stringbuffer.append("\\]");
     break;

   default:
     stringbuffer.append(c);
     break;
   }
}

Pattern pattern = Pattern.compile(stringbuffer.toString());
Matcher matcher = pattern.matcher(s);
StringBuffer stringbuffer1 = new StringBuffer();
for(boolean flag = matcher.find(); flag; flag = matcher.find())
matcher.appendReplacement(stringbuffer1, s2);

return matcher.appendTail(stringbuffer1).toString();
}

private String replaceNormalUBBCode(String s)
{
String s1 = new String(s);
for(int i = 0; i < ubbTags.length; i++)
s1 = replace(s1, ubbTags[i], htmlTags[i]);

return s1;
}

private String replaceURL(String s)
{
StringBuffer stringbuffer = new StringBuffer(s);
String s1 = new String();
int i = s.indexOf("[url]");
int j = s.indexOf("[/url]");
if(i != -1 && j != -1 && i < j)
{
String s2 = s.substring(i + 5, j);
String s3 = "<a href=\"" + s2 + "\">" + s2 + "</a>";
stringbuffer.replace(i, j + 6, s3);
}
return stringbuffer.toString();
}

private String replaceEmail(String s)
{
StringBuffer stringbuffer = new StringBuffer(s);
String s1 = new String();
int i = s.indexOf("[email]");
int j = s.indexOf("[/email]");
if(i != -1 && j != -1 && i < j)
{
String s2 = s.substring(i + 7, j);
String s3 = "<a href=\"mailto:" + s2 + "\">" + s2 + "</a>";
stringbuffer.replace(i, j + 8, s3);
}
return stringbuffer.toString();
}

public void setSource(String s)
{
source = s;
}

public String getResult()
{
return source;
}

public void run()
{
for(source = replaceNormalUBBCode(source); source.indexOf("[url]") != -1 && source.indexOf("[/url]") != -1;
  source = replaceURL(source));
for(; source.indexOf("[email]") != -1 && source.indexOf("[/email]") != -1; source = replaceEmail(source));
}
}

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