codefilter.java

本系统分两部分管理,前台用于文章发布和用户文章发表,后台有管理员审核和不同权限的用户管理,具有高稳定性和安全性。整个站的全部数据逻辑运算完全有beans封装, 具有界面简洁、功能强大、操作方便等特点。

package com.ntsky.common;

import java.io.*;
//定义一个类CodeFilter
public class CodeFilter{
	public CodeFilter(){
	}
	//特殊字符转为Html
	public static String toHtml(String s){
		if(s == null){
			s = "";
			return s;
		}
		s = Replace(s.trim(),"&","&");
        s = Replace(s.trim(),"<","&lt;");
		s = Replace(s.trim(),">","&gt;");
		s = Replace(s.trim(),"\t","    ");
		s = Replace(s.trim(),"\r\n","\n");
		s = Replace(s.trim(),"\n","<br>");
		s = Replace(s.trim(),"  "," &nbsp;");
		s = Replace(s.trim(),"'","&#39;");
		s = Replace(s.trim(),"\\","&#92;");
		return s;
    }
    /**
     * ubb
     */
    public static String toUbbHtml(String s){
        if(s == null){
            s = "";
            return s;
        }
        s = Replace(s,"\n","<br>");
        s = Replace(s,"  "," &nbsp;");
        s = Replace(s,"'","&#39;");
        s = Replace(s,"\\","&#92;");
        return s;
    }

	//逆
    public static String unHtml(String s){
		s = Replace(s,"<br>","\n");
		s = Replace(s,"&nbsp;"," ");
		return s;
  	}

  //Replace
   public static String Replace(String source,String oldString,String newString){

		StringBuffer output = new StringBuffer();

		int lengthOfsource = source.length();//源字符串长度
		int lengthOfold = oldString.length();//老字符串长度

		int posStart = 0;//开始搜索位置
		int pos;//搜索到的老字符串的位置

		//source.indexOf(oldString,posStart)检索某子串在字符串postStart以后第一次出现的位置,如果未找到就返回一个-1。
		while((pos = source.indexOf(oldString,posStart)) >= 0){//得到字符串的位置(eg:如果有<br>就执行，没有就跳出，不要处理。)

			//将以posStart起始以pos-1结束之间的内容拷贝到另一个字符串中。因为posStar从0开始的。
			output.append(source.substring(posStart,pos));//append方法将文本添加到当前StringBuffer对象内容的结尾。
			output.append(newString);//替换成新字符串

			posStart = pos + lengthOfold;//位置也变为找到了之后的位置,pos为得到第一次出现字符的位置，lengthold为字符的长度

		}

		if(posStart < lengthOfsource){
			//source.substring(posStart)以lengthOfsource开始的字符串拷贝到列一个字符串中
	        output.append(source.substring(posStart));
		}
		//这个方法将其内容转换成一个可以被用于输出的字符串对象。它允许操作对应的文本用于输出或数据存储。
		return output.toString();
   }
 }