java特殊字符转换

package yzz;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringTools
{
    /**
     * 将字符转义成html格式
     * 
     * @param str
     *            字符串
     * @return 转换后的html
     */
    public static String htmlLableExe(String str)
    {
        str = stringReplace(str, "<", "<");
        str = stringReplace(str, ">", ">");
        str = stringReplace(str, "&", "&");
        return str;
    }

    /**
     * 将html转义成字符格式
     * 
     * @param str
     *            源字符串
     * @return 转换后的字符
     */
    public static String charLableExe(String str)
    {
        str = stringReplace(str, "&", "&");
        str = stringReplace(str, "<", "<");
        str = stringReplace(str, ">", ">");
        return str;
    }

    /**
     * 字符串转义特殊处理
     * 
     * @param str
     *            源字符串
     * @param sr
     *            替换成哪个字符
     * @param sdz
     *            需要替换的字符
     * @return 目标字符串
     */
    public static String stringReplace(String str, String sr, String sd)
    {
        String regEx = sr;
        Pattern p = Pattern.compile(regEx, Pattern.CASE_INSENSITIVE);
        Matcher m = p.matcher(str);
        str = m.replaceAll(sd);
        return str;
    }

    /**
     * 判断是否存在特殊字符
     * 
     * @param str
     *            源字符串
     * @return false存在,true校验通过
     */
    public static boolean htmlContains(String str)
    {
        if (str.contains("<") || str.contains(">") || str.contains("&"))
        {
            return false;
        }
        return true;
    }

    public static void main(String[] args)
    {
        String charlab = "y&z<z>";
        String htmllab = "y&z<z>";
        String htmls = StringTools.htmlLableExe(charlab);
        String chars = StringTools.charLableExe(htmllab);
        System.out.println(htmls);
        System.out.println(chars);
        System.out.println(htmlContains("<"));
    }
}