JAVA对特殊的字符串进行html编码

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/**
 * Created by Administrator on 2016/9/22.
 */
public class HtmlEncode {
    public String HtmlEncode(String str) {
        int length = str.length();
        int newLength = length;
        boolean someCharacterEscaped = false;
        for (int i = 0; i < length; i++) {
            char c = str.charAt(i);
            int cint = 0xffff & c;
            if (cint < 32)
                switch (c) {
                    case 11:
                    default:
                        newLength--;
                        someCharacterEscaped = true;
                        break;

                    case '\t':
                    case '\n':
                    case '\f':
                    case '\r':
                        break;
                }
            else
                switch (c) {
                    case '"':
                        newLength += 5;
                        someCharacterEscaped = true;
                        break;

                    case '&':
                    case '\'':
                        newLength += 4;
                        someCharacterEscaped = true;
                        break;

                    case '<':
                    case '>':
                        newLength += 3;
                        someCharacterEscaped = true;
                        break;
                }
        }
        if (!someCharacterEscaped)
            return str;

        StringBuffer sb = new StringBuffer(newLength);
        for (int i = 0; i < length; i++) {
            char c = str.charAt(i);
            int cint = 0xffff & c;
            if (cint < 32)
                switch (c) {
                    case '\t':
                    case '\n':
                    case '\f':
                    case '\r':
                        sb.append(c);
                        break;
                }
            else
                switch (c) {
                    case '"':
                        sb.append("&quot;");
                        break;

                    case '\'':
                        sb.append("&apos;");
                        break;

                    case '&':
                        sb.append("&amp;");
                        break;

                    case '<':
                        sb.append("&lt;");
                        break;

                    case '>':
                        sb.append("&gt;");
                        break;

                    default:
                        sb.append(c);
                        break;
                }
        }
        return sb.toString();
    }
}