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();
 }
}