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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("""); break; case '\'': sb.append("'"); break; case '&': sb.append("&"); break; case '<': sb.append("<"); break; case '>': sb.append(">"); break; default: sb.append(c); break; } } return sb.toString(); } }