decode Entities - Java java.lang

Java examples for java.lang:String HTML

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Description

decode Entities

Demo Code

/*/*from w w w  .  j a  v  a2 s.c  om*/
  You may freely copy, distribute, modify and use this class as long
  as the original author attribution remains intact.  See message
  below.

  Copyright (C) 2004 Christian Pesch. All Rights Reserved.
 */

//package com.java2s;
import java.util.HashMap;
import java.util.Map;

public class Main {
    public static void main(String[] argv) {
        String str = "java2s.com";
        System.out.println(decodeEntities(str));
    }

    private static final Map<String, String> entities = new HashMap<String, String>();

    public static String decodeEntities(String str) {
        StringBuilder builder = new StringBuilder();
        int semicolonIndex = 0;
        while (semicolonIndex < str.length()) {
            int ampersandIndex = str.indexOf("&", semicolonIndex);
            if (ampersandIndex == -1) {
                builder.append(str.substring(semicolonIndex, str.length()));
                break;
            }
            builder.append(str.substring(semicolonIndex, ampersandIndex));
            semicolonIndex = str.indexOf(";", ampersandIndex);
            if (semicolonIndex == -1) {
                builder.append(str.substring(ampersandIndex, str.length()));
                break;
            }

            String tok = str.substring(ampersandIndex + 1, semicolonIndex);
            if (tok.charAt(0) == '#') {
                tok = tok.substring(1);
                try {
                    int radix = 10;
                    if (tok.trim().charAt(0) == 'x') {
                        radix = 16;
                        tok = tok.substring(1, tok.length());
                    }
                    builder.append((char) Integer.parseInt(tok, radix));
                } catch (NumberFormatException exp) {
                    builder.append('?');
                }
            } else {
                tok = entities.get(tok);
                if (tok != null)
                    builder.append(tok);
                else
                    builder.append('?');
            }
            semicolonIndex++;
        }
        return builder.toString();
    }

    public static String trim(String string) {
        if (string == null)
            return null;
        StringBuffer buffer = new StringBuffer(string);
        for (int i = 0; i < buffer.length(); i++) {
            char c = buffer.charAt(i);
            if (Character.isWhitespace(c))
                buffer.setCharAt(i, ' ');
        }
        return buffer.toString().trim();
    }
}

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