public static void main(String[] args) {  
        String reg="@.*?(?=[.,:;!?\\s#@。，：；！？])";  
        Pattern pattern=Pattern.compile(reg);  
        System.out.println(pattern.toString());  
        Matcher matcher=pattern.matcher("fsafaf加大@梵净山，金佛山@就佛网 杰弗里斯abc@sina.com fsla");  
        StringBuffer sb=new StringBuffer();  
        while(matcher.find()){  
            System.out.println(matcher.group());  
            matcher.appendReplacement(sb, "<a href='abc'>"+matcher.group()+"</a>");  
        }  
        matcher.appendTail(sb);  
        System.out.println(sb);  
    }

public static void main(String[] args) {
        String reg = "([a-zA-Z0-9-.]*)@(.*?)([,:;!?\\s#@。，：；！？]|$|\\.(?:com|org|net))";
        Pattern pattern = Pattern.compile(reg);
        System.out.println(pattern.toString());
        Matcher matcher = pattern
                .matcher("fsafaf加大@梵净山，金佛山@就佛网 杰弗里斯abc@sina.com fsla;@sina.com;ssd@sina");
        StringBuffer sb = new StringBuffer();
        while (matcher.find()) {
            String begin = matcher.group(1);
            String middle = matcher.group(2);
            String end = matcher.group(3);

            // 判断email
            if (!begin.equals("")) {
                boolean isEmail = middle.length() != 0;
                for (int i = 0; i < middle.length(); i++) {
                    if (!Character.isLetterOrDigit(middle.charAt(i))) {
                        isEmail = false;
                        break;
                    }
                }
                if (isEmail) {
                    if (end.length() > 1) {
                        //确认是email
                        continue;
                    }
                }
            }

            matcher.appendReplacement(sb, begin + "<a href='abc'>" + "@"
                    + middle + "</a>" + end);
        }
        matcher.appendTail(sb);
        System.out.println(sb);

    }