去掉字符串中的空格、换行等符号

    /**
     * 
     * @param target 需处理的字符串
     * @param size 指定长度
     * @param insert 插入的字符
     * @return
     */
public static String collapseString(String target, int size, String insert){  

        if(StringUtils.isEmpty(target)) return null; //目标字符串为空，返回目标字符串  

        Pattern p = Pattern.compile("\\s*|\t|\r|\n");      
        Matcher m = p.matcher(target);      
        target = m.replaceAll("");

        int target_length = target.length();  

        if(target_length <= size) return target; //目标字符串长度等于间隔长度 ， 返回目标字符串  

        insert = StringUtils.isEmpty(insert) ? "<br/>" : insert;  

        //插入次数  
        int times = 0;  
        if(target_length % size == 0){  
            times = target_length / size - 1;  
        }else{  
            times = target_length / size;  
        }  

        //结果字符集  
        char [] result_chars = new char[target_length + times];  

        //目标字符集  
        char [] target_chars = new char[target_length];  

        //将字符串数据装入目标字符集  
        target.getChars(0, target_length, target_chars, 0);  

        //遍历目标字符集，将值插入到结果字符集  
        int j = 0;  
        for(int i = 0; i < target_chars.length; i++){  

            //间隔处插入值  
            if(i > 0 && i % size == 0){  
                result_chars[j] = '`';  
                j = j + 1;  
            }  

            result_chars[j] = target_chars[i];  
            j = j + 1;  
        }  

        String resultStr = new String(result_chars);  
        return resultStr.replaceAll("`", insert);
    }