java去掉文本中多余的空格与空行实例代码

 /**
 * 移除多余空行和空格
 */
 public static String dealRedundantSpaceAndBlankLine(String content)
 {
  if (content == null || content.length() == 0)
  {
   return "";
  }
  StringBuilder strAfterRemoveCRSB = new StringBuilder();
  for (int i = 0; i < content.length(); i++)
  {
   if (content.charAt(i) != '\r')
    strAfterRemoveCRSB.append(content.charAt(i));
  }
  String strAfterRemoveCR = strAfterRemoveCRSB.toString();
  if (strAfterRemoveCR == null || strAfterRemoveCR.length() == 0)
  {
   return "";
  }
  StringBuilder resultSB = new StringBuilder();
  String[] lines = strAfterRemoveCR.split("\n");
  int blankCount = 0;
  for (String line : lines)
  {
   if (line == null)
   {
    continue;
   }
   String lineTrim = line.trim();
   if ("".equals(lineTrim))
   {
    blankCount++;
    if (blankCount <= 2) {
     resultSB.append("\n");
    }
   } else {
    blankCount = 0;
    resultSB.append(dealSpace4OneLine(line)).append("\n");
   }
  }
  resultSB.deleteCharAt(resultSB.length() - 1);
  return resultSB.toString();
 }

 /**
 * 移除1行中的多余空格
 */
 public static String dealSpace4OneLine(String line)
 {
  if (line == null || "".equals(line)) {
   return "";
  }
  int spaceCount = 0;
  StringBuilder sb = new StringBuilder();
  for (int i = 0; i < line.length(); i++) {
   char curChar = line.charAt(i);
   if (curChar == ' ')
   {
    spaceCount++;
    if (spaceCount <= 5) {
     sb.append(' ');
    }
   } else {
    spaceCount = 0;
    sb.append(curChar);
   }
  }
  return sb.toString();
 }

 public static void main(String[] args) {
  String str = "呵呵  测试\n\n\n\n   \n \r\n将风控打扫房  间\n\n\n\n \n \n  快递费解封时代峰峻\n\r\n 发的几点睡 ";
  String result = dealRedundantSpaceAndBlankLine(str);
  System.out.println(result);
 }