http://stackoverflow.com/questions/2183503/substitute-values-in-a-string-with-placeholders-in-scala
本文所包含的代码不保证能编译通过
字符串替换问题
比如和谐，那就是说有一个字符串有些不和谐的词，希望得到一个和谐的字符串，得有个和谐的函数:

(String, List[String]) => String

或者把那些个不和谐的词放在更合适的集合里：

(String, IndexedSeq[String]) => String

大方向明确，工作分解，这个函数里面该做些什么呢？
基本上有三种方式：recursion, comprehension, folding

recursion
递归的思路比较直白，就是搞明白第一步怎么做，然后对剩下的数据重复进行第一步操作。那和谐的问题解决办法就是：
  1.替换第一个不和谐的词
  2.替换剩下那些个不和谐的词
COMPREHENSION
comprehension的基本概念就是利用函数A=>B把T[A]转化成T[B]，比如用函数String => Int，输入List[String]得到一个List[Int]，和谐的问题就是需要一个

(List[String], String => String) => String

帮我看看以下是什么错误（ibatis的）：

java.lang.ExceptionInInitializerError
Caused by: java.lang.RuntimeException: Error occurred.  Cause: com.ibatis.common.xml.NodeletException: Error parsing XML.  Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/sqlMap'.  Cause: com.ibatis.common.xml.NodeletException: Error parsing XML.  Cause: org.xml.sax.SAXParseException: Document root element "SqlMap", must match DOCTYPE root "sqlMapConfig".
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:49)
at com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(SqlMapClientBuilder.java:63)
at com.itcast.IStudentDAOmpl.<clinit>(IStudentDAOmpl.java:19)
Caused by: com.ibatis.common.xml.NodeletException: Error parsing XML.  Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/sqlMap'.  Cause: com.ibatis.common.xml.NodeletException: Error parsing XML.  Cause: org.xml.sax.SAXParseException: Document root element "SqlMap", must match DOCTYPE root "sqlMapConfig".
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:53)
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:46)
... 2 more
Caused by: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/sqlMap'.  Cause: com.ibatis.common.xml.NodeletException: Error parsing XML.  Cause: org.xml.sax.SAXParseException: Document root element "SqlMap", must match DOCTYPE root "sqlMapConfig".
at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:123)
at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:84)
at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:102)
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:72)
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:51)
... 3 more
Caused by: com.ibatis.common.xml.NodeletException: Error parsing XML.  Cause: org.xml.sax.SAXParseException: Document root element "SqlMap", must match DOCTYPE root "sqlMapConfig".
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:53)
at com.ibatis.sqlmap.engine.builder.xml.SqlMapParser.parse(SqlMapParser.java:40)
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser$10.process(SqlMapConfigParser.java:270)
at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:121)
... 7 more
Caused by: org.xml.sax.SAXParseException: Document root element "SqlMap", must match DOCTYPE root "sqlMapConfig".
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:236)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:172)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:382)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:316)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.rootElementSpecified(XMLDTDValidator.java:1652)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleStartElement(XMLDTDValidator.java:1931)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElement(XMLDTDValidator.java:795)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:878)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(XMLDocumentScannerImpl.java:1157)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1794)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:250)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292)
at com.ibatis.common.xml.NodeletParser.createDocument(NodeletParser.java:157)
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:50)
... 10 more
Exception in thread "main"