小编zam*_*eer的帖子

我有 spring MVC 应用程序，我已经实现了注销功能，但它不起作用。当用户登录时，我通过设置属性在会话内将用户登录详细信息维护为 bean“UserDTO”，当用户单击注销超链接时，然后在注销功能内，我通过获取会话使会话无效请求范围。这是代码。

  @RequestMapping(value="/SignOut",method = RequestMethod.GET) 
    public String signOut(HttpServletRequest request){
           HttpSession session=request.getSession(); 
 System.out.println("session id before invalidating it:"+session.getId());
          UserDTO userDTO=(UserDTO)session.getAttribute("UserDTO");
          System.out.println("userDTO obje"+userDTO.getFirst_name());
          session.removeAttribute("UserDTO");   
    session.invalidate(); 
System.out.println("session id after invalidating session is:"+session.getId()); 
}

在使会话会话 ID 无效之前，我得到相同的会话 ID ：8E8AE156B9AE963C9C2E9BCB0B9B13DB 会话无效后会话 ID 是：8E8AE156B9AE963C9C2E9BCB0B9B13DB

Feb 09, 2016 1:02:45 PM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'userDTO' available as request attribute
    at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:141)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:179)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:199)
    at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:165)
    at …

我用来分割任意数量的空格的字符串的代码是

String out="SELECT * FROM EMP WHERE EMPID=10";
String array[] = out.split("\\s+");

我希望将"out"字符串中的空格包含到array []对象中,同时使用空格分割.我想要的输出是:

array[]={"SELECT","[WHITE SPACE]","*","[WHITE SPACE]","FROM","[WHITE SPACE]","EMP","[WHITE SPACE]","WHERE","[WHITE SPACE]","EMPID=10"}

但我得到的输出是:

 array[]={"SELECT","*","FROM","EMP","WHERE","EMPID=10"}

任何帮助将不胜感激