Summary of 6 basic usages of @requestmapping in Spring MVC

1) Most basic, method-level applications, such as:    java code   @RequestMapping (value= "/departments")  public String Simplepattern () {     System.out.println ("Simplepattern method was called");    return " Someresult ";    }       When you visit Http://localhost/xxxx/departments, the Simplepattern method is called    2) Parameter binding    java code   @RequestMapping (value= "/departments")  public String finddepatment (   @RequestParam ("DepartmentID") String DepartmentID) {         System.out.println ("Find Department with ID:" + DepartmentID);      return "Someresult";    }        forms such as this Access form:     /departments?departmentid= 23 can trigger access to the Finddepatment method   3 Rest-style parameters    java code   @RequestMapping (value= "/ Departments/{departmentid} ")  public string finddepatment (@PathVariable string departmentid) { &NBsp;   System.out.println ("Find Department with ID:" + DepartmentID);    return "Someresult";    }       as a restful address, such as:  /DEPARTMENTS/23, which is used (@ Pathvariable receive rest-style parameters   4 Rest-style parameter binding form 2     See example First, this is somewhat like before:  java code  @ Requestmapping (value= "/departments/{departmentid}")  public String finddepatmentalternative (   @ Pathvariable ("DepartmentID") String Somedepartmentid) {       System.out.println ("Find Department with ID: "+ Somedepartmentid);      return "Someresult";   &NBSP,}        This is a bit different, is to receive a form like/DEPARTMENTS/23 URL access, the 23 as an incoming Departmetnid, But in the actual method finddepatmentalternative, use the   @PathVariable ("DepartmentID") String Somedepartmentid to bind it to   Somedepartmentid, so here Somedepartmentid the 23  5 URL to bind multiple Id  java codes   @RequestMapping (value = "/departments/{departmentid}/employees/{employeeid} ")  public string Findemployee (   @PathVariable string DepartmentID,    @PathVariable string E Mployeeid) {       System.out.println ("Find Employee with ID:" + employeeId +   &nbsp ;     "from department:" + DepartmentID);      return "Someresult";   &NBSP,        This is actually better understood.   6 supports regular Expressions    java code   @RequestMapping (value= "/{textualpart:[a-z-]+}.{ numericpart:[\\d]+} ")  public string RegularExpression (   @PathVariable string Textualpart,     @PathVariable String Numericpart) {       System.out.println ("Textual part:" + Textualpart +         ", Numeric part:" + Numericpart);      return "Someresult"; &NBSP,}        For example url:/sometext.123, output:  textual part:sometext, Numeric part:123.