Receive different types of data in SPRINGMVC

1, directly writes the parameter in the controller corresponding method parameter, applies to the Get method, does not apply to the Post method

 /**   * 1. Directly write the parameters of the form in the formal parameter of the controller's corresponding method *   @param   username *   @param   password *   @return /span> */  @RequestMapping ( "/adduser1" Span style= "COLOR: #000000" >)  public   String AddUser1 (string username,string password) {System.out.println ( "username is:" +username);        SYSTEM.OUT.PRINTLN ( password is: "+password);     return  "Demo/index" ; }

URL form: The arguments submitted by http://localhost/SSMDemo/demo/addUser1?username=lixiaoxi&password=111111 need to match the name of the incoming parameter in the Controller method.

2, through the HttpServletRequest receive, the post way and get way can.

    /*** 2, receive via HttpServletRequest *@paramRequest *@return     */@RequestMapping ("/adduser2")     Publicstring AddUser2 (HttpServletRequest request) {string Username=request.getparameter ("username"); String Password=request.getparameter ("Password"); System.out.println ("Username is:" +username); System.out.println ("Password is:" +password); return"Demo/index"; }

3, through a bean to receive, post and get method can be

1. Create a Bean object corresponding to the form to get

 PackageDemo.model; Public classUsermodel {PrivateString username; PrivateString password;  PublicString GetUserName () {returnusername; }     Public voidSetusername (String username) { This. Username =username; }     PublicString GetPassword () {returnpassword; }     Public voidSetPassword (String password) { This. Password =password; }    }

2. Use this bean to encapsulate the received parameters

    /**      * 3, through a bean to receive       @param  user     @return     * /    @RequestMapping ("/adduser3")      Public String addUser3 (usermodel user) {        System.out.println ("username is:" +user.getusername ());        System.out.println ("password is:" +User.getpassword ());         return "Demo/index";    }

4. to get the parameters in the path by @pathvariable

 /**   * 4, get the parameters in the path by @pathvariable *  @param   username *   @param   password *   @return  Span style= "COLOR: #008000" >*/  @RequestMapping (value  = "/adduser4/{ Username}/{password} ", Method=requestmethod.get)  public   string addUser4 (@PathVariable string username, @PathVariable string password) {System        . OUT.PRINTLN ( username is: "+username);        SYSTEM.OUT.PRINTLN ( password is: "+password);     return  "Demo/index" ; }

For example, when accessing the http://localhost/SSMDemo/demo/addUser4/lixiaoxi/111111 path, the template variables {username} and {password} in the URL are automatically Bind to a parameter with the same name through the @pathvariable annotation, that is, after the entry Username=lixiaoxi, password=111111

5. use @modelattribute annotations to get the form form data for the POST request

<formAction= "<%=request.getcontextpath ()%>/demo/adduser5"Method= "POST">User name:&nbsp;<inputtype= "text"name= "User.username"/><BR/>Dense&nbsp;&nbsp;Code:&nbsp;<inputtype= "User.password"name= "Password"/><BR/>     <inputtype= "Submit"value= "Submit"/>      <inputtype= "Reset"value= "Reset"/> </form> 

The Java controller is as follows

    /**      * 5. Use @modelattribute annotations to get the      form form data for the POST request @param  user     @return     *    /@RequestMapping (Value= "/adduser5", method=requestmethod.post)      public String addUser5 (@ModelAttribute ("user") Usermodel user) {        System.out.println ( "username is:" +user.getusername ());        System.out.println ("password is:" +User.getpassword ());         return "Demo/index";    }

6. Binding request parameters to method @requestparam with annotations

An exception occurs when the request parameter username does not exist and can be resolved by setting the property Required=false, for example: @RequestParam (value= "username", Required=false)

    /*** 6, with annotations @requestparam bind request parameters to method entry *@paramusername *@paramPassword *@return     */@RequestMapping (Value= "/adduser6", method=requestmethod.get) PublicString AddUser6 (@RequestParam ("username") string username, @RequestParam ("Password") (String password) {System.out.println ("Username is:" +username); System.out.println ("Password is:" +password); return"Demo/index"; }

Originally from: https://www.cnblogs.com/xiaoxi/p/5695783.html

Receive different types of data in SPRINGMVC