Ajax Post submits the controller to the SPRINGMVC and passes the processing results to the foreground output summary (6)--Several ways for the SPRINGMVC controller to get the parameters

Reference: http://www.cnblogs.com/xiaoxi/p/5695783.html

1, directly the parameter of the form is written in the parameters of the controller corresponding method, applicable to the Get method submission, not for post mode submission.

    /**     * 1. Write the parameters of the form directly in the parameter of the controller corresponding method      * @param username     * @param password *     @return *    * * Requestmapping ("/adduser1") 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 through HttpServletRequest      * @param request     * @return     *    /@RequestMapping ("/adduser2")    Public String 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 the method can be.
(1) Create a bean corresponding to the parameters in the form

Package Demo.model;public class Usermodel {        private String username;    private String password;    Public String GetUserName () {        return username;    }    public void Setusername (String username) {        this.username = username;    }    Public String GetPassword () {        return password;    }    public void SetPassword (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. Get the parameters in the path by @pathvariable

    /**     * 4, get the parameters in the path through @pathvariable      * @param username     * @param password     *     @return    * * 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 @pathvariable annotations, that is, Username=lixiaoxi, password=111111 after the entry.
5. Use @modelattribute annotations to get the form form data for the POST request
The JSP forms are as follows:

<form action = "<%=request.getcontextpath ()%>/demo/adduser5" method= "POST" >      user name:&nbsp;< Input type= "text" name= "username"/><br/>     secret &nbsp;&nbsp; code: &nbsp;<input type= "Password" Name= "Password"/><br/>     <input type= "Submit" value= "Submit"/>      

The Java controller is as follows:

    /**     * 5, use the @modelattribute annotation 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 binding request parameters to the method into the parameter      * @param username     * @param password     * @return    * * Requestmapping (value= "/adduser6", method=requestmethod.get) public    String AddUser6 (@RequestParam ("username") String username, @RequestParam ("password") string password) {        System.out.println ("username is:" +username);        SYSTEM.OUT.PRINTLN ("Password is:" +password);        return "Demo/index";    }

Ajax Post submits the controller to the SPRINGMVC and passes the processing results to the foreground output summary (6)--Several ways for the SPRINGMVC controller to get the parameters