Spring MVC Controller to accept the request of the way and write request processing method

Controller accepted common method request parameters:

1, to accept the request by Bean parameters:

Create a POJO entity class

Create pojo package entity classes and create UserForm in the packet, the code:

package pojo;
public class UserForm {
    private String uname;//与请求参数名称相同
    private String upass;
    private String reupass;
    public String getUname() {
        return uname;
    }
    public void setUname(String uname) {
        this.uname = uname;
    }
    public String getUpass() {
        return upass;
    }
    public void setUpass(String upass) {
        this.upass = upass;
    }
    public String getReupass() {
        return reupass;
    }
    public void setReupass(String reupass) {
        this.reupass = reupass;
    }
}

Create a controller class, and create a controller class IndexController UserController in the controller package

Wherein the role of the individual plain @RequestMapping annotation is to be understood that the method or class annotated with a "path" name to find when HTML, JSP (view) sends a request to the controller.

IndexController Code:

package controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller//在这里@Controller相当于@Controller（“indexController”）
@RequestMapping("/index")
public class IndexController {
    @RequestMapping("/login")
    public String login() {
        return "login";//跳转到“/WEB-INF/jsp/login.jsp”
    }
    @RequestMapping("/register")
    public String register() {
        return "register";
    }
}

UserController Code:

package controller;
import javax.servlet.http.HttpSession;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import pojo.UserForm;
import service.UserService;
@Controller//在这里@Controller相当于@Controller（“userController”）
@RequestMapping ( "/ User" )
 public  class the UserController {
     // get a log object is used, when a print information such that the information can be printed mark that class 
    Private  static  Final the Log Logger = LogFactory.getLog (the UserController. Class );
     // service dependency injection property to that userService 
    @Autowired
      public UserService that userService;
     / ** 
     * log processing 
     * / 
    @RequestMapping ( "/ Login" )
     public String Login (the UserForm User, the HttpSession the session, the Model Model) {
         IF (that userService .login (User)) { 
            session.setAttribute ( "U", User); 
            logger.info ( "Success" );
             return "main"; // login is successful, jump to main.jsp 
        } the else { 
            logger.info ( "failure" ); 
            model.addAttribute ( "MessageError", " username or password error " );
             return " Login " ; 
        }     
    } 
    / ** 
     * registration processing 
     * / 
    @RequestMapping ( " / Register " )
     public String Register (@ModelAttribute (" user " ) the UserForm user) {
         IF  (that userService.register(user)){
            Logger.info ( "success");
             Return "Login"; // registration is successful, jump to the login.jsp 
        } the else { 
            logger.info ( "failure" );
             // Use @ModelAttribute ( "user") and model.addAttribute ( "user", user ) the same function
           // use EL expression $ {user.uname} is taken ModelAttribute register.jsp uname values on page 
            return "Register"; // return register.jsp 
        } 
    } 
}

Create a page view, with a view to better understanding @RequestMapping notes the role which this knowledge about the content of the core code <body> tag:

Creating register.jsp Code:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style type="text/css">
    .textSize{
        width: 100pt ; 
        height : 15Pt
     } 
</ style > 
< title > registration screen </ title > 
< Script type = "text / JavaScript" > 
    // registration check entry 
    function allIsNull () {
         var name = document.registForm.uname .Value;
         var pwd = document.registForm.upass.value;
         var repwd = document.registForm.reupass.value;
         IF (name == "" ) {
            Alert ( " Please enter the name! " ); 
            document.registForm.uname.focus (); 
            return  to false ; 
        } 
        IF (pwd == "" ) { 
            Alert ( " Please enter your password! " ); 
            document.registForm.upass.focus (); 
            return  to false ; 
        } 
        IF (repwd == "" ) { 
            Alert ( " Please enter the confirmation password! " ); 
            document.registForm.reupass.focus (); 
            return  to false ; 
        } 
        IF(pwd!=repwd){
            alert("2次密码不一致，请重新输入！");
            document.registForm.upass.value="";
            document.registForm.reupass.value="";
            document.registForm.upass.focus();
            return false;
        }
        document.registForm.submit();
        return true;
    }
</script>
</head>
<body>
    <form action="${pageContext.request.contextPath }/user/register" method="post" name="registForm">
        <table 
        border=1 
        bgcolor="lightblue" 
        align="center">
            <tr>
                <td>姓名：</td>
                <td>
                    <input class="textSize" type="text" name="uname" value="${user.uname }"/>
                </td>
            </tr>
            
            <tr>
                <td>密码：</td>
                <td><input class="textSize" type="password" maxlength="20" name="upass"/></td>
            </tr>
            
            <tr>
                <td>确认密码：</td>
                <td><input class="textSize" type="password" maxlength="20" name="reupass"/></td>
            </tr>
            
            <tr>
                <td colspan="2" align="center"><input type="button" value="注册" onclick="allIsNull()"/></td>
            </tr>
        </table>
    </form>
</body>
</html>

Creating login.jsp Code:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
  <head>  
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>后台登录</title>
    <style type="text/css">
    table{
        text-align: center;
    }
    .textSize{
        width: 120px;
        height: 25px;
    }
    * {
        margin: 0px;
        padding: 0px;
    }
    body {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 12px;
        margin: 10px 10px auto;
        background-image: url(${pageContext.request.contextPath }/images/bb.jpg);
    }
    </style>
    <script type="text/javascript">
    //确定按钮
    function gogo(){
        document.forms[0].submit();
    }
    //取消按钮
    function cancel(){
        document.forms[0].action = "";
    }
    </script>
  </head>
  <body>
      <form action="${pageContext.request.contextPath }/user/login" method="post">
    <table>
        <tr>
            <td colspan="2"><img src="${pageContext.request.contextPath }/images/login.gif"></td>
        </tr>
        <tr>
            <td>姓名：</td>
            <td><input type="text" name="uname" class="textSize"></td>
        </tr>
        <tr>
            <td>密码：</td>
            <td><input type="password" name="upass" class="textSize"></td>
        </tr>
        <tr>
            <td colspan="2">
                <input type="image" src="${pageContext.request.contextPath }/images/ok.gif" onclick="gogo()" >
                <input type="image" src="${pageContext.request.contextPath }/images/cancel.gif" onclick="cancel()" >
            </td>
        </tr>
    </table>
    ${messageError }
    </form>
  </body>
</html>

2, by forming the processing method of receiving a request parameter reference

UserConttroller control register method is about the class code changes as follows:

@RequestMapping ( "/ Register" )
 / ** 
* requests received by the count parameter parameter parameter parameter name identical to the name of the request 
* / 
    public String Register (the uname String, String uPASS, the Model Model) {
         IF (that userService. the equals (the uname) && userService.equals (uPASS)) { 
            logger.info ( "success" );
             return "Login"; // registration is successful, jump to the login.jsp 
        } the else { 
            logger.info ( "failure" );
             return "Register"; // return register.jsp 
        } 
    }

3, accepting the request by HttpServetRequest parameter (recommended):

UserConttroller control register method is about the class code changes as follows:

    @RequestMapping("/register")
    public String register(HttpServletRequest request，Model model) {
               String uname = request.getParameter("uname");
               String upass = request.getParameter("upass");
        if(userService.equals(uname)&&userService.equals(upass)){
            logger.info("成功");
            return "login";//注册成功，跳转到login.jsp
        }else{
            logger.info("失败");
            return "register";return register.jsp//
        }
    }

Other @ PathVariable, @ RequestParam and so much to say, the same principle.

Spring MVC Controller to accept the request of the way and write request processing method

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