本文共 4051 字，大约阅读时间需要 13 分钟。

SpringMVC系列教程——04命令控制器讲解

本讲我们使用一个用户添加的案例来演示。

一.准备工作

首先我们创建一个jsp页面addUser.jsp(如果对下面的action内容不懂请参见):

<%--  Created by IntelliJ IDEA.  User: Administrator  Date: 2020/7/29  Time: 23:08  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %>    
   
        用户名:
    
    
    密码:
    
    
    性别:
    
    
    生日:
    
    
    
    
   

然后我们创建一个控制器UserAddController:

package web.Controller;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.Controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class UserAddController implements Controller {
       @Override    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
           ModelAndView mav = new ModelAndView("user/addUser");        return mav;    }}

DispatcherServlet-servlet.xml文件内容为:

接下来我们访问:http://localhost:8080/userAddController.do

package web.model;public class User {
       private String name;    private String password;    private String gender;    private String birthday;    public User(){
       }    @Override    public String toString() {
           return "User{" +                "name='" + name + '\'' +                ", password='" + password + '\'' +                ", gender='" + gender + '\'' +                ", birthday='" + birthday + '\'' +                '}';    }        public String getName() {
           return name;    }    public void setName(String name) {
           this.name = name;    }    public String getPassword() {
           return password;    }    public void setPassword(String password) {
           this.password = password;    }    public String getGender() {
           return gender;    }    public void setGender(String gender) {
           this.gender = gender;    }    public String getBirthday() {
           return birthday;    }    public void setBirthday(String birthday) {
           this.birthday = birthday;    }}

二.演示

根据前面的addUser.jsp可知:表单提交的路径配置如下

action="${
   pageContext.request.contextPath}/command.do

于是我们创建一个控制器CommandController

package web.Controller;import org.springframework.validation.BindException;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.AbstractCommandController;import web.model.User;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CommandController extends AbstractCommandController {
       public CommandController(){
           //这么做的作用在于告诉SpringMVC把表单的数据存到User里面去        this.setCommandClass(User.class);    }    @Override    /**     * @param o 将表单数据存到一个User对象中，这个对象传递给了o     */    protected ModelAndView handle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, BindException e) throws Exception {
           System.out.println((User)o);        ModelAndView mav = new ModelAndView("user/userInfo");        httpServletRequest.setAttribute("user",(User)o);        return mav;    }}

下图我们发现AbstractCommandController间接的实现了Controller接口

userInfo.jsp的内容如下:

<%--  Created by IntelliJ IDEA.  User: Administrator  Date: 2020/7/30  Time: 0:30  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %>    表单提交数据:
用户名:${
   user.name}
密码:${
   user.password}
性别:${
   user.gender}
年龄:${
   user.birthday}

接下来我们访问:

   
   	
    
     EncodingFilter
    	
    
     org.springframework.web.filter.CharacterEncodingFilter
    	
    		
     
      encoding
     		
     
      UTF-8
     	
    
   
   	
    
     EncodingFilter
    	
    
     /*
    
   

成功:

转载地址：http://fxlzi.baihongyu.com/