spring MVC实现增加与查询-

1.运行环境  

idea 2017.3.5  & java 1.9  & Tomcat 8.5.31

文件布局

2.实现  在网页上 如图

<1>登录   添加页面 端口号/add

 <2>添加成功后

<3>查看添加信息

<4> 查询更多

 3.运行原理  

发请求--》web.xml-》控制器UserController（处理服务）-》dispatcher -servlet.xml  转发服务 -》视图 *.jsp-》 显示 

4.代码详情

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
<!--只能通过后缀名是.mvc 访问   -->
        <url-pattern>*.mvc</url-pattern>
    </servlet-mapping>


</web-app>

实体类

#Gender.java
package ke_1014.cn.ccut.domain;
public enum Gender {
    MALE,
    FEMALE;
}


#User.java
package ke_1014.cn.ccut.domain;
public class User {
    private String name;
    private String lastname;
    private String password;
    private String detail;
    //@DateTimeFormat(pattern="yyyy-MM-dd")
    private String birthDate;
    private Gender gender;
    private String country;
    private boolean nonSmoking;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getLastname() {
        return lastname;
    }

    public void setLastname(String lastname) {
        this.lastname = lastname;
    }
    
    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getDetail() {
        return detail;
    }

    public void setDetail(String detail) {
        this.detail = detail;
    }

    public String getBirthDate() {
        return birthDate;
    }

    public void setBirthDate(String birthDate) {
        this.birthDate = birthDate;
    }

    public Gender getGender() {
        return gender;
    }

    public void setGender(Gender gender) {
        this.gender = gender;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }
    public boolean isNonSmoking() {
        return nonSmoking;
    }
    public void setNonSmoking(boolean nonSmoking) {
        this.nonSmoking = nonSmoking;
    }
}

UserController.java

package ke_1014.cn.ccut.controller;
import java.util.HashMap;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import ke_1014.cn.ccut.domain.Gender;
import ke_1014.cn.ccut.domain.User;
@Controller
public class UserController {
    private static final String[] countries = { "China","Turkey", "United States", "Germany" };
    Map<String,User> mp=new HashMap<String,User>();
    //加载页面信息
    @RequestMapping(value ="/add")
    public ModelAndView add() {
        ModelAndView modelAndView = new ModelAndView("useradd", "user", new User());
        modelAndView.addObject("genders", Gender.values());
        modelAndView.addObject("countries", countries);        
        return modelAndView;
    }
    //查询当前用户信息
    @RequestMapping(value = "/selectU")
    public ModelAndView processUser(String  name) {
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("selectUser");
        modelAndView.addObject("u", mp.get(name));
        return modelAndView;
    }
    //添加一个用户
    @RequestMapping(value = "/addok")
    public ModelAndView processUser1(User user) {
        mp.put(user.getName(), user);
        System.out.println(mp.size());
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("addok");
        modelAndView.addObject("u", user);    
        return modelAndView;
    }
    //查询添加的所有
    @RequestMapping(value = "/selectA")
    public ModelAndView processselectA() {
        ModelAndView modelAndView =new ModelAndView();
        modelAndView.setViewName("selectAll");
        modelAndView.addObject("u",mp);
        return modelAndView;
    }
//查询指定用户
    @RequestMapping(value = "/selectB")
        public ModelAndView processselectB() {
        
            ModelAndView modelAndView =new ModelAndView();
            modelAndView.setViewName("selectAll");
            User use1=mp.get("456");
            modelAndView.addObject("u",use1 );
            return modelAndView;
        }
}

web-infpages

useradd.jsp

<%@ page contentType="text/html; charset=utf-8" %>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="mvc" %>
<html>
<head>
    <title>用户添加</title>
</head>
<body><center>

<h2>用户添加表单</h2>
<mvc:form modelAttribute="user" action="addok.mvc">
    <table>
        <tr>
            <td><mvc:label path="name">用户名：</mvc:label></td>
            <td><mvc:input path="name" /></td>
        </tr>
        <tr>
            <td><mvc:label path="lastname">姓</mvc:label></td>
            <td><mvc:input path="lastname" /></td>
        </tr>
        <tr>
            <td><mvc:label path="password">密码</mvc:label></td>
            <td><mvc:password path="password" /></td>
        </tr>
           <tr>
            <td><mvc:label path="detail">用户详情</mvc:label></td>
            <td><mvc:textarea path="detail" /></td>
        </tr>
        <tr>
            <td><mvc:label path="birthDate">出生日期 </mvc:label></td>
            <td><mvc:input path="birthDate" /></td>
        </tr>
        <tr>
            <td><mvc:label path="gender">性别</mvc:label></td>
            <td><mvc:radiobuttons path="gender" items="${genders}" /></td>
        </tr>
        <tr>
            <td><mvc:label path="country">城市</mvc:label></td>
            <td><mvc:select path="country" items="${countries}" /></td>
        </tr>
        <tr>
            <td><mvc:label path="nonSmoking">吸烟不</mvc:label></td>
            <td><mvc:checkbox path="nonSmoking" /></td>
        </tr>
        <tr>
            <td colspan="2">
                <input type="submit" value="Submit" />
            </td>
        </tr>
    </table>  
</mvc:form></center>
</body>
</html>

addok.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="mvc" %>
<html><center>
姓名：${u.name}  添加成功!<br />
<button> <a href="selectU.mvc?name=${u.name}">查看这个姓名的更多信息</a><br /></button>
<button> <a href="selectA.mvc">查看所有已添加用户信息</a></button>
 </center>
    </body>
</html>

selectUser.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="mvc" %>
<html>
<head><center>
    <title>成功添加</title>
</head>
<body>
    <h2>用户添加结果</h2>
    <table>
        <tr>
            <td>姓名</td>
            <td>${u.name}</td>
        </tr>
        <tr>
            <td>姓</td>
            <td>${u.lastname}</td>
        </tr>
        <tr>
            <td>用户密码</td>
            <td>${u.password}</td>
        </tr>
        <tr>
            <td>用户详情</td>
            <td>${u.detail}</td>
        </tr>
        <tr>
            <td>出生日期</td>
            <td>${u.birthDate}</td>
        </tr>
        <tr>
            <td>性别</td>
            <td>${u.gender}</td>
        </tr>
        <tr>
            <td>城市</td>
            <td>${u.country}</td>
        </tr>
        <tr>
            <td>不吸烟</td>
            <td>${u.nonSmoking}</td>
        </tr>
    </table>
    <button><a href="add.mvc">继续添加</a> </button>
    <button> <a href="selectA.mvc">查看所有已添加用户信息</a></button>

</body>
</body>
</html>

selectAll.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="mvc"   %>
<html><center>
<head>
    <title>成功添加</title>
</head>
<body>
    <h2>用户添加结果</h2>
    <table  border="1" >
        <tr>
            <th>姓名</th>
            <th>用户密码</th>
            <th>城市</th>
            <%--<c:forEach var="item" items=" ${u.keySet()}">--%>
        </tr>
            <c:forEach var="item" items="${u}">
            <tr>
                <%--<td>${item.key}</td>--%>
                <td>${item.value.name} </td>
                <td>${item.value.password}</td>
                    <td>${item.value.country}</td>
           </tr>
            </c:forEach>
    </table><br />
    <button><a href="add.mvc">继续添加</a> </button>
</body>
    </center>
</html>