SpringMVC案例1——对User表进行CRUD操作-白红宇

SpringMVC案例1——对User表进行CRUD操作

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发布时间：2019-06-19

本文共 10434 字，大约阅读时间需要 34 分钟。

------------------------------------------------------------------web.xml-----------------------------------------------------------------------------------------

xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

<display-name>SpringMVCTest3</display-name>

<welcome-file-list>

<welcome-file>index.html</welcome-file>

<welcome-file>index.htm</welcome-file>

<welcome-file>index.jsp</welcome-file>

<welcome-file>default.html</welcome-file>

<welcome-file>default.htm</welcome-file>

<welcome-file>default.jsp</welcome-file>

</welcome-file-list>

<servlet-name>springDispatcherServlet</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:spring.xml</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>springDispatcherServlet</servlet-name>

<url-pattern>/</url-pattern>

</servlet-mapping>

<filter-name>HiddenHttpMethodFilter</filter-name>

<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>HiddenHttpMethodFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

---------------------------------------------------spring.xml-------------------------------------------------------------

<?xml version="1.0" encoding="UTF-8"?

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"

xmlns:mvc="http://www.springframework.org/schema/mvc"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

<context:component-scan base-package="controller;dao;domain" />

</bean>

<!-- 将在SpringMVC上下文中定义一个DefaultServletHttpRequestHandler，他会对进入DispatcherServlet的请求进行筛选，假设发现是没经过映射的请求，就将请求交给WEB的应用server默认的Servlet处理，假设不是静态资源的请求，才由DispatcherServlet继续处理

一般WEB应用server的Servlet的名称都是default -->

<mvc:default-servlet-handler />

<mvc:annotation-driven></mvc:annotation-driven>

</beans>

---------------------------------------------------------------------------------------------------comtroller.UserHandler.java--------------------------------------------

package controller;

//@Controller注解：将该类表示为控制器

@Controller

public class UserHandler {

// @Autowired它能够对类成员变量、方法及构造函数进行标注，完毕自己主动装配的工作。通过 @Autowired的使用来消除 set,get方法。

@Autowired

private UserDao userDao;

@Autowired

private AddressDao addressDao;

/**

* 有 @ModelAttribute标记的方法。会在每一个目标方法运行之前被SpringMVC调用。

* @RequestParam(value="id", required=false)表单中的參数，required表示是否必须

@ModelAttribute

public void setUser(@RequestParam(value="id", required=false)Integer id, Map<String, Object> map){

if(id != null){

map.put("user", userDao.getUser(id));

}

/**

* 改动保存操作

* @RequestMapping("/addUser")使用requestMapping来映射URL method相应的请求方式

@RequestMapping(value="/saveUser", method=RequestMethod.PUT)

public String updateUser(User user){

userDao.saveUser(user);

return "redirect:/getUsers";

}

/**

* 编辑改动操作

* @RequestMapping("/addUser")使用requestMapping来映射URL method相应的请求方式

* @PathVariable("id")路径URL中的參数信息

@RequestMapping(value="/editUser/{id}", method=RequestMethod.GET)

public String editUser(@PathVariable("id") Integer id, Map<String, Object> map){

map.put("addresses", addressDao.getAddresses());

map.put("user", userDao.getUser(id));

return "add";

}

/**

* 删除操作

* @RequestMapping("/addUser")使用requestMapping来映射URL method相应的请求方式

* @PathVariable("id")进行接受參数

@RequestMapping(value="/deleteUser/{id}", method=RequestMethod.DELETE)

public String deleteUser(@PathVariable("id") Integer id){

userDao.deleteUser(id);

//删除后进行显示操作

return "redirect:/getUsers";

}

/**

* 保存操作

* @RequestMapping("/addUser")使用requestMapping来映射URL method相应的请求方式

@RequestMapping(value = "/saveUser", method = RequestMethod.POST)

public String saveUser(User user) {

userDao.saveUser(user);

// 保存完毕后进入到显示操作

return "redirect:/getUsers";

}

/**

* 进入到加入操作页面

* @RequestMapping("/addUser")使用requestMapping来映射URL method相应的请求方式

@RequestMapping(value = "/addUser", method = RequestMethod.GET)

public String addUser(Map<String, Object> map) {

map.put("addresses", addressDao.getAddresses());

// 相应struts1里边的from表单对象

map.put("user", new User());

return "add";

}

/**

* 显示操作

* @RequestMapping("/addUser")使用requestMapping来映射URL method相应的请求方式

@RequestMapping("/getUsers")

public String getUses(Map<String, Object> map) {

map.put("users", userDao.getUsers());

return "list";

}

-------------------------------------------dao.UserDao.java------------------------------------------------------------

package dao;

//@Repository注解：它用于将数据訪问层 (DAO 层 ) 的类标识为 Spring Bean

@Repository

public class UserDao {

private static Map<Integer, User> users;

@Autowired

private AddressDao addressDao;

static {

users = new HashMap<Integer, User>();

users.put(1, new User(1, "a", 11, 1, new Address(101, "beijing")));

users.put(2, new User(2, "b", 22, 0, new Address(102, "shanghai")));

users.put(3, new User(3, "c", 33, 1, new Address(103, "guangzhou")));

}

private static Integer initId = 4;

public void saveUser(User user) {

if (user.getId() == null) {

user.setId(initId++);

}

user.setAddress(addressDao.getAddress(user.getAddress().getId()));

users.put(user.getId(), user);

}

public Collection<User> getUsers() {

return users.values();

}

public User getUser(Integer id) {

return users.get(id);

}

public User deleteUser(Integer id) {

return users.remove(id);

}

-------------------------------------------------------------dao.AddressDao.java-------------------------------------------------------------------

package dao;

@Repository

public class AddressDao {

private static Map<Integer, Address> addresses;

static {

addresses = new HashMap<Integer, Address>();

addresses.put(101, new Address(101, "beijign"));

addresses.put(102, new Address(102, "shanghai"));

addresses.put(103, new Address(103, "guangzhou"));

}

public Collection<Address> getAddresses() {

return addresses.values();

}

public Address getAddress(Integer id) {

return addresses.get(id);

}

-----------------------------------------domain------------------------------------------------

package domain;

public class Address {

private Integer id;

private String name;

}

----------------------------

package domain;

public class User {

private Integer id;

private String name;

private Integer age;

private Integer sex;

private Address address;

}

--------------------------------------------views/jsp------------------------------------------

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

</head>

<body>

<c:if test="${

empty requestScope.users }">

没有不论什么员工信息

</c:if>

<c:if test="${!empty requestScope.users }">

<tr>

<th>address</th>

<th>delete</th>

</tr>

<c:forEach items="${requestScope.users }" var="user">

<tr>

<td>${user.address.name}</td>

<td>

</form></td>

</tr>

</c:forEach>

</table>

</c:if>

<br>

<a href="addUser">addUser</a>

</body>

</html>

---------------------------------------------------------------------------

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@page import="java.util.HashMap"%>

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

</head>

<body>

<form:form action="${pageContext.request.contextPath }/saveUser" method="POST" modelAttribute="user">

<c:if test="${user.name==null }">

name:<form:input path="name"/><br>

</c:if>

<c:if test="${user.name!=null }">

<form:hidden path="id"/>

</c:if>

age:<form:input path="age"/><br>

HashMap<String, String> sex = new HashMap<String, String>();

sex.put("0", "女");

sex.put("1", "男");

request.setAttribute("sex", sex);

sex:<form:radiobuttons path="sex" items="${sex }"/><br>

address:<form:select path="address.id" items="${addresses }" itemLabel="name" itemValue="id"/><br>

</form:form>

</body>

</html>

============================================SpringMVC form标签===============================================================

<!-- form：radiobutton:单选框组建标签。对那个表单bean相应的属性和value值相等时。单选框被选中。

-->

<!-- form：radiobuttons：单选框组件标签，用于构造多个单选框

-items：能够是一个list、String【】或者map

-itemValue：指定radio的value值。能够是集合中的bean的一个属性值

-itemLabel：指定radio的label值

-delimiter：多个单选框能够通过delimiter指定切割符 -->

<!--form：checkbox:复选框组件。

用户构造单个复选框

form：checkboxs：用户构造多个复选框。使用方式同form：radiobuttons标签

form:select:用于构造下拉框组件，使用方式等同于form：radiobuttons标签

form:option :下拉框选项组件标签。使用方式等同于form：radiobuttons标签

from：errors：显示表单组件或数据校验所相应的错误 -->

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