一、SpringMVC处理流程
SpringMVC大体处理流程:
二、DispatcherServlet前端控制器
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_3_1.xsd"
version="3.1">
<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>
<!--前端控制器-->
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 如果没有下面的设置,则默认找 /WEB-INF/[servlet的名称]-servlet.xml
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:dispatcher-servlet.xml</param-value>
</init-param>
-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<!--
1. /* 拦截所有 jsp js png .css 真的全拦截 建议不使用
2. *.action *.do 拦截以do action 结尾的请求 肯定能使用 ERP
3. / 拦截所有 (不包括jsp) (包含.js .png.css) 强烈建议使用 前台 面向消费者 www.jd.com/search /对静态资源放行
-->
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
三、SpringMVC入门程序
dispatcher.xml:
直接配置处理器映射器和处理器适配器比较麻烦,可以使用注解驱动来加载。
SpringMVC使用<mvc:annotation-driven>
自动加载RequestMappingHandlerMapping和RequestMappingHandlerAdapter
可以在springmvc.xml配置文件中使用替代注解处理器和适配器的配置。
<?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.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 扫描@Controler-->
<context:component-scan base-package="controller"/>
<!-- 只把动态信息当做controller处理,忽略静态信息 -->
<mvc:default-servlet-handler/>
<!-- 开启注解 -->
<mvc:annotation-driven/>
<!--ViewResolver 视图解析器-->
<!--用于支持Servlet、JSP视图解析-->
<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="//"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
ItemControllerl:
@Controller //@Controller注解:采用注解的方式定义该类为处理请求的Controller类
public class ItemController {
@RequestMapping(value = "/item/itemlist.action")
public ModelAndView itemList(){
// 创建页面需要显示的商品数据
List<Items> list = new ArrayList<Items>();
list.add(new Items(1, "1华为 荣耀8", 2399f, new Date(), "质量好!1"));
list.add(new Items(2, "2华为 荣耀8", 2399f, new Date(), "质量好!2"));
list.add(new Items(3, "3华为 荣耀8", 2399f, new Date(), "质量好!3"));
list.add(new Items(4, "4华为 荣耀8", 2399f, new Date(), "质量好!4"));
list.add(new Items(5, "5华为 荣耀8", 2399f, new Date(), "质量好!5"));
list.add(new Items(6, "6华为 荣耀8", 2399f, new Date(), "质量好!6"));
ModelAndView mav = new ModelAndView();
//数据
mav.addObject("itemList", list);
mav.setViewName("WEB-INF/jsp/itemList");
return mav;
}
}
POJO:
package pojo;
import java.util.Date;
public class Items {
public Items(Integer id, String name, Float price, Date createtime, String detail) {
super();
this.id = id;
this.name = name;
this.price = price;
this.createtime = createtime;
this.detail = detail;
}
private Integer id;
private String name;
private Float price;
private String pic;
private Date createtime;
private String detail;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name == null ? null : name.trim();
}
public Float getPrice() {
return price;
}
public void setPrice(Float price) {
this.price = price;
}
public String getPic() {
return pic;
}
public void setPic(String pic) {
this.pic = pic == null ? null : pic.trim();
}
public Date getCreatetime() {
return createtime;
}
public void setCreatetime(Date createtime) {
this.createtime = createtime;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail == null ? null : detail.trim();
}
}
itemList.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<!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>查询商品列表</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/item/queryitem.action" method="post">
查询条件:
<table width="100%" border=1>
<tr>
<td><input type="submit" value="查询"/></td>
</tr>
</table>
商品列表:
<table width="100%" border=1>
<tr>
<td>商品名称</td>
<td>商品价格</td>
<td>生产日期</td>
<td>商品描述</td>
<td>操作</td>
</tr>
<c:forEach items="${itemList }" var="item">
<tr>
<td>${item.name }</td>
<td>${item.price }</td>
<td><fmt:formatDate value="${item.createtime}" pattern="yyyy-MM-dd HH:mm:ss"/></td>
<td>${item.detail }</td>
<td><a href="${pageContext.request.contextPath }/itemEdit.action?id=${item.id}">修改</a></td>
</tr>
</c:forEach>
</table>
</form>
</body>
</html>
运行结果:
四、SpringMVC架构说明
画了个图,用了好久~.~:
五、SpringMVC整合Mybatis
applicationContext.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
<context:property-placeholder location="classpath:db.properties"/>
<!-- 数据库连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="maxActive" value="10" />
<property name="maxIdle" value="5" />
</bean>
<!-- Mybatis的工厂 -->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!-- 核心配置文件的位置 -->
<property name="configLocation" value="classpath:sqlMapConfig.xml"/>
</bean>
<!-- Mapper动态代理开发 扫描 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 基本包 -->
<property name="basePackage" value="com.long.springmvc.dao"/>
</bean>
<!-- 注解事务 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 开启注解 -->
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
sqlMapper.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 设置别名 -->
<typeAliases>
<!-- 2. 指定扫描包,会把包内所有的类都设置别名,别名的名称就是类名,大小写不敏感 -->
<package name="com.long.springmvc.pojo" />
</typeAliases>
</configuration>
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>springmvc-mybatis</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>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!-- Spring监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 处理POST提交乱码问题 -->
<filter>
<filter-name>encoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<!-- 前端控制器 -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 默认找 /WEB-INF/[servlet的名称]-servlet.xml -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<!--
1. /* 拦截所有 jsp js png .css 真的全拦截 建议不使用
2. *.action *.do 拦截以do action 结尾的请求 肯定能使用 ERP
3. / 拦截所有 (不包括jsp) (包含.js .png.css) 强烈建议使用 前台 面向消费者 www.jd.com/search /对静态资源放行
-->
<url-pattern>*.action</url-pattern>
</servlet-mapping>
</web-app>
六、从Mysql中查询商品列表
ItemController:
@Controller
public class ItemController {
@Autowired
private ItemService itemService;
//入门程序 第一 包类 + 类包 + 方法名
@RequestMapping(value = "/item/itemlist.action")
public ModelAndView itemList(){
//从Mysql中查询
List<Items> list = itemService.selectItemsList();
ModelAndView mav = new ModelAndView();
//数据
mav.addObject("itemList", list);
mav.setViewName("itemList");
return mav;
}
Service接口:
public interface ItemService {
//查询商品列表
public List<Items> selectItemsList();
}
Service实现类:
@Service
public class ItemServiceImpl implements ItemService {
@Autowired
private ItemsMapper itemsMapper;
//查询商品列表
public List<Items> selectItemsList(){
return itemsMapper.selectByExampleWithBLOBs(null);
}
}
ItemsMapper接口:
public interface ItemsMapper {
List<Items> selectByExample(ItemsExample example);
}
ItemsMapper.xml:
<select id="selectByExample" resultMap="BaseResultMap" parameterType="com.long.springmvc.pojo.ItemsExample" >
select
<if test="distinct" >
distinct
</if>
<include refid="Base_Column_List" />
from items
<if test="_parameter != null" >
<include refid="Example_Where_Clause" />
</if>
<if test="orderByClause != null" >
order by ${orderByClause}
</if>
</select>
七、参数绑定
简单类型:
//去修改页面 入参 id
@RequestMapping(value = "/itemEdit.action")
// public ModelAndView toEdit(@RequestParam(value = "id",required = false,defaultValue = "1") Integer idaaq,
public ModelAndView toEdit(Integer id,
HttpServletRequest request,HttpServletResponse response
,HttpSession session,Model model){
//Servlet时代开发
// String id = request.getParameter("id");
//查询一个商品
// Items items = itemService.selectItemsById(Integer.parseInt(id));
Items items = itemService.selectItemsById(id);
ModelAndView mav = new ModelAndView();
//数据
mav.addObject("item", items);
mav.setViewName("editItem");
return mav;
}
使用@RequestParam常用于处理简单类型的绑定。
public String queryItemById(@RequestParam(value = "itemId", required = true, defaultValue = "1")
绑定POJO:
如果提交的参数很多,或者提交的表单中的内容很多的时候,可以使用简单类型接受数据,也可以使用pojo接收数据。
八、springmvc与struts2不同
1、springmvc的入口是一个servlet即前端控制器,而struts2入口是一个filter过滤器。
2、springmvc是基于方法开发(一个url对应一个方法),请求参数传递到方法的形参,可以设计为单例或多例(建议单例),struts2是基于类开发,传递参数是通过类的属性,只能设计为多例。
3、Struts采用值栈存储请求和响应的数据,通过OGNL存取数据, springmvc通过参数解析器是将request请求内容解析,并给方法形参赋值,将数据和视图封装成ModelAndView对象,最后又将ModelAndView中的模型数据通过request域传输到页面。Jsp视图解析器默认使用jstl。
转载请标明出处,原文地址:https://blog.csdn.net/weixin_41835916
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