发表于： 2017-10-01 23:54:16
1 680
今天完成的任务
在网页上打印出通过查询数据库获得的表格
1.首先写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"
xmlns:web="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" version="2.5">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/springMVC.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
下面的地方比较常见的，即普通的springmvc配置
要装配联系装配数据库的配置文件applicationContext.xml
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
2.接着写applicationContext.xml
applicationContext.xml的配置和任务一的时候没差别
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:annotation-config />
<context:component-scan base-package="com.how2java.service" />
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName">
<value>com.mysql.jdbc.Driver</value>
</property>
<property name="url">
<value>jdbc:mysql://47.94.245.252:3306/how2java?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC</value>
</property>
<property name="username">
<value>root</value>
</property>
<property name="password">
<value>123456</value>
</property>
</bean>
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="typeAliasesPackage" value="com.how2java.pojo" />
<property name="dataSource" ref="dataSource"/>
<property name="mapperLocations" value="classpath:com/how2java/mapper/*.xml"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.how2java.mapper"/>
</bean>
</beans>
3.再写springMVC.xml
springMVC.xml是映射打印在网页上的jsp文件和ssm中的控制类。
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<context:annotation-config/>
<context:component-scan base-package="com.how2java.controller">
<context:include-filter type="annotation"
expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<mvc:annotation-driven />
<mvc:default-servlet-handler />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
通过此调用controller层
<context:annotation-config/>
<context:component-scan base-package="com.how2java.controller">
<context:include-filter type="annotation"
expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
listCategory.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="java.util.*"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<table align='center' border='1' cellspacing='0'>
<tr>
<td>id</td>
<td>name</td>
</tr>
<c:forEach items="${cs}" var="c" varStatus="st">
<tr>
<td>${c.id}</td>
<td>${c.name}</td>
</tr>
</c:forEach>
</table>
<c:forEach items="${cs}" var="c" varStatus="st">
<tr>
<td>${c.id}</td>
<td>${c.name}</td>
</tr>
</c:forEach>
迭代循环
语法:
<c:forEach var="每个变量名字" items="要迭代的list" varStatus="每个对象的状态"
begin="循环从哪儿开始" end="循环到哪儿结束" step="循环的步长">
循环要输出的东西
</c:forEach>
遍历category cs；
-------------------------------------------------------------------------------------------------------------------------------------------------------
上面的都是基础配置
下面即为整合spring+mybatis+springmvc
1.映射的类
public class Category {
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Category [id=" + id + ", name=" + name + "]";
}
}
这个大家已经很熟悉了
2.映射sql语句的接口，这个大家也很熟悉了
public interface CategoryMapper {
@Select("select * from category_")
public List<Category> list();
}
昨天遇到问题是单纯的将list语句映射到controller中标签繁重的问题
资料上是如此解决的
首先创建一个service层的接口
public interface CategoryService {
List<Category> list();
}
然后创建一个继承此接口的类
@Service
public class CategoryServiceImpl implements CategoryService {
@Autowired
CategoryMapper categoryMapper;
public List<Category> list(){
return categoryMapper.list();
}
}
声明为service层的类，并且CategoryMapper。
注意的一点是如果不使用接口是不行的
并需要通过applicationContext.xml纳入spring的生命周期
现在就可以比较简单的在controller类里调用sql返回的category
@Controller
@RequestMapping("")
public class CategoryController {
@Autowired
CategoryService categoryService;
@RequestMapping("listCategory")//路径映射
public ModelAndView listCategory(){
ModelAndView mav = new ModelAndView();
List<Category> cs= categoryService.list();
// 放入转发参数
mav.addObject("cs", cs);
// 放入jsp路径
mav.setViewName("listCategory");
return mav;
}
}
@Controller声明是controller层
@RequestMapping("")
@RequestMapping("listCategory")//路径映射
声明调用网页的路径，两个分别是第一层和第二层的路径
,http://localhost/ ""/listCategory(http://localhost/listCategory)
@Autowired
CategoryService categoryService;
装配categoryService
*注意的一点是categoryService是service层的接口，categorymapper是调用sql语句的接口
public ModelAndView listCategory(){return mav;}
返回的是一个ModeAndView的数据类型
至此ssm框架搭建完成
遇到的问题
还是不是很理解ssm框架的一些细节
明天要做的事
接着看
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