Spring MVC

引 jar 包

aopalliance.jar
aspectjweaver.jar
commons-logging-1.2.jar
spring-aop-3.2.16.RELEASE.jar
spring-beans-3.2.16.RELEASE.jar
spring-context-3.2.16.RELEASE.jar
spring-core-3.2.16.RELEASE.jar
spring-expression-3.2.16.RELEASE.jar
spring-web-3.2.16.RELEASE.jar
spring-webmvc-3.2.16.RELEASE.jar

在web中配备依赖

//解决中文乱码问题

<filter>
<filter-name>filterinto</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>filterinto</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-servlet1.xml</param-value>
</init-param>

//启动级别数字越小级别越大
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

配备资源文件springmvc-servlet1.xml

　　springmvc-servlet1.xml里面的文件内容

<?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:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
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com.bdqn.chontroller层

<context:component-scan base-package="com.bdqn.chontroller"></context:component-scan>

//逻辑视图解析器

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"/>
<property name="suffix" value=".jsp" />
</bean>

//拦截器

<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/*"/>
<mvc:exclude-mapping path="/login"/>
<bean class="com.bdqn.util.loginfilter"></bean>
</mvc:interceptor>
</mvc:interceptors>
</beans>

前后台交互

前台

login页面

index页面

后台

后台向前台传值的方式

1.使用map向页面传值

@Controller
public class UserController {
@RequestMapping("/demo1")
public String getdemo1(Map<String, Object> map){

map.put("n","list数据");
return "index";
}

通过request 传值

@RequestMapping("/demo2")
public String getdemo2(HttpServletRequest request){
List<User> users=new ArrayList<User>();
for(int i=0;i<=10;i++){
User user = new User();
user.setName("n:"+i);
user.setPassword("p:"+i);
users.add(user);
}
request.setAttribute("l", users);
return "index";
}

2.使用model 向页面传值
@RequestMapping("/demo3")
public String getdemo3(Model request){
List<User> users=new ArrayList<User>();
for(int i=0;i<=10;i++){
User user = new User();
user.setName("n:"+i);
user.setPassword("p:"+i);
users.add(user);
}
request.addAttribute("l", users);
return "index";
}

前台jstl表达式

   <s:forEach items="${list}" var="t">

      ${t.id}  ${t.name} <br />

   </s:forEach>

3第三种通过modelandview传值

@RequestMapping("/demo4")
public ModelAndView getdemo4(HttpSession session,String b){
List<User> users=new ArrayList<User>();
for(int i=0;i<=10;i++){
User user = new User();
user.setName("n:"+i);
user.setPassword("p:"+i);
users.add(user);
}
System.out.println(b);
session.setAttribute("s", "中文");
ModelAndView a=new ModelAndView();
a.setViewName("index");
a.addObject("l",users);
return a;
}

使用spring mvc拦截器

1.配置拦截器规则指向自定义的类

   <mvc:interceptors> 

        <mvc:interceptor>  

            <mvc:mapping path="/book/*"/>  

            <!-- 定义在mvc:interceptor下面的表示是对特定的请求才进行拦截的 -->  

            <bean class="com.bdqn.filter.loginfilter"/>  

        </mvc:interceptor>  

      </mvc:interceptors>

2.定义loginfilter类实现接口HandlerInterceptor。并实现三个方法

3session的值为登录后添加

spring mvc集成了jsp的内置对象我们可以直接使用。如上图所示。

spring MVC异常处理机制

3.1全局异常处理

1.在配置文件中配置全局异常信息

  <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">  

      

        <property name="exceptionMappings">  

            <props>  

                <prop key="java.lang.RuntimeException">error</prop>   

            </props>  

        </property>  

</bean>  

2.模拟一个异常信息如：

int j=new Integer("sss");

3.error通过试图解析找到视图

          <!-- 全局异常 -->

    ${exception.message}