以下内容是经过自己整理资料、官方文档所得:
web.xml 配置:
- <servlet>
- <servlet-name>dispatcher</servlet-name>
- <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
- <init-param>
- <description>加载/WEB-INF/spring-mvc/目录下的所有XML作为Spring MVC的配置文件</description>
- <param-name>contextConfigLocation</param-name>
- <param-value>/WEB-INF/spring-mvc/*.xml</param-value>
- </init-param>
- <load-on-startup>1</load-on-startup>
- </servlet>
- <servlet-mapping>
- <servlet-name>dispatcher</servlet-name>
- <url-pattern>*.htm</url-pattern>
- </servlet-mapping>
这样,所有的.htm的请求,都会被DispatcherServlet处理;
初始化 DispatcherServlet 时,该框架在 web 应用程序WEB-INF 目录中寻找一个名为[servlet-名称]-servlet.xml的文件,并在那里定义相关的Beans,重写在全局中定义的任何Beans,像上面的web.xml中的代码,对应的是dispatcher-servlet.xml;当然也可以使用<init-param>元素,手动指定配置文件的路径;
dispatcher-servlet.xml 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:mvc="http://www.springframework.org/schema/mvc"
- xmlns:p="http://www.springframework.org/schema/p"
- xmlns:context="http://www.springframework.org/schema/context"
- xmlns:aop="http://www.springframework.org/schema/aop"
- xmlns:tx="http://www.springframework.org/schema/tx"
- xsi:schemaLocation="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/aop
- http://www.springframework.org/schema/aop/spring-aop-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-3.0.xsd
- http://www.springframework.org/schema/context
- http://www.springframework.org/schema/context/spring-context-3.0.xsd">
- <!--
- 使Spring支持自动检测组件,如注解的Controller
- -->
- <context:component-scan base-package="com.minx.crm.web.controller"/>
- <bean id="viewResolver"
- class="org.springframework.web.servlet.view.InternalResourceViewResolver"
- p:prefix="/WEB-INF/jsp/"
- p:suffix=".jsp" />
- </beans>
第一个Controller:
- package com.minx.crm.web.controller;
- import org.springframework.stereotype.Controller;
- import org.springframework.web.bind.annotation.RequestMapping;
- @Controller
- public class IndexController {
- @RequestMapping("/index")
- public String index() {
- return "index";
- }
- }
@Controller注解标识一个控制器,@RequestMapping注解标记一个访问的路径(/index.htm),return "index"标记返回视图(index.jsp);
注:如果@RequestMapping注解在类级别上,则表示一相对路径,在方法级别上,则标记访问的路径;
从@RequestMapping注解标记的访问路径中获取参数:
Spring MVC 支持RESTful风格的URL参数,如:
- @Controller
- public class IndexController {
- @RequestMapping("/index/{username}")
- public String index(@PathVariable("username") String username) {
- System.out.print(username);
- return "index";
- }
- }
在@RequestMapping中定义访问页面的URL模版,使用{}传入页面参数,使用@PathVariable 获取传入参数,即可通过地址:http://localhost:8080/crm/index/tanqimin.htm 访问;
根据不同的Web请求方法,映射到不同的处理方法:
使用登陆页面作示例,定义两个方法分辨对使用GET请求和使用POST请求访问login.htm时的响应。可以使用处理GET请求的方法显示视图,使用POST请求的方法处理业务逻辑;
- @Controller
- public class LoginController {
- @RequestMapping(value = "/login", method = RequestMethod.GET)
- public String login() {
- return "login";
- }
- @RequestMapping(value = "/login", method = RequestMethod.POST)
- public String login2(HttpServletRequest request) {
- String username = request.getParameter("username").trim();
- System.out.println(username);
- return "login2";
- }
- }
在视图页面,通过地址栏访问login.htm,是通过GET请求访问页面,因此,返回登陆表单视图login.jsp;当在登陆表单中使用POST请求提交数据时,则访问login2方法,处理登陆业务逻辑;
防止重复提交数据,可以使用重定向视图:
- return "redirect:/login2"
可以传入方法的参数类型:
- @RequestMapping(value = "login", method = RequestMethod.POST)
- public String testParam(HttpServletRequest request, HttpServletResponse response, HttpSession session) {
- String username = request.getParameter("username");
- System.out.println(username);
- return null;
- }
可以传入HttpServletRequest、HttpServletResponse、HttpSession,值得注意的是,如果第一次访问页面,HttpSession没被创建,可能会出错;
其中,String username = request.getParameter("username");可以转换为传入的参数:
- @RequestMapping(value = "login", method = RequestMethod.POST)
- public String testParam(HttpServletRequest request, HttpServletResponse response, HttpSession session,@RequestParam("username") String username) {
- String username = request.getParameter("username");
- System.out.println(username);
- return null;
- }
使用@RequestParam 注解获取GET请求或POST请求提交的参数;
获取Cookie的值:使用@CookieValue :
获取PrintWriter:
可以直接在Controller的方法中传入PrintWriter对象,就可以在方法中使用:
- @RequestMapping(value = "login", method = RequestMethod.POST)
- public String testParam(PrintWriter out, @RequestParam("username") String username) {
- out.println(username);
- return null;
- }
获取表单中提交的值,并封装到POJO中,传入Controller的方法里:
POJO如下(User.java):
- public class User{
- private long id;
- private String username;
- private String password;
- …此处省略getter,setter...
- }
通过表单提交,直接可以把表单值封装到User对象中:
- @RequestMapping(value = "login", method = RequestMethod.POST)
- public String testParam(PrintWriter out, User user) {
- out.println(user.getUsername());
- return null;
- }
可以把对象,put 入获取的Map对象中,传到对应的视图:
- @RequestMapping(value = "login", method = RequestMethod.POST)
- public String testParam(User user, Map model) {
- model.put("user",user);
- return "view";
- }
在返回的view.jsp中,就可以根据key来获取user的值(通过EL表达式,${user }即可);
Controller中方法的返回值:
void:多数用于使用PrintWriter输出响应数据;
String 类型:返回该String对应的View Name;
任意类型对象:
返回ModelAndView:
自定义视图(JstlView,ExcelView):
拦截器(Inteceptors):
- public class MyInteceptor implements HandlerInterceptor {
- public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o)
- throws Exception {
- return false;
- }
- public void postHandle(HttpServletRequest request, HttpServletResponse response, Object o, ModelAndView mav)
- throws Exception {
- }
- public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object o, Exception excptn)
- throws Exception {
- }
- }
拦截器需要实现HandleInterceptor接口,并实现其三个方法:
preHandle:拦截器的前端,执行控制器之前所要处理的方法,通常用于权限控制、日志,其中,Object o表示下一个拦截器;
postHandle:控制器的方法已经执行完毕,转换成视图之前的处理;
afterCompletion:视图已处理完后执行的方法,通常用于释放资源;
在MVC的配置文件中,配置拦截器与需要拦截的URL:
- <mvc:interceptors>
- <mvc:interceptor>
- <mvc:mapping path="/index.htm" />
- <bean class="com.minx.crm.web.interceptor.MyInterceptor" />
- </mvc:interceptor>
- </mvc:interceptors>
国际化:
在MVC配置文件中,配置国际化属性文件:
- <bean id="messageSource"
- class="org.springframework.context.support.ResourceBundleMessageSource"
- p:basename="message">
- </bean>
那么,Spring就会在项目中搜索相关的国际化属性文件,如:message.properties、message_zh_CN.properties
在VIEW中,引入Spring标签:<%@taglib uri="http://www.springframework.org/tags" prefix="spring" %>,使用<spring:message code="key" />调用,即可;
如果一种语言,有多个语言文件,可以更改MVC配置文件为:
- <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
- <property name="basenames">
- <list>
- <value>message01</value>
- <value>message02</value>
- <value>message03</value>
- </list>
- </property>
- </bean>
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