Spring MVC

MVC的xml配置

<!--配置组件扫描 -->

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

<!—启用MVC默认配置 (@RequestMapping) -->

<mvc:annotation-driven/>

<!-- 配置视图解析器 -->

<bean  id="viewResolver"   class="org.springframework.web.servlet.view.InternalResourceViewResolver">

     <property name="prefix" value="/WEB-INF/pages/"/>//前端控制器

     <property name="suffix" value=".jsp"/>//配置返回的页面的后缀

</bean>

打开web.xml，配置DispatcherServlet对象

<servlet>

     <servlet-name>dispatcherServlet</servlet-name>

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

     <init-param>

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

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

     </init-param>

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

  </servlet>

  <servlet-mapping>

     <servlet-name>dispatcherServlet</servlet-name>

     <url-pattern>*.do</url-pattern>

  </servlet-mapping>

Rest风格url映射

@RequestMapping("/msg/{xxx}")

请求的URL可以是“/msg/hello”或“/msg/welcome”

借助@RequestMapping注解中的method属性指定具体的请求处理方式

@RequestMapping(value=”doSaveObj”,

method=RequestMethod.POST)

public String doSaveObject(Object obj){….}

通过@PathVariable注解指定参数变量var获取请求url中{var}数据

@RequestMapping(value="path/{var}",method=RequestMethod.GET)

@ResponseBody

public String withPathVariable(@PathVariable String var) {

　　return "Obtained 'var' path variable value '" + var + "'";

}

当方法中直接返回一个页面时，默认执行的是请求转发，假如需要实现重定向,

可以在返回的地址后添加redirect, 

@RequestMapping("doResponse02")

public String doResponse02(HttpServletRequest request) {

　　request.setAttribute("data", "hello..");

　　return "redirect:responseUI.do";

}