前面已经了解了Controller的几种配置方式

今天主要写一下响应界面跳转的几种方式

1.在注解的方式中

1.1通过HttpServletResponse的API直接输出(不需要配置渲染器)

controller类的主要代码



1 @Controller
2 public class RequestController{
3 @RequestMapping("/resp")
4 public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {
5
6 resp.getWriter().println("hello HttpServletResponse");
7
8 }


web.xml配置



1 <?xml version="1.0" encoding="UTF-8"?>
2 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
5 version="3.1">
6
7 <servlet>
8 <servlet-name>dispatcher</servlet-name>
9 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
10 <load-on-startup>1</load-on-startup>
11 </servlet>
12 <servlet-mapping>
13 <servlet-name>dispatcher</servlet-name>
14 <url-pattern>/</url-pattern>
15 </servlet-mapping>
16 </web-app>


 

dispatcher-servlet.xml主要代码



1 <beans xmlns="http://www.springframework.org/schema/beans"
2 xmlns:context="http://www.springframework.org/schema/context"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="
5 http://www.springframework.org/schema/beans
6 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
7 http://www.springframework.org/schema/context
8 http://www.springframework.org/schema/context/spring-context-3.0.xsd">
9
10 <!--作用是扫描指定包下所有的包含注解的类-->
11 <context:component-scan base-package="com.jsu.mvc"/>
12
13 </beans>


 

1.2 使用HttpServletResponse 重定向到另一个视图(其他不变 )



1     @RequestMapping("/resp")
2 public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {
3
4 resp.sendRedirect("index.jsp");
5
6 }
7 }


1.3 使用HttpServletRequest 转发(默认访问/下的index.jsp页面 不受渲染器的影响)



1 @RequestMapping("/resp")
2 public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {
3 req.setAttribute("message","it's forword ");
4 req.getRequestDispatcher("index.jsp").forward(req,resp);
5 }


 

1.4直接返回jsp页面的名称(无渲染器)

其他的配置不变



1   @RequestMapping("/nice")
2 public String hello1(){
3 //转发方式1
4 return "home.jsp";
5 //转发方式2
6 return "forward:index.jsp";
7 //重定向方式
8 return "redirect:index.jsp";
9 }


 

1.5当有渲染器指定



1  @RequestMapping("/nice")
2 public String hello1(){
3 //转发方式1
4 return "home";
5 //转发方式2
6 return "forward:index";
7 //重定向方式 hello指的是requsrmapping
8 return "redirect:hello";
9 }


 

2 使用view

2.1 使用modelandview

需要视图解析器 能指定跳转页面



1 public class HelloController implements Controller {
2
3
4 @Override
5 public ModelAndView handleRequest(javax.servlet.http.HttpServletRequest httpServletRequest,
6 javax.servlet.http.HttpServletResponse httpServletResponse) throws Exception {
7
8 ModelAndView mv = new ModelAndView();
9 //封装要显示到视图的数据
10 mv.addObject("msg","hello myfirst mvc");
11 //视图名
12 mv.setViewName("hello");
13 return mv;
14
15 }
16 }


[servlet-name]-servlet.xml



1 <!--配置渲染器-->
2 <!--配置hellocontroller中页面的位置-->
3
4 <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
5 <bean id="viewResolver"
6 class="org.springframework.web.servlet.view.UrlBasedViewResolver">
7 <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
8 <!--结果视图的前缀-->
9 <property name="prefix" value="/WEB-INF/jsp/"/>
10 <!--结果视图的后缀-->
11 <property name="suffix" value=".jsp"/>
12 </bean>
13 <bean name="/hello.do" class="com.jsu.mvc.HelloController"></bean>


 

2.2 使用modelview

不需要视图解析器 不能指定跳转页面



1 //通过modelmap方式
2 @RequestMapping("/modelmap")
3 public String modelHello(String name,ModelMap map){
4 map.addAttribute("name",name);
5 System.out.println(name);
6
7 return "index.jsp";
8 }