时间:2020-11-03 13:29:53 | 栏目:JAVA代码 | 点击:次
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
@Controller public class RequestController{ @RequestMapping("/resp") public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception { resp.getWriter().println("hello HttpServletResponse"); }
web.xml配置
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
dispatcher-servlet.xml主要代码
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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"> <!--作用是扫描指定包下所有的包含注解的类--> <context:component-scan base-package="com.jsu.mvc"/> </beans>
1.2 使用HttpServletResponse 重定向到另一个视图(其他不变 )
@RequestMapping("/resp") public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception { resp.sendRedirect("index.jsp"); } }
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)
@RequestMapping("/resp") public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception { req.setAttribute("message","it's forword "); req.getRequestDispatcher("index.jsp").forward(req,resp); }
1.4直接返回jsp页面的名称(无渲染器)
其他的配置不变
@RequestMapping("/nice") public String hello1(){ //转发方式1 return "home.jsp"; //转发方式2 return "forward:index.jsp"; //重定向方式 return "redirect:index.jsp"; }
1.5当有渲染器指定
@RequestMapping("/nice") public String hello1(){ //转发方式1 return "home"; //转发方式2 return "forward:index"; //重定向方式 hello指的是requsrmapping return "redirect:hello"; }
2 使用view
2.1 使用modelandview
需要视图解析器 能指定跳转页面
public class HelloController implements Controller { @Override public ModelAndView handleRequest(javax.servlet.http.HttpServletRequest httpServletRequest, javax.servlet.http.HttpServletResponse httpServletResponse) throws Exception { ModelAndView mv = new ModelAndView(); //封装要显示到视图的数据 mv.addObject("msg","hello myfirst mvc"); //视图名 mv.setViewName("hello"); return mv; } }
[servlet-name]-servlet.xml
<!--配置渲染器--> <!--配置hellocontroller中页面的位置--> <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" /> <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> <!--结果视图的前缀--> <property name="prefix" value="/WEB-INF/jsp/"/> <!--结果视图的后缀--> <property name="suffix" value=".jsp"/> </bean> <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
//通过modelmap方式 @RequestMapping("/modelmap") public String modelHello(String name,ModelMap map){ map.addAttribute("name",name); System.out.println(name); return "index.jsp"; }