Question

springmvc怎么实现跳转

Answer 1

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12
@Controllerpublic 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12
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";
}