Question

springMvc请求的跳转和传值的方法

Answer 1

1. 几种页面跳转方式
1.1 通过HttpServletResponse的API直接输出（不需要配置渲染器）
案例： @Controller
public class RequestController{
@RequestMapping("/resp")
public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {
resp.getWriter().println("hello HttpServletResponse");
}
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）
@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 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;
}
}
<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>
1.6
//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";
}
2.传值
使用Map类型来向前台传递数据
使用modelAndView向前台传递数据