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5、结果跳转方式

5.1、ModelAndView

设置ModelAndView对象 , 根据view的名称 , 和视图解析器跳到指定的页面 .

页面 : {视图解析器前缀} + viewName +{视图解析器后缀}

<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"id="internalResourceViewResolver"><!-- 前缀 --><property name="prefix" value="/WEB-INF/jsp/" /><!-- 后缀 --><property name="suffix" value=".jsp" />
</bean>

对应的controller类

public class ControllerTest1 implements Controller {public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {//返回一个模型视图对象ModelAndView mv = new ModelAndView();mv.addObject("msg","ControllerTest1");mv.setViewName("test");return mv;}
}

5.2、ServletAPI

通过设置ServletAPI , 不需要视图解析器 .

1. 通过HttpServletResponse进行输出
2. 通过HttpServletResponse实现重定向
3. 通过HttpServletResponse实现转发

@Controller
public class ResultGo {@RequestMapping("/result/t1")public void test1(HttpServletRequest req, HttpServletResponse rsp) throws IOException {rsp.getWriter().println("Hello,Spring BY servlet API");}@RequestMapping("/result/t2")public void test2(HttpServletRequest req, HttpServletResponse rsp) throws IOException {rsp.sendRedirect("/index.jsp");}@RequestMapping("/result/t3")public void test3(HttpServletRequest req, HttpServletResponse rsp) throws Exception {//转发req.setAttribute("msg","/result/t3");req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,rsp);}
}

5.3、SpringMVC

通过SpringMVC来实现转发和重定向 - 无需视图解析器；

测试前，需要将视图解析器注释掉

@Controller
public class ResultSpringMVC {@RequestMapping("/rsm/t1")public String test1(){//转发return "/index.jsp";}@RequestMapping("/rsm/t2")public String test2(){//转发二return "forward:/index.jsp";}@RequestMapping("/rsm/t3")public String test3(){//重定向return "redirect:/index.jsp";}
}

通过SpringMVC来实现转发和重定向 - 有视图解析器；

重定向 , 不需要视图解析器 , 本质就是重新请求一个新地方嘛 , 所以注意路径问题.

可以重定向到另外一个请求实现 .

@Controller
public class ResultSpringMVC2 {@RequestMapping("/rsm2/t1")public String test1(){//转发return "test";}@RequestMapping("/rsm2/t2")public String test2(){//重定向return "redirect:/index.jsp";//return "redirect:hello.do"; //hello.do为另一个请求/}
}