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 .
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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>
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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; } }
2. ServletAPI
通过设置ServletAPI , 不需要视图解析器 .
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通过HttpServletResponse进行输出
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通过HttpServletResponse实现重定向
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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); } }
3. SpringMVC
加了forward或者redirect就不走视图解析器(不加前缀和后缀)
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forward转发
- 不加forward默认为forward,走视图解析器添加前缀和后缀
- 若加上了forward,则必须写全路径名称,如
forward:/WEB-INF/jsp/hello1.jsp
// 未加forward(hello2.jsp位于/WEB-INF/jsp/目录下) @RequestMapping("/hello2") public String hello2(Model model){ model.addAttribute("msg", "hello2"); return "hello2"; } // 加forward(hello1.jsp位于/WEB-INF/jsp/目录下) @RequestMapping("/hello1") public String hello1(Model model){ model.addAttribute("msg", "hello1"); return "forward:/WEB-INF/jsp/hello1.jsp"; }
forward可以请求WEB-INF目录下的文件
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redirect重定向
重定向redirect必须要使用全路径,且不能访问WEB-INF下的内容
// index.jsp位于web目录下 @RequestMapping("/index") public String index(){ return "redirect:/index.jsp"; }