JAVA重定向的几种方法

朴灿烈づ我的快乐病毒、 2022-12-06 04:16 676阅读 0赞

**1.通过ModelAndView跳转**

@RequestMapping("redirect")
    public ModelAndView redirect(HttpServletRequest req, HttpServletResponse resp) throws Exception { 
            String contNo =req.getParameter("contNo");
            logger.info("访问www.baidu.com");
            String url = "redirect:http://www.baidu.com/downloadRequestElecCont.action?contNo="+contNo;
            return new ModelAndView(url);
        }

**2.通过HttpServletResponse跳转**

@RequestMapping("redirect/{contNo}")
    public void redirect(@PathVariable("contNo") String contNo, HttpServletRequest req, HttpServletResponse resp) throws Exception { 
     //String contNo =req.getParameter("contNo"); //保单号
     logger.info("访问www.baidu.com");
     resp.sendRedirect("redirect:http://www.baidu.com//downloadRequestElecCont.action?contNo="+contNo);
    }

**3.通过redirect返回String类型跳转**  
*注意：这种方法不允许Spring控制器用@RestController注解，因为@RestController相当于类中的所有方法都标注了@ResponseBody，这些方法不会返回一个视图，而是返回一个json对象，这样的话只是在页面上打印出字符串，而不跳转。控制器用@Controller注解即可*

@RequestMapping("redirect")
    public String redirect(@RequestParam("contNo") String contNo, HttpServletRequest      req, HttpServletResponse resp) throws Exception { 
     //String contNo =req.getParameter("contNo"); //保单号
     logger.info("访问www.baidu.com");
     return "redirect:http://www.baidu.com/downloadRequestElecCont.action?contNo="+contNo;
    }

**关于传参问题**  
重定向传参为get方式，如果传参数较多，可以封装到map或modelMap中

@RequestMapping(params = "action=redirect")
    public String redirect(Map modelMap){ 
      modelMap.put("userName", "呵呵");
      modelMap.put("password", "123456");
      modelMap.put("age", "25");
      return "redirect:http://localhost:8088/era/user/alipayforward4?modelMap="+modelMap;
    }

@RequestMapping("redirect")
    public void redirect(User user, HttpServletRequest req) throws Exception { 
      System.out.println(user.getPassword());
      String modelMap = req.getParameter("modelMap");
      System.out.println(modelMap);
    }