之前一直对forward和redirect有点疑问，现在练习一下加深点记忆，理解理解,forward是一次请求，在一个request范围内，而redirect是二次请求
实例：
@Controller
public class ForwardController {
@RequestMapping("/makeDataForward2.html")
public String makeDataResponse(Model model,HttpServletRequest request) {
//在model和request中保存属性
model.addAttribute("modelData", "model data");
//得到完整路径
System.out.println("request.getRequestURL()"+request.getRequestURL());
//得到除去ip地址的路径
System.out.println("request.getRequestURI()"+request.getRequestURI());
request.setAttribute("requestData", "reuqest data");
//正常响应
return "success";
}
//请求转发
@RequestMapping("/makeDataForward.html")
public String makeDateForward(Model model,HttpServletRequest request) {
//在model和request中保存属性
model.addAttribute("modelData", "model data");
request.setAttribute("requestData", "reuqest data");
//请求转发过去后值也传递过去了
return "forward:toSuccessPage.html";
}
@RequestMapping("/makeDataRedirect.html")
public String makeDataRedirect(Model model, HttpServletRequest request) {
//在model和request中保存属性
model.addAttribute("modelData", "model data");
request.setAttribute("requestData", "reuqest data");
//重定向
return "redirect:toSuccessPage2.html";
}
@RequestMapping("/toSuccessPage.html")
public String toSuccessPage() {
return "success";
}
@RequestMapping("/toSuccessPage2.html")
public String toSuccessPage2(@ModelAttribute("modelData") String modelData) {
//@ModelAttribute("modelData")
//可以获取重定向传递过来的页面的model值，这样在前端就可以获取了
//如果没有这个参数，页面就获取不到值
return "success";
}
@RequestMapping("/toSuccessPage3.html")
//RedirectAttributes可以向url传递参数，包括中文
public String toSuccessPage3(RedirectAttributes redirectAttributes) {
redirectAttributes.addAttribute("param", "王");
return "redirect:/WEB-INF/jsp/success.jsp?method=号";
}
}
success.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
model中数据：${modelData}
<br/>
<br/>
request中数据：${requestData }
<br/>
</body>
</html>
原文地址：https://www.cnblogs.com/ya-qiang/p/9393147.html
时间： 2024-10-19 05:19:17