SpringMVC--RequestMapping

Posted 2021-02-13 彩虹！！！

一、RequestMapping映射URL

1）RequestMapping注解指定控制器能处理哪些URL请求，可用于类定义和方法定义处。

2）RequestMapping常用属性有value、params、method、headers，表示请求URL地址、请求方法、请求参数及请求头。他们之间是与的关系，复合多个条件可让请求映射精确化。

类定义

@RequestMapping(value = "/user")
public class UserController{
} 

方法定义 映射请求地址：http://127.0.0.1:8080/应用名/user/register

@RequestMapping(value = "/register", method = RequestMethod.GET)
public String register{
}

应用占位符

@RequestMapping(value = "/{formName}")
public String loginForm(@PathVariable String formName) {
		// 动态跳转页面
		return formName;
}

3）如果类定义处没有设置@RequestMapping，则方法处标记的URL相对于WEB 应用的根目录

 

二、获取请求参数

1）RequestParam，将指定名称的参数赋值变量。如果是相同名称的变量，可省略注解@RequestParam

@RequestMapping(value = "/register", method = RequestMethod.POST)
public String register(@RequestParam("loginname") String name1, @RequestParam("password") String password,@RequestParam("username") String name2) { 
		return "loginForm";
	}

2）RequestHeader，获取报文头参数

@RequestMapping(value="/test")
public void requestHeaderTest(@RequestHeader("User-Agent") String userAgent,  
		     @RequestHeader(value="Accept") String[] accepts) {
 
}

3)CookieValue

@RequestMapping(value="/cookie")
 public void cookiet(@CookieValue(value="JSESSIONID", defaultValue="") String sessionId) {
			
		 }

4)能接受原生请求参数HttpServletRequest、HttpServletResponse、InputStream、OutputStream等

@RequestMapping("download.do")
public ModelAndView download(String docNo,HttpServletRequest request,
			HttpServletResponse response) {
}

5)上传附件

@RequestMapping("upload.do")
public void upload(@RequestParam(value = "picFile", required = true)MultipartFilesoftwareFile,HttpServletRequest request) {
		String fileName = softwareFile.getOriginalFilename();
		File targetSoftwareFile = new File("D:", fileName);
		if (!targetSoftwareFile.exists()) {
			targetSoftwareFile.mkdirs();
		}
		try {
			softwareFile.transferTo(targetSoftwareFile);
		} catch (Exception e) {  
		} 

}