SpringMVC获取请求参数的常用注解

一、      通过@PathVariabl获取路径中的参数

@RequestMapping(value="user/{id}/{name}",method=RequestMethod.GET)
    public String printMessage1(@PathVariable String id,@PathVariable String name, ModelMap model) {
        
        System.out.println(id);
        System.out.println(name);
        model.addAttribute("message", "111111");
        return "users";
    }
例如,访问user/123/lei路径时,执行以上方法,其中,参数id=123,name=lei

二、      @ModelAttribute获取POST请求的FORM表单数据

JSP表单如下

a: b:
Java  Pojo如下
    public class Pojo{
        private String a;
        private int b;
    }
Java Controller如下
@RequestMapping(method = RequestMethod.POST) 
public String processSubmit(@ModelAttribute("pojo") Pojo pojo) { 
    
    return "helloWorld"; 
}

三、      直接用HttpServletRequest获取

@RequestMapping(method = RequestMethod.GET) 
public String get(HttpServletRequest request, HttpServletResponse response) { 
   System.out.println(request.getParameter("a")); 
    return "helloWorld"; 
}

四、      用注解@RequestParam绑定请求参数

用注解@RequestParam绑定请求参数a到变量a

当请求参数a不存在时会有异常发生,可以通过设置属性required=false解决,

例如: @RequestParam(value="a", required=false)

Controller如下

@RequestMapping(value = "/requestParam", method = RequestMethod.GET) 
public String setupForm(@RequestParam("a") String a, ModelMap model) { 
   System.out.println(a); 
return "helloWorld";
}





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