springmvc请求接收参数的几种方法

通过@PathVariabl注解获取路径中传递参数

JAVA

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@RequestMapping(value= " /{id}/{str} " )

public ModelAndView helloWorld(@PathVariable String id, @PathVariable String str) {

System.out.println(id);

System.out.println(str);

return new ModelAndView( " /helloWorld " );

}

用@ModelAttribute注解获取POST请求的FORM表单数据
JSP

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<form method="post" action="hao.do">

a: <input id="a" type="text" name="a"/>

b: <input id="b" type="text" name="b"/>

<input type="submit" value="Submit" />

</form>

JAVA pojo

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public class Pojo{

private String a;

private int b;

JAVA controller

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@RequestMapping(method= RequestMethod.POST)

public String processSubmit(@ModelAttribute( " pojo " ) Pojo pojo) {

return " helloWorld " ;

}

直接用HttpServletRequest获取
JAVA

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@RequestMapping(method= RequestMethod.GET)

public String get(HttpServletRequest request, HttpServletResponse response) {

System.out.println(request.getParameter( " a " ));

return " helloWorld " ;

}

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)
JAVA

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@RequestMapping(value= " /requestParam " , method= RequestMethod.GET)

public String setupForm(@RequestParam( " a " ) String a, ModelMap model) {

System.out.println(a);

return " helloWorld " ;}