springmvc请求参数获取的几种方法

[b]方法一：[/b]

通过@PathVariabl注解获取路径中传递参数

JAVA

@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");
}

方法二：

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

<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

public class Pojo{
private String a;
private int b;
}

JAVA controller

@RequestMapping(method = RequestMethod.POST)
public String processSubmit(@ModelAttribute("pojo") Pojo pojo) {
return "helloWorld";
}

[b]方法三：[/b]

直接用HttpServletRequest获取
JAVA

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

[b]方法四：[/b]

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

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