如何在Spring MVC中使用@RequestParam捕获多个参数？

Spring MVC中使用@RequestParam捕获多个参数

Spring MVC提供了一个@RequestParam注解，用于捕获URL中的参数，可以捕获一个参数，也可以捕获多个参数。

使用方法

• 单个参数：

  @RequestMapping(value = "/test", method = RequestMethod.GET)
  public String test(@RequestParam("param") String param) {
      System.out.println("param:" + param);
      return "success";
  }
      

• 多个参数：

  @RequestMapping(value = "/test", method = RequestMethod.GET)
  public String test(@RequestParam("param1") String param1,
                     @RequestParam("param2") String param2,
                     @RequestParam("param3") String param3) {
      System.out.println("param1:" + param1);
      System.out.println("param2:" + param2);
      System.out.println("param3:" + param3);
      return "success";
  }
      

• 可选参数：

  @RequestMapping(value = "/test", method = RequestMethod.GET)
  public String test(@RequestParam(value = "param1", required = false) String param1,
                     @RequestParam(value = "param2", required = false) String param2,
                     @RequestParam(value = "param3", required = false) String param3) {
      System.out.println("param1:" + param1);
      System.out.println("param2:" + param2);
      System.out.println("param3:" + param3);
      return "success";
  }
      

• 参数默认值：

  @RequestMapping(value = "/test", method = RequestMethod.GET)
  public String test(@RequestParam(value = "param1", defaultValue = "defaultValue") String param1,
                     @RequestParam(value = "param2", defaultValue = "defaultValue") String param2,
                     @RequestParam(value = "param3", defaultValue = "defaultValue") String param3) {
      System.out.println("param1:" + param1);
      System.out.println("param2:" + param2);
      System.out.println("param3:" + param3);
      return "success";
  }
      

使用@RequestParam注解可以很方便的捕获URL中的参数，可以捕获一个参数，也可以捕获多个参数，并且可以设置参数的可选性和默认值。