自SpringMVC4.2之后，RequestParam内部有4个参数：
1、String name;
2、String value;
3、boolean required;
4、String defaultValue;
源码中name的别名是value，value的别名是name,
所以说name和value两个属性基本是等价的,都是获取从前台传入的参数
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RequestParam来映射请求参数
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required表示是否必须,默认为true
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defaultValue请求参数的默认值
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@RequestMapping(value = "/testRequestParam")
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public String testRequestParam(@RequestParam(value="username")String un,@RequestParam(value = "age",required = false,defaultValue = "0") int age){
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System.out.println("testRequestParam,username:"+un+",age,"+age);
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return "success";
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}
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