@pathvariable和@RequestParam的区别

@PathVariable 获取的是请求路径url中的值： (http://xxx.xxx.com/get_10.html，侧重于请求的URL路径里面的{xx}变量 )

//获取url中某部分的值 @RequestMapping("get_{id}")//获取到 10 

public String get(@PathVariable Integer id, Model model) {}

//测试例子 http://hcss:8090/hi1/aa bb/cc

@RequestMapping("/hi1/{a1}{a2}/{a3}")
public String showIndex1 (Model model, @PathVariable String a1,@PathVariable String a2,@PathVariable String a3,String a4) {}
//测试结果：
a1=aa bb a2="" a3="a3" a4=null

@RequestParam 获取的是url中问号后面的请求参数的值：（http://localhost:8080/Springmvc/user/page.do?pageSize=3&pageNow=2）

//获取pageSize和pageNow的值: 
@RequestMapping("page") public String page(@RequestParam int pageSize,@RequestParam int pageNow){}