1) @RequestParam用于提取查询参数

http://localhost:3000/api/group/test?id=4

@GetMapping("/group/test")
public ResponseEntity<?> test(@RequestParam Long id) {
    System.out.println("This is test");
    return ResponseEntity.ok().body(id);
}

而@PathVariable用于从URI中提取数据:

http://localhost:3000/api/group/test/4

@GetMapping("/group/test/{id}")
public ResponseEntity<?> test(@PathVariable Long id) {
    System.out.println("This is test");
    return ResponseEntity.ok().body(id);
}

2) @RequestParam在传统的web应用程序中更有用，其中数据主要通过查询参数传递，而@PathVariable更适合rest式web服务，其中URL包含值。

3)如果查询参数不存在或使用defaultValue属性为空，@RequestParam注释可以指定默认值，前提是所需的属性为false:

@RestController
@RequestMapping("/home")
public class IndexController {

    @RequestMapping(value = "/name")
    String getName(@RequestParam(value = "person", defaultValue = "John") String personName) {
        return "Required element of request param";
    }

}

@RequestParam:我们可以说它是一个类似键值对的查询参数 @PathVariable:它来自URI

这两个注释的行为完全相同。

只有2个特殊字符!'和'@'被注释@ pathvariable和@ requestparam接受。

为了检查和确认行为，我创建了一个只包含1个控制器的spring引导应用程序。

 @RestController 
public class Controller 
{
    @GetMapping("/pvar/{pdata}")
    public @ResponseBody String testPathVariable(@PathVariable(name="pdata") String pathdata)
    {
        return pathdata;
    }

    @GetMapping("/rpvar")
    public @ResponseBody String testRequestParam(@RequestParam("param") String paramdata)
    {
        return paramdata;
    }
}

点击以下请求，我得到了相同的响应:

localhost: 7000 / pvar /!@#$%^&*()_+-=[]{}|;':",./<>? localhost: 7000 / rpvar ?停止 =!@#$%^&*()_+-=[]{}|;':",./<>?

在两个请求中都收到了!@作为响应

1) @RequestParam用于提取查询参数

http://localhost:3000/api/group/test?id=4

@GetMapping("/group/test")
public ResponseEntity<?> test(@RequestParam Long id) {
    System.out.println("This is test");
    return ResponseEntity.ok().body(id);
}

而@PathVariable用于从URI中提取数据:

http://localhost:3000/api/group/test/4

@GetMapping("/group/test/{id}")
public ResponseEntity<?> test(@PathVariable Long id) {
    System.out.println("This is test");
    return ResponseEntity.ok().body(id);
}

2) @RequestParam在传统的web应用程序中更有用，其中数据主要通过查询参数传递，而@PathVariable更适合rest式web服务，其中URL包含值。

3)如果查询参数不存在或使用defaultValue属性为空，@RequestParam注释可以指定默认值，前提是所需的属性为false:

@RestController
@RequestMapping("/home")
public class IndexController {

    @RequestMapping(value = "/name")
    String getName(@RequestParam(value = "person", defaultValue = "John") String personName) {
        return "Required element of request param";
    }

}

@RequestParam用于查询参数(静态值)，例如:http://localhost:8080/calculation/pow?base=2&ext=4

@PathVariable用于动态值，例如:http://localhost:8080/calculation/sqrt/8

@RequestMapping(value="/pow", method=RequestMethod.GET)
public int pow(@RequestParam(value="base") int base1, @RequestParam(value="ext") int ext1){
    int pow = (int) Math.pow(base1, ext1);
    return pow;
}

@RequestMapping("/sqrt/{num}")
public double sqrt(@PathVariable(value="num") int num1){
    double sqrtnum=Math.sqrt(num1);
    return sqrtnum;
}

@PathVariable - must be placed in the endpoint uri and access the query parameter value from the request
@RequestParam - must be passed as method parameter (optional based on the required property)
 http://localhost:8080/employee/call/7865467

 @RequestMapping(value=“/call/{callId}", method = RequestMethod.GET)
 public List<Calls> getAgentCallById(
            @PathVariable(“callId") int callId,
            @RequestParam(value = “status", required = false) String callStatus) {

    }

http://localhost:8080/app/call/7865467?status=Cancelled

@RequestMapping(value=“/call/{callId}", method = RequestMethod.GET)
public List<Calls> getAgentCallById(
            @PathVariable(“callId") int callId,
            @RequestParam(value = “status", required = true) String callStatus) {

}