对于单参数方法， 一直喜欢用parameter方式。今天不知道为啥，就想用Json方式，然后无法直接传递。各种自我怀疑，然后尝试。

突然醒悟过来，Json方式是key/value模式，单参数String类型，没有key。必须记录一下脑残的实验

@PostMapping("/say")

public String sayHello0(@RequestParam String name) {

System.out.println("input value:" + name);

return "hi " + name;

}

@PostMapping("/hash")

public String sayHello1(@RequestBody String name) {

System.out.println("input value:" + name);

return "hi " + name;

}

@PostMapping("/json")

public String sayHello2(@RequestBody JSONObject job) {

System.out.println("input value:" + job.getString("name"));

return "hi " + job.getString("name");

}

@PostMapping("/prop")

public String sayHello2(@RequestBody Properties job) {

System.out.println("input value:" + job.getProperty("name"));

return "hi " + job.getProperty("name");

}