@PathVariable
當使用@RequestMapping URI template 樣式映射時,@PathVariable能使傳過來的參數綁定到路由上,這樣比較容易寫出restful api,看代碼
@RequestMapping(value="/{id}", method=RequestMethod.GET)
public List<Map<String, Object>> getUser(@PathVariable Integer id) {
return userService.getUserById(id);
}
上面這個接口可通過get請求 http://xxxxx/1111來得到想要的數據,1111既是getUser的方法參數又是@RequestMapping的路由。如果方法參數不想寫成和路由一樣的應該怎麼辦?看代碼:
@RequestMapping(value="/{uid}", method=RequestMethod.GET)
public List<Map<String, Object>> getUser(@PathVariable("uid") Integer id) {
return userService.getUserById(id);
}
在@PathVariable後面接入“uid”就可以了。
@RequestParam
@RequestParam和@PathVariable的區別就在於請求時當前參數是在url路由上還是在請求的body上,例如有下面一段代碼:
@RequestMapping(value="", method=RequestMethod.POST)
public String postUser(@RequestParam(value="phoneNum", required=true) String phoneNum ) String userName) {
userService.create(phoneNum, userName);
return "success";
}
這個接口的請求url這樣寫:http://xxxxx?phoneNum=xxxxxx,也就是說被@RequestParam修飾的參數最後通過key=value的形式放在http請求的Body傳過來,對比下上面的@PathVariable就很容易看出兩者的區別了。
@RequestBody
@RequestBody能把簡單json結構參數轉換成實體類,如下代碼:
@RequestMapping(value = "/testUser", method = RequestMethod.POST)
public String testUser(@RequestBody User user){
System.out.print(user.getAge());
return "success";
}
參數爲:
{"id":1,"user":"pkxutao","name":"name","age":18}
注意請求的content type要設置爲application/json