1.簡單參數接收
前端請求參數與Controller接受變量名一致
如果參數名不一致,接受不成功。
可以用@RequestParam指定參數名,可以用username接收(不推薦)。
required = true,表示參數必須傳遞,如果不傳遞會報錯,false代表可選的參數,可以不傳遞
@RequestMapping("/simplePara")public String simplePara(@RequestParam(name="name",required = false) String username, Integer age){System.out.println(username+":"+age);return "OK";}
## 2.實體參數接收
請求參數名與形參對象屬性名相同
@RequestMapping("/simplePojo")public String simplePojo(User user){System.out.println(user);return "OK";}
3.復雜實體參數接收
@RequestMapping("/complexPojo")public String complexPojo(User user){System.out.println(user);return "OK";}
4.數組參數接收
@RequestMapping("/arrayPara")public String arrayPara(String[] hobby){System.out.println(Arrays.toString(hobby));return "OK";}
5.集合接收
- 請求參數名hobby與 集合變量名相同hobby
- 加上@RequestParam
```java
@RequestMapping(“/listPara”)
public String listPara(@RequestParam List hobby){
System.out.println(hobby);
return “OK”;
}
``
6.日期參數接收
- 后端要使用@DateTimeFormat注解標記參數
- 后端接收要指定接收日期的格式(與前端傳遞的格式一樣):yyyy-MM-dd HH:mm:ss
@RequestMapping("/dataParam")public String dataParam(@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") LocalDateTime updateTime){System.out.println(updateTime);return "OK";}
7.Json格式參數接收
- 后端通過實體對象接收數據
- 請求參數需要用@RequestBody 標記
@RequestMapping("/jsonParam")public String jsonParam(@RequestBody User user){System.out.println(user);return "OK";}
8.路徑參數,參數已經是url的一部分\
- {id}是個路徑參數
- 參數需要用@PathVariable 標記
@RequestMapping("/pathParam/{id}")public String pathParam(@PathVariable Integer id){System.out.println(id);return "OK";}//多個路徑參數@RequestMapping("/pathParam2/{id}/{name}")public String pathParam(@PathVariable Integer id,@PathVariable String name){System.out.println(id + ":" + name);return "OK";}
總結
常用注解
每個接口返回的數據有各種類型(字符串,數組,Json),不規范
可以用Result封裝返回的數據
-
響應字符串請求
-
響應json請求
-
響應集合請求
-
public class Result {private Integer code ;//1 成功 , 0 失敗private String msg; //提示信息private Object data; //數據 datapublic Result() {}public Result(Integer code, String msg, Object data) {this.code = code;this.msg = msg;this.data = data;}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public Object getData() {return data;}public void setData(Object data) {this.data = data;}public static Result success(Object data){return new Result(1, "success", data);}public static Result success(){return new Result(1, "success", null);}public static Result error(String msg){return new Result(0, msg, null);}@Overridepublic String toString() {return "Result{" +"code=" + code +", msg='" + msg + '\'' +", data=" + data +'}';}
}
請求處理代碼
@RestController
public class ResponseController {//統一相應結果@RequestMapping("/hello")public Result hello(){System.out.println("Hello World ~");//return new Result(1,"success","Hello World ~");return Result.success("Hello World ~");}@RequestMapping("/getAddr")public Result getAddr(){Address addr = new Address();addr.setProvince("廣東");addr.setCity("深圳");return Result.success(addr);}@RequestMapping("/listAddr")public Result listAddr(){List<Address> list = new ArrayList<>();Address addr = new Address();addr.setProvince("廣東");addr.setCity("深圳");Address addr2 = new Address();addr2.setProvince("陜西");addr2.setCity("西安");list.add(addr);list.add(addr2);return Result.success(list);}
}