SpringBoot自定义返回code值

关于HttpStatus

在SpringBoot中关于状态码有一个枚举类型，如下。

public enum HttpStatus {
    CONTINUE(100, "Continue"),
    SWITCHING_PROTOCOLS(101, "Switching Protocols"),
    PROCESSING(102, "Processing"),
    CHECKPOINT(103, "Checkpoint"),
    OK(200, "OK"),
    ...
}

通过以下三种方法均可实现

1. 通过@ResponseStatus注解

eg：

@ResponseStatus(code=HttpStatus.INTERNAL_SERVER_ERROR,reason="server error")
public class ServerException extends Exception {
	...
}

在全局异常捕捉的类中定义，可以自定义特定的异常来返回特定的状态码。

2. 修改response的status属性

eg：

@RequestMapping(value = "/index", method = RequestMethod.GET)
public void index(HttpServletResponse response) throws IOException{
    response.setStatus(500);
    response.getWriter().append("server error");
}

需要多加response参数，但这样的控制器都必须为void，有诸多限制。

3. ResponseEntity

eg：

@RequestMapping(value = "/user", method = RequestMethod.GET)
public ResponseEntity<Map<String,Object>> getUser() throws IOException{
    Map<String,Object> map = new HashMap<String,Object>();
    map.put("name", "user");
    return new ResponseEntity<Map<String,Object>>(map,HttpStatus.OK);
}

这样返回类型就只能是ResponseEntity。

---

前后端分离开发一般都会自定义返回的数据格式。
都会包含msg,code,data三个属性。
可用上述思路实现以下工具类。实现自定义返回的状态码，需将返回格式设置为以下类的格式，将返回数据传入data。

JSONResult.java

public class JSONResult<T> extends ResponseEntity<Message> {

    public JSONResult(HttpStatus status) {
        super(status);
    }

    public JSONResult(String code, String msg, T data) {
        super(Message.custom(code, msg, data), Message.num2HttpStatus(code));
    }

    public JSONResult(String code, String msg) {
        super(Message.custom(code, msg), Message.num2HttpStatus(code));
    }

    public static <T> JSONResult<T> success(T data) {
        return new JSONResult("200", "成功", data);
    }

    public static <T> JSONResult<T> failed(T data) {
        return new JSONResult("422", "失败", data);
    }

    public static <T> JSONResult<T> failMsg(String msg) {
        return new JSONResult("422", msg);
    }

    public static <T> JSONResult<T> custom(String code, String msg, T data) {
        return new JSONResult(code, msg, data);
    }
}

class Message<T> {

    String status;
    //向前端返回的内容
    String message;

    T data;

    public Message() {
    }

    public Message(String status, String message) {
        this.status = status;
        this.message = message;
    }

    public Message(String status, String message, T data) {
        this.data = data;
        this.status = status;
        this.message = message;
    }

    public static <T> Message<T> custom(String status, String message, T data) {
        return new Message(status, message, data);
    }

    public static <T> Message<T> custom(String status, String message) {
        return new Message(status, message);
    }

    public static HttpStatus num2HttpStatus(String code) {
        HttpStatus status = HttpStatus.NOT_FOUND;
        for (HttpStatus httpStatus : HttpStatus.values()) {
            boolean b = Integer.parseInt(code) == httpStatus.value();
            if (b) {
                return httpStatus;
            }
        }
        return status;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

}

 

通过继承ResponseEntity类来实现自定义返回类的自定义状态码返回。

#@Le.Hao#

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本文地址：https://blog.csdn.net/qq_18432653/article/details/110792336