6. SpringBoot中Json串处理

SpringBoot中的Json字符串处理

1.0 统一响应结果集

SpringBoot 项目主要作用于前后端分离项目，为了方便前后端进行数据交互，我们需要统一后端的返回数据格式，封装出一个统一框架响应状态码和统一响应类

/**
 * Constants enumerating the HTTP status codes.
 * All status codes defined in RFC1945 (HTTP/1.0), RFC2616 (HTTP/1.1), and
 * RFC2518 (WebDAV) are listed.
 *
 * @since 4.0
 */
public interface HttpStatus {

    // --- 1xx Informational ---

    /**
     * {@code 100 Continue} (HTTP/1.1 - RFC 2616)
     */
    int SC_CONTINUE = 100;
    /**
     * {@code 101 Switching Protocols} (HTTP/1.1 - RFC 2616)
     */
    int SC_SWITCHING_PROTOCOLS = 101;
    /**
     * {@code 102 Processing} (WebDAV - RFC 2518)
     */
    int SC_PROCESSING = 102;

    // --- 2xx Success ---

    /**
     * {@code 200 OK} (HTTP/1.0 - RFC 1945)
     */
    int SC_OK = 200;
    /**
     * {@code 201 Created} (HTTP/1.0 - RFC 1945)
     */
    int SC_CREATED = 201;
    /**
     * {@code 202 Accepted} (HTTP/1.0 - RFC 1945)
     */
    int SC_ACCEPTED = 202;
    /**
     * {@code 203 Non Authoritative Information} (HTTP/1.1 - RFC 2616)
     */
    int SC_NON_AUTHORITATIVE_INFORMATION = 203;
    /**
     * {@code 204 No Content} (HTTP/1.0 - RFC 1945)
     */
    int SC_NO_CONTENT = 204;
    /**
     * {@code 205 Reset Content} (HTTP/1.1 - RFC 2616)
     */
    int SC_RESET_CONTENT = 205;
    /**
     * {@code 206 Partial Content} (HTTP/1.1 - RFC 2616)
     */
    int SC_PARTIAL_CONTENT = 206;
    /**
     * {@code 207 Multi-Status} (WebDAV - RFC 2518)
     * or
     * {@code 207 Partial Update OK} (HTTP/1.1 - draft-ietf-http-v11-spec-rev-01?)
     */
    int SC_MULTI_STATUS = 207;

    // --- 3xx Redirection ---

    /**
     * {@code 300 Mutliple Choices} (HTTP/1.1 - RFC 2616)
     */
    int SC_MULTIPLE_CHOICES = 300;
    /**
     * {@code 301 Moved Permanently} (HTTP/1.0 - RFC 1945)
     */
    int SC_MOVED_PERMANENTLY = 301;
    /**
     * {@code 302 Moved Temporarily} (Sometimes {@code Found}) (HTTP/1.0 - RFC 1945)
     */
    int SC_MOVED_TEMPORARILY = 302;
    /**
     * {@code 303 See Other} (HTTP/1.1 - RFC 2616)
     */
    int SC_SEE_OTHER = 303;
    /**
     * {@code 304 Not Modified} (HTTP/1.0 - RFC 1945)
     */
    int SC_NOT_MODIFIED = 304;
    /**
     * {@code 305 Use Proxy} (HTTP/1.1 - RFC 2616)
     */
    int SC_USE_PROXY = 305;
    /**
     * {@code 307 Temporary Redirect} (HTTP/1.1 - RFC 2616)
     */
    int SC_TEMPORARY_REDIRECT = 307;

    // --- 4xx Client Error ---

    /**
     * {@code 400 Bad Request} (HTTP/1.1 - RFC 2616)
     */
    int SC_BAD_REQUEST = 400;
    /**
     * {@code 401 Unauthorized} (HTTP/1.0 - RFC 1945)
     */
    int SC_UNAUTHORIZED = 401;
    /**
     * {@code 402 Payment Required} (HTTP/1.1 - RFC 2616)
     */
    int SC_PAYMENT_REQUIRED = 402;
    /**
     * {@code 403 Forbidden} (HTTP/1.0 - RFC 1945)
     */
    int SC_FORBIDDEN = 403;
    /**
     * {@code 404 Not Found} (HTTP/1.0 - RFC 1945)
     */
    int SC_NOT_FOUND = 404;
    /**
     * {@code 405 Method Not Allowed} (HTTP/1.1 - RFC 2616)
     */
    int SC_METHOD_NOT_ALLOWED = 405;
    /**
     * {@code 406 Not Acceptable} (HTTP/1.1 - RFC 2616)
     */
    int SC_NOT_ACCEPTABLE = 406;
    /**
     * {@code 407 Proxy Authentication Required} (HTTP/1.1 - RFC 2616)
     */
    int SC_PROXY_AUTHENTICATION_REQUIRED = 407;
    /**
     * {@code 408 Request Timeout} (HTTP/1.1 - RFC 2616)
     */
    int SC_REQUEST_TIMEOUT = 408;
    /**
     * {@code 409 Conflict} (HTTP/1.1 - RFC 2616)
     */
    int SC_CONFLICT = 409;
    /**
     * {@code 410 Gone} (HTTP/1.1 - RFC 2616)
     */
    int SC_GONE = 410;
    /**
     * {@code 411 Length Required} (HTTP/1.1 - RFC 2616)
     */
    int SC_LENGTH_REQUIRED = 411;
    /**
     * {@code 412 Precondition Failed} (HTTP/1.1 - RFC 2616)
     */
    int SC_PRECONDITION_FAILED = 412;
    /**
     * {@code 413 Request Entity Too Large} (HTTP/1.1 - RFC 2616)
     */
    int SC_REQUEST_TOO_LONG = 413;
    /**
     * {@code 414 Request-URI Too Long} (HTTP/1.1 - RFC 2616)
     */
    int SC_REQUEST_URI_TOO_LONG = 414;
    /**
     * {@code 415 Unsupported Media Type} (HTTP/1.1 - RFC 2616)
     */
    int SC_UNSUPPORTED_MEDIA_TYPE = 415;
    /**
     * {@code 416 Requested Range Not Satisfiable} (HTTP/1.1 - RFC 2616)
     */
    int SC_REQUESTED_RANGE_NOT_SATISFIABLE = 416;
    /**
     * {@code 417 Expectation Failed} (HTTP/1.1 - RFC 2616)
     */
    int SC_EXPECTATION_FAILED = 417;

    /**
     * Static constant for a 418 error.
     * {@code 418 Unprocessable Entity} (WebDAV drafts?)
     * or {@code 418 Reauthentication Required} (HTTP/1.1 drafts?)
     */
    // not used
    //  int SC_UNPROCESSABLE_ENTITY = 418;

    /**
     * Static constant for a 419 error.
     * {@code 419 Insufficient Space on Resource}
     * (WebDAV - draft-ietf-webdav-protocol-05?)
     * or {@code 419 Proxy Reauthentication Required}
     * (HTTP/1.1 drafts?)
     */
    int SC_INSUFFICIENT_SPACE_ON_RESOURCE = 419;
    /**
     * Static constant for a 420 error.
     * {@code 420 Method Failure}
     * (WebDAV - draft-ietf-webdav-protocol-05?)
     */
    int SC_METHOD_FAILURE = 420;
    /**
     * {@code 422 Unprocessable Entity} (WebDAV - RFC 2518)
     */
    int SC_UNPROCESSABLE_ENTITY = 422;
    /**
     * {@code 423 Locked} (WebDAV - RFC 2518)
     */
    int SC_LOCKED = 423;
    /**
     * {@code 424 Failed Dependency} (WebDAV - RFC 2518)
     */
    int SC_FAILED_DEPENDENCY = 424;

    // --- 5xx Server Error ---

    /**
     * {@code 500 Server Error} (HTTP/1.0 - RFC 1945)
     */
    int SC_INTERNAL_SERVER_ERROR = 500;
    /**
     * {@code 501 Not Implemented} (HTTP/1.0 - RFC 1945)
     */
    int SC_NOT_IMPLEMENTED = 501;
    /**
     * {@code 502 Bad Gateway} (HTTP/1.0 - RFC 1945)
     */
    int SC_BAD_GATEWAY = 502;
    /**
     * {@code 503 Service Unavailable} (HTTP/1.0 - RFC 1945)
     */
    int SC_SERVICE_UNAVAILABLE = 503;
    /**
     * {@code 504 Gateway Timeout} (HTTP/1.1 - RFC 2616)
     */
    int SC_GATEWAY_TIMEOUT = 504;
    /**
     * {@code 505 HTTP Version Not Supported} (HTTP/1.1 - RFC 2616)
     */
    int SC_HTTP_VERSION_NOT_SUPPORTED = 505;

    /**
     * {@code 507 Insufficient Storage} (WebDAV - RFC 2518)
     */
    int SC_INSUFFICIENT_STORAGE = 507;

    /**
     * --------------------------------------------------
     * 系统自己定义响应码
     */
    // int SC_VALID_EXCEPTION = 1000;

}

import lombok.Data;
import java.util.List;

/**
 * 统一响应类
 */
@Data
public class HttpResult {
    private int code = 200;
    private String msg;
    private Object data;

    public static HttpResult error() {
        return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, "未知异常，请联系管理员");
    }

    public static HttpResult error(String msg) {
        return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, msg);
    }

    public static HttpResult error(int code, String msg) {
        HttpResult r = new HttpResult();
        r.setCode(code);
        r.setMsg(msg);
        return r;
    }
    public static HttpResult error(List<String> errorList){
        HttpResult r = new HttpResult();
        r.setData(errorList);
        r.setCode(1000);
        return r;
    }

    public static HttpResult ok(String msg) {
        HttpResult r = new HttpResult();
        r.setMsg(msg);
        return r;
    }

    public static HttpResult ok(Object data) {
        HttpResult r = new HttpResult();
        r.setData(data);
        return r;
    }

    public static HttpResult ok() {
        return new HttpResult();
    }

}

2.0 处理日期时间格式

@JsonFormat主要是后台到前台的时间格式的转换，序列化

@DateTimeFormat主要是前后到后台的时间格式的转换，反序列化

2.1 注解式

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")

2.2 全局配置式（实体类必须实现可序列化）

spring:
  mvc:
    date-format: yyyy-MM-dd HH:mm:ss
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss