objectMaaper 反序列化json字段多于或少于实体处理

两种方式

1 忽略json上未知的字段

设置实体类注解

@JsonIgnoreProperties(ignoreUnknown = true)

public class Foo {
    ...
}

2 配置objectMapper

public static <T> T JsonNode2Entity(JsonNode node,Class t ,boolean throwErr) throws RuntimeException {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true);  //忽略大小写
        objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);      //json 为SNAKE_CASE  实体为lowerCase Camel
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);  //对未知的属性不处理
        try {
            return (T) objectMapper.readValue(node.toString(), t);

        } catch (java.lang.Exception e) {
            e.printStackTrace();
            if(throwErr){
                //ThrowWarnning(ErrorCode.Err_ParseParam);
                throw new RuntimeException("参数解析失败");
            }
            return null;
        }
    }

例:
snake_case json

{
    "context": {
        "year": "2019"
    },
    "data": {
        "GDXMZD_CZZD_GDCZLB_TITL": "项目明细",
        "GDXMZD_SFWY": "0",
        "GDXMZD_KFXG": "0",
        "GDXMZD_LBID": "%",
        "GDXMZD_XMXZ": "0",
        "GDXMZD_XMMC": "新增的项目",
        "GDXMZD_KFBG": "0",
        "GDXMZD_GSSM": null,
        "GDXMZD_QJY": "",
        "CREATOR": "admin",
        "LASTMODIFIER": "admin",
        "GDXMZD_CZZD_GDCZLB_CZZD": "vo",
        "ID": "40282e816d15be06016d15c259650000",
        "GDXMZD_XMLX": "C",
        "GDXMZD_KPMX": "1",
        "GDXMZD_JSXS": "0",
        "GDXMZD_JSGS": null,
        "GDXMZD_SFBT": "0",
        "GDXMZD_XSSX": 98,
        "GDXMZD_CZZD": "xmmx",
        "GDXMZD_DECN": 0,
        "GDXMZD_XMBH": "GDZCZY_XM01",
        "GDXMZD_IFENUM": "0",
        "GDXMZD_LENG": "888",
        "GDXMZD_IFCZ": "1",
        "GDXMZD_IFPUB": "0"
    }
}

转换的实体

@Data
@Entity
@DynamicInsert
@DynamicUpdate

@Table(name = "figdxmzd2019")
public class GDXMZD {
    @Id
    @GenericGenerator(name = "uuid",strategy = "uuid")
    @GeneratedValue(generator = "uuid")
    @Column(name = "id", nullable = false, length = 36)
    public String id;
    @Column(name = "gdxmzd_lbid", nullable = false, length = 36)
    public String gdxmzdLbid;
    @Column(name = "gdxmzd_xmbh", nullable = false, length = 60)
    public String gdxmzdXmbh;
    @Column(name = "gdxmzd_xmmc", nullable = false, length = 60)
    public String gdxmzdXmmc;
    @Column(name = "gdxmzd_xmlx", nullable = false, length = -1)
    public String gdxmzdXmlx;
    @Column(name = "gdxmzd_xmxz", nullable = false, length = -1)
    public String gdxmzdXmxz;
    @Column(name = "gdxmzd_jsgs", length = 1000)
    public String gdxmzdJsgs;
    @Column(name = "gdxmzd_gssm", length = 1000)
    public String gdxmzdGssm;
    @Column(name = "gdxmzd_xssx", length = 3)
    public int gdxmzdXssx;
    @Column(name = "gdxmzd_leng", nullable = false)
    public int gdxmzdLeng;
    @Column(name = "gdxmzd_decn", nullable = false)
    public int gdxmzdDecn;
    @Column(name = "gdxmzd_ifpub", nullable = false, length = -1)
    public String gdxmzdIfpub;
    @Column(name = "gdxmzd_kpmx", nullable = false, length = -1)
    public String gdxmzdKpmx;
    @Column(name = "gdxmzd_kfbg", nullable = false, length = -1)
    public String gdxmzdKfbg;
    @Column(name = "gdxmzd_sfbt", nullable = false, length = -1)
    public String gdxmzdSfbt;
    @Column(name = "gdxmzd_kfxg", nullable = false, length = -1)
    public String gdxmzdKfxg;
    @Column(name = "gdxmzd_ifcz", nullable = false, length = -1)
    public String gdxmzdIfcz;
    @Column(name = "gdxmzd_czzd", nullable = false, length = 20)
    public String gdxmzdCzzd;
    @Column(name = "gdxmzd_ifenum", nullable = false, length = -1)
    public String gdxmzdIfenum;
    @Column(name = "gdxmzd_jsxs", nullable = false, length = -1)
    public String gdxmzdJsxs;
    @Column(name = "gdxmzd_sfwy", nullable = false, length = -1)
    public String gdxmzdSfwy;
    @Column(name = "gdxmzd_qjy", nullable = false, length = -1)
    public String gdxmzdQjy;
    @Column(name = "createdtime")
    public LocalDateTime createdtime;
    @Column(name = "lastmodifiedtime")
    public LocalDateTime lastmodifiedtime;
    @Column(name = "lastmodifier", length = 128)
    public String lastmodifier;
    @Column(name = "creator", length = 128)
    public String creator;

    public  GDXMZD(){}

    public GDXMZD(String xmbh){
        this.gdxmzdXmbh=xmbh;
    }

    @PrePersist
    protected void onCreate() {
        createdtime = CAFContext.current.getCurrentDateTime();
        creator = CAFContext.current.getUserId();
    }

    @PreUpdate
    protected void onUpdate() {
        lastmodifiedtime = CAFContext.current.getCurrentDateTime();
        lastmodifier = CAFContext.current.getUserId();
    }

}

反向转换(序列化)

 ObjectMapper m = new ObjectMapper();
        m.setPropertyNamingStrategy(new UpperSnakCasePropertyNamingStrategy());
        m.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true);
        try {
            m.writeValue(System.out, gdxmzdRepository.findAll());
        } catch (IOException e) {
            e.printStackTrace();
        }

参考:

1 https://stackoverflow.com/questions/5455014/ignoring-new-fields-on-json-objects-using-jackson