java前后端分离使用注解优雅的返回实体部分属性

#第一个注解

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @Description:
 * @Author: ckk
 * @CreateDate: 2019/9/17 17:15
 */
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface JSONS {
    JSONField[] value();
}

#第二个注解

import java.lang.annotation.*;

/**
 * @Description:
 * @Author: ckk
 * @CreateDate: 2019/9/17 17:16
 */
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(JSONS.class)
public @interface JSONField {
    Class type();

    String[] include() default {""};

    String[] filter() default {""};
}

#解析器

import com.fasterxml.jackson.annotation.JsonFilter;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.BeanPropertyFilter;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.PropertyFilter;
import com.fasterxml.jackson.databind.ser.PropertyWriter;
import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;

import java.util.*;

/**
 * @Description:
 * @Author: ckk
 * @CreateDate: 2019/9/17 17:19
 */
@JsonFilter("JacksonFilter")
public class JacksonJsonFilter extends FilterProvider {
    Map, Set> includeMap = new HashMap();
    Map, Set> filterMap = new HashMap();

    public JacksonJsonFilter() {
    }

    public void include(Class type, String[] fields) {
        this.addToMap(this.includeMap, type, fields);
    }

    public void filter(Class type, String[] fields) {
        this.addToMap(this.filterMap, type, fields);
    }

    private void addToMap(Map, Set> map, Class type, String[] fields) {
        Set fieldSet = (Set) map.getOrDefault(type, new HashSet());
        fieldSet.addAll(Arrays.asList(fields));
        map.put(type, fieldSet);
    }

    public BeanPropertyFilter findFilter(Object filterId) {
        throw new UnsupportedOperationException("Access to deprecated filters not supported");
    }

    public PropertyFilter findPropertyFilter(Object filterId, Object valueToFilter) {
        return new SimpleBeanPropertyFilter() {
            public void serializeAsField(Object pojo, JsonGenerator jgen, SerializerProvider prov, PropertyWriter writer) throws Exception {
                if (JacksonJsonFilter.this.apply(pojo.getClass(), writer.getName())) {
                    writer.serializeAsField(pojo, jgen, prov);
                } else if (!jgen.canOmitFields()) {
                    writer.serializeAsOmittedField(pojo, jgen, prov);
                }

            }
        };
    }

    public boolean apply(Class type, String name) {
        Set includeFields = (Set) this.includeMap.get(type);
        Set filterFields = (Set) this.filterMap.get(type);
        if (includeFields != null && includeFields.contains(name)) {
            return true;
        } else if (filterFields != null && !filterFields.contains(name)) {
            return true;
        } else {
            return includeFields == null && filterFields == null;
        }
    }
}

序列化器

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.lang3.StringUtils;

/**
 * @Description:
 * @Author: ckk
 * @CreateDate: 2019/9/17 17:18
 */
public class CustomerJsonSerializer {
    ObjectMapper mapper = new ObjectMapper();
    JacksonJsonFilter jacksonFilter = new JacksonJsonFilter();

    public CustomerJsonSerializer() {
    }

    public void filter(Class clazz, String[] include, String[] filter) {
        if (clazz != null) {
            if (include.length > 1 || include.length == 1 && org.apache.commons.lang3.StringUtils.isNotBlank(include[0])) {
                this.jacksonFilter.include(clazz, include);
            }

            if (filter.length > 1 || filter.length == 1 && StringUtils.isNotBlank(filter[0])) {
                this.jacksonFilter.filter(clazz, filter);
            }

            this.mapper.addMixIn(clazz, this.jacksonFilter.getClass());
        }
    }

    public String toJson(Object object) throws JsonProcessingException {
        this.mapper.setFilterProvider(this.jacksonFilter);
        return this.mapper.writeValueAsString(object);
    }

    public void filter(JSONField json) {
        this.filter(json.type(), json.include(), json.filter());
    }
}

#使用方法

@ApiOperation(value = “查询详情”, response = ZcPolicyVo.class)
@GetMapping(“getById/{id}”)
@JSONS({@JSONField(type = ZcPolicyVo.class, filter = {“base_id”, “pic”, “mobilecontent”,
“synchtime”, “url”, “policy_originid”, “base_updatetime”, “tags”, “audittime”, “creator”}),
@JSONField(type = SysAreaVo.class, include = {“base_id”, “base_name”}),
@JSONField(type = SysCodeVo.class, include = {“base_id”, “base_name”}),
@JSONField(type = ZcRelationVo.class, include = {“keyId”, “keyIdName”}),
@JSONField(type = ImUsersVo.class, include = {“userid”, “username”}),
@JSONField(type = ZcCentraldeptcodeVo.class, include = {“codeId”, “codeIdName”}),
@JSONField(type = ZcLocaldeptcodeVo.class, include = {“codeId”, “codeIdName”}),
@JSONField(type = PolicyKeywordsVo.class, include = {“keyId”, “keyIdName”}),
@JSONField(type = PolicyMapKeywordsVo.class, include = {“keyId”, “keyIdName”}),
@JSONField(type = ZcKeywordVo.class, include = {“baseId”, “title”})
})
public Message getById(@PathVariable(“id”) String id) {
try {
ZcPolicy zcPolicy = zcPolicyJpaService.getObjectByPK(id);
return Message.success(BeanutilsCopy.convertBean(zcPolicy, ZcPolicyVo.class));
} catch (Exception e) {
logger.error("查询详情异常：===》 " + e);
return Message.exception(e.getMessage());
}
}

#filter：排除某些属性
#include ：包括某些属性
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