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自定义null值序列化处理器、配置jackson实体

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dimengzhe
2022-04-29 19:47:27 +08:00
parent a82c0300d7
commit 5ed3cbd421
3 changed files with 156 additions and 7 deletions
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72
yxt-common/yxt-common-base/src/main/java/com/yxt/common/base/config/CustomizeNullJsonSerializer.java Normal file
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@@ -0,0 +1,72 @@
package com.yxt.common.base.config;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import java.io.IOException;
/**
* @Author dimengzhe
* @Date 2022/4/29 18:59
* @Description
*/
public class CustomizeNullJsonSerializer {
/**
* 处理数组集合类型的null值
*/
public static class NullArrayJsonSerializer extends JsonSerializer<Object> {
@Override
public void serialize(Object value, JsonGenerator jsonGenerator,
SerializerProvider serializerProvider) throws IOException {
jsonGenerator.writeStartArray();
jsonGenerator.writeEndArray();
}
}
/**
* 处理字符串类型的null值
*/
public static class NullStringJsonSerializer extends JsonSerializer<Object> {
@Override
public void serialize(Object value, JsonGenerator jsonGenerator,
SerializerProvider serializerProvider) throws IOException {
jsonGenerator.writeString("");
}
}
/**
* 处理数值类型的null值
*/
public static class NullNumberJsonSerializer extends JsonSerializer<Object> {
@Override
public void serialize(Object value, JsonGenerator jsonGenerator,
SerializerProvider serializerProvider) throws IOException {
jsonGenerator.writeNumber(0);
}
}
/**
* 处理boolean类型的null值
*/
public static class NullBooleanJsonSerializer extends JsonSerializer<Object> {
@Override
public void serialize(Object value, JsonGenerator jsonGenerator,
SerializerProvider serializerProvider) throws IOException {
jsonGenerator.writeBoolean(false);
}
}
/**
* 处理实体对象类型的null值
*/
/* public static class NullObjectJsonSerializer extends JsonSerializer<Object> {
@Override
public void serialize(Object value, JsonGenerator jsonGenerator,
SerializerProvider serializerProvider) throws IOException {
jsonGenerator.writeStartObject();
jsonGenerator.writeEndObject();
}
}*/
}

23
yxt-common/yxt-common-base/src/main/java/com/yxt/common/base/config/JacksonConfig.java
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@@ -25,10 +25,6 @@
*********************************************************/
package com.yxt.common.base.config;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -37,8 +33,6 @@ import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import java.io.IOException;
/**
* Project: yxt-common <br/>
* File: JacksonConfig.java <br/>
@@ -54,7 +48,7 @@ import java.io.IOException;
*/
@Configuration
public class JacksonConfig {
@Bean
/* @Bean
@Primary
@ConditionalOnMissingBean(ObjectMapper.class)
public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
@@ -68,6 +62,21 @@ public class JacksonConfig {
}
});
return objectMapper;
}*/
@Bean
@Primary
@ConditionalOnMissingBean(ObjectMapper.class)
public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
ObjectMapper objectMapper = builder.createXmlMapper(false).build();
/** 为objectMapper注册一个带有SerializerModifier的Factory */
objectMapper.setSerializerFactory(objectMapper.getSerializerFactory()
.withSerializerModifier(new MyBeanSerializerModifier()));
SerializerProvider serializerProvider = objectMapper.getSerializerProvider();
// serializerProvider.setNullValueSerializer(new CustomizeNullJsonSerializer
// .NullObjectJsonSerializer());
return objectMapper;
}
}

68
yxt-common/yxt-common-base/src/main/java/com/yxt/common/base/config/MyBeanSerializerModifier.java Normal file
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@@ -0,0 +1,68 @@
package com.yxt.common.base.config;
import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.SerializationConfig;
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
import com.fasterxml.jackson.databind.ser.BeanSerializerModifier;
import java.util.Collection;
import java.util.List;
/**
* @Author dimengzhe
* @Date 2022/4/29 18:58
* @Description
*/
public class MyBeanSerializerModifier extends BeanSerializerModifier {
@Override
public List<BeanPropertyWriter> changeProperties(SerializationConfig config,
BeanDescription beanDesc,
List<BeanPropertyWriter> beanProperties) {
// 循环所有的beanPropertyWriter
for (int i = 0; i < beanProperties.size(); i++) {
BeanPropertyWriter writer = beanProperties.get(i);
// 判断字段的类型，如果是数组或集合则注册nullSerializer
/* if (isArrayType(writer)) {
// 给writer注册一个自己的nullSerializer
writer.assignNullSerializer(new CustomizeNullJsonSerializer.NullArrayJsonSerializer());
}*/
if (isStringType(writer)) {
writer.assignNullSerializer(new CustomizeNullJsonSerializer.NullStringJsonSerializer());
}
}
return beanProperties;
}
/**
* 是否是数组
*/
private boolean isArrayType(BeanPropertyWriter writer) {
Class<?> clazz = writer.getType().getRawClass();
return clazz.isArray() || Collection.class.isAssignableFrom(clazz);
}
/**
* 是否是String
*/
private boolean isStringType(BeanPropertyWriter writer) {
Class<?> clazz = writer.getType().getRawClass();
return CharSequence.class.isAssignableFrom(clazz) || Character.class.isAssignableFrom(clazz);
}
/**
* 是否是数值类型
*/
private boolean isNumberType(BeanPropertyWriter writer) {
Class<?> clazz = writer.getType().getRawClass();
return Number.class.isAssignableFrom(clazz);
}
/**
* 是否是boolean
*/
private boolean isBooleanType(BeanPropertyWriter writer) {
Class<?> clazz = writer.getType().getRawClass();
return clazz.equals(Boolean.class);
}
}