springboot之整合jackson

springboot默认配置json转换工具就是jackson, 本文介绍自定义各种配置的方法, 废话不多说 直接上代码

配置文件:

#jackson
#日期格式化
spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
#spring.jackson.date-format=yyyy-MM-dd
#格式化输出 
spring.jackson.serialization.indent_output=true
#忽略无法转换的对象
spring.jackson.serialization.fail_on_empty_beans=false
#设置空如何序列化
spring.jackson.defaultPropertyInclusion=NON_EMPTY
#允许对象忽略json中不存在的属性
spring.jackson.deserialization.fail_on_unknown_properties=false
#允许出现特殊字符和转义符
spring.jackson.parser.allow_unquoted_control_chars=true
#允许出现单引号
spring.jackson.parser.allow_single_quotes=true

创建bean

package com.bus365.root.config;

import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

import com.fasterxml.jackson.databind.ObjectMapper;

@Configuration
public class JacksonConfig {

	@Bean
	@Primary
	@ConditionalOnMissingBean(ObjectMapper.class)
	public ObjectMapper getObjectMapper(Jackson2ObjectMapperBuilder builder) {
		ObjectMapper om = builder.build();
		return om;
	}

}

这就将 objectmapper 交给springboot管理了, 别的模块可以实现自动注入, 注意这个 objectmapper 必须是由 Jackson2ObjectMapperBuilder 创建出来的, 否则不能使用到配置文件;

另外可以在配置类中修改objectmapper 的属性  修改过后的配置类为:

package com.bus365.root.config;

import java.io.IOException;

import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;

@Configuration
public class JacksonConfig {

	@Bean
	@Primary
	@ConditionalOnMissingBean(ObjectMapper.class)
	public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
		ObjectMapper objectMapper = builder.createXmlMapper(false).build();

		objectMapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);

		objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
		objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);
		objectMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
		objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer