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内容&＃xff1a;所有原创文章分类和汇总&＃xff0c;及配套源码&＃xff0c;涉及Java、Docker、Kubernetes、DevOPS等&＃xff1b;

本篇概览

• 本文是《jackson学习》系列的终篇&＃xff0c;经过前面的一系列实战&＃xff0c;相信您已可以熟练使用jackson灵活的执行各种json序列化和反序列化操作&＃xff0c;那么&＃xff0c;本篇就以轻松的方式来完成整个系列吧&＃xff1b;
• 上一篇《jackson学习之九&＃xff1a;springboot整合(配置文件) 》介绍的是在springboot中通过配置文件对jackson做设置&＃xff0c;今天要聊的是另一种常用的jackson配置方式&＃xff1a;配置类&＃xff0c;就是自己编写代码配置springboot全局使用的ObjectMapper实例&＃xff1b;

源码下载

如果您不想编码&＃xff0c;可以在GitHub下载所有源码&＃xff0c;地址和链接信息如下表所示(
https://github.com/zq2599/blog_demos)&＃xff1a;

• 这个git项目中有多个文件夹&＃xff0c;本章的应用在jacksondemo文件夹下&＃xff0c;如下图红框所示&＃xff1a;

• jacksondemo是父子结构的工程&＃xff0c;本篇的代码在springbootproperties子工程中&＃xff0c;如下图&＃xff1a;

编码

• 在父工程jacksondemo下新增子工程springbootconfigbean&＃xff0c;pom.xml如下&＃xff1a;

4.0.0 jacksondemo com.bolingcavalry1.0-SNAPSHOT../pom.xmlcom.bolingcavalry springbootconfigbean 0.0.1-SNAPSHOTspringbootconfigbeanDemo project for Spring Boot with Jackson, configuration from config bean1.8org.springframework.boot spring-boot-dependencies 2.3.3.RELEASEpomimportorg.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test testorg.junit.vintage junit-vintage-engine io.springfox springfox-swagger2 io.springfox springfox-swagger-ui org.springframework.boot spring-boot-maven-plugin

• 本文最重要的代码是配置类JacksonConfig.java&＃xff0c;如下&＃xff0c;需要ConditionalOnMissingBean注解避免冲突&＃xff0c;另外还给实例指定了名称customizeObjectMapper&＃xff0c;如果应用中通过Autowired使用此实例&＃xff0c;需要指定这个名字&＃xff0c;避免报错"There is more than one bean of &＃39;ObjectMapper ’ type"&＃xff1a;

&＃64;Configurationpublic class JacksonConfig { &＃64;Bean("customizeObjectMapper") &＃64;Primary &＃64;ConditionalOnMissingBean(ObjectMapper.class) public ObjectMapper getObjectMapper(Jackson2ObjectMapperBuilder builder) { ObjectMapper mapper &＃61; builder.build(); // 日期格式 mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd hh:mm:ss")); // 美化输出 mapper.enable(SerializationFeature.INDENT_OUTPUT); return mapper; }}123456789101112131415161718

• 对于JacksonConfig.getObjectMapper方法内的设置&＃xff0c;如果您想做更多设置&＃xff0c;请参考《jackson学习之三&＃xff1a;常用API 》里面的设置内容&＃xff1b;
• 启动类依然很简单&＃xff1a;

package com.bolingcavalry.springbootconfigbean;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;&＃64;SpringBootApplicationpublic class SpringbootConfigBeanApplication { public static void main(String[] args) { SpringApplication.run(SpringbootConfigBeanApplication.class, args); }}

• swagger配置&＃xff1a;

package com.bolingcavalry.springbootconfigbean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import springfox.documentation.builders.ApiInfoBuilder;import springfox.documentation.builders.PathSelectors;import springfox.documentation.builders.RequestHandlerSelectors;import springfox.documentation.service.ApiInfo;import springfox.documentation.service.Contact;import springfox.documentation.service.Tag;import springfox.documentation.spi.DocumentationType;import springfox.documentation.spring.web.plugins.Docket;import springfox.documentation.swagger2.annotations.EnableSwagger2;&＃64;Configuration&＃64;EnableSwagger2public class SwaggerConfig { &＃64;Bean public Docket createRestApi() { return new Docket(DocumentationType.SWAGGER_2) .apiInfo(apiInfo()) .tags(new Tag("JsonPropertySerializationController", "JsonProperty相关测试")) .select() // 当前包路径 .apis(RequestHandlerSelectors.basePackage("com.bolingcavalry.springbootconfigbean.controller")) .paths(PathSelectors.any()) .build(); } //构建 api文档的详细信息函数,注意这里的注解引用的是哪个 private ApiInfo apiInfo() { return new ApiInfoBuilder() //页面标题 .title("SpringBoot整合Jackson(基于配置文件)") //创建人 .contact(new Contact("程序员欣宸", "https://github.com/zq2599/blog_demos", "zq2599&＃64;gmail.com")) //版本号 .version("1.0") //描述 .description("API 描述") .build(); }}

• 最后是测试用的Controller类&＃xff0c;要注意的是在使用ObjectMapper实例的地方&＃xff0c;用Autowired注解的时候&＃xff0c;记得带上Qualifier注解&＃xff1a;

package com.bolingcavalry.springbootconfigbean.controller;import com.bolingcavalry.springbootconfigbean.bean.Test;import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.databind.ObjectMapper;import io.swagger.annotations.Api;import io.swagger.annotations.ApiOperation;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;&＃64;RestController&＃64;RequestMapping("/jsonproperty")&＃64;Api(tags &＃61; {"JsonPropertySerializationController"})public class JsonPropertySerializationController { private static final Logger logger &＃61; LoggerFactory.getLogger(JsonPropertySerializationController.class); &＃64;Qualifier("customizeObjectMapper") &＃64;Autowired ObjectMapper mapper; &＃64;ApiOperation(value &＃61; "测试序列化", notes &＃61; "测试序列化") &＃64;RequestMapping(value &＃61; "/serialization", method &＃61; RequestMethod.GET) public Test serialization() throws JsonProcessingException { Test test &＃61; new Test(); logger.info(mapper.writeValueAsString(test)); return test; } &＃64;ApiOperation(value &＃61; "测试反序列化", notes&＃61;"测试反序列化") &＃64;RequestMapping(value &＃61; "/deserialization",method &＃61; RequestMethod.PUT) public String deserialization(&＃64;RequestBody Test test) { return test.toString(); }}

验证

• 启动SpringbootConfigBeanApplication后&＃xff0c;浏览器打开&＃xff1a;http://localhost:8080/swagger-ui.html
• 先验证序列化接口/jsonproperty/serialization&＃xff1a;

• 再验证反序列化接口 /jsonproperty/deserialization&＃xff1a;

jackson系列全文结束

• 至此&＃xff0c;整个《jackson学习》系列就全部完成了&＃xff0c;希望这十篇内容能够给您带来一些参考&＃xff0c;助您在编码过程中更加得心应手的使用Jackson&＃xff1b;

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