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https://github.com/zq2599/blog_demos
内容:所有原创文章分类汇总及配套源码,涉及Java、Docker、Kubernetes、DevOPS等;
系列文章汇总
- jackson学习之一:基本信息
- jackson学习之二:jackson-core
- jackson学习之三:常用API操作
- jackson学习之四:WRAP_ROOT_VALUE(root对象)
- jackson学习之五:JsonInclude注解
- jackson学习之六:常用类注解
- jackson学习之七:常用Field注解
- jackson学习之八:常用方法注解
- jackson学习之九:springboot整合(配置文件)
- jackson学习之十(终篇):springboot整合(配置类)
本篇概览
- 本文是《jackson学习》系列的终篇,经过前面的一系列实战,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,那么,本篇就以轻松的方式来完成整个系列吧;
- 上一篇介绍的是在springboot中通过配置文件对jackson做设置,今天要聊的是另一种常用的jackson配置方式:配置类,就是自己编写代码实例化和配置springboot全局使用的ObjectMapper实例;
源码下载
- 如果您不想编码,可以在GitHub下载所有源码,地址和链接信息如下表所示(https://github.com/zq2599/blo...:
名称 | 链接 | 备注 |
---|---|---|
项目主页 | https://github.com/zq2599/blo... | 该项目在GitHub上的主页 |
git仓库地址(https) | https://github.com/zq2599/blo... | 该项目源码的仓库地址,https协议 |
git仓库地址(ssh) | [email protected]:zq2599/blog_demos.git | 该项目源码的仓库地址,ssh协议 |
- 这个git项目中有多个文件夹,本章的应用在jacksondemo文件夹下,如下图红框所示:
- jacksondemo是父子结构的工程,本篇的代码在springbootconfigbean子工程中,如下图:
编码
- 在父工程jacksondemo下新增子工程springbootconfigbean,pom.xml如下:
4.0.0
jacksondemo
com.bolingcavalry
1.0-SNAPSHOT
../pom.xml
com.bolingcavalry
springbootconfigbean
0.0.1-SNAPSHOT
springbootconfigbean
Demo project for Spring Boot with Jackson, configuration from config bean
1.8
org.springframework.boot
spring-boot-dependencies
2.3.3.RELEASE
pom
import
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
org.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,如下,需要ConditionalOnMissingBean注解避免冲突,另外还给实例指定了名称customizeObjectMapper,如果应用中通过Autowired使用此实例,需要指定这个名字,避免报错"There is more than one bean of 'ObjectMapper ' type":
@Configuration
public class JacksonConfig {
@Bean("customizeObjectMapper")
@Primary
@ConditionalOnMissingBean(ObjectMapper.class)
public ObjectMapper getObjectMapper(Jackson2ObjectMapperBuilder builder) {
ObjectMapper mapper = 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;
}
}
- 对于JacksonConfig.getObjectMapper方法内的设置,如果您想做更多设置,请参考《jackson学习之三:常用API操作》里面的设置内容;
- 启动类依然很简单:
package com.bolingcavalry.springbootconfigbean;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringbootConfigBeanApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootConfigBeanApplication.class, args);
}
}
- swagger配置:
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;
@Configuration
@EnableSwagger2
public class SwaggerConfig {
@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", "[email protected]"))
//版本号
.version("1.0")
//描述
.description("API 描述")
.build();
}
}
- 最后是测试用的Controller类,要注意的是在使用ObjectMapper实例的地方,用Autowired注解的时候,记得带上Qualifier注解:
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;
@RestController
@RequestMapping("/jsonproperty")
@Api(tags = {"JsonPropertySerializationController"})
public class JsonPropertySerializationController {
private static final Logger logger = LoggerFactory.getLogger(JsonPropertySerializationController.class);
@Qualifier("customizeObjectMapper")
@Autowired
ObjectMapper mapper;
@ApiOperation(value = "测试序列化", notes = "测试序列化")
@RequestMapping(value = "/serialization", method = RequestMethod.GET)
public Test serialization() throws JsonProcessingException {
Test test = new Test();
logger.info(mapper.writeValueAsString(test));
return test;
}
@ApiOperation(value = "测试反序列化", notes="测试反序列化")
@RequestMapping(value = "/deserialization",method = RequestMethod.PUT)
public String deserialization(@RequestBody Test test) {
return test.toString();
}
}
验证
- 启动SpringbootConfigBeanApplication后,浏览器打开:http://localhost:8080/swagger-ui.html
- 先验证序列化接口/jsonproperty/serialization:
- 再验证反序列化接口 /jsonproperty/deserialization:
- 至此,整个《jackson学习》系列就全部完成了,希望这十篇内容能够给您带来一些参考,助您在编码过程中更加得心应手的使用Jackson;
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