jackson学习之十(终篇):springboot整合(配置类)

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系列文章汇总

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

  1. 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/blog_demos):
名称 链接 备注
项目主页 https://github.com/zq2599/blog_demos 该项目在GitHub上的主页
git仓库地址(https) https://github.com/zq2599/blog_demos.git 该项目源码的仓库地址,https协议
git仓库地址(ssh) git@github.com:zq2599/blog_demos.git 该项目源码的仓库地址,ssh协议
  1. 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:

jackson学习之十(终篇):springboot整合(配置类)

  1. jacksondemo是父子结构的工程,本篇的代码在springbootconfigbean子工程中,如下图:

jackson学习之十(终篇):springboot整合(配置类)

编码

  1. 在父工程jacksondemo下新增子工程springbootconfigbean,pom.xml如下:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>jacksondemo</artifactId>
<groupId>com.bolingcavalry</groupId>
<version>1.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<groupId>com.bolingcavalry</groupId>
<artifactId>springbootconfigbean</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springbootconfigbean</name>
<description>Demo project for Spring Boot with Jackson, configuration from config bean</description> <properties>
<java.version>1.8</java.version>
</properties> <!--不用spring-boot-starter-parent作为parent时的配置-->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.3.3.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement> <dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency> <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency> <!-- swagger依赖 -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
</dependency>
<!-- swagger-ui -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
</dependency>
</dependencies> <build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build> </project>
  1. 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;
}
}
  1. 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);
} }
  1. 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", "zq2599@gmail.com"))
//版本号
.version("1.0")
//描述
.description("API 描述")
.build();
}
}
  1. 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

  1. 启动SpringbootConfigBeanApplication后,浏览器打开:http://localhost:8080/swagger-ui.html
  2. 先验证序列化接口/jsonproperty/serialization:

jackson学习之十(终篇):springboot整合(配置类)

3. 再验证反序列化接口 /jsonproperty/deserialization:

jackson学习之十(终篇):springboot整合(配置类)

  • 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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