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这里分类和汇总了欣宸的全部原创(含配套源码)：
https://github.com/zq2599/blog_demos
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
- 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：
<?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>
- 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;
}
}
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);
}
}
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();
}
}
- 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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