jackson学习之十(终篇)：springboot整合(配置类)

野性酷女 2022-12-06 12:39 173阅读 0赞

### 欢迎访问我的GitHub ###

> 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][https_github.com_zq2599_blog_demos]

### 系列文章汇总 ###

*  [jackson学习之一：基本信息][jackson]
 *  [jackson学习之二：jackson-core][jackson_jackson-core]
 *  [jackson学习之三：常用API操作][jackson_API]
 *  [jackson学习之四：WRAP\_ROOT\_VALUE（root对象）][jackson_WRAP_ROOT_VALUE_root]
 *  [jackson学习之五：JsonInclude注解][jackson_JsonInclude]
 *  [jackson学习之六：常用类注解][jackson 1]
 *  [jackson学习之七：常用Field注解][jackson_Field]
 *  [jackson学习之八：常用方法注解][jackson 2]
 *  [jackson学习之九：springboot整合(配置文件)][jackson_springboot]
 *  [jackson学习之十(终篇)：springboot整合(配置类)][jackson_springboot 1]

### 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)：

<table> 
 <thead> 
  <tr> 
   <th align="left">名称</th> 
   <th align="left">链接</th> 
   <th align="left">备注</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="left">项目主页</td> 
   <td align="left">https://github.com/zq2599/blog_demos</td> 
   <td align="left">该项目在GitHub上的主页</td> 
  </tr> 
  <tr> 
   <td align="left">git仓库地址(https)</td> 
   <td align="left">https://github.com/zq2599/blog_demos.git</td> 
   <td align="left">该项目源码的仓库地址，https协议</td> 
  </tr> 
  <tr> 
   <td align="left">git仓库地址(ssh)</td> 
   <td align="left">git@github.com:zq2599/blog_demos.git</td> 
   <td align="left">该项目源码的仓库地址，ssh协议</td> 
  </tr> 
 </tbody> 
</table>

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：  
    ![在这里插入图片描述][2020090516314153.png_pic_center]
2.  jacksondemo是父子结构的工程，本篇的代码在springbootconfigbean子工程中，如下图：  
    ![在这里插入图片描述][20200913110748824.jpg_pic_center]

### 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>
    
        
        <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>
    
            
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger2</artifactId>
            </dependency>
            
            <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》][jackson_API 1]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：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JvbGluZ19jYXZhbHJ5_size_16_color_FFFFFF_t_70_pic_center]
3.  再验证反序列化接口 /jsonproperty/deserialization：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JvbGluZ19jYXZhbHJ5_size_16_color_FFFFFF_t_70_pic_center 1]

*  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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[https_github.com_zq2599_blog_demos]: https://github.com/zq2599/blog_demos
[jackson]: https://blog.csdn.net/boling_cavalry/article/details/107135958
[jackson_jackson-core]: https://blog.csdn.net/boling_cavalry/article/details/108571629
[jackson_API]: https://blog.csdn.net/boling_cavalry/article/details/108192174
[jackson_WRAP_ROOT_VALUE_root]: https://blog.csdn.net/boling_cavalry/article/details/108298858
[jackson_JsonInclude]: https://blog.csdn.net/boling_cavalry/article/details/108412558
[jackson 1]: https://blog.csdn.net/boling_cavalry/article/details/108333324
[jackson_Field]: https://blog.csdn.net/boling_cavalry/article/details/108589494
[jackson 2]: https://blog.csdn.net/boling_cavalry/article/details/108433330
[jackson_springboot]: https://blog.csdn.net/boling_cavalry/article/details/108460433
[jackson_springboot 1]: https://blog.csdn.net/boling_cavalry/article/details/108559056
[2020090516314153.png_pic_center]: /images/20221123/523ecf39eb864bc4985cfe8ee750ae49.png
[20200913110748824.jpg_pic_center]: /images/20221123/c8532b58507c4f34b3cca10e15f6187b.png
[jackson_API 1]: https://xinchen.blog.csdn.net/article/details/108192174
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JvbGluZ19jYXZhbHJ5_size_16_color_FFFFFF_t_70_pic_center]: /images/20221123/7b36cb0a4838470695c188759b7b7dcd.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JvbGluZ19jYXZhbHJ5_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20221123/db54c0c26a224484ae1998d854a198e1.png