Spring Boot 整合常用JSON方案

川长思鸟来 2021-11-05 13:18 364阅读 0赞

### Spring Boot整合常用JSON方案 ###

*  概要
 *  Spring Boot 整合 Jackson
 *   *  依赖
     *  在Config中引入
     *  编写测试类
     *  测试
 *  整合GSON
 *   *  修改依赖
     *  修改Config
     *  测试
 *  整合fastjson
 *   *  修改Config
     *  测试

# 概要 #

本文主要介绍如何在Spring Boot中整合几种常用的JSON方案，主要介绍Spring Boot本身提供和Jackson和GSON，以及另一种比较常用的fastjson的整合。

# Spring Boot 整合 Jackson #

Jackson是Spring Boot中默认的，所以我们不需要导入额外的依赖，只需要导入spring-boot-starter-web就可以使用了。

## 依赖 ##

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.6.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.yjn</groupId>
        <artifactId>json</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>json</name>
        <description>Demo project for Spring Boot</description>
        <properties>
            <java.version>1.8</java.version>
        </properties>
        <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>
            </dependency>
        </dependencies>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

## 在Config中引入 ##

package com.yjn.json.config;
    
    import com.fasterxml.jackson.databind.ObjectMapper;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
    
    import java.text.SimpleDateFormat;
    
    @Configuration
    public class WebMVCConfig{ 
        @Bean
        MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter(){ 
            MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
            ObjectMapper objectMapper = new ObjectMapper();
            objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd"));
            converter.setObjectMapper(objectMapper);
            return converter;
        }
    }

## 编写测试类 ##

package com.yjn.json.controller;
    
    import com.yjn.json.user.User;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.Date;
    
    @RestController
    public class UserController { 
    
        @GetMapping("/user")
        public User user(Model model){ 
                User user = new User();
                user.setId(1);
                user.setUsername("JustinNeil");
                user.setAddress("www.yjn.com");
                user.setBirthday(new Date());
            return user;
        }
    }

## 测试 ##

![在这里插入图片描述][20190807091330814.png]

# 整合GSON #

GSON也是Spring Boot中提供了自动化配置的，我们需要出去Jackson的依赖并引入GSON

## 修改依赖 ##

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.6.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.yjn</groupId>
        <artifactId>json</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>json</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-starter-json</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>com.google.code.gson</groupId>
                <artifactId>gson</artifactId>
            </dependency>
        </dependencies>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

## 修改Config ##

package com.yjn.json.config;
    
    import com.fasterxml.jackson.databind.ObjectMapper;
    import com.google.gson.Gson;
    import com.google.gson.GsonBuilder;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.http.converter.json.GsonHttpMessageConverter;
    import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
    
    import java.text.SimpleDateFormat;
    
    @Configuration
    public class WebMVCConfig{ 
        @Bean
        GsonHttpMessageConverter gsonHttpMessageConverter(){ 
            GsonHttpMessageConverter converter = new GsonHttpMessageConverter();
            converter.setGson(new GsonBuilder().setDateFormat("yyyy/MM/dd HH:mm:ss").create());
            return converter;
        }
        @Bean
        Gson gson(){ 
            return new GsonBuilder().setDateFormat("HH:mm:ss").create();
        }
    }

## 测试 ##

测试用类不需要改动  
![在这里插入图片描述][20190807092248172.png]

# 整合fastjson #

Spring Boot 中并没有提供fastjson的默认支持，所以我们需要自行导入依赖

<dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.54</version>
            </dependency>

## 修改Config ##

package com.yjn.json.config;
    
    import com.alibaba.fastjson.support.config.FastJsonConfig;
    import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
    import com.google.gson.Gson;
    import com.google.gson.GsonBuilder;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.http.converter.json.GsonHttpMessageConverter;
    
    @Configuration
    public class WebMVCConfig{ 
    
        @Bean
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter(){ 
            FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
            FastJsonConfig config = new FastJsonConfig();
            config.setDateFormat("yyyy-MM-dd HH:mm:ss");
           converter.setFastJsonConfig(config);
            return converter;
        }
    }

## 测试 ##

![在这里插入图片描述][20190807092737665.png]

[20190807091330814.png]: /images/20211105/2b095d32e3224ec4ab212e5b74a005d0.png
[20190807092248172.png]: /images/20211105/b5ccea12e60840ceb7693261b206bb30.png
[20190807092737665.png]: /images/20211105/62e0a74bdd5a4f5695ab8c71a7f3ec18.png