Springboot整合Json（Jackson，Gson，FastJson）

我会带着你远行 2023-10-14 23:04 127阅读 0赞

#### 文章目录 ####

*  springboot整合json有三种方式,springboot默认是使用jackson的，如果要使用其他两种，要排除掉jackson
 *   *  1.springboot整合jackson
     *   *  1.1 pom.xml
         *  1.2 实体类,jackson注解的使用
         *  1.3 controller
         *  1.4 jackson全局配置
     *  2.springboot整合gson
     *   *  2.1 pom.xml
         *  2.2 实体类
         *  2.3 controller
         *  2.4 gson的全局配置方式
         *   *  2.4.1 application.\[properties\](https://so.csdn.net/so/search?q=properties&spm=1001.2101.3001.7020)
             *  2.4.2 通过配置文件，提供一个GsonBuilder或者转换器的Bean
     *  3.springboot整合fastjson
     *   *  3.1 pom.xml
         *  3.2 实体类
         *  3.3 controller
         *  3.4 fastjson的配置
     *  3.总结

## springboot整合json有三种方式,springboot默认是使用jackson的，如果要使用其他两种，要排除掉jackson ##

### 1.springboot整合jackson ###

#### 1.1 pom.xml ####

<?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>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.5.4</version>
            <relativePath/> 
        </parent>
        <groupId>com.yl</groupId>
        <artifactId>springbootjackson</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>springbootjackson</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>

#### 1.2 实体类,jackson注解的使用 ####

package com.yl.springbootjackson.model;
    
    import com.fasterxml.jackson.annotation.*;
    
    import java.util.Date;
    
    //序列化/反序列化时批量忽略属性
    @JsonIgnoreProperties({
        "score","message"})
    public class User {
        
        @JsonProperty(index = 92)
        private String name;
        //序列化/反序列化时忽略某一个属性
        @JsonIgnore
        private Integer sex;
        //指定属性序列化/反序列化时的名称，默认就是属性名,value指定新的属性名，index主要用于排序
        @JsonProperty(value = "aage",index = 91)
        //类似于JsonProperty中的index，用于排序
        //@JsonPropertyOrder()
        private int age;
        @JsonProperty(index = 90)
        //日期格式化，注意时区问题
        @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone = "Asia/Shanghai")
        private Date birth;
        @JsonProperty(index = 89)
        private Integer score;
        @JsonProperty(index = 88)
        private String message;
    
    
        public String getName() {
        
            return name;
        }
    
        public void setName(String name) {
        
            this.name = name;
        }
    
        public int getAge() {
        
            return age;
        }
    
        public void setAge(int age) {
        
            this.age = age;
        }
    
        public Date getBirth() {
        
            return birth;
        }
    
        public void setBirth(Date birth) {
        
            this.birth = birth;
        }
    
        @Override
        public String toString() {
        
            return "User{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    ", birth=" + birth +
                    '}';
        }
    }

#### 1.3 controller ####

package com.yl.springbootjackson.controller;
    
    import com.yl.springbootjackson.model.User;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.Date;
    
    @RestController
    public class UserController {
        
    
        @GetMapping("/getUser")
        public User getUser() {
        
            User user = new User();
            user.setName("小兰");
            user.setAge(19);
            user.setBirth(new Date());
            return user;
        }
    
        @PostMapping("/save")
        public void save(@RequestBody User user) {
        
            System.out.println(user);
        }
    
     }

#### 1.4 jackson全局配置 ####

package com.yl.springbootjackson.config;
    
    import com.fasterxml.jackson.databind.ObjectMapper;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    import java.text.SimpleDateFormat;
    
    /**
     * jackson全局配置方式,注入ObjectMapper即可
     */
    @Configuration
    public class WebMVCConfig {
        
        @Bean
        ObjectMapper objectMapper() {
        
            ObjectMapper objectMapper = new ObjectMapper();
            objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
            return objectMapper;
        }
    }

### 2.springboot整合gson ###

#### 2.1 pom.xml ####

<?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>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.5.4</version>
            <relativePath/> 
        </parent>
        <groupId>com.yl</groupId>
        <artifactId>springbootgson</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>springbootgson</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>com.google.code.gson</groupId>
                <artifactId>gson</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>

#### 2.2 实体类 ####

package com.yl.springbootgson.model;
    
    import com.google.gson.annotations.Expose;
    
    import java.util.Date;
    
    public class User {
        
        @Expose
        private String name;
        @Expose
        private Date birth;
    
        public String getName() {
        
            return name;
        }
    
        public void setName(String name) {
        
            this.name = name;
        }
    
        public Date getBirth() {
        
            return birth;
        }
    
        public void setBirth(Date birth) {
        
            this.birth = birth;
        }
    }

#### 2.3 controller ####

package com.yl.springbootgson.controller;
    
    import com.yl.springbootgson.model.User;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.Date;
    
    @RestController
    public class UserController {
        
    
        @GetMapping("/getUser")
        public User getUser() {
        
            User user = new User();
            user.setName("小南");
            user.setBirth(new Date());
            return user;
        }
    }

#### 2.4 gson的全局配置方式 ####

##### 2.4.1 application.[properties][] #####

spring.gson.date-format=yyyy-MM-dd HH:mm:ss
    # 是否禁用HTML的转义字符
    spring.gson.disable-html-escaping=true
    # 序列化时是否排除内部类
    spring.gson.disable-inner-class-serialization=false
    # 序列化时是否弃用复杂映射键
    spring.gson.enable-complex-map-key-serialization=
    # 是否排除没有@Expose注解的字段
    spring.gson.exclude-fields-without-expose-annotation=true
    # 序列化时字段名的命名策略
    spring.gson.field-naming-policy=lower_case_with_underscores
    # 在输出之前添加一些特殊的的文本来生成一个不可执行的json
    spring.gson.generate-non-executable-json=
    # 是否序列化空字段
    spring.gson.serialize-nulls=false

##### 2.4.2 通过配置文件，提供一个GsonBuilder或者转换器的Bean #####

package com.yl.springbootgson.config;
    
    import com.google.gson.GsonBuilder;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    /**
     * 自定义一个GsonBuilder,配置一些gson的属性
     */
    @Configuration
    public class WebMVCConfig {
        
        @Bean
        GsonBuilder gsonBuilder() {
        
            GsonBuilder gsonBuilder = new GsonBuilder();
            gsonBuilder.setDateFormat("yyyy-MM-dd");
            return gsonBuilder;
        }
    }

### 3.springboot整合fastjson ###

#### 3.1 pom.xml ####

<?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>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.5.4</version>
            <relativePath/> 
        </parent>
        <groupId>com.yl</groupId>
        <artifactId>fastjson</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>fastjson</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>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.75</version>
            </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>

#### 3.2 实体类 ####

package com.yl.fastjson.model;
    
    import java.util.Date;
    
    public class User {
        
        private String name;
        private Date birth;
        private Integer sex;
    
        public String getName() {
        
            return name;
        }
    
        public void setName(String name) {
        
            this.name = name;
        }
    
        public Date getBirth() {
        
            return birth;
        }
    
        public void setBirth(Date birth) {
        
            this.birth = birth;
        }
    
        public Integer getSex() {
        
            return sex;
        }
    
        public void setSex(Integer sex) {
        
            this.sex = sex;
        }
    }

#### 3.3 controller ####

package com.yl.fastjson.controller;
    
    import com.yl.fastjson.model.User;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.Date;
    
    @RestController
    public class UserController {
        
    
        @GetMapping("/getUser")
        public User user() {
        
            User user = new User();
            user.setName("小白");
            user.setBirth(new Date());
            user.setSex(0);
            return user;
        }
    }

#### 3.4 fastjson的配置 ####

package com.yl.fastjson.config;
    
    import com.alibaba.fastjson.serializer.SerializerFeature;
    import com.alibaba.fastjson.support.config.FastJsonConfig;
    import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.http.MediaType;
    import org.springframework.http.converter.HttpMessageConverter;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    import java.nio.charset.Charset;
    import java.util.ArrayList;
    import java.util.List;
    
    /**
     * fastjson如果想要使用，必须提供一个Converter
     */
    @Configuration
    public class WebMvcConfig implements WebMvcConfigurer {
        
    
        //方式一：继承WebMvcConfigurer，重写configureMessageConverters，将converter添加到converters中
        @Override
        public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        
            FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
            List supportedMediaTypes = new ArrayList<>();
            supportedMediaTypes.add(MediaType.APPLICATION_JSON);
            supportedMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
            supportedMediaTypes.add(MediaType.APPLICATION_ATOM_XML);
            supportedMediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);
            supportedMediaTypes.add(MediaType.APPLICATION_OCTET_STREAM);
            supportedMediaTypes.add(MediaType.APPLICATION_PDF);
            supportedMediaTypes.add(MediaType.APPLICATION_RSS_XML);
            supportedMediaTypes.add(MediaType.APPLICATION_XHTML_XML);
            supportedMediaTypes.add(MediaType.APPLICATION_XML);
            supportedMediaTypes.add(MediaType.IMAGE_GIF);
            supportedMediaTypes.add(MediaType.IMAGE_JPEG);
            supportedMediaTypes.add(MediaType.IMAGE_PNG);
            supportedMediaTypes.add(MediaType.TEXT_EVENT_STREAM);
            supportedMediaTypes.add(MediaType.TEXT_HTML);
            supportedMediaTypes.add(MediaType.TEXT_MARKDOWN);
            supportedMediaTypes.add(MediaType.TEXT_PLAIN);
            supportedMediaTypes.add(MediaType.TEXT_XML);
            converter.setSupportedMediaTypes(supportedMediaTypes);
            FastJsonConfig config = converter.getFastJsonConfig();
            config.setCharset(Charset.forName("UTF-8"));
            config.setDateFormat("yyyy-MM-dd HH:mm:ss");
            config.setSerializerFeatures(SerializerFeature.PrettyFormat, SerializerFeature.WriteClassName);
            converter.setFastJsonConfig(config);
            converter.setDefaultCharset(Charset.forName("UTF-8"));
            converters.add(converter);
        }
    
        //方式二：注册一个Bean
    //    @Bean
    //    FastJsonHttpMessageConverter fastJsonHttpMessageConverter() {
        
    //        FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
    //        List supportedMediaTypes = new ArrayList<>();
    //        supportedMediaTypes.add(MediaType.APPLICATION_JSON);
    //        supportedMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
    //        supportedMediaTypes.add(MediaType.APPLICATION_ATOM_XML);
    //        supportedMediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);
    //        supportedMediaTypes.add(MediaType.APPLICATION_OCTET_STREAM);
    //        supportedMediaTypes.add(MediaType.APPLICATION_PDF);
    //        supportedMediaTypes.add(MediaType.APPLICATION_RSS_XML);
    //        supportedMediaTypes.add(MediaType.APPLICATION_XHTML_XML);
    //        supportedMediaTypes.add(MediaType.APPLICATION_XML);
    //        supportedMediaTypes.add(MediaType.IMAGE_GIF);
    //        supportedMediaTypes.add(MediaType.IMAGE_JPEG);
    //        supportedMediaTypes.add(MediaType.IMAGE_PNG);
    //        supportedMediaTypes.add(MediaType.TEXT_EVENT_STREAM);
    //        supportedMediaTypes.add(MediaType.TEXT_HTML);
    //        supportedMediaTypes.add(MediaType.TEXT_MARKDOWN);
    //        supportedMediaTypes.add(MediaType.TEXT_PLAIN);
    //        supportedMediaTypes.add(MediaType.TEXT_XML);
    //        converter.setSupportedMediaTypes(supportedMediaTypes);
    //        FastJsonConfig config = converter.getFastJsonConfig();
    //        config.setCharset(Charset.forName("UTF-8"));
    //        config.setDateFormat("yyyy-MM-dd HH:mm:ss");
    //        config.setSerializerFeatures(SerializerFeature.PrettyFormat, SerializerFeature.WriteClassName);
    //        converter.setFastJsonConfig(config);
    //        converter.setDefaultCharset(Charset.forName("UTF-8"));
    //        return converter;
    //    }
    }

### 3.总结 ###

3.1springboot默认是使用jackson的，对jackson和gson都做了自动配置，所以一般使用这两者之一即可。如果非得要fastjson，那么必须将FastJsonHttpMessageConverter注册到容器中或者实现WebMvcConfigurer接口重写configureMessageConverters方法，将FastJsonHttpMessageConverter对象加到converters集合中即可。  
3.2 除此之外，我们也可以自定义jackson或者gson的转换器，然后在里面设置一些自己需要的属性，然后注册到容器中即可使用

[properties]: https://so.csdn.net/so/search?q=properties&spm=1001.2101.3001.7020