SpringBoot使用自定义json解析器的使用方法

本篇文章主要介绍了SpringBoot使用自定义json解析器的使用方法，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧

Spring-Boot是基于Spring框架的，它并不是对Spring框架的功能增强，而是对Spring的一种快速构建的方式。

Spring-boot应用程序提供了默认的json转换器，为Jackson。示例：

pom.xml中dependency配置：

4.0.0com.qinkerspring-bootwarorg.springframework.bootspring-boot-starter-parent2.0.0.RELEASE0.0.1-SNAPSHOTspring-boothttp://maven.apache.orgUTF-89org.springframework.bootspring-boot-starter-webspring-boot

创建三个类：MainApp.java和User.java以及HelloController.java：

package com.springboot; import java.util.Date; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class HelloController { @RequestMapping("/hello") public String hello() { return "hello,SpringBoot"; } /** * Spring boot 默认json解析框架是Jackson * @return */ @RequestMapping("/getUser") public User getUser() { User u = new User(); u.setName("张三"); u.setAge(33); u.setCreateTime(new Date()); return u; } }

package com.springboot; import java.io.Serializable; import java.util.Date; public class User implements Serializable{ private String name; private int age; private Date createTime; 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 getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } }

package com.springboot; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class MainApp{ public static void main(String[] args) { SpringApplication.run(MainApp.class, args); } }

启动MainApp：访问http://localhost:8080/getUser,结果如下：

{"name":"张三","age":33,"createTime":"2018-04-04T03:03:08.534+0000"}

可见：我们并未做任何配置，返回的却是json数据，可见Spring-Boot对json做了默认实现，使用的是内置Jackson转换器。

那么，下面看看如何使用自定义的json转换器，这里以fastjson为例：

首先，引入fastjson包，在pom中添加如下依赖：

com.alibabafastjson1.2.47

为了方便看出效果：修改User类：

package com.springboot; import java.io.Serializable; import java.util.Date; import com.alibaba.fastjson.annotation.JSONField; @SuppressWarnings("serial") public class User implements Serializable{ private String name; private int age; @JSONField(format="yyyy-MM-dd HH:mm") private Date createTime; 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 getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } }

1.实现fastjson自定义json转换的第一种方式，Spring-Boot实现WebMvcConventer接口：

修改MainApp如下： 

package com.springboot; import java.util.ArrayList; import java.util.List; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.http.MediaType; import org.springframework.http.converter.HttpMessageConverter; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; import com.alibaba.fastjson.serializer.SerializerFeature; import com.alibaba.fastjson.support.config.FastJsonConfig; import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter; @SpringBootApplication public class MainApp implements WebMvcConfigurer{ @Override public void configureMessageConverters(List> converters) { WebMvcConfigurer.super.configureMessageConverters(converters); //创建fastjson转换器实例 FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter(); //配置对象 FastJsonConfig config = new FastJsonConfig(); List mediaTypes = new ArrayList(); //中文编码 MediaType mediaType = MediaType.APPLICATION_JSON_UTF8; mediaTypes.add(mediaType); config.setSerializerFeatures(SerializerFeature.PrettyFormat); converter.setSupportedMediaTypes(mediaTypes); converter.setFastJsonConfig(config); converters.add(converter); } public static void main(String[] args) { SpringApplication.run(MainApp.class, args); } }

启动程序：访问上面的路径：浏览器会看到如下结果：

{ "age":33, "createTime":"2018-04-04 11:14", "name":"张三" }

2.使用@Bean注解注入fastjson转换器：修改MainApp如下：

package com.springboot; import java.util.ArrayList; import java.util.List; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.autoconfigure.http.HttpMessageConverters; import org.springframework.context.annotation.Bean; import org.springframework.http.MediaType; import com.alibaba.fastjson.serializer.SerializerFeature; import com.alibaba.fastjson.support.config.FastJsonConfig; import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter; @SpringBootApplication public class MainApp{ @Bean public HttpMessageConverters fastJsonHttpMessageConventers() { FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter(); FastJsonConfig config = new FastJsonConfig(); config.setSerializerFeatures(SerializerFeature.PrettyFormat); List mediaTypes = new ArrayList(); mediaTypes.add(MediaType.APPLICATION_JSON_UTF8); converter.setSupportedMediaTypes(mediaTypes); return new HttpMessageConverters(converter); } public static void main(String[] args) { SpringApplication.run(MainApp.class, args); } }

访问结果是一样的。