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：
<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.qinker</groupId> <artifactId>spring-boot</artifactId> <packaging>war</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.0.RELEASE</version> </parent> <version>0.0.1-SNAPSHOT</version> <name>spring-boot</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>9</java.version> </properties> <dependencies> <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> <build> <finalName>spring-boot</finalName> </build> </project>
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：
<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.47</version> </dependency>
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<HttpMessageConverter<?>> 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<MediaType> 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<MediaType> 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。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
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