SpringBoot使用自定義json解析器的使用方法

Spring-Boot是基於Spring框架的，它並不是對Spring框架的功能增強，而是對Spring的一種快速構建的方式。

Spring-boot應用程序提供了默認的json轉換器，為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>

創建三個類：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 默認json解析框架是Jackson * @return */ @RequestMapping("/getUser") public User getUser() { User u = new User(); u.setName("張三"); 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); } }

啟動MainApp：訪問http://localhost:8080/getUser,結果如下：

 {"name":"張三","age":33,"createTime":"2018-04-04T03:03:08.534+0000"}

可見：我們並未做任何配置，返回的卻是json數據，可見Spring-Boot對json做了默認實現，使用的是內置Jackson轉換器。

那麼，下面看看如何使用自定義的json轉換器，這里以fastjson為例：

首先，引入fastjson包，在pom中添加如下依賴：

 <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.47</version> </dependency>

為了方便看出效果：修改User類：

 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.實現fastjson自定義json轉換的第一種方式，Spring-Boot實現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); //創建fastjson轉換器實例FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter(); //配置對象FastJsonConfig config = new FastJsonConfig(); List<MediaType> mediaTypes = new ArrayList<>(); //中文編碼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); } }

啟動程序：訪問上面的路徑：瀏覽器會看到如下結果：

 { "age":33, "createTime":"2018-04-04 11:14", "name":"張三" }

2.使用@Bean註解注入fastjson轉換器：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); } }

訪問結果是一樣的。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。