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1.排除 spring-boot-starter-json依赖,添加fastjson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>2.1.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.zhong</groupId>
<artifactId>chatper07</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</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-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.46</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2.添加HttpMessageConverters配置
package com.zhong.chatper07.config;
import java.util.ArrayList;
import java.util.List;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
/**
* HttpConverterConfig
*/
@Configuration
public class HttpConverterConfig {
@Bean
public HttpMessageConverters fastJsonHttpMessageConverters() {
// 1.定义一个converters转换消息的对象
FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
// 2.添加fastjson的配置信息,比如: 是否需要格式化返回的json数据
FastJsonConfig fastJsonConfig = new FastJsonConfig();
// 空值特别处理
// WriteNullListAsEmpty 将Collection类型字段的字段空值输出为[]
// WriteNullStringAsEmpty 将字符串类型字段的空值输出为空字符串 ""
// WriteNullNumberAsZero 将数值类型字段的空值输出为0
// WriteNullBooleanAsFalse 将Boolean类型字段的空值输出为false
fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat, SerializerFeature.WriteNullListAsEmpty,
SerializerFeature.WriteNullStringAsEmpty);
// 处理中文乱码问题
List<MediaType> fastMediaTypes = new ArrayList<>();
fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
fastConverter.setSupportedMediaTypes(fastMediaTypes);
// fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
// 3.在converter中添加配置信息
fastConverter.setFastJsonConfig(fastJsonConfig);
// 4.将converter赋值给HttpMessageConverter
HttpMessageConverter<?> converter = fastConverter;
// 5.返回HttpMessageConverters对象
return new HttpMessageConverters(converter);
}
}
3.实体类使用@JSONField注解配置字段的是否需要序列化,格式等。
package com.zhong.chatper07.entity;
import java.util.Date;
import com.alibaba.fastjson.annotation.JSONField;
import com.alibaba.fastjson.support.spring.annotation.FastJsonView;
import org.springframework.format.annotation.DateTimeFormat;
import lombok.Data;
/**
* User
*/
@Data
public class User {
private Integer id;
private String name;
@JSONField(serialize=false)
private String password;
@DateTimeFormat(pattern = "yyyy-MM-dd")
@JSONField(format="yyyy-MM-dd")
private Date createDate;
}
4.编写控制类,返回json数据
package com.zhong.chatper07.controller;
import java.util.Date;
import com.zhong.chatper07.entity.User;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
/**
* UserController
*/
@RestController
public class UserController {
@GetMapping("/user/{id}")
public User findUserById(@PathVariable Integer id){
User user = new User();
user.setId(1);
user.setName("中文");
user.setCreateDate(new Date());
user.setPassword("111");
return user;
}
}