简介：介绍常用json框架和注解的使用，自定义返回json结构和格式
1、常用框架 阿里 fastjson,谷歌gson等
JavaBean序列化为Json，性能：Jackson > FastJson > Gson > Json-lib 同个结构
Jackson、FastJson、Gson类库各有优点，各有自己的专长
空间换时间，时间换空间
2、jackson处理相关自动
指定字段不返回：@JsonIgnore
指定日期格式：@JsonFormat(pattern="yyyy-MM-dd hh:mm:ss",locale="zh",timezone="GMT+8")
空字段不返回：@JsonInclude(Include.NON_NUll)
指定别名：@JsonProperty
实体类代码如下：
public class rData { ???????@JsonIgnore ???private String code; ???@JsonProperty(value = "agenum") ???private int age; ???@JsonFormat(pattern="yyyy-MM-dd hh:mm:ss",locale="zh",timezone="GMT+8") ???private Date createDate; ???@JsonInclude(JsonInclude.Include.NON_NULL) ???private String name; ???public String getName() { ???????return name; ???} ???public void setName(String name) { ???????this.name = name; ???} ???public Date getCreateDate() { ???????return createDate; ???} ???public void setCreateDate(Date createDate) { ???????this.createDate = createDate; ???} ???public int getAge() { ???????return age; ???} ???public void setAge(int age) { ???????this.age = age; ???} ???public String getCode() { ???????return code; ???} ???public void setCode(String code) { ???????this.code = code; ???} ???????public rData(String code, int age) { ???????this.code = code; ???????this.age = age; ???} ???public rData(String code, int age, Date createDate, String name) { ???????this.code = code; ???????this.age = age; ???????this.createDate = createDate; ???????this.name = name; ???}}测试类代码：
@RestControllerpublic class HttpController { ???@GetMapping("/testjson") ???public Object param6(){ ???????return new rData("jackson",1,new Date(),"lion"); ???}}结果：
{"createDate":"2018-09-18 09:36:31","name":"lion","agenum":1}code被忽略了，所以不显示；age被别名代替"agenum"常用json框架介绍和Jackson返回结果处理
原文地址：https://www.cnblogs.com/Mblood/p/9667191.html