常用json框架介紹和Jackson返回結果處理

簡介：介紹常用json框架和注解的使用，自定義返回json結構和格式

1、常用框架 阿里 fastjson,谷歌gson等
JavaBean序列化為Json，性能：Jackson > FastJson > Gson > Json-lib 同個結構
Jackson、FastJson、Gson類庫各有優點，各有自己的專長
空間換時間，時間換空間

2、jackson處理相關自動
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)
指定別名：@JsonProperty

實體類代碼如下：

 

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;
    }
}

 

測試類代碼：

@RestController
public class HttpController {

    @GetMapping("/testjson")
    public Object param6(){
        return new rData("jackson",1,new Date(),"lion");
    }

}

結果：

{"createDate":"2018-09-18 09:36:31","name":"lion","agenum":1}

code被忽略了，所以不顯示；age被別名代替"agenum"