常用框架 阿里fastjson,谷歌gson等
JavaBean序列化为json
- 性能:Jackson>FastJson>Gson>lib 同个结构
- Jackson、Fastjson、Gson等库各有优缺点,各有自己的专长
- 空间换时间,时间换空间
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(JsonInclude.Include.NON_NULL)
- 指定别名:@JsonProperty(“TITLE”)
package net.cyb.demo.domain;
import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import java.io.Serializable;
import java.util.Date;
import java.util.List;
public class Video implements Serializable {
private int id;
//设置别名
@JsonProperty("TITLE")
private String title;
private String summary;
//指定字段不返回
@JsonIgnore
private int pricce;
//空字段不返回
@JsonInclude(JsonInclude.Include.NON_NULL)
private String converImg;
//指定日期格式
@JsonFormat(pattern="yyyy-MM-dd hh:mm:ss",locale="zh",timezone="GMT+8")
private Date createTime;
private List<Chapter> chapterList;
public List<Chapter> getChapterList() {
return chapterList;
}
public void setChapterList(List<Chapter> chapterList) {
this.chapterList = chapterList;
}
public Video() {
}
public Video(int id, String title) {
this.id = id;
this.title = title;
this.createTime = new Date();
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getSummary() {
return summary;
}
public void setSummary(String summary) {
this.summary = summary;
}
public int getPricce() {
return pricce;
}
public void setPricce(int pricce) {
this.pricce = pricce;
}
public String getConverImg() {
return converImg;
}
public void setConverImg(String converImg) {
this.converImg = converImg;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
@Override
public String toString() {
return "Video{" +
"id=" + id +
", title='" + title + '\'' +
", summary='" + summary + '\'' +
", pricce=" + pricce +
", converImg='" + converImg + '\'' +
", createTime=" + createTime +
", chapterList=" + chapterList +
'}';
}
}
序列化操作
public JsonData list() throws JsonProcessingException {
List<Video> list=videoService.listVideo();
ObjectMapper objectMapper=new ObjectMapper();
String jsonStr=objectMapper.writeValueAsString(list);
System.out.println(jsonStr);
return JsonData.buildSuccess(list);
}
反序列化
public JsonData list() throws JsonProcessingException {
List<Video> list=videoService.listVideo();
ObjectMapper objectMapper=new ObjectMapper();
String jsonStr=objectMapper.writeValueAsString(list);
System.out.println(jsonStr);
List<Video> list1 = objectMapper.readValue(jsonStr, List.class);
System.out.println(list1);
return JsonData.buildSuccess(list);
}