使用Jackson将Java对象转换为JSON

  • Z时代
  • 2024-01-10
  • 分类：问答

我希望我的JSON看起来像这样：

{
    "information": [{
        "timestamp": "xxxx",
        "feature": "xxxx",
        "ean": 1234,
        "data": "xxxx"
    }, {
        "timestamp": "yyy",
        "feature": "yyy",
        "ean": 12345,
        "data": "yyy"
    }]
}

到目前为止的代码：

import java.util.List;
public class ValueData {
    private List<ValueItems> information;
    public ValueData(){
    }
    public List<ValueItems> getInformation() {
        return information;
    }
    public void setInformation(List<ValueItems> information) {
        this.information = information;
    }
    @Override
    public String toString() {
        return String.format("{information:%s}", information);
    }
}

和

public class ValueItems {
    private String timestamp;
    private String feature;
    private int ean;
    private String data;
    public ValueItems(){
    }
    public ValueItems(String timestamp, String feature, int ean, String data){
        this.timestamp = timestamp;
        this.feature = feature;
        this.ean = ean;
        this.data = data;
    }
    public String getTimestamp() {
        return timestamp;
    }
    public void setTimestamp(String timestamp) {
        this.timestamp = timestamp;
    }
    public String getFeature() {
        return feature;
    }
    public void setFeature(String feature) {
        this.feature = feature;
    }
    public int getEan() {
        return ean;
    }
    public void setEan(int ean) {
        this.ean = ean;
    }
    public String getData() {
        return data;
    }
    public void setData(String data) {
        this.data = data;
    }
    @Override
    public String toString() {
        return String.format("{timestamp:%s,feature:%s,ean:%s,data:%s}", timestamp, feature, ean, data);
    }
}

我只是缺少如何使用Jackson将Java对象转换为JSON的部分：

public static void main(String[] args) {
   // CONVERT THE JAVA OBJECT TO JSON HERE
    System.out.println(json);
}

我的问题是：我的课程正确吗？我必须调用哪个实例，以及如何实现此JSON输出？

回答：

要object使用Jackson 转换JSON：

ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter();
String json = ow.writeValueAsString(object);

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