Java系列之:ObjectMapper实现对象转化为Json、集合转化为Json、Json转化为对象、Json转化为JsonNode、JsonNode转化为Json字符串 |
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Java系列之:ObjectMapper实现对象转化为Json、集合转化为Json、Json转化为对象、Json转化为JsonNode、JsonNode转化为Json字符串
一、创建类Dataset二、生成对象插入数据三、对象转化为Json四、集合转化为Json五、Json转化为对象六、Json转JsonNode七、获取JsonNode中数据八、JsonNode转化为json字符串
一、创建类Dataset
import lombok.Data;
@Data
public class Dataset {
/**
* 数据表全称
*/
private String tableName;
/**
* 数据库名称
*/
private String databaseName;
/**
* 表的描述
*/
private String tableComment;
/**
* 表的行数
*/
private Long tableRows;
}
二、生成对象插入数据
Dataset dataset = new Dataset();
dataset.setDatabaseName("dw数据库");
dataset.setTableName("order订单表");
dataset.setTableComment("订单表存放用户订单信息");
dataset.setTableRows(1000L);
Dataset dataset1 = new Dataset();
dataset1.setDatabaseName("optics数据库");
dataset1.setTableName("optics订单表");
dataset1.setTableComment("订单表存放光学订单信息");
dataset1.setTableRows(8000L);
三、对象转化为Json
//对象转化为JSON
ObjectMapper objectMapper = new ObjectMapper();
String datasetToJson = objectMapper.writeValueAsString(dataset);
System.out.println(datasetToJson);
输出如下所示: {"tableName":"order订单表","databaseName":"dw数据库","tableComment":"订单表存放用户订单信息","tableRows":1000} 四、集合转化为Json生成集合 ArrayList datasetList = new ArrayList(); datasetList.add(dataset); datasetList.add(dataset1); System.out.println(datasetList);输出如下所示: [Dataset(tableName=order订单表, databaseName=dw数据库, tableComment=订单表存放用户订单信息, tableRows=1000), Dataset(tableName=optics订单表, databaseName=optics数据库, tableComment=订单表存放光学订单信息, tableRows=8000)]集合转化为JSON //集合转化为JSON String dataSetListJson = objectMapper.writeValueAsString(datasetList); System.out.println(dataSetListJson);输出如下所示: [{"tableName":"order订单表","databaseName":"dw数据库","tableComment":"订单表存放用户订单信息","tableRows":1000},{"tableName":"optics订单表","databaseName":"optics数据库","tableComment":"订单表存放光学订单信息","tableRows":8000}] 五、Json转化为对象 Dataset dataset3 = objectMapper.readValue(datasetToJson,Dataset.class); System.out.println(dataset3);输出如下所示: Dataset(tableName=order订单表, databaseName=dw数据库, tableComment=订单表存放用户订单信息, tableRows=1000) 六、Json转JsonNodedatasetToJson为: {“tableName”:“order订单表”,“databaseName”:“dw数据库”,“tableComment”:“订单表存放用户订单信息”,“tableRows”:1000} //JSON转JsonNode JsonNode jsonNode = objectMapper.readTree(datasetToJson); System.out.println("输出jsonNode:"+jsonNode);输出如下所示: 输出jsonNode:{"tableName":"order订单表","databaseName":"dw数据库","tableComment":"订单表存放用户订单信息","tableRows":1000}dataSetListJson为: [{“tableName”:“order订单表”,“databaseName”:“dw数据库”,“tableComment”:“订单表存放用户订单信息”,“tableRows”:1000},{“tableName”:“optics订单表”,“databaseName”:“optics数据库”,“tableComment”:“订单表存放光学订单信息”,“tableRows”:8000}] JsonNode jsonNode1 = objectMapper.readTree(dataSetListJson); System.out.println("输出jsonNode:"+jsonNode1);输出如下所示: 输出jsonNode: [{"tableName":"order订单表","databaseName":"dw数据库","tableComment":"订单表存放用户订单信息","tableRows":1000}, {"tableName":"optics订单表","databaseName":"optics数据库","tableComment":"订单表存放光学订单信息","tableRows":8000}] 七、获取JsonNode中数据查JsonNode数据: String databaseName = jsonNode.path("databaseName").asText(); System.out.println(databaseName); String databaseName1 = jsonNode.get("databaseName").asText(); System.out.println(databaseName1);输出如下所示: dw数据库 dw数据库 八、JsonNode转化为json字符串 //JsonNode转为json字符串 String jsonNodeString = objectMapper.writeValueAsString(jsonNode); System.out.println(jsonNodeString);输出如下所示: {"tableName":"order订单表","databaseName":"dw数据库","tableComment":"订单表存放用户订单信息","tableRows":1000} |
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