[英]Creating POJOs to match a JSON structure
I have devised a JSON structure to represent a table with header columns plus table rows that looks like the following. 我设计了一个JSON结构来表示带有标题列和表行的表,如下所示。
{
"header": [
{
"fieldType": "STRING",
"readOnly": true,
"headerValue": "name"
},
{
"fieldType": "STRING",
"readOnly": true,
"headerValue": "description"
}
],
"rows": [
[
{
"fieldValue" : "engine"
},
{
"fieldValue" : "this is an engine"
}
],
[
{
"fieldValue" : "engine"
},
{
"fieldValue" : "this is an engine"
}
],
[
{
"fieldValue" : "engine"
},
{
"fieldValue" : "this is an engine"
}
],
[
{
"fieldValue" : "engine"
},
{
"fieldValue" : "this is an engine"
}
]
]
}
A row is for example 以某行为例
[
{
"fieldValue" : "engine"
},
{
"fieldValue" : "this is an engine"
}
]
The number of entries in a row matches the number of header columns. 行中条目的数量与标题列的数量匹配。 So "engine"
is the "name"
column and "this is an engine"
is the "description"
column 因此, "engine"
是"name"
列,而"this is an engine"
是"description"
列
When I use GSON to turn my POJO's into a JSON String the closest I have got to match this structure is: 当我使用GSON将POJO转换为JSON字符串时,与该结构最匹配的是:
{
"header": [
{
"fieldType": "STRING",
"readOnly": true,
"headerValue": "name"
},
{
"fieldType": "STRING",
"readOnly": true,
"headerValue": "description"
}
],
"rows": [
{
"fieldValues": [
"engine",
"this is an engine"
]
},
{
"fieldValues": [
"engine",
"this is an engine"
]
},
{
"fieldValues": [
"engine",
"this is an engine"
]
},
{
"fieldValues": [
"engine",
"this is an engine"
]
}
]
}
Here's the code I'm using to test 这是我用来测试的代码
enum FieldType {
STRING,
BOOLEAN,
NUMBER,
PHOTO,
PHOTOLIST;
}
class SurveyFields {
private List<SurveyColumn> header;
private List<SurveyRow> rows;
public List<SurveyColumn> getHeader() {
return header;
}
public List<SurveyRow> getRows() {
return rows;
}
public void setHeader(List<SurveyColumn> header) {
this.header = header;
}
public void setRows(List<SurveyRow> rows) {
this.rows = rows;
}
}
class SurveyColumn {
private FieldType fieldType;
private boolean readOnly;
private String headerValue;
public static class Builder {
private FieldType fieldType;
private boolean readOnly;
private String headerValue;
public Builder withFieldType(FieldType fieldType) {
this.fieldType = fieldType;
return this;
}
public Builder withReadOnly(boolean readOnly) {
this.readOnly = readOnly;
return this;
}
public Builder withHeaderValue(String headerValue) {
this.headerValue = headerValue;
return this;
}
public SurveyColumn build() {
return new SurveyColumn(fieldType, readOnly, headerValue);
}
}
public SurveyColumn(FieldType fieldType, boolean readOnly, String headerValue) {
this.fieldType = fieldType;
this.readOnly = readOnly;
this.headerValue = headerValue;
}
}
class SurveyRow {
public static class Builder {
private String[] fieldValues;
public Builder withFieldValues(String[] fieldValues) {
this.fieldValues = fieldValues;
return this;
}
public SurveyRow build() {
return new SurveyRow(fieldValues);
}
}
private String[] fieldValues;
public SurveyRow(String[] fieldValues) {
this.fieldValues = fieldValues;
}
}
public class TestGson {
public static void main(String[] args) {
SurveyFields fields = new SurveyFields();
fields.setHeader(Arrays.asList(new SurveyColumn[] {
new SurveyColumn.Builder().withHeaderValue("name").withFieldType(FieldType.STRING).withReadOnly(true)
.build(),
new SurveyColumn.Builder().withHeaderValue("description").withFieldType(FieldType.STRING)
.withReadOnly(true).build() }));
fields.setRows(Arrays.asList(new SurveyRow[] {
new SurveyRow.Builder().withFieldValues(new String[] { "engine", "this is an engine" }).build(),
new SurveyRow.Builder().withFieldValues(new String[] { "engine", "this is an engine" }).build(),
new SurveyRow.Builder().withFieldValues(new String[] { "engine", "this is an engine" }).build(),
new SurveyRow.Builder().withFieldValues(new String[] { "engine", "this is an engine" }).build()
}));
Gson gson = new Gson();
System.out.println(gson.toJson(fields));
}
}
How can I structure my POJO's to match the expected JSON output? 如何构造POJO以匹配预期的JSON输出?
如果您从第三方获得JSON,则此站点可能会帮助您从JSON生成POJO。
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