Java 创建POJO以匹配JSON结构
我设计了一个JSON结构来表示一个带有标题列和表行的表,如下所示Java 创建POJO以匹配JSON结构,java,json,gson,pojo,Java,Json,Gson,Pojo,我设计了一个JSON结构来表示一个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" } ],
{
"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"
}
]
]
}
例如,一行就是一个例子
[
{
"fieldValue" : "engine"
},
{
"fieldValue" : "this is an engine"
}
]
行中的条目数与标题列数匹配。因此,“引擎”
是“名称”
列,“这是一个引擎”
是“说明”
列
当我使用GSON将我的POJO转换为JSON字符串时,最接近此结构的是:
{
"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"
]
}
]
}
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));
}
}
enum字段类型{
一串
布尔,
数字,
照片,
照片列表;
}
班级调查场{
私有列表头;
私有列表行;
公共列表getHeader(){
返回头;
}
公共列表getRows(){
返回行;
}
公共无效集合标题(列表标题){
this.header=头;
}
公共无效集合行(列表行){
this.rows=行;
}
}
类调查列{
专用字段类型字段类型;
私有布尔只读;
私有字符串头值;
公共静态类生成器{
专用字段类型字段类型;
私有布尔只读;
私有字符串头值;
具有字段类型的公共生成器(字段类型字段类型){
this.fieldType=fieldType;
归还这个;
}
带只读的公共生成器(布尔只读){
this.readOnly=readOnly;
归还这个;
}
具有headerValue的公共生成器(字符串headerValue){
this.headerValue=headerValue;
归还这个;
}
公共调查栏目建设(){
返回新的SurveyColumn(fieldType、readOnly、headerValue);
}
}
public SurveyColumn(FieldType FieldType、boolean readOnly、String headerValue){
this.fieldType=fieldType;
this.readOnly=readOnly;
this.headerValue=headerValue;
}
}
阶级调查{
公共静态类生成器{
私有字符串[]字段值;
带字段值的公共生成器(字符串[]字段值){
this.fieldValues=字段值;
归还这个;
}
公共勘测建筑(){
返回新的SurveyRow(字段值);
}
}
私有字符串[]字段值;
公共调查(字符串[]字段值){
this.fieldValues=字段值;
}
}
公共类TestGson{
公共静态void main(字符串[]args){
SurveyFields=新的SurveyFields();
fields.setHeader(Arrays.asList)(新的SurveyColumn[]{
新建SurveyColumn.Builder().withHeaderValue(“名称”)。withFieldType(FieldType.STRING)。withReadOnly(true)
.build(),
新建SurveyColumn.Builder().withHeaderValue(“description”).withFieldType(FieldType.STRING)
.withReadOnly(true).build()});
fields.setRows(Arrays.asList)(新SurveyRow[]{
新建SurveyRow.Builder().WithFieldValue(新字符串[]{“引擎”,“这是一个引擎”})。build(),
新建SurveyRow.Builder().WithFieldValue(新字符串[]{“引擎”,“这是一个引擎”})。build(),
新建SurveyRow.Builder().WithFieldValue(新字符串[]{“引擎”,“这是一个引擎”})。build(),
新建SurveyRow.Builder().WithFieldValue(新字符串[]{“引擎”,“这是一个引擎”}).build()
}));
Gson Gson=新的Gson();
System.out.println(gson.toJson(字段));
}
}
如何构造POJO以匹配预期的JSON输出?如果您从第三方获得JSON,可能会帮助您从JSON生成POJO。到目前为止做得很好。。但是确切的问题是什么?我已经澄清了这一点,现在有了一些新的补充,这是一个有用的网站!单击“预览我的JSON示例”只会显示一个空白页面?@user2987444您是否选择源类型为“JSON”而不是“JSON模式”?它的结构很好,但不准确。