英文:
Read multiple json array with different names dynamically
问题
package com.abc;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
public class JsonRead {
private static final String filePath = "jsonTestFile.json";
public static void main(String[] args) {
try (FileReader reader = new FileReader(ClassLoader.getSystemResource(filePath).getFile())) {
JSONParser jsonParser = new JSONParser();
JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);
Iterator<?> iterator = jsonObject.keySet().iterator(); // Changed variable name
while (iterator.hasNext()) {
String key = (String) iterator.next();
JSONArray jsonArray = (JSONArray) jsonObject.get(key);
Iterator<?> arrayIterator = jsonArray.iterator();
while (arrayIterator.hasNext()) {
JSONObject innerObj = (JSONObject) arrayIterator.next();
System.out.println("high " + innerObj.get("high") + " low " + innerObj.get("low") + " key " + innerObj.get("key"));
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
英文:
I have a JSON which has many arrays with a different name, just like below JSON.
{
"CA": [
{
"high": 5,
"low": 3,
"key": "ABPS"
},
{
"high": 6,
"low": 2,
"key": "ABPO"
}
],
"EE": [
{
"high": 8,
"low": 4,
"key": "ABPS"
},
{
"high": 7,
"low": 2,
"key": "ABPO"
}
]
}
I am trying to iterate JSON array values dynamically without specifying the name of the array.
I am able to read array with specifying the name of the array with below code but how to read array values dynamically without specifying the name of every array because the JSON file I have it has thousands of array.
package com.abc;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
public class JsonRead {
private static final String filePath = "jsonTestFile.json";
public static void main(String[] args) {
try (FileReader reader = new FileReader(ClassLoader.getSystemResource(filePath).getFile())) {
JSONParser jsonParser = new JSONParser();
JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);
// get an array from the JSON object
JSONArray lang = (JSONArray) jsonObject.get("CA");
Iterator i = lang.iterator();
// take each value from the json array separately
while (i.hasNext()) {
JSONObject innerObj = (JSONObject) i.next();
System.out.println("high " + innerObj.get("high") + " low " + innerObj.get("low")+ " key " + innerObj.get("key"));
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
答案1
得分: 0
这可能会有所帮助
for (Iterator iterator = jsonObject.keySet().iterator(); iterator.hasNext();) {
String key = (String) iterator.next();
JSONArray jArray = (JSONArray) jsonObject.get(key);
}
英文:
This might help
for (Iterator iterator = jsonObject.keySet().iterator(); iterator.hasNext();) {
String key = (String) iterator.next();
JSONArray jArray = (JSONArray) jsonObject.get(key);
}
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