Java将JSON多维对象元素解析为字符串
我有JSONObject数据，里面有多个对象。 我想做的是，将json转换为简单的层次结构 JSON数据Java将JSON多维对象元素解析为字符串,java,arrays,json,Java,Arrays,Json,我有JSONObject数据，里面有多个对象。 我想做的是，将json转换为简单的层次结构 JSON数据 { "Response": { "type": "string", "content": "0000" }, "Data": { "item": [ { "firstname": { "type": "string",
{
"Response": {
"type": "string",
"content": "0000"
},
"Data": {
"item": [
{
"firstname": {
"type": "string",
"content": "Bryan"
},
"lastname": {
"type": "string",
"content": "Adams"
},
"kids": {
"item": [
{
"name": {
"type": "string",
"content": "Tommy"
},
"age": {
"type": "string",
"content": "9"
}
},
{
"name": {
"type": "string",
"content": "Jane"
},
"age": {
"type": "string",
"content": "4"
}
}
]
}
},
{
"firstname": {
"type": "string",
"content": "Joey"
},
"lastname": {
"type": "string",
"content": "Cena"
},
"kids": {
"item": [
{
"name": {
"type": "string",
"content": "Maria"
},
"age": {
"type": "string",
"content": "7"
}
},
{
"name": {
"type": "string",
"content": "Dany"
},
"age": {
"type": "string",
"content": "3"
}
}
]
}
}
]
}
}
package junk;
import java.util.Iterator;
import org.json.JSONException;
import org.json.JSONObject;
/**
*
* @author Agung
*/
class Foo {
private static JSONObject objResponse = new JSONObject();
public static void main(String args[]) throws JSONException {
JSONObject jsonObj = new JSONObject("{\"Response\":{\"type\":\"string\",\"content\":\"0000\"},\"Data\":{\"item\":[{\"firstname\":{\"type\":\"string\",\"content\":\"Bryan\"},\"lastname\":{\"type\":\"string\",\"content\":\"Adams\"},\"kids\":{\"item\":[{\"name\":{\"type\":\"string\",\"content\":\"Tommy\"},\"age\":{\"type\":\"string\",\"content\":\"9\"}},{\"name\":{\"type\":\"string\",\"content\":\"Jane\"},\"age\":{\"type\":\"string\",\"content\":\"4\"}}]}},{\"firstname\":{\"type\":\"string\",\"content\":\"Joey\"},\"lastname\":{\"type\":\"string\",\"content\":\"Cena\"},\"kids\":{\"item\":[{\"name\":{\"type\":\"string\",\"content\":\"Maria\"},\"age\":{\"type\":\"string\",\"content\":\"7\"}},{\"name\":{\"type\":\"string\",\"content\":\"Dany\"},\"age\":{\"type\":\"string\",\"content\":\"3\"}}]}}]}}");
Foo.getResponseContent(jsonObj);
System.out.println(objResponse);
}
private static void getResponseContent(JSONObject jsonObj) throws JSONException {
Iterator<?> keys = jsonObj.keys();
while (keys.hasNext()) {
String key = (String) keys.next();
if (jsonObj.get(key) instanceof JSONObject) {
JSONObject object = jsonObj.getJSONObject(key);
if (object.has("content")) {
String content = (String) object.get("content");
objResponse.put(key, content);
} else {
// if we get here, so the element have multiple node
objResponse.put(key, object);
getResponseContent(object);
}
}
}
}
}
{
"Response": "0000",
"Data": {
"item": [
{
"firstname": "Bryan",
"lastname": "Adams",
"kids": {
"item": [
{
"name": "Tommy",
"age": 9
},
{
"name": "Jane",
"age": 4
}
]
}
},
{
"firstname": "Joey",
"lastname": "Cena",
"kids": {
"item": [
{
"name": "Maria",
"age": 7
},
{
"name": "Dany",
"age": 3
}
]
}
}
]
}
}
我不知道如何从数据字段中删除对象。这里有一个程序，它以您想要的格式创建输出：像您一样，我使用了递归，我所做的更改是：
- 我处理数组
- 我创建了一个新对象来收集没有“content”键的子对象的数据
package test;
import java.util.Iterator;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class TestMain {
public static void main(String args[]) throws Exception {
JSONObject objResponse = new JSONObject();
JSONObject jsonObj = new JSONObject(
"{\"Response\":{\"type\":\"string\",\"content\":\"0000\"},\"Data\":{\"item\":[{\"firstname\":{\"type\":\"string\",\"content\":\"Bryan\"},\"lastname\":{\"type\":\"string\",\"content\":\"Adams\"},\"kids\":{\"item\":[{\"name\":{\"type\":\"string\",\"content\":\"Tommy\"},\"age\":{\"type\":\"string\",\"content\":\"9\"}},{\"name\":{\"type\":\"string\",\"content\":\"Jane\"},\"age\":{\"type\":\"string\",\"content\":\"4\"}}]}},{\"firstname\":{\"type\":\"string\",\"content\":\"Joey\"},\"lastname\":{\"type\":\"string\",\"content\":\"Cena\"},\"kids\":{\"item\":[{\"name\":{\"type\":\"string\",\"content\":\"Maria\"},\"age\":{\"type\":\"string\",\"content\":\"7\"}},{\"name\":{\"type\":\"string\",\"content\":\"Dany\"},\"age\":{\"type\":\"string\",\"content\":\"3\"}}]}}]}}");
getResponseContent(jsonObj, objResponse);
System.out.println(objResponse.toString(2));
}
private static void getResponseContent(JSONObject jsonObj, JSONObject objResponse) throws JSONException {
Iterator<?> keys = jsonObj.keys();
while (keys.hasNext()) {
String key = (String) keys.next();
JSONObject child = jsonObj.optJSONObject(key);
if (child != null) {
if (child.has("content")) {
objResponse.put(key, child.get("content"));
} else {
JSONObject responseChild = new JSONObject();
objResponse.put(key, responseChild);
getResponseContent(child, responseChild);
}
} else {
JSONArray children = jsonObj.optJSONArray(key);
if (children != null) {
JSONArray responseChildren = new JSONArray();
objResponse.put(key, responseChildren);
for (int i = 0; i < children.length(); i++) {
child = children.getJSONObject(i);
JSONObject responseChild = new JSONObject();
responseChildren.put(responseChild);
getResponseContent(child, responseChild);
}
}
}
}
}
}
如果您可以将json转换为java对象，并在该对象上运行操作，而不是if-else循环，则会更好、更干净。我在java中很少使用json，但在JavaScript中，它们提供了将对象转换为json并返回的字符串化和解析方法。我相信Java也有类似的东西。你能告诉我objResponse是在哪里声明的吗？我有一种感觉，物体可能是罪魁祸首。
package test;
import java.util.Iterator;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class TestMain {
public static void main(String args[]) throws Exception {
JSONObject objResponse = new JSONObject();
JSONObject jsonObj = new JSONObject(
"{\"Response\":{\"type\":\"string\",\"content\":\"0000\"},\"Data\":{\"item\":[{\"firstname\":{\"type\":\"string\",\"content\":\"Bryan\"},\"lastname\":{\"type\":\"string\",\"content\":\"Adams\"},\"kids\":{\"item\":[{\"name\":{\"type\":\"string\",\"content\":\"Tommy\"},\"age\":{\"type\":\"string\",\"content\":\"9\"}},{\"name\":{\"type\":\"string\",\"content\":\"Jane\"},\"age\":{\"type\":\"string\",\"content\":\"4\"}}]}},{\"firstname\":{\"type\":\"string\",\"content\":\"Joey\"},\"lastname\":{\"type\":\"string\",\"content\":\"Cena\"},\"kids\":{\"item\":[{\"name\":{\"type\":\"string\",\"content\":\"Maria\"},\"age\":{\"type\":\"string\",\"content\":\"7\"}},{\"name\":{\"type\":\"string\",\"content\":\"Dany\"},\"age\":{\"type\":\"string\",\"content\":\"3\"}}]}}]}}");
getResponseContent(jsonObj, objResponse);
System.out.println(objResponse.toString(2));
}
private static void getResponseContent(JSONObject jsonObj, JSONObject objResponse) throws JSONException {
Iterator<?> keys = jsonObj.keys();
while (keys.hasNext()) {
String key = (String) keys.next();
JSONObject child = jsonObj.optJSONObject(key);
if (child != null) {
if (child.has("content")) {
objResponse.put(key, child.get("content"));
} else {
JSONObject responseChild = new JSONObject();
objResponse.put(key, responseChild);
getResponseContent(child, responseChild);
}
} else {
JSONArray children = jsonObj.optJSONArray(key);
if (children != null) {
JSONArray responseChildren = new JSONArray();
objResponse.put(key, responseChildren);
for (int i = 0; i < children.length(); i++) {
child = children.getJSONObject(i);
JSONObject responseChild = new JSONObject();
responseChildren.put(responseChild);
getResponseContent(child, responseChild);
}
}
}
}
}
}
{
"Response": "0000",
"Data": {"item": [
{
"firstname": "Bryan",
"lastname": "Adams",
"kids": {"item": [
{
"name": "Tommy",
"age": "9"
},
{
"name": "Jane",
"age": "4"
}
]}
},
{
"firstname": "Joey",
"lastname": "Cena",
"kids": {"item": [
{
"name": "Maria",
"age": "7"
},
{
"name": "Dany",
"age": "3"
}
]}
}
]}
}