Java 从多层ObjectNode检索行结构
我有一个Java 从多层ObjectNode检索行结构,java,json,parsing,jackson,gson,Java,Json,Parsing,Jackson,Gson,我有一个ObjectNode作为输入参数，我不知道这个节点的确切结构。我的意思是，它可以包含任意数量的层，从非常简单的NameValuePair数组到复杂的结构，如HashMap。如何将其解析为简单的平面结构，如NameValuePair数组？ 我以前用已知的结构为ObjectNodes做过，但现在我不知道 我感谢任何帮助和想法 添加详细信息： 例如，如果我知道，在ObjectNode中，我总是只找到HashMap，仅此而已，我可以执行以下操作： ObjectNode parametersNod
ObjectNodeNameValuePairHashMapNameValuePairObjectNodesHashMapObjectNode parametersNode = (ObjectNode) request.get("parameters");
Iterator fieldNames = parametersNode.getFieldNames();
HashMap<String,String> oldParams = new HashMap<String,String>();
while (fieldNames.hasNext()) {
String name = (String) fieldNames.next();
oldParams.put(name, parametersNode.get(name).asText());
}
{
"name":"value",
"name1":"value1",
"name2":"value2"
}
因为我没有得到答案，所以我自己做了。对于那些将面临同样问题的人，我将其张贴在这里。 它没有任何递归，我在不应该使用HashMap的地方使用了HashMap，但这是一个概念证明，旨在进行重构。 请注意，它是通过邮递员在开关站上作为Web服务进行测试的，所以没有主要方法
public ArrayList<HashMap<String, String>> convertToFlatFormat(
JsonNode request) {
Stack<Pair> stack = new Stack<Pair>();
ArrayList<HashMap<String, String>> parametersList = new ArrayList<HashMap<String, String>>();
stack.push(new Pair("", request));
HashMap<String, Integer> counts = new HashMap<String, Integer>();
while (!stack.isEmpty()) {
Pair higherNodePair = stack.pop();
String nodeName = higherNodePair.name;
JsonNode higherNode = (JsonNode) higherNodePair.object;
String newNamePrefix = "";
if (higherNode.isArray()) {
ArrayNode higherArrayNode = (ArrayNode) higherNode;
for (int i = 0; i < higherNode.size(); i++) {
JsonNode node = higherArrayNode.get(i);
String key = new Integer(i).toString();
if (node.isObject()) {
if (nodeName.equals("")) {
stack.push(new Pair(newNamePrefix, node));
} else {
stack.push(new Pair(nodeName + "_" + newNamePrefix
, node));
}
} else if (node.isArray()) {
if (nodeName.equals("")) {
stack.push(new Pair(newNamePrefix, node));
} else {
stack.push(new Pair(nodeName + "_" + newNamePrefix
, node));
}
} else if (node.isValueNode()) {
ValueNode valueNode = (ValueNode) node;
String value = valueNode.getTextValue();
HashMap<String, String> pair = null;
if (nodeName.equals("")) {
pair = new HashMap<String, String>();
pair.put(newNamePrefix + key, value);
} else {
pair = new HashMap<String, String>();
pair.put(nodeName + "_" + newNamePrefix + key,
value);
}
parametersList.add(pair);
}
}
} else {
Iterator<String> iterate = higherNode.getFieldNames();
while (iterate.hasNext()) {
String key = iterate.next();
JsonNode node = higherNode.get(key);
if (node.isObject()) {
if (nodeName.equals("")) {
stack.push(new Pair(newNamePrefix + key, node));
} else {
stack.push(new Pair(nodeName + "_" + newNamePrefix
+ key, node));
}
} else if (node.isArray()) {
if (nodeName.equals("")) {
stack.push(new Pair(newNamePrefix + key, node));
} else {
stack.push(new Pair(nodeName + "_" + newNamePrefix
+ key, node));
}
} else if (node.isValueNode()) {
ValueNode valueNode = (ValueNode) node;
String value = valueNode.getTextValue();
HashMap<String, String> pair = null;
if (nodeName.equals("")) {
pair = new HashMap<String, String>();
pair.put(newNamePrefix + key, value);
} else {
pair = new HashMap<String, String>();
pair.put(nodeName + "_" + newNamePrefix + key,
value);
}
parametersList.add(pair);
}
}
}
}
return parametersList;
}
private class Pair {
public String name;
public Object object;
public Pair(String name, Object object) {
this.name = name;
this.object = object;
}
}
[
{
"name1": "value1"
},
{
"name2": "value2"
},
{
"name3__dsa_1_ComponentId": "dsa"
},
{
"name3__dsa_1_InstanceId": "sdddd"
},
{
"name3__dsa_2_ComponentId": "dsa"
},
{
"name3__dsa_2_InstanceId": "fdarr"
},
{
"name3__dsa_3_ComponentId": "dsa"
},
{
"name3__dsa_3_InstanceId": "badar"
},
{
"name3__qwer_1_ComponentId": "qwer"
},
{
"name3__qwer_1_InstanceId": "coramba"
},
{
"name3__qwer_2_ComponentId": "qwer"
},
{
"name3__qwer_2_InstanceId": "amba"
}
]
请添加更多细节，一些代码too@Coffee我编辑了我的消息，现在它更有意义了吗？您能为您添加的所有示例显示所需的输出吗？@MichałZiober我编辑了第一条消息，添加了我需要的JSON。这就足够更好地理解了吗？谢谢。是的，现在看起来好多了。谢谢如果两个对象具有相同的属性“name”，该怎么办。我们应该在结果对象中看到什么？
{
"name":"value",
"name1":"value1",
"name2":"value2"
}
public ArrayList<HashMap<String, String>> convertToFlatFormat(
JsonNode request) {
Stack<Pair> stack = new Stack<Pair>();
ArrayList<HashMap<String, String>> parametersList = new ArrayList<HashMap<String, String>>();
stack.push(new Pair("", request));
HashMap<String, Integer> counts = new HashMap<String, Integer>();
while (!stack.isEmpty()) {
Pair higherNodePair = stack.pop();
String nodeName = higherNodePair.name;
JsonNode higherNode = (JsonNode) higherNodePair.object;
String newNamePrefix = "";
if (higherNode.isArray()) {
ArrayNode higherArrayNode = (ArrayNode) higherNode;
for (int i = 0; i < higherNode.size(); i++) {
JsonNode node = higherArrayNode.get(i);
String key = new Integer(i).toString();
if (node.isObject()) {
if (nodeName.equals("")) {
stack.push(new Pair(newNamePrefix, node));
} else {
stack.push(new Pair(nodeName + "_" + newNamePrefix
, node));
}
} else if (node.isArray()) {
if (nodeName.equals("")) {
stack.push(new Pair(newNamePrefix, node));
} else {
stack.push(new Pair(nodeName + "_" + newNamePrefix
, node));
}
} else if (node.isValueNode()) {
ValueNode valueNode = (ValueNode) node;
String value = valueNode.getTextValue();
HashMap<String, String> pair = null;
if (nodeName.equals("")) {
pair = new HashMap<String, String>();
pair.put(newNamePrefix + key, value);
} else {
pair = new HashMap<String, String>();
pair.put(nodeName + "_" + newNamePrefix + key,
value);
}
parametersList.add(pair);
}
}
} else {
Iterator<String> iterate = higherNode.getFieldNames();
while (iterate.hasNext()) {
String key = iterate.next();
JsonNode node = higherNode.get(key);
if (node.isObject()) {
if (nodeName.equals("")) {
stack.push(new Pair(newNamePrefix + key, node));
} else {
stack.push(new Pair(nodeName + "_" + newNamePrefix
+ key, node));
}
} else if (node.isArray()) {
if (nodeName.equals("")) {
stack.push(new Pair(newNamePrefix + key, node));
} else {
stack.push(new Pair(nodeName + "_" + newNamePrefix
+ key, node));
}
} else if (node.isValueNode()) {
ValueNode valueNode = (ValueNode) node;
String value = valueNode.getTextValue();
HashMap<String, String> pair = null;
if (nodeName.equals("")) {
pair = new HashMap<String, String>();
pair.put(newNamePrefix + key, value);
} else {
pair = new HashMap<String, String>();
pair.put(nodeName + "_" + newNamePrefix + key,
value);
}
parametersList.add(pair);
}
}
}
}
return parametersList;
}
private class Pair {
public String name;
public Object object;
public Pair(String name, Object object) {
this.name = name;
this.object = object;
}
}
{
"name1":"value1",
"name2":"value2",
"name3":[
{
"ComponentId":"qwer",
"InstanceId":"amba"
},
{
"ComponentId":"qwer",
"InstanceId":"coramba"
},
{
"ComponentId":"dsa",
"InstanceId":"badar"
},
{
"ComponentId":"dsa",
"InstanceId":"fdarr"
},
{
"ComponentId":"dsa",
"InstanceId":"sdddd"
}
]
}
[
{
"name1": "value1"
},
{
"name2": "value2"
},
{
"name3__dsa_1_ComponentId": "dsa"
},
{
"name3__dsa_1_InstanceId": "sdddd"
},
{
"name3__dsa_2_ComponentId": "dsa"
},
{
"name3__dsa_2_InstanceId": "fdarr"
},
{
"name3__dsa_3_ComponentId": "dsa"
},
{
"name3__dsa_3_InstanceId": "badar"
},
{
"name3__qwer_1_ComponentId": "qwer"
},
{
"name3__qwer_1_InstanceId": "coramba"
},
{
"name3__qwer_2_ComponentId": "qwer"
},
{
"name3__qwer_2_InstanceId": "amba"
}
]