【发布时间】：2017-10-16 20:59:07
【问题描述】：
我正在读取一个具有动态结构的 JSON 字符串。 JSON 可能有一个对象和对象数组，或者两者都有，或者只有键值。
我试图遍历所有的可能性，我知道，阅读。
我需要读取整个字符串而不会丢失任何节点/密钥对。
以下是 JSON 的示例：
{
"cityId": {
"city": "Old Delhi",
"cityId": "CTY2",
"stateId": "STE1",
"statusId": "STA1",
"userId": "ONB1"
},
"emailId": "ud.r@gmail.com",
"firstName": "Udit",
"lastName": "R",
"password1": "xxxxxx",
"password2": "xxxxxx",
"statusId": {
"status": "ACTIVE",
"statusId": "STA1"
},
"userId": "ONB2",
"userInfoId": {
"deptId": {
"deptId": "DPT2",
"deptName": "HR",
"statusId": "STA1",
"userId": "ONB1"
},
"roleId": {
"roleId": "RLE2",
"roleName": "Member",
"statusId": "STA1",
"userId": "ONB1"
},
"statusId": {
"status": "ACTIVE",
"statusId": "STA1"
},
"userId": "ONB2",
"userInfoId": "UIN2"
}
}
我当前的 Java 方法：
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import java.io.IOException;
import java.util.Iterator;
import org.json.JSONObject;
// Omittded class definiton, just the method
public void getRSDataFromMethodTwo(String url) throws IOException {
// Initiate client and do JSON request
Client client = Client.create();
WebResource webResource = client.resource(url);
ClientResponse response = webResource.accept("application/json").get(ClientResponse.class);
if (response.getStatus() != 200)
{
throw new RuntimeException("Failed : HTTP error code : " + response.getStatus());
}
String output = response.getEntity(String.class);
System.out.println("Response===get=" + output);
// Parse JSOn
JSONObject json = new JSONObject(output);
Iterator<String> iterator = json.keys();
System.out.println("Fields:");
while (iterator.hasNext())
{
String x = iterator.next().toString();
System.out.println(" Keys " + x);
}
iterator = json.keys();
while (iterator.hasNext())
{
String key = iterator.next();
System.out.println(key + " : " + json.get(key));
if (json.get(key).toString().startsWith("{"))
{
JSONObject childJson = new JSONObject(json.get(key).toString());
Iterator<String> childIterator = childJson.keys();
if (childIterator.hasNext())
{
while (childIterator.hasNext())
{
String chKey = childIterator.next();
System.out.println("Child Key "+chKey+ " : "+childJson.get(chKey));
}
}
}
}
}
还有输出：
Info: firstName : Udit
Info: lastName : Ranjan
Info: statusId : {"statusId":"STA1","status":"ACTIVE"}
Info: Child Key statusId : STA1
Info: Child Key status : ACTIVE
Info: emailId : ud.r@gmail.com
Info: password2 : xxxxxx
Info: cityId : {"statusId":"STA1","city":"Old Delhi","stateId":"STE1","cityId":"CTY2","userId":"ONB1"}
Info: Child Key statusId : STA1
Info: Child Key city : Old Delhi
Info: Child Key stateId : STE1
Info: Child Key cityId : CTY2
Info: Child Key userId : ONB1
Info: password1 : b2b123
Info: userId : ONB2
Info: userInfoId : {"statusId":{"statusId":"STA1","status":"ACTIVE"},"roleId":{"statusId":"STA1","roleId":"RLE2","roleName":"Member","userId":"ONB1"},"deptId":{"deptName":"HR","statusId":"STA1","deptId":"DPT2","userId":"ONB1"},"userId":"ONB2","userInfoId":"UIN2"}
Info: Child Key statusId : {"statusId":"STA1","status":"ACTIVE"}
Info: Child Key roleId : {"statusId":"STA1","roleId":"RLE2","roleName":"Member","userId":"ONB1"}
Info: Child Key deptId : {"deptName":"HR","statusId":"STA1","deptId":"DPT2","userId":"ONB1"}
Info: Child Key userId : ONB2
Info: Child Key userInfoId : UIN2
编辑-因为我无法读取嵌套对象，例如子键 deptId，因为它是动态字符串，我不知道哪个对象具有嵌套对象。
【问题讨论】：
-
该输出实际上缺少什么？它有什么问题？
-
我强烈推荐使用 Jackson。有了这个，你可以设计一个包装 POJO 可以进来的东西，它会自动将整个动态 json 反序列化为你可以交互的 POJO。