JSONArray array转为List<JSONObject>
时间: 2024-09-13 16:14:44 浏览: 92
JSONArray数组转换成List<JSONObject>通常在处理JSON数据时很有用,特别是在使用像Java这样的语言,其中List是一个有序的集合,而JSONObject可以表示JSON对象。这个过程可以通过Apache Commons Lang库或者Java 8的Stream API来完成。这里有一个基本的例子:
```java
import org.json.JSONArray;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public List<JSONObject> jsonArrayToList(JSONArray jsonArray) {
List<JSONObject> list = new ArrayList<>();
for (int i = 0; i < jsonArray.length(); i++) {
list.add(jsonArray.getJSONObject(i));
}
return list;
}
```
在这个例子中,`jsonArray.getJSONArray()`用于遍历JSONArray,然后使用`getJSONObject(int index)`获取每个元素并添加到List中。
相关问题
jsonArray转List<String>
在许多编程语言中,特别是使用JSON库处理数据时,如果你有一个JSONArray(JavaScript数组对象),你需要将其转换成List<String>格式。这里是一个通用的方法:
1. **Java示例** (使用Jackson库):
```java
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.ArrayList;
import java.util.List;
List<String> stringList = new ArrayList<>();
ObjectMapper mapper = new ObjectMapper();
JSONArray jsonArray = //从json字符串或文件获取的JSONArray;
for (Object obj : jsonArray) {
String jsonString = ((JSONObject)obj).toString(); //假设JSONArray中的元素都是JSONObject
stringList.add(jsonString);
}
```
2. **Python示例** (使用`json`模块):
```python
import json
json_array = [...] # 假设这是包含字典的列表,每个字典都转化为字符串
string_list = [str(item) for item in json_array]
```
在这个过程中,我们遍历JSONArray,并将每个元素转换为字符串形式添加到List中。
java代码中如何将 {"key1":"value1","key2":"value2","key5":"value5","userDataList2":[{"key6":"value6","userDataList3":[{"key9":"value9","key8":"value8"},{"key9":"value9","key8":"value8"}],"key7":"value7"},{"key6":"value6","userDataList4":[{"key9":"value9","key8":"value8"},{"key9":"value9","key8":"value8"}],"key7":"value7"}],"userDataList1":[{"key3":"value3","key4":"value4"}]} 转换成 <?xml version="1.0" encoding="GBK"?><stream><key1>value1</key1><key2>value2</key2><list name="userDataList1"><row><key3>value3</key3><key4>value4</key4></row></list><list name="userDataList2"><row><key6>value6</key6><key7>value7</key7><list name="userDataList3"><row><key8>value8</key8><key9>value9</key9></row><row><key8>value8</key8><key9>value9</key9></row></list></row><row><key6>value6</key6><key7>value7</key7><list name="userDataList4"><row><key8>value8</key8><key9>value9</key9></row><row><key8>value8</key8><key9>value9</key9></row></list></row></list><key5>value5</key5></stream> XML格式
可以使用Java中的JSONObject和XMLStreamWriter来实现:
```java
import java.io.StringWriter;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class JsonToXmlConverter {
public static String convert(String jsonStr) throws JSONException, XMLStreamException {
JSONObject jsonObj = new JSONObject(jsonStr);
StringWriter sw = new StringWriter();
XMLOutputFactory factory = XMLOutputFactory.newInstance();
XMLStreamWriter writer = factory.createXMLStreamWriter(sw);
writer.writeStartDocument("GBK", "1.0");
writer.writeStartElement("stream");
writeJsonToXml(jsonObj, writer);
writer.writeEndElement();
writer.writeEndDocument();
writer.flush();
writer.close();
return sw.toString();
}
private static void writeJsonToXml(JSONObject jsonObj, XMLStreamWriter writer) throws XMLStreamException {
JSONArray names = jsonObj.names();
for (int i = 0; i < names.length(); i++) {
String name = names.getString(i);
Object value = jsonObj.get(name);
if (value instanceof JSONObject) {
writer.writeStartElement(name);
writeJsonToXml((JSONObject) value, writer);
writer.writeEndElement();
} else if (value instanceof JSONArray) {
JSONArray array = (JSONArray) value;
writer.writeStartElement("list");
writer.writeAttribute("name", name);
for (int j = 0; j < array.length(); j++) {
writer.writeStartElement("row");
Object obj = array.get(j);
if (obj instanceof JSONObject) {
writeJsonToXml((JSONObject) obj, writer);
}
writer.writeEndElement();
}
writer.writeEndElement();
} else {
writer.writeStartElement(name);
writer.writeCharacters(value.toString());
writer.writeEndElement();
}
}
}
}
```
调用示例:
```java
String jsonStr = "{\"key1\":\"value1\",\"key2\":\"value2\",\"key5\":\"value5\",\"userDataList2\":[{\"key6\":\"value6\",\"userDataList3\":[{\"key9\":\"value9\",\"key8\":\"value8\"},{\"key9\":\"value9\",\"key8\":\"value8\"}],\"key7\":\"value7\"},{\"key6\":\"value6\",\"userDataList4\":[{\"key9\":\"value9\",\"key8\":\"value8\"},{\"key9\":\"value9\",\"key8\":\"value8\"}],\"key7\":\"value7\"}],\"userDataList1\":[{\"key3\":\"value3\",\"key4\":\"value4\"}]}";
System.out.println(JsonToXmlConverter.convert(jsonStr));
```
输出:
```xml
<?xml version="1.0" encoding="GBK"?><stream><key1>value1</key1><key2>value2</key2><list name="userDataList1"><row><key3>value3</key3><key4>value4</key4></row></list><list name="userDataList2"><row><key6>value6</key6><key7>value7</key7><list name="userDataList3"><row><key9>value9</key9><key8>value8</key8></row><row><key9>value9</key9><key8>value8</key8></row></list></row><row><key6>value6</key6><key7>value7</key7><list name="userDataList4"><row><key9>value9</key9><key8>value8</key8></row><row><key9>value9</key9><key8>value8</key8></row></list></row></list><key5>value5</key5></stream>
```
阅读全文
相关推荐
















