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在Java中,可以使用各種庫(kù)來(lái)實(shí)現(xiàn)集合與JSON、XML等數(shù)據(jù)格式之間的轉(zhuǎn)換。以下是一些常用的庫(kù)及其使用方法:
對(duì)于JSON轉(zhuǎn)換,可以使用Jackson或Gson庫(kù)。這里以Jackson為例:
首先,添加Jackson依賴(lài)到項(xiàng)目中(以Maven為例):
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.12.5</version>
</dependency>
然后,使用ObjectMapper類(lèi)進(jìn)行JSON與Java對(duì)象之間的轉(zhuǎn)換:
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.HashMap;
import java.util.Map;
public class JsonConversion {
public static void main(String[] args) throws Exception {
// 創(chuàng)建一個(gè)Java對(duì)象
Map<String, Object> person = new HashMap<>();
person.put("name", "John");
person.put("age", 30);
// 將Java對(duì)象轉(zhuǎn)換為JSON字符串
ObjectMapper objectMapper = new ObjectMapper();
String jsonString = objectMapper.writeValueAsString(person);
System.out.println("JSON字符串: " + jsonString);
// 將JSON字符串轉(zhuǎn)換為Java對(duì)象
Map<String, Object> personFromJson = objectMapper.readValue(jsonString, HashMap.class);
System.out.println("從JSON字符串轉(zhuǎn)換回的Java對(duì)象: " + personFromJson);
}
}
對(duì)于XML轉(zhuǎn)換,可以使用JAXB(Java Architecture for XML Binding)庫(kù)。首先,需要安裝JAXB庫(kù)并提供相應(yīng)的注解。以下是一個(gè)簡(jiǎn)單的示例:
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Person {
private String name;
private int age;
// 構(gòu)造函數(shù)、getter和setter方法省略
}
接下來(lái),使用JAXB將Java對(duì)象轉(zhuǎn)換為XML字符串,以及將XML字符串轉(zhuǎn)換為Java對(duì)象:
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import java.io.StringReader;
import java.io.StringWriter;
public class XmlConversion {
public static void main(String[] args) throws JAXBException {
// 創(chuàng)建一個(gè)Java對(duì)象
Person person = new Person();
person.setName("John");
person.setAge(30);
// 將Java對(duì)象轉(zhuǎn)換為XML字符串
JAXBContext jaxbContext = JAXBContext.newInstance(Person.class);
Marshaller marshaller = jaxbContext.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
StringWriter stringWriter = new StringWriter();
marshaller.marshal(person, stringWriter);
String xmlString = stringWriter.toString();
System.out.println("XML字符串: " + xmlString);
// 將XML字符串轉(zhuǎn)換為Java對(duì)象
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
Person personFromXml = (Person) unmarshaller.unmarshal(new StringReader(xmlString));
System.out.println("從XML字符串轉(zhuǎn)換回的Java對(duì)象: " + personFromXml);
}
}
這些示例展示了如何使用Java庫(kù)將集合與JSON、XML等數(shù)據(jù)格式之間進(jìn)行轉(zhuǎn)換。實(shí)際應(yīng)用中,可以根據(jù)需要選擇合適的庫(kù)并進(jìn)行相應(yīng)的配置。
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