Java 中将 JSON 转换为 XML

2025年3月17日 | 阅读 3 分钟

JSON 是一种非常轻量级的数据交换格式，以键值对的形式存储数据。在本节中，我们将了解如何将 JSON 数据转换为 XML 或 XML 数据转换为 JSON。

很多时候，我们会遇到需要将 JSON 转换为 XML 或反之亦来的情况。通过使用 org.json.XML 类，我们可以轻松地将 JSON 对象转换为 XML 数据或 XML 数据转换为 JSON 数据。org.json.XML 类提供了有助于我们进行不同格式转换的方法。

org.json.XML 类的 XML.toString() 方法在将 JSON 对象转换为 XML 字符串方面发挥着重要作用。

org.json.XML 的 toString() 方法的语法如下：

 public static java.lang.String toString(java.lang.Object object) throws JSONException

让我们通过示例了解它们，并理解 toString() 方法在不同数据交换格式的转换中是如何工作的。

ConvertJsonToXml.java

// import required classes and packages
package javaTpoint.JavaExample;

import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.XML;

//create ConvertJsonToXML class to convert JSON data into XML
public class ConvertJsonToXML {
	
	// main() method start
	public static void main(String[] args) throws JSONException {
	   
	   // create variable loc that store location of the Sample.json file 
		String loc = "C:\\Users\\rastogi ji\\OneDrive\\Desktop\\Sample.json";
			
		String result;
		try {
				
			// read byte data from the Sample.json file and convert it into String
			result = new String(Files.readAllBytes(Paths.get(loc)));
			//Convert JSON to XML
			String xml = convertToXML(result, "root"); // This method converts json object to xml string
			
			// use try-catch to store XML data into file.
			FileWriter file = new FileWriter("C:\\Users\\rastogi ji\\OneDrive\\Desktop\\XMLData.txt");
	        	
				// use write() method of File to write XML data into XMLData.txt
	        	file.write(xml); 
	            file.flush();
	            System.out.println("Your XML data is successfully written into XMLData.txt");
	            
	            // close FileWriter
	            file.close();
	            
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}
	
	// create convertToXML() method for converting JSOn data into XML
	public static String convertToXML(String jsonString, String root) throws JSONException {	// handle JSONException
		
		// create instance of JSONObject by passing jsonString to the constructor
		JSONObject jsonObject = new JSONObject(jsonString);
		
		// use XML.toString() method to convert JSON into XML and store the result into a string
		String xml = "<?xml version=\"1.0\" encoding=\"ISO-8859-15\"?>\n<"+root+">" + XML.toString(jsonObject) + "</"+root+">";
		
		// pass the XML data to the main() method
		return xml;
	}
}

输出

ConvertXmlToJson.java

//import required classes and packages
package javaTpoint.JavaExample;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.XML;

//create ConvertJsonToXML class to convert JSON data into XML
public class ConvertXmlToJson {
	// main() method start
	public static void main(String[] args) throws JSONException {
		// use try-catch block for conversion of data-interchange format
		try {
			//Convert XML to JSON by using convertToJSON() method
			String jsonString = convertToJSON("<Designation>Sr. Salesforce Developer</Designation><Address>AMERICA</Address><Mobile>89346724</Mobile><Pet>Dog</Pet><Name>Donal</Name>");
			// use try-catch to store JSON data into file.
			FileWriter file = new FileWriter("C:\\Users\\rastogi ji\\OneDrive\\Desktop\\XMLData.txt");
			// use write() method of File to write JSON data into Sample.json
	        file.write(jsonString); 
	        file.flush();
	        System.out.println("Your JSON data is successfully written into Sample.json"); 
	        // close FileWriter
	        file.close(); 
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}
	// create convertToXML() method for converting JSOn data into XML
	public static String convertToJSON(String xmlString) {	
		JSONObject obj;
		String jsonString = "";
		try {
			// use XML.toJSONObject() method to convert XML data into JSON and store result into a variable of type JSONObject
			obj = XML.toJSONObject(xmlString);
			// get JSON string from JSON object and store it into a variable of type string
			jsonString = obj.toString();
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		// pass the JSON data to the main() method
		return jsonString;
	}
}

输出