Java googlecode JSON 解析示例

最新推荐文章于 2024-06-13 15:17:31 发布

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最新推荐文章于 2024-06-13 15:17:31 发布

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文章标签： json java

原文链接：https://my.oschina.net/boonya/blog/835073

本文介绍了一个使用Java进行JSON解析的具体实例。通过pom.xml引入json-simple依赖后，演示了如何从JSON文件中读取字符串、数字及数组等数据类型，并展示了如何遍历数组元素和处理复杂的数据结构。

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1.pom.xml配置

<dependency>
	<groupId>com.googlecode.json-simple</groupId>
	<artifactId>json-simple</artifactId>
	<version>1.1</version>
</dependency>

2.准备JSON数据文件jsonTestFile.json

{
  "id": 1,
  "firstname": "Katerina",
  "languages": [
    {
      "lang": "en",
      "knowledge": "proficient"
    },
    {
      "lang": "fr",
      "knowledge": "advanced"
    }
  ],
  "job": {
    "site": "www.javacodegeeks.com",
    "name": "Java Code Geeks"
  }
}

3.Java 解析类

package com.javacodegeeks.javabasics.jsonparsertest;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class JsonParseTest {

	private static final String filePath = "C:\\Users\\katerina\\Desktop\\jsonTestFile.json";
	
	public static void main(String[] args) {

		try {
			// read the json file
			FileReader reader = new FileReader(filePath);

			JSONParser jsonParser = new JSONParser();
			JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);

			// get a String from the JSON object
			String firstName = (String) jsonObject.get("firstname");
			System.out.println("The first name is: " + firstName);

			// get a number from the JSON object
			long id =  (long) jsonObject.get("id");
			System.out.println("The id is: " + id);

			// get an array from the JSON object
			JSONArray lang= (JSONArray) jsonObject.get("languages");
			
			// take the elements of the json array
			for(int i=0; i<lang.size(); i++){
				System.out.println("The " + i + " element of the array: "+lang.get(i));
			}
			Iterator i = lang.iterator();

			// take each value from the json array separately
			while (i.hasNext()) {
				JSONObject innerObj = (JSONObject) i.next();
				System.out.println("language "+ innerObj.get("lang") + 
						" with level " + innerObj.get("knowledge"));
			}
			// handle a structure into the json object
			JSONObject structure = (JSONObject) jsonObject.get("job");
			System.out.println("Into job structure, name: " + structure.get("name"));

		} catch (FileNotFoundException ex) {
			ex.printStackTrace();
		} catch (IOException ex) {
			ex.printStackTrace();
		} catch (ParseException ex) {
			ex.printStackTrace();
		} catch (NullPointerException ex) {
			ex.printStackTrace();
		}

	}

}

转载于:https://my.oschina.net/boonya/blog/835073