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這篇文章主要介紹“怎么將Java對象轉(zhuǎn)換為JSON”,在日常操作中,相信很多人在怎么將Java對象轉(zhuǎn)換為JSON問題上存在疑惑,小編查閱了各式資料,整理出簡單好用的操作方法,希望對大家解答”怎么將Java對象轉(zhuǎn)換為JSON”的疑惑有所幫助!接下來,請跟著小編一起來學(xué)習(xí)吧!
在此代碼段中,我們執(zhí)行以下操作:
使用 setter 方法創(chuàng)建Student
對象并設(shè)置其屬性。
創(chuàng)建JSONObject
調(diào)用object
并將Student
對象用作其構(gòu)造函數(shù)的參數(shù)。
JSONObject
使用 getter 方法生成 JSON 字符串。
調(diào)用object.toString()
方法獲取 JSON 字符串。
import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.google.gson.Gson; import org.json.JSONObject; import java.util.Arrays; public class PojoToJSON { public static void main(String[] args) throws JsonProcessingException { Student student = new Student(); student.setId(1L); student.setName("Alice"); student.setAge(20); student.setCourses(Arrays.asList("Engineering", "Finance", "Chemistry")); JSONObject object = new JSONObject(student); String json = object.toString(); System.out.println(json); System.out.println(new Gson().toJson(student)); // Creating Object of ObjectMapper define in Jackson API ObjectMapper Obj = new ObjectMapper(); // Converting the Java object into a JSON string String jsonStr = Obj.writeValueAsString(student); // Displaying Java object into a JSON string System.out.println(jsonStr); } }
運(yùn)行此代碼會(huì)產(chǎn)生以下結(jié)果:
{"courses":["Engineering","Finance","Chemistry"],"name":"Alice","id":1,"age":20}
{"id":1,"name":"Alice","age":20,"courses":["Engineering","Finance","Chemistry"]}
{"id":1,"name":"Alice","age":20,"courses":["Engineering","Finance","Chemistry"]}
上面代碼中使用的Student類:
import java.util.List; public class Student { private Long id; private String name; private int age; private List<String> courses; public Student(Long id, String name, int age, List<String> courses) { this.id = id; this.name = name; this.age = age; this.courses = courses; } Student() { } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public List<String> getCourses() { return courses; } public void setCourses(List<String> courses) { this.courses = courses; } }
Maven 依賴項(xiàng)
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.example.javaobjectjson</groupId> <artifactId>JavaObjectJSON</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <!-- https://mvnrepository.com/artifact/org.json/json --> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20211205</version> </dependency> <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson --> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.12.1</version> </dependency> </dependencies> </project>
到此,關(guān)于“怎么將Java對象轉(zhuǎn)換為JSON”的學(xué)習(xí)就結(jié)束了,希望能夠解決大家的疑惑。理論與實(shí)踐的搭配能更好的幫助大家學(xué)習(xí),快去試試吧!若想繼續(xù)學(xué)習(xí)更多相關(guān)知識(shí),請繼續(xù)關(guān)注億速云網(wǎng)站,小編會(huì)繼續(xù)努力為大家?guī)砀鄬?shí)用的文章!
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