如何使用Java中的JSONlib API将Map转换为JSON对象？

语法

public void accumulateAll(Map map)

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在下面的示例中，我们可以将 Map 转换为 JSON 对象。

示例

import java.util.*;
import net.sf.json.JSONObject;

public class ConvertMapToJSONObjectTest {
public static void main(String[] args)throws Exception {
JSONObject jsonObject = new JSONObject();
Map employees = new HashMap();

employees.put(1, new Employee("Adithya", "Jai", 30));
employees.put(2, new Employee("Vamsi", "Krishna", 28));
employees.put(3, new Employee("Chaitanya", "Sai", 30));

jsonObject.accumulateAll(employees);
System.out.println(jsonObject.toString(3)); // pretty print JSON
}
public static class Employee {
private String firstName, lastName;
private int age;
public Employee(String firstName, String lastName, int age) {
super();
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public int getAge() {
return age;
}
}
}

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输出

{
"1": {
"firstName": "Adithya",
"lastName": "Jai",
"age": 30
},
"2": {
"firstName": "Vamsi",
"lastName": "Krishna",
"age": 28
},
"3": {
"firstName": "Chaitanya",
"lastName": "Sai",
"age": 30
}
}

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