JsonGenerator接口可用于以流式传输方式将 JSON 数据写入输出源。我们可以使用JsonGenerator的writeStartArray()方法创建或实现一个JSON数组，该方法在当前对象上下文中写入JSON名称/起始数组字符对。 writeStartObject() 方法写入 JSON 起始对象字符，仅在数组上下文中有效，writeEnd() 方法写入当前上下文的结尾。
语法
JsonGenerator writeStartArray(String name)
示例
import java.io.*;
import javax.json.*;
import javax.json.stream.*;
public class JsonGeneratorTest {
public static void main(String[] args) throws Exception {
StringWriter writer = new StringWriter();
JsonGenerator jsonGen = Json.createGenerator(writer);
jsonGen.writeStartObject()
.write("name", "Adithya")
.write("designation", "Python Developer")
.write("company", "TutorialsPoint")
.writeStartArray("personal details")
.writeStartObject()
.write("email", "adithya@gmail.com")
.writeEnd()
.writeStartObject()
.write("contact", "9959927000")
.writeEnd() // end of object
.writeEnd() // end of an array
.writeEnd(); // end of main object
jsonGen.close();
System.out.println(writer.toString());
}
}输出
{"name":"Adithya","designation":"Python Developer","company":"TutorialsPoint","personal details":[{"email":"adithya@gmail.com"},{"contact":"9959927000"}]} 
