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                # Gson – JSON 輸出的精美打印 > 原文: [https://howtodoinjava.com/gson/pretty-print-json-output/](https://howtodoinjava.com/gson/pretty-print-json-output/) 默認情況下,Gson 以緊湊格式打印 JSON,即字段名稱及其值,對象字段以及 JSON 輸出中數組內的對象等之間將沒有空格。 例如: ```java {"id":1,"firstName":"Lokesh","lastName":"Gupta", "emailId":"howtogoinjava@gmail.com"} ``` 要啟用 **Gson 精美打印**功能,我們必須使用[`GsonBuilder`](https://howtodoinjava.com/gson/gson-gsonbuilder-configuration/)配置`Gson`實例。 默認情況下,Gson *格式化輸出 JSON*,其默認行長為 80 個字符,2 個字符的縮進和 4 個字符的右邊距。 ## 1.精美打印 JSON 的語法 ```java Gson gson = new GsonBuilder() .setPrettyPrinting() .create(); String jsonOutput = gson.toJson(someObject); ``` ## 2\. Gson 精美打印示例 序列化`Employee`對象并漂亮地打印 JSON 輸出的 Java 程序。 ```java public class Employee { private Integer id; private String firstName; private String lastName; private String email; //Constructors //Getters and setters } ``` ```java import com.google.gson.Gson; import com.google.gson.GsonBuilder; public class Main { public static void main(String[] args) { Employee employeeObj = new Employee(1, "Lokesh", "Gupta", "howtogoinjava@gmail.com"); Gson gson = new GsonBuilder() .setPrettyPrinting() .create(); System.out.println(gson.toJson(employeeObj)); } } ``` 程序輸出。 ```java { "id": 1, "firstName": "Lokesh", "lastName": "Gupta", "emailId": "howtogoinjava@gmail.com" } ``` 向我提供有關**在 Gson 中實現精美打印**的問題。 學習愉快! 參考: [Gson 用戶指南](https://github.com/google/gson/blob/master/UserGuide.md)
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