Gson是一个由 Google 创建的 Java JSON 库。通过使用 Gson，我们可以生成 JSON并将 JSON 转换为 java 对象。默认情况下，Gson 可以以紧凑格式打印 JSON。要启用Gson漂亮打印，我们必须使用GsonBuilder类的setPrettyPrinting()方法配置Gson实例，该方法将Gson配置为输出JSON适合页面以进行漂亮的打印。
语法
public GsonBuilder setPrettyPrinting()
示例
import java.util.*;
import com.google.gson.*;
public class PrettyJSONTest {
public static void main( String[] args ) {
Employee emp = new Employee("Raja", "115", "Content Engineer", "Java", "Hyderabad");
Gson gson = new GsonBuilder().setPrettyPrinting().create(); // pretty print
String prettyJson = gson.toJson(emp);
System.out.println(prettyJson);
}
}
// Employee class
class Employee {
private String name, id, designation, technology, location;
public Employee(String name, String id, String designation, String technology, String location) {
super();
this.name = name;
this.id = id;
this.designation = designation;
this.technology = technology;
this.location = location;
}
public String getName() {
return name;
}
public String getId() {
return id;
}
public String getDesignation() {
return designation;
}
public String getTechnology() {
return technology;
}
public String getLocation() {
return location;
}
}输出
{
"name": "Raja",
"id": "115",
"designation": "Content Engineer",
"technology": "Java",
"location": "Hyderabad"
} 
