如何在 Java 9 中的 JShell 中导入 gson 库?\
javaobject oriented programmingprogramming更新于 2025/9/26 13:00:17
Java 9 引入了一个名为 JShell 的交互式 REPL 命令行工具。它允许我们执行 Java 代码片段并立即获得结果。我们可以导入可以通过类路径从 JShell 会话访问的外部类。Gson 库 是一个 Java 序列化/反序列化库，用于将 Java 对象转换为 JSON 以及反之亦然。
在下面的代码片段中，我们可以在 JShell 中设置类路径
jshell> /env --class-path C:\Users\User\gson.jar |设置新选项并恢复状态。
一旦我们在 JShell 中导入 gson 库 ，我们就能在列表中看到该库。
jshell> import com.google.gson.*
jshell> /import
| import java.io.*
| import java.math.*
| import java.net.*
| import java.nio.file.*
| import java.util.*
| import java.util.concurrent.*
| import java.util.function.*
| import java.util.prefs.*
| import java.util.regex.*
| import java.util.stream.*
| import com.google.gson.*
jshell> Gson g = new GsonBuilder().setPrettyPrinting().create()
g ==> {serializeNulls:false,factories:[Factory[typeHier ... 78b9],instanceCreators:{}}
在下面的代码片段中，我们创建了一个Employee 类。
jshell> class Employee {
...> private String firstName;
...> private String lastName;
...> private String designation;
...> private String location;
...> public Employee(String firstName, String lastName, String desigation, String location) {
...> this.firstName = firstName;
...> this.lastName = lastName;
...> this.designation = designation;
...> this.location = location;
...> }
...> public String getFirstName() {
...> return firstName;
...> }
...> public String getLastName() {
...> return lastName;
...> }
...> public String getJobDesignation() {
...> return designation;
...> }
...> public String getLocation() {
...> return location;
...> }
...> public String toString() {
...> return "Name = " + firstName + ", " + lastName + " | " +
...> "Job designation = " + designation + " | " +
...> "location = " + location + ".";
...> }
...> }
| created class Employee
jshell> Employee e = new Employee("Jai", "Adithya", "Content Developer", "Hyderabad");
e ==> Name = Jai, Adithya | Job designation = Content D ... er | location = Hyderabad.
jshell> String empSerialized = g.toJson(e)
empSerialized ==> "{\n \"firstName\": \"Jai\",\n \"lastName\": \" ... ation\": \"Hyderabad\"\n}"
在下面的代码片段中，我们可以创建一个 Employee 对象的实例并显示结果。
jshell> System.out.println(empSerialized)
{
"firstName": "Jai",
"lastName": "Adithya",
"designation": "Content Developer",
"location": "Hyderabad"
}
jshell> Employee e1 = g.fromJson(empSerialized, Employee.class)
e1 ==> Name = Jai, Adithya | Job designation = Content D ... er | location = Hyderabad.
相关文章
有用资源
java 参考教程 - 该教程包含有关 java 的更多信息:https://www.cainiaomax.com/java/
