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REST Assured 系列汇总 之 REST Assured 61 - Deserialize Using JsonPath

介绍

早期我们有介绍 De-Serialization – JSON Object To Java Object Using Jackson API，同样我们也可以通过 JsonPath 来反序列化。

前提条件

默认 Rest Assured 是包括 JsonPath 依赖库的。所以只要添加了 Rest Assured 依赖库，就没有必要再添加 JsonPath 依赖库了。

<!-- REST Assured -->
<dependency><groupId>io.rest-assured</groupId><artifactId>rest-assured</artifactId><version>4.4.0</version>
</dependency>

用 JsonPath 反序列化Deserialization

We will take a very simple JSON Object and will create a POJO for it.
将拿一个简单的 JSON Object 为例子，为它创建一个 POJO 类。

JSON Object

{"id": 1,"first_name": "Lothaire","last_name": "Benazet","email": "lbenazet0@tinyurl.com","gender": "Male"
}

Employee POJO

public class Employee {private Integer id;private String first_name;private String last_name;private String email;private String gender;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getFirst_name() {return first_name;}public void setFirst_name(String first_name) {this.first_name = first_name;}public String getLast_name() {return last_name;}public void setLast_name(String last_name) {this.last_name = last_name;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public String getGender() {return gender;}public void setGender(String gender) {this.gender = gender;}
}

将一个 Java object 转换成一个 JSON Object 称为序列化 serialization, 反之是反序列化 Deserialization。JsonPath 类提供一个方法 “T getObject(String path, Class objectType)” 获取一个 Object 的 path 的结果作为一个 Java Object。

反序列化

import io.restassured.path.json.JsonPath;public class DeserializationUsingJsonPath {public static void main(String[] args) {String jsonObject = "{\r\n" + "  \"id\": 1,\r\n" + "  \"first_name\": \"Lothaire\",\r\n" + "  \"last_name\": \"Benazet\",\r\n" + "  \"email\": \"lbenazet0@tinyurl.com\",\r\n" + "  \"gender\": \"Male\"\r\n" + "}";JsonPath jsonPath = JsonPath.from(jsonObject);Employee employee = jsonPath.getObject("", Employee.class);System.out.println("Id is         : "+employee.getId());System.out.println("First name is : "+employee.getFirst_name());System.out.println("Last name is  : "+employee.getLast_name());System.out.println("Email id is   : "+employee.getEmail());System.out.println("Gender is     : "+employee.getGender());// Another wayEmployee employee1 = jsonPath.getObject("$", Employee.class);System.out.println("Id is         : "+employee1.getId());System.out.println("First name is : "+employee1.getFirst_name());System.out.println("Last name is  : "+employee1.getLast_name());System.out.println("Email id is   : "+employee1.getEmail());System.out.println("Gender is     : "+employee1.getGender());}}

输出：

Id is         : 1
First name is : Lothaire
Last name is  : Benazet
Email id is   : lbenazet0@tinyurl.com
Gender is     : Male
Id is         : 1
First name is : Lothaire
Last name is  : Benazet
Email id is   : lbenazet0@tinyurl.com
Gender is     : Male

JSON Array

上面例子用 “” 和 “ $ ” 作为 JSON path，可以得到一个简单的 JSON Object。如果是如下一个嵌套的 JSON Array，我们需要写一个适当的 JSON Path 来反序列化结果。

[{"id": 1,"first_name": "Lothaire","last_name": "Benazet","email": "lbenazet0@tinyurl.com","gender": "Male"
}, {"id": 2,"first_name": "Shellie","last_name": "Cowser","email": "scowser1@163.com","gender": "Female"
}]

如果我们只想反序列化上面 JSON Array 中第二个 JSON Object，实现代码如下：

import io.restassured.path.json.JsonPath;public class DeserializationUsingJsonPath {public static void main(String[] args) {String jsonObject = "[{\r\n" + "  \"id\": 1,\r\n" + "  \"first_name\": \"Lothaire\",\r\n" + "  \"last_name\": \"Benazet\",\r\n" + "  \"email\": \"lbenazet0@tinyurl.com\",\r\n" + "  \"gender\": \"Male\"\r\n" + "}, {\r\n" + "  \"id\": 2,\r\n" + "  \"first_name\": \"Shellie\",\r\n" + "  \"last_name\": \"Cowser\",\r\n" + "  \"email\": \"scowser1@163.com\",\r\n" + "  \"gender\": \"Female\"\r\n" + "}]";JsonPath jsonPath = JsonPath.from(jsonObject);Employee employee = jsonPath.getObject("[1]", Employee.class);System.out.println("Id is         : "+employee.getId());System.out.println("First name is : "+employee.getFirst_name());System.out.println("Last name is  : "+employee.getLast_name());System.out.println("Email id is   : "+employee.getEmail());System.out.println("Gender is     : "+employee.getGender());}}

输出：

Id is         : 2
First name is : Shellie
Last name is  : Cowser
Email id is   : scowser1@163.com
Gender is     : Female