Using
'@JsonInclude' annotation, you can exclude null and empty values from the
response.
@JsonInclude(JsonInclude.Include.NON_NULL) @JsonIgnoreProperties({"employee_id"}) @JsonPropertyOrder({"last_name", "first_name"}) public class Employee { @JsonProperty("employee_id") private int id; @JsonProperty("first_name") private String firstName; @JsonProperty("last_name") private String lastName; ...... ...... }
Above
snippet exclude null values while serializing.
Find the
below working application.
App.java
package com.sample.app; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class App { public static void main(String[] args) { SpringApplication.run(App.class, args); } }
EmployeeController.java
package com.sample.app.cotroller; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.HttpStatus; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import com.sample.app.model.Employee; import com.sample.app.repository.EmployeeRepository; @RestController @RequestMapping("api/v1/") public class EmployeeController { @Autowired private EmployeeRepository empRepo; @RequestMapping(value = "employees", method = RequestMethod.GET) public ResponseEntity<List<Employee>> all() { return ResponseEntity.ok(empRepo.all()); } @RequestMapping(value = "employees", method = RequestMethod.POST) public ResponseEntity<Employee> create(@RequestBody Employee emp) { Employee persistedEmp = empRepo.add(emp); return ResponseEntity.status(HttpStatus.CREATED).body(persistedEmp); } }
HomeController.java
package com.sample.app.cotroller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class HomeController { @RequestMapping("/") public String home() { return "Hello World"; } }
Employee.java
package com.sample.app.model; import com.fasterxml.jackson.annotation.JsonIgnoreProperties; import com.fasterxml.jackson.annotation.JsonInclude; import com.fasterxml.jackson.annotation.JsonProperty; import com.fasterxml.jackson.annotation.JsonPropertyOrder; @JsonInclude(JsonInclude.Include.NON_NULL) @JsonIgnoreProperties({"employee_id"}) @JsonPropertyOrder({"last_name", "first_name"}) public class Employee { @JsonProperty("employee_id") private int id; @JsonProperty("first_name") private String firstName; @JsonProperty("last_name") private String lastName; public Employee(int id, String firstName, String lastName) { super(); this.id = id; this.firstName = firstName; this.lastName = lastName; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } @Override public String toString() { StringBuilder builder = new StringBuilder(); builder.append("Employee [id=").append(id).append(", firstName=").append(firstName).append(", lastName=") .append(lastName).append("]"); return builder.toString(); } }
EmployeeRepository.java
package com.sample.app.repository; import java.util.ArrayList; import java.util.List; import org.springframework.stereotype.Repository; import com.sample.app.model.Employee; @Repository public class EmployeeRepository { private static final List<Employee> emps = new ArrayList<> (); private static int counter = 4; static { Employee emp1 = new Employee(1, "Sunil", "Dayanand"); Employee emp2 = new Employee(2, null, "Shetty"); Employee emp3 = new Employee(3, "Ram", "Anand"); Employee emp4 = new Employee(4, "Akansha", null); emps.add(emp1); emps.add(emp2); emps.add(emp3); emps.add(emp4); } public List<Employee> all(){ return emps; } public Employee add(Employee emp) { emp.setId(counter); counter++; emps.add(emp); return emp; } }
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>springRest</groupId> <artifactId>springRest</artifactId> <version>1</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.6.RELEASE</version> </parent> <name>springbootApp</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> </project>
Run
App.java.
Open the
url ‘http://localhost:8080/api/v1/employees’ in browser, you can see below json
response.
[ { "last_name": "Dayanand", "first_name": "Sunil" }, { "last_name": "Shetty" }, { "last_name": "Anand", "first_name": "Ram" }, { "first_name": "Akansha" } ]
You can
download complete working application from this link.
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