Spring batch item writer rest API - spring-boot

Question

Is it possible to read data from DB, process it and in ItemWriter send to another system using RestAPI (REST TEMPLATE) in Spring batch project? All I can see is fetch data and write it in a csv file.

Answer 1

It is possible to create your own custom ItemWriter.
In your case, please add the spring-boot-starter-web dependency to either your pom.xml or build.gradle
Example:
package com.example.batch;
import lombok.extern.log4j.Log4j2;
import org.springframework.batch.item.ItemWriter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
import java.util.List;
#Log4j2
public class RestItemWriter implements ItemWriter<String> {
#Autowired
RestTemplate restTemplate;
public RestItemWriter(RestTemplate restTemplate) {
this.restTemplate = restTemplate;
}
#Override
public void write(List<? extends String> items) throws Exception {
ResponseEntity<Users> users = restTemplate.getForEntity("https://jsonplaceholder.typicode.com/users/1", Users.class);
log.info("Status code is: " + users.getStatusCode());
}
}
package com.example.batch;
import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.Getter;
import lombok.Setter;
#Getter
#Setter
#JsonInclude(JsonInclude.Include.NON_NULL)
public class Users {
public String id;
public String name;
public String username;
public String email;
public String phone;
}
More information about custom item writers here