log4j example
Description of the code:
Logger.getLogger(): Logger class is used for handling the majority of log operations and getLogger method is used for return a logger according to the value of the parameter. If the logger already exists, then the existing instance will be returned. If the logger is not already exist, then create a new instance.
log.info(): This method is used to check that the specified category is INFO enabled or not, if yes then it converts the massage passed as a string argument to a string by using appropriate object renderer of class ObjectRenderer.
log4jexample.java
import org.apache.log4j.Logger;
class CustomerOrder {
private String productName;
private int productCode;
private int productPrice;
public int getProductCode() {
return productCode;
}
public void setProductCode(int productCode) {
this.productCode = productCode;
}
public String getProductName() {
return productName;
}
public void setProductName(String productName) {
this.productName = productName;
}
public int getProductPrice() {
return productPrice;
}
public void setProductPrice(int productPrice) {
this.productPrice = productPrice;
}
public CustomerOrder(String productName, int productCode,
int productPrice) {
this.productName = productName;
this.productCode = productCode;
this.productPrice = productPrice;
}
}
public class Log4jExample {
private static Logger logger = Logger.getLogger("name");
public void processOrder(CustomerOrder order) {
logger.info(order.getProductName());
}
public static void main(String args[]) {
CustomerOrder order1 = new CustomerOrder("Beer", 101, 20);
CustomerOrder order2 = new CustomerOrder("Lemonade", 95, 10);
CustomerOrder order3 = new CustomerOrder("Chocolate", 223, 5);
Log4jExample demo = new Log4jExample();
demo.processOrder(order1);
demo.processOrder(order2);
demo.processOrder(order3);
}
}
log4j.properties
log4j.rootLogger=debug, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%t %-5p %c{2} - %m%n
Output:
main INFO name - Beer
main INFO name - Lemonade
main INFO name - Chocolate