我是Spring MVC的初学者，尝试在运行以下应用程序时让SLF4j记录器工作
package com.chris.springdemo;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Component;
import com.chris.springdemo.dao.OrganizationDao;
import com.chris.springdemo.daoimpl.OrganizationDaoImpl;
import com.chris.springdemo.domain.Organization;
@Component
public class LoggingApp {
@Autowired
private OrganizationDao dao;
@Autowired
private DaoUtils daoUtils;
public void actionMethod() {
// Creating seed data
daoUtils.createSeedData(dao);
// List organizations
List<Organization> orgs = dao.getAllOrganizations();
daoUtils.printOrganizations(orgs, daoUtils.readOperation);
// Create a new organization record
Organization org = new Organization("General electric", 1991, "", 28, "Howdy");
boolean isCreated = dao.create(org);
daoUtils.printSuccessFailure(daoUtils.createOperation, isCreated);
daoUtils.printOrganizations(dao.getAllOrganizations(), daoUtils.readOperation);
// Get a single organization
Organization org2 = dao.getOrganization(1);
daoUtils.printOrganization(org2, "getOrganization");
// Updating a slogan for an organization
Organization org3 = dao.getOrganization(2);
org3.setSlogan("We build **awesome** driving machines!");
boolean isUpdated = dao.update(org3);
daoUtils.printSuccessFailure(daoUtils.updateOperation, isUpdated);
daoUtils.printOrganization(dao.getOrganization(2), daoUtils.updateOperation);
// Delete an organization
boolean isDeleted = dao.delete(dao.getOrganization(3));
daoUtils.printSuccessFailure(daoUtils.deleteOperation, isDeleted);
daoUtils.printOrganizations(dao.getAllOrganizations(), daoUtils.deleteOperation);
// Clean up
dao.cleanup();
daoUtils.printOrganizationCount(dao.getAllOrganizations(), daoUtils.cleanupOperation);
}
public static void main(String[] args) {
// creating the application context
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-cp.xml");
LoggingApp mainApp = ctx.getBean(LoggingApp.class);
mainApp.actionMethod();
// close the application context
((ClassPathXmlApplicationContext) ctx).close();
// Create the bean
// OrganizationDao dao = (OrganizationDao) ctx.getBean("orgDao");
}
}
DaoUtils.java包含带Logger的日志语句
package com.chris.springdemo;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import com.chris.springdemo.dao.OrganizationDao;
import com.chris.springdemo.domain.Organization;
@Service
public class DaoUtils {
private static Logger LOGGER = LoggerFactory.getLogger("Logging Tester");
public final String createOperation = "CREATE";
public final String readOperation = "READ";
public final String updateOperation = "UPDATE";
public final String deleteOperation = "DELETE";
public final String cleanupOperation = "TRUNCATE";
public void printOrganizations(List<Organization> orgs, String operation){
LOGGER.info("\n********* printing organizations after " + operation + " operation *********");
for (Organization org : orgs) {
LOGGER.info(org.toString());
}
}
public void printOrganization( Organization org, String operation ) {
LOGGER.info("\n********* printing organization after invoking " + operation + " operation *********\n" + org);
}
public void printSuccessFailure(String operation, boolean param){
if(param)
LOGGER.info("\nOperation " + operation + " successful");
else
LOGGER.info("\nOperation " + operation + " failed");
}
public void createSeedData(OrganizationDao dao){
Organization org1 = new Organization("Amazon", 1994, "65656", 8765, "Work hard, have fun, make history");
Organization org2 = new Organization("BMW", 1929, "45454", 5501, "We build ultimate Driving machines");
Organization org3 = new Organization("Google", 1996, "57575", 4567, "Don't be evil");
List<Organization> orgs = new ArrayList<Organization>();
orgs.add(0, org1); orgs.add(1, org2); orgs.add(2, org3);
//int orgCount = orgs.size();
int createCount = 0;
for(Organization org : orgs){
boolean isCreated = dao.create(org);
if(isCreated)
createCount += 1;
}
LOGGER.info("Created "+ createCount + " organizations");
}
public void printOrganizationCount(List<Organization> orgs, String operation){
LOGGER.info("\n*********Currently we have " + orgs.size()+ " organizations after " + operation + " operation" + " *********");
}
}
我的pom.xml在下面。
<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>com.chris</groupId>
<artifactId>spring-named-jdbc-template-demo-1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.6</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-dao</artifactId>
<version>2.0.8</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
当我运行应用程序时，我收到以下错误
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
当我点击错误中的网址时，它会告诉我
此时会报告此警告消息 无法加载org.slf4j.impl.StaticLoggerBinder类 记忆。当找不到合适的SLF4J绑定时会发生这种情况 在班级路径上。放置一个（也是唯一一个）slf4j-nop.jar slf4j-simple.jar，slf4j-log4j12.jar，slf4j-jdk14.jar或 类路径上的logback-classic.jar应该可以解决问题。以来 1.6.0从SLF4J版本1.6开始，在没有绑定的情况下，SLF4J将默认为无操作（NOP）记录器实现。
但是我的pom.xml上只有一个SLF4J实现
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
<scope>test</scope>
</dependency>
我删除了所有存储库，更新了maven项目，清理了项目等，这似乎都没有解决这个问题。非常感谢任何帮助。
由于 克里斯