java maven项目如何读取配置文件信息

目录

• maven项目读取配置文件信息

• 主类
• 配置文件
• pom文件
• 控制台运行
• jar命令运行

• maven项目结构如下

package com.tomy.hive; 
import java.io.*;
import java.util.Properties;
/**
 * Hello world!
 *
 */
public class App {
    private static String JDBC_URL;
    private static String JDBC_DRIVER;
    /**
     * 读取配置文件
     * @return
     */
    public static void readConfigFile(String cfgFile) {
        try {
            InputStream in = App.class.getClassLoader().getResource(cfgFile).openStream();
            Properties prop = new Properties();
            prop.load(in);
            JDBC_URL = prop.getProperty("jdbc.url");
            JDBC_DRIVER = prop.getProperty("jdbc.driver");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        readConfigFile("resources/jdbc.properties");
        System.out.println(JDBC_URL);
        System.out.println(JDBC_DRIVER);
    }
}

jdbc.url=jdbc:mysql://10.6.52.35:3306/test?characterEncoding=utf-8&serverTimezone=UTC&useSSL=false
jdbc.driver=com.mysql.jdbc.Driver

<?xml version="1.0" encoding="UTF-8"?> 
<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.tomy.hive</groupId>
  <artifactId>hive-demo</artifactId>
  <version>1.0-SNAPSHOT</version>
  <name>hive-demo</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-surefire-plugin</artifactId>
          <configuration>
            <skip>true</skip>
          </configuration>
        </plugin>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-jar-plugin</artifactId>
          <version>3.0.2</version>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <mainClass>com.tomy.hive.App</mainClass>
                    </manifest>
                </archive>
            </configuration>
        </plugin>
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <executions>
            <execution>
              <id>copy-resources</id>
              <phase>validate</phase>
              <goals>
                <goal>copy-resources</goal>
              </goals>
              <configuration>
                <outputDirectory>${project.build.directory}/conf</outputDirectory>
                <resources>
                  <resource>
                    <directory>src/main/resources</directory>
                  </resource>
                </resources>
              </configuration>
            </execution>
          </executions>
        </plugin>
      </plugins>
    </pluginManagement>
    <resources>
      <resource>
        <filtering>true</filtering>
        <directory>src/main/resources</directory>
        <includes>
          <include>**/**.properties</include>
        </includes>
        <targetPath>/resources</targetPath>
      </resource>
    </resources>
  </build>
</project>

InputStream in = new InputStream(new File(“src/main/resources/car.txt”));

InputStream in = this.class.getClassLoader().getResourceAsStream(path);