Java读取配置文件

jdbc.properties配置文件

jdbcUrl     = jdbc:mysql://localhost:3306/tt_test
driverClass = com.mysql.jdbc.Driver
username    = root
password    = root

public class UserDao {

private String jdbcUrl;
private String driverClass;
private String username;
private String password;

/**
* 读取配置文件的信息
* @param resource
* @return
*/
private Properties loadProperties(String resource) {
InputStream inputStream = null;
try {
inputStream = getClass().getResourceAsStream(resource);
Properties props = new Properties();
props.load(inputStream);
jdbcUrl = props.getProperty("jdbcUrl");
driverClass = props.getProperty("driverClass");
username = props.getProperty("username");
password = props.getProperty("password");
return props;
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
try {
inputStream.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}

/**
* 初始化时读取配置文件信息
*/
public UserDao() {
// 读取配置文件
String resource = "jdbc.properties";
Properties props = loadProperties(resource);
// 并初始化信息
jdbcUrl = props.getProperty("jdbcUrl");
driverClass = props.getProperty("driverClass");
username = props.getProperty("username");
password = props.getProperty("password");
}

public String getJdbcUrl() {
return jdbcUrl;
}
public void setJdbcUrl(String jdbcUrl) {
this.jdbcUrl = jdbcUrl;
}
public String getDriverClass() {
return driverClass;
}
public void setDriverClass(String driverClass) {
this.driverClass = driverClass;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

public void print() {
System.out.println("UserDao [jdbcUrl=" + jdbcUrl + ", driverClass=" + driverClass
+ ", username=" + username + ", password=" + password + "]");
}
}

public class test {

@Test
public void test() {
UserDao userDao = new UserDao();
userDao.print();
}
}

测试结果
UserDao [jdbcUrl=jdbc:mysql://localhost:3306/tt_test, driverClass=com.mysql.jdbc.Driver, username=root, password=root ]