SpringBoot注入配置文件的3种方法详解

定义spring的一个实体bean装载配置文件信息，其它要使用配置信息是注入该实体bean/** * 将配置文件中配置的每一个属性的值，映射到这个组件中 * @ConfigurationProperties：告诉SpringBoot将本类中的所有属性和配置文件中相关的配置进行绑定； *   prefix = "person"：配置文件中哪个下面的所有属性进行一一映射 * * 只有这个组件是容器中的组件，才能容器提供的@ConfigurationProperties功能； * */@Component@ConfigurationProperties(prefix = "person")public class Person {​  private String lastName;  private Integer age;  private Boolean boss;  private Date birth;​  private Map<String,Object> maps;  private List<Object> lists;  private Dog dog;

package com.topcheer.oss.base.datasource;​import com.alibaba.druid.pool.DruidDataSource;​import com.xiaoleilu.hutool.crypto.symmetric.SymmetricAlgorithm;import com.xiaoleilu.hutool.crypto.symmetric.SymmetricCrypto;import com.xiaoleilu.hutool.util.CharsetUtil;import com.xiaoleilu.hutool.util.HexUtil;​import lombok.extern.slf4j.Slf4j;​@Slf4jpublic class UmspscDataSource extends DruidDataSource {​  private static final long serialVersionUID = 4766401181052251539L;​  private String passwordDis;    /**   * 密匙   */  private final static String Pkey ="1234565437892132";    @Override  public String getPassword() {    if(passwordDis != null && passwordDis.length() > 0) {      return passwordDis;    }    String encPassword = super.getPassword();    if(null == encPassword) {      return null;    }    log.info("数据库密码加解密，{" + encPassword + "}");    try {      // 密文解密，解密方法可以修改      String key = HexUtil.encodeHexStr(Pkey);      SymmetricCrypto aes = new SymmetricCrypto(SymmetricAlgorithm.AES, key.getBytes());      passwordDis = aes.decryptStr(encPassword, CharsetUtil.CHARSET_UTF_8);      return passwordDis;    } catch (Exception e) {      log.error("数据库密码解密出错，{"+encPassword + "}");      //log.error(LogUtil.e(e));      //throw new Exception("数据库密码解密失败！", e);      return null;    }  }}

@Bean(name = "systemDataSource")  @ConfigurationProperties(ignoreUnknownFields = false, prefix = "spring.datasource.system")  public DataSource systemDataSource() {    return new UmspscDataSource();  }​  @Bean(name = "secondDataSource")  @ConfigurationProperties(ignoreUnknownFields = false, prefix = "spring.datasource.second")  public DataSource secondDataSource() {    return new UmspscDataSource();  }    @Bean(name="systemJdbcTemplate")  public JdbcTemplate systemJdbcTemplate(      @Qualifier("systemDataSource") DataSource dataSource) {    return new JdbcTemplate(dataSource);  }    @Bean(name="secondJdbcTemplate")  public JdbcTemplate secondJdbcTemplate(      @Qualifier("secondDataSource") DataSource dataSource) {    return new JdbcTemplate(dataSource);  }

package com.dxz.property;​import org.springframework.boot.context.properties.ConfigurationProperties;​@ConfigurationProperties(locations = "classpath:mail.properties", ignoreUnknownFields = false, prefix = "mail")public class MailProperties {  private String host;  private int port;  private String from;  private String username;  private String password;  private Smtp smtp;​  // ... getters and setters  public String getHost() {    return host;  }​  public void setHost(String host) {    this.host = host;  }​  public int getPort() {    return port;  }​  public void setPort(int port) {    this.port = port;  }​  public String getFrom() {    return from;  }​  public void setFrom(String from) {    this.from = from;  }​  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 Smtp getSmtp() {    return smtp;  }​  public void setSmtp(Smtp smtp) {    this.smtp = smtp;  }    @Override  public String toString() {    return "MailProperties [host=" + host + ", port=" + port + ", from=" + from + ", username=" + username        + ", password=" + password + ", smtp=" + smtp + "]";  }​  public static class Smtp {    private boolean auth;    private boolean starttlsEnable;​    public boolean isAuth() {      return auth;    }​    public void setAuth(boolean auth) {      this.auth = auth;    }​    public boolean isStarttlsEnable() {      return starttlsEnable;    }​    public void setStarttlsEnable(boolean starttlsEnable) {      this.starttlsEnable = starttlsEnable;    }  }}

package com.dxz.property;​import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.builder.SpringApplicationBuilder;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.bind.annotation.RestController;​@RestController@SpringBootApplication@EnableConfigurationProperties(MailProperties.class)public class TestProperty1 {​  @Autowired  private MailProperties mailProperties;    @RequestMapping(value = "/hello", method = RequestMethod.GET)  @ResponseBody  public String hello() {    System.out.println("mailProperties" + mailProperties);    return "hello world";  }​  public static void main(String[] args) {    //SpringApplication.run(TestProperty1.class, args);    new SpringApplicationBuilder(TestProperty1.class).web(true).run(args);​  }}