How Springboot reads custom pro files and injects static variables

Springboot reads the pro file and injects static variables

mailConfig.properties

#服务器
mail.host=smtp.qq.com
#端口号
mail.port=587
#邮箱账号
mail.userName=hzy_daybreak_lc@foxmail.com
#邮箱授权码
mail.passWord=vxbkycyjkceocbdc
#时间延迟
mail.timeout=25000
#发送人
mail.emailForm=hzy_daybreak_lc@foxmail.com
#发件人
mail.personal=华夏衣裳
#主题
mail.subject=同袍用户激活
#内容模板
mail.html=您的邮箱验证码为：

MailConfig.java

/*
 * @(#)MailConfig.java    Created on 2019年9月11日
 * Copyright (c) 2019 ZDSoft Networks, Inc. All rights reserved.
 * $Id$
 */
package com.hxyc.config.properties;
 
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
 
/**
 * @author huangzy
 * @version $Revision: 1.0 $, $Date: 2019年9月11日 上午10:29:35 $
 */
@Configuration
@PropertySource(value = "classpath:config/mailConfig.properties", encoding = "UTF-8")
@Component
public class MailConfig {
    public static String host;
    public static Integer port;
    public static String userName;
    public static String passWord;
    public static String emailForm;
    public static String timeout;
    public static String personal;
    public static String html;
    public static String subject;
 
    /**
     * @return Returns the host.
     */
    public static String getHost() {
        return host;
    }
 
    /**
     * @param host
     *            The host to set.
     */
    @Value("${mail.host}")
    public void setHost(String host) {
        MailConfig.host = host;
    }
 
    /**
     * @return Returns the port.
     */
    public static Integer getPort() {
        return port;
    }
 
    /**
     * @param port
     *            The port to set.
     */
    @Value("${mail.port}")
    public void setPort(Integer port) {
        MailConfig.port = port;
    }
 
    /**
     * @return Returns the userName.
     */
    public static String getUserName() {
        return userName;
    }
 
    /**
     * @param userName
     *            The userName to set.
     */
    @Value("${mail.userName}")
    public void setUserName(String userName) {
        MailConfig.userName = userName;
    }
 
    /**
     * @return Returns the passWord.
     */
    public static String getPassWord() {
        return passWord;
    }
 
    /**
     * @param passWord
     *            The passWord to set.
     */
    @Value("${mail.passWord}")
    public void setPassWord(String passWord) {
        MailConfig.passWord = passWord;
    }
 
    /**
     * @return Returns the emailForm.
     */
    public static String getEmailForm() {
        return emailForm;
    }
 
    /**
     * @param emailForm
     *            The emailForm to set.
     */
    @Value("${mail.emailForm}")
    public void setEmailForm(String emailForm) {
        MailConfig.emailForm = emailForm;
    }
 
    /**
     * @return Returns the timeout.
     */
    public static String getTimeout() {
        return timeout;
    }
 
    /**
     * @param timeout
     *            The timeout to set.
     */
    @Value("${mail.timeout}")
    public void setTimeout(String timeout) {
        MailConfig.timeout = timeout;
    }
 
    /**
     * @return Returns the personal.
     */
    public static String getPersonal() {
        return personal;
    }
 
    /**
     * @param personal
     *            The personal to set.
     */
    @Value("${mail.personal}")
    public void setPersonal(String personal) {
        MailConfig.personal = personal;
    }
 
    /**
     * @return Returns the html.
     */
    public static String getHtml() {
        return html;
    }
 
    /**
     * @param html
     *            The html to set.
     */
    @Value("${mail.html}")
    public void setHtml(String html) {
        MailConfig.html = html;
    }
 
    /**
     * @return Returns the subject.
     */
    public static String getSubject() {
        return subject;
    }
 
    /**
     * @param subject
     *            The subject to set.
     */
    @Value("${mail.subject}")
    public void setSubject(String subject) {
        MailConfig.subject = subject;
    }
 
}

springboot static property injection solution

The first way

Assign attributes (objects) through the springboot component initialization life cycle

@Component
public class DSHWechatApiUtil extends DSHBaseController {
    @Autowired
    private IThirdPartyAuthDao thirdPartyAuthDao;
    private static IThirdPartyAuthDao staticThirdPartyAuthDao;
    
    @PostConstruct
    public void init() {
        staticThirdPartyAuthDao = thirdPartyAuthDao;
    }
    public static JSONObject getAuthorizerToken(String componentAccessToken, String authorizerAppid, String authorizerRefreshToken) {
        JSONObject returnObject = new JSONObject();
        try {
            if (DSHUtils.isEmpty(componentAccessToken)) {
                componentAccessToken = staticThirdPartyAuthDao.selectWechatValue(DSHConstants.WECHAT_PARAMS.COMPONENT_ACCESS_TOKEN);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return returnObject;
    }
}

You can see that when the DSHWechatApiUtil tool class component is initialized, the method marked with the @PostConstruct annotation is called. Static variables are assigned values.

The second way

Through @Value() annotation

@Value() annotation will not inject attributes into static variables. By thinking in the first way, Then we must find a way to assign values ​​when this component is initialized.

The first method is certainly possible. First write a property, then assign the value to the property through the @Value() annotation, and finally assign the value to the static property through the @PostConstruct annotation.

Here we have to use another method. The method here is to assign values ​​through the set method. The attribute is statically modified, and the get method is also statically modified, but the set method cannot be statically modified. Use the @Value() annotation to modify the set method.

This will allow successful injection.

The third way

The third way is similar to the second way.

@ConfigurationProperties(prefix = ProjectConfig.PROJECT_PREFIX)
public class ProjectConfig {
    public static final String PROJECT_PREFIX = "project";
    /**
     * 系统版本号
     */
    private String version;
    /**
     * 项目名称
     */
    private String name;
    /**
     * 版权年份
     */
    private String copyrightYear;
    /**
     * 实例演示开关
     */
    private static boolean demoEnabled;
    /**
     * 获取地址ip开关
     */
    private static boolean addressEnabled;
    public String getVersion() {
        return version;
    }
    public void setVersion(String version) {
        this.version = version;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getCopyrightYear() {
        return copyrightYear;
    }
    public void setCopyrightYear(String copyrightYear) {
        this.copyrightYear = copyrightYear;
    }
    public boolean isDemoEnabled() {
        return demoEnabled;
    }
    public void setDemoEnabled(boolean demoEnabled) {
        ProjectConfig.demoEnabled = demoEnabled;
    }
    public static boolean isAddressEnabled() {
        return addressEnabled;
    }
    public void setAddressEnabled(boolean addressEnabled) {
        ProjectConfig.addressEnabled = addressEnabled;
    }
}

As shown in the above code, as long as the set method is set to non-static, then this configuration class The static properties can be injected successfully.

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