零基础全面解析SpringBoot配置文件(结合验证码案例)

server.port=9090

#配置项目端口号
server.port=9090
#配置数据库连接信息
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/testdb?characterEncoding=utf8&useSSL=false
spring.datasource.username=handsome
spring.datasource.password=boy

server.port=9090 
mykey=aa

@RequestMapping("/yml")
@RestController
public class ReadymlController {
    @Value("${mykey}")
    private String key;
    @RequestMapping("/readyml")
    public String readYml() {
        return "从yml中获取配置文件: "+key;
    }
}

rce: url: jdbc:mysql://127.0.0.0:3306/dbname?characterEncoding=utf8&useSSL=false username: root password: root

# 字符串
string.value: hello
# 布尔值, true或false
boolean.value: true
boolean.value1: false
# 整数
int.value: 520
# 浮点数
float.value: 13.14
# Null, ~代表 null
null.value: ~
#  空字符串
empty.value: ''
# 直接后面什么都不加也可以,但是这种方式不直观.更多的表⽰是使⽤引号
empty.value1:

server:
 port: 9090
str:
 value: hello

    @Value("${mykey}")
    private String key;
    @Value("${str.value}")
    private String string;
    @RequestMapping("/readymlstr")
    public String readYmlstr() {
        return "从yml中获取配置文件: "+string;
    }
    @RequestMapping("/readyml")
    public String readYml() {
        return "从yml中获取配置文件: "+key;
    }

string:
  str1: Hello \n Spring Boot.
  str2: 'Hello \n Spring Boot.'
  str3: "Hello \n Spring Boot."

    @Value("${string.str1}")
    private String str1;
    @Value("${string.str2}")
    private String str2;
    @Value("${string.str3}")
    private String str3;
    @RequestMapping("/readyml4")
    public String readYml4() {
        System.out.println(str1);
        System.out.println(str2);
        System.out.println(str3);
        return "从yml中获取配置文件";
    }

student:
  id: 1
  name: Java
  age: 18

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
/**
 * 配置对象
 */
@ConfigurationProperties(prefix = "student")//从配置文件中获取默认值.
@Component//交给spring管理
@Data
public class Student {
//    id: 1
//    name: Java
//    age: 18
    private Integer id;
    private String name;
    private Integer age;
}

@RequestMapping("/yml")
@RestController
public class ReadymlController {
    @Autowired
    private Student student;
     @RequestMapping("/readStudent")
    public String readStudent() {
        return "从yml中获取配置文件Student: "+student;
    }
}

dbtypes:
 name:
  - mysql
  - sqlserver
  - db2

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.List;
/**
 * 配置集合
 */
@ConfigurationProperties("dbtypes")
@Component
@Data
public class DbType {
    private List<String> name;
}

@RequestMapping("/yml")
@RestController
public class ReadymlController {
    @Autowired
    private DbType dbType;
    @RequestMapping("/readDbtype")
    public String readDbtype() {
        return "从yml中获取配置文件readDbtype: "+dbType;
    }
}

maptypes:
  map:
    k1: 1
    k2: 2
    k3: 3

import java.util.Map;
@ConfigurationProperties("maptypes")
@Component
@Data
public class MapType {
    private Map<String,String> map;
}

@RequestMapping("/yml")
@RestController
public class ReadymlController {
    @Autowired
    private MapType mapType;
        @RequestMapping("/readMaptype")
    public String readMaptype() {
        return "从yml中获取配置文件readMaptype: "+mapType;
    }
}

<dependency>
			<groupId>cn.hutool</groupId>
			<artifactId>hutool-captcha</artifactId>
			<version>5.8.16</version>
		</dependency>

<dependency>
			<groupId>cn.hutool</groupId>
			<artifactId>hutool-captcha</artifactId>
			<version>5.8.16</version>
		</dependency>

captcha:
  width: 200
  height: 100
  session:
    key: captcha_session_key
    date: captcha_session_date

@RequestMapping("/captcha")
@RestController
public class CaptchaController {
    private final static long session_valid_timeout = 60 * 1000;
    @Autowired
    private CaptchaProperties captchaProperties;
    @RequestMapping("/get")
    public void getCaptcha(HttpSession session, HttpServletResponse  response) {//响应中的所有数据都可以去 response中拿.
        LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(captchaProperties.getWidth(), captchaProperties.getHeight());
        //抓包发现该请求没有ContentType,但是 Spring 默认会返回 ContentType.
        response.setContentType("image/jpeg");
        //禁止缓存
        response.setHeader("Progma","No-cache");
        //图形验证码写出，可以写出到文件，也可以写出到流
        try {
            lineCaptcha.write(response.getOutputStream());
            String code = lineCaptcha.getCode();//拿到验证码答案.
            //存储sesion
            session.setAttribute(captchaProperties.getSession().getKey(),code);
            session.setAttribute(captchaProperties.getSession().getDate(),new Date());//记录设置session时的时间
            response.getOutputStream().close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    /*
    不同用户访问 /captcha/check , 拿到的session是不同的, 之前我们说过 sessionId 是唯一的.
    那么session是怎么拿到的呢? 先从 HttpServletRequest中拿了 cookie, 在从cookie中 拿 sessionId
    再根据 sessionId 拿到 session, 不同用户的 sessionId 不同, session自然不同。
    简单理解 就是程序本身支持多线程.
     */
    @RequestMapping("/check")
    public Boolean check(String inputCode, HttpSession session) {
        //验证码生成的内容, 和用户输入的进行比较
        //session 获取信息
        //校验
        if(!StringUtils.hasLength(inputCode)) {
            return false;
        }
        String saveCode = (String)session.getAttribute(captchaProperties.getSession().getKey());
        Date saveDate = (Date) session.getAttribute(captchaProperties.getSession().getDate());
        if(saveCode.equalsIgnoreCase(inputCode)) {
            //判断验证码是否过期
            if(saveDate != null && System.currentTimeMillis()- saveDate.getTime() < session_valid_timeout) {
                return true;
            }
        }
        return false;
    }
}

    $("#checkCaptcha").click(function () {
        $.ajax({
          url: "captcha/check",
          type: "post",
          data: {
            inputCode: $("#inputCaptcha").val()
          },
          success:function(result) {
            if(result==true) {
              location.href="success.html" rel="external nofollow" ;
            }else {
              alert("验证码错误或者过期");
            }
          }
        });
    });