# 設(shè)置項目啟動端口 
server.port=8080 
# 數(shù)據(jù)庫連接配置
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/testdb
spring.datasource.username=root

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RequestMapping("/prop")
@RestController
public class PropertiesController {
    @Value("${spring.datasource.url}")
    private String url;
    @RequestMapping("/read")
    public String readProperties() {
        return "從配置文件中讀取url" + url;
    }
}

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RequestMapping("/yaml")
@RestController
public class yamlController {
    @Value("${yaml}")
    private String yaml;
    @Value("${spring.datasource.username}")
    private String username;
    @Value("${spring.datasource.password}")
    private String password;
    @RequestMapping("/read")
    public String read() {
        System.out.println(yaml);
        System.out.println(username);
        System.out.println(password);
        return "success";
    }
}

student:
  id: 1
  name: Java
  age: 18

@Data
@ConfigurationProperties(prefix = "student")  // 會從配置文件中找到student的前綴
@Configuration
public class Student {
    private Integer id;
    private String name;
    private Integer age;
}

dbtypes:
  name:
    - mysql
    - sqlserver
    - db2
  map:
    k1: kk1
    k2: kk2
    k3: kk3

@Data
@ConfigurationProperties(prefix = "dbtypes")
@Configuration
public class DbTypeConfig {
    private List<String> name;
    private Map<String, String> map;
}

spring:
  application:
    name: spring-captcha-demo
captcha:
  width: 100
  height: 40
#  通過設(shè)置session配置項，避免日后需要到處修改
  session:
    code: SESSION_CODE_KEY
    date: SESSION_DATE_KEY

import cn.hutool.captcha.CaptchaUtil;
import cn.hutool.captcha.LineCaptcha;
import cn.overthinker.spring.captcha.demo.model.CaptchaProperties;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.io.IOException;
@RestController
@RequestMapping("/captcha")
public class CaptchaController {
    @Autowired
    private CaptchaProperties captchaProperties;
    private  static long VILD_MiLLTS_TIME = 5 * 60 * 1000;
    @RequestMapping("/getCaptcha")
    public void genCaptcha(HttpServletRequest request, HttpServletResponse response) {
        //定義圖形驗證碼的長和寬
        LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(captchaProperties.getWidth(), captchaProperties.getHeight());
        String code = lineCaptcha.getCode();
        System.out.println(code);
        //圖形驗證碼寫出，可以寫出到文件，也可以寫出到流
        try {
            response.setContentType("image/jpeg");
            response.setHeader("Pragma", "No-cache");
            lineCaptcha.write(response.getOutputStream());
            //拿到這個請求的session，并且將code寫入到session
            HttpSession session = request.getSession();
            session.setAttribute(captchaProperties.getSession().getCode(), code);
            //記錄時間保持五分鐘內(nèi)有效
            session.setAttribute(captchaProperties.getSession().getDate(), System.currentTimeMillis());
            response.getOutputStream().close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    @RequestMapping("/check")
    public Boolean checkCaptcha(String captcha, HttpSession session) {
        //先判斷是否為空
        if(!StringUtils.hasLength(captcha)) {
            return false;
        }
        // 從session中獲取code和時間
        String code = session.getAttribute(captchaProperties.getSession().getCode()).toString();
        long data = (long)session.getAttribute(captchaProperties.getSession().getDate());
        if(captcha.equalsIgnoreCase(code) && (System.currentTimeMillis() - data < VILD_MiLLTS_TIME)) {
            return true;
        }
        return false;
    }
}

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>驗證碼</title>
  <style>
    #inputCaptcha {
      height: 30px;
      vertical-align: middle; 
    }
    #verificationCodeImg{
      vertical-align: middle; 
    }
    #checkCaptcha{
      height: 40px;
      width: 100px;
    }
  </style>
</head>
<body>
  <h1>輸入驗證碼</h1>
  <div id="confirm">
    <input type="text" name="inputCaptcha" id="inputCaptcha">
    <img id="verificationCodeImg" src="/captcha/getCaptcha" style="cursor: pointer;" title="看不清？換一張" />
    <input type="button" value="提交" id="checkCaptcha">
  </div>
  <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
  <script>
    $("#verificationCodeImg").click(function(){
      $(this).hide().attr('src', '/captcha/getCaptcha?dt=' + new Date().getTime()).fadeIn();
    });
    $("#checkCaptcha").click(function () {
        // alert("驗證碼校驗");
        $.ajax({
          url:'/captcha/check',
          type:'post',
          data:{
            captcha:$('#inputCaptcha').val()
          },
          success:function (result) {
            if(result){
              location.href = 'success.html';
            }else {
              alert("驗證碼錯誤！");
            }
          }
        });
    });
  </script>
</body>
</html>