<dependency>
	 <groupId>com.alibaba</groupId>
	 <artifactId>druid</artifactId>
	 <version>1.1.21</version>
</dependency>

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid-spring-boot-starter</artifactId>
	<version>1.1.21</version>
</dependency>

spring:
  datasource:
 	  # 基本屬性
      name: dev
      url: jdbc:mysql://127.0.0.1:3306/test?autoReconnect=true&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&zeroDateTimeBehavior=convertToNull&useSSL=false
      username: root
      password: root
      # 可以不配置，根據(jù)url自動(dòng)識(shí)別，建議配置
      driver-class-name: com.mysql.jdbc.Driver
      ###################以下為druid增加的配置###########################
      type: com.alibaba.druid.pool.DruidDataSource
      # 初始化連接池個(gè)數(shù)
      initialSize: 5
      # 最小連接池個(gè)數(shù)——》已經(jīng)不再使用，配置了也沒效果
      minIdle: 2
      # 最大連接池個(gè)數(shù)
      maxActive: 20
      # 配置獲取連接等待超時(shí)的時(shí)間，單位毫秒，缺省啟用公平鎖，并發(fā)效率會(huì)有所下降
      maxWait: 60000
      # 配置間隔多久才進(jìn)行一次檢測(cè)，檢測(cè)需要關(guān)閉的空閑連接，單位是毫秒
      timeBetweenEvictionRunsMillis: 60000
      # 配置一個(gè)連接在池中最小生存的時(shí)間，單位是毫秒
      minEvictableIdleTimeMillis: 300000
      # 用來檢測(cè)連接是否有效的sql，要求是一個(gè)查詢語(yǔ)句。
      # 如果validationQuery為null，testOnBorrow、testOnReturn、testWhileIdle都不會(huì)起作用
      validationQuery: SELECT 1 FROM DUAL
      # 建議配置為true，不影響性能，并且保證安全性。
      # 申請(qǐng)連接的時(shí)候檢測(cè)，如果空閑時(shí)間大于timeBetweenEvictionRunsMillis，執(zhí)行validationQuery檢測(cè)連接是否有效。
      testWhileIdle: true
      # 申請(qǐng)連接時(shí)執(zhí)行validationQuery檢測(cè)連接是否有效，做了這個(gè)配置會(huì)降低性能
      testOnBorrow: false
      # 歸還連接時(shí)執(zhí)行validationQuery檢測(cè)連接是否有效，做了這個(gè)配置會(huì)降低性能
      testOnReturn: false
      # 打開PSCache，并且指定每個(gè)連接上PSCache的大小
      poolPreparedStatements: true
      maxPoolPreparedStatementPerConnectionSize: 20
      # 通過別名的方式配置擴(kuò)展插件，多個(gè)英文逗號(hào)分隔，常用的插件有： 
      # 監(jiān)控統(tǒng)計(jì)用的filter:stat
      # 日志用的filter:log4j
      # 防御sql注入的filter:wall
      filters: stat,wall,log4j #log4j 
      # 通過connectProperties屬性來打開mergeSql功能；慢SQL記錄
      connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
      # 合并多個(gè)DruidDataSource的監(jiān)控?cái)?shù)據(jù)
      useGlobalDataSourceStat: true

@Configuration
public class DruidConfig {
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DruidDataSource druidDataSource(){
        return new DruidDataSource();
    }
}

@WebFilter(filterName="druidWebStatFilter",urlPatterns="/*",
        initParams={
                @WebInitParam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*,/font-awesome/*")// 忽略資源
        })
public class DruidStatFilter extends WebStatFilter {
}

@WebServlet(urlPatterns = "/druid/*",
        initParams={
                @WebInitParam(name="allow",value="127.0.0.1"),// IP白名單 (沒有配置或者為空，則允許所有訪問)
                @WebInitParam(name="deny",value=""),// IP黑名單 (存在共同時(shí)，deny優(yōu)先于allow)
                @WebInitParam(name="loginUsername",value="root"),// 用戶名
                @WebInitParam(name="loginPassword",value="root"),// 密碼
                @WebInitParam(name="resetEnable",value="false")// 禁用HTML頁(yè)面上的“Reset All”功能
        })
public class DruidStatViewServlet extends StatViewServlet {
}

<form id="loginForm" >
	...省略...
	<input type="text" name="loginUsername">
	<input type="password" name="loginPassword">
	<button>提交</button>
	...省略...
</form>

  $.namespace("druid.login");
       druid.login = function () {  
           return  {
              login : function() {
                  $.ajax({
                    type: 'POST',
                    url: "submitLogin",
                    data: $("#loginForm").serialize(),
                    success: function(data) {
                      if("success" == data)
                          location.href = "index.html";
                      else {
                          $("#alertInfo").show();
                          $("#loginForm")[0].reset();
                      }
                    },
                    dataType: "text"
                  });
              }
           }
      }();
      $(document).ready(function() {
          $("#loginBtn").click(druid.login.login);
     });

@RequestMapping("/toDruidLogin")
public String toDruidLogin(){
   return "druidlogin";
}

<script th:src="@{https://code.jquery.com/jquery-3.4.1.min.js}" type="text/javascript"></script>
<script type="text/javascript">
	$(document).ready(function(){
		$.ajax({
	      type: 'get',
	      url: '/doDruidLogin',
	      dataType: "text",
	      data: {},
	      success: function (data) {
	          if (data == "success") {
	              location.href = "/druid";
	          } else 
	          		//其他邏輯省略
	          }
	      }, 
	      error: function () {
	      		//其他邏輯省略
	      }
	  });
	});
</script>

 @RequestMapping("/doDruidLogin")
 public String doDruidLogin(){
 	 //不會(huì)執(zhí)行，但要攔截/doDruidLogin，不然會(huì)報(bào)錯(cuò)
     return "/";
 }

@WebFilter(filterName = "Moni",urlPatterns = "/doDruidLogin")
public class DruidLoginFilter implements Filter {
	private static final Logger log = LoggerFactory.getLogger(DruidLoginFilter.class);
	@Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("DruidLoginFilter初始化");
    }
	 @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = ((HttpServletResponse) servletResponse);
        String requestUrl = request.getRequestURL().toString();
        //log.info(requestUrl);
        // 針對(duì)druid做自動(dòng)登錄
        if(requestUrl.contains("/doDruidLogin")){
            String queryString = "loginUsername=root&loginPassword=root";
            // 獲取完整路徑
          //  log.info("====="+requestUrl);
            StringBuffer url = new StringBuffer(requestUrl);
            // 獲取路徑加上項(xiàng)目名稱
            String tempContextUrl = url.delete(url.length() - request.getRequestURI().length(), url.length()).append(request.getServletContext().getContextPath()).append("/").toString();
          //  log.info(tempContextUrl);
            /** 構(gòu)造新地址，其實(shí)就是druid的登錄地址 */
            URL newUrl = new URL(tempContextUrl + "druid/submitLogin?" + queryString);
           // log.info(newUrl.toString());
            response.setStatus(307);
            response.setHeader("Location", newUrl.toString());
            response.setHeader("Connection", "close");
            //允許所有跨域請(qǐng)求
            response.addHeader("Access-Control-Allow-Origin", "*");
        }else {
            chain.doFilter(request,response);
        }
    }
    @Override
    public void destroy() {
        log.info("DruidLoginFilter銷毀");
    }
}

response.setStatus(307);
response.setHeader("Location", newUrl.toString());
response.setHeader("Connection", "close");