转：
Druid是一个强大的新兴数据库连接池,兼容DBCP，是阿里巴巴做的开源项目.
不仅提供了强悍的数据源实现,还内置了一个比较靠谱的监控组件。
GitHub项目主页: https://github.com/alibaba/druid
QQ群: 点击链接加入群【阿里开源技术交流】
演示地址: https://cncounter.duapp.com/druid/index.html
常见问题回答请参考: https://github.com/alibaba/druid/wiki/%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98
一篇CSDN对Druid的介绍 druid简单教程
因为想要监控数据,又不愿意谁都可以访问,所以想要配置个密码.在开源群里一问,就知道原来内部已经有实现了.
先贴完成后的代码:
web.xml 部分:
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<!-- Druid,监控数据库,以及WEB访问连接信息 --><!-- 参考: https://github.com/alibaba/druid/wiki/%E9%85%8D%E7%BD%AE_%E9%85%8D%E7%BD%AEWebStatFilter --><filter> <filter-name>DruidWebStatFilter</filter-name> <filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class> <init-param> <param-name>exclusions</param-name> <param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,*.jsp,/druid/*,/download/*</param-value> </init-param> <init-param> <param-name>sessionStatMaxCount</param-name> <param-value>2000</param-value> </init-param> <init-param> <param-name>sessionStatEnable</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>principalSessionName</param-name> <param-value>session_user_key</param-value> </init-param> <init-param> <param-name>profileEnable</param-name> <param-value>true</param-value> </init-param></filter><filter-mapping> <filter-name>DruidWebStatFilter</filter-name> <url-pattern>/*</url-pattern></filter-mapping><!-- 配置 Druid 监控信息显示页面 --><servlet> <servlet-name>DruidStatView</servlet-name> <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class> <init-param> <!-- 允许清空统计数据 --> <param-name>resetEnable</param-name> <param-value>true</param-value> </init-param> <init-param> <!-- 用户名 --> <param-name>loginUsername</param-name> <param-value>druid</param-value> </init-param> <init-param> <!-- 密码 --> <param-name>loginPassword</param-name> <param-value>druid</param-value> </init-param></servlet><servlet-mapping> <servlet-name>DruidStatView</servlet-name> <url-pattern>/druid/*</url-pattern></servlet-mapping> |
首先,因为使用的是 MAVEN, 所以查看源码时maven会自动帮你下载. 我们在 web.xml 中点击 com.alibaba.druid.support.http.StatViewServlet 进入class文件,等一会源码下载好就可以查看. 发现有类似下面这样的代码:
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public class StatViewServlet extends ResourceSerlvet { private final static Log LOG = LogFactory.getLog(StatViewServlet.class); private static final long serialVersionUID = 1L; public static final String PARAM_NAME_RESET_ENABLE = "resetEnable"; public static final String PARAM_NAME_JMX_URL = "jmxUrl"; public static final String PARAM_NAME_JMX_USERNAME = "jmxUsername"; public static final String PARAM_NAME_JMX_PASSWORD = "jmxPassword"; private DruidStatService statService = DruidStatService.getInstance(); /** web.xml中配置的jmx的连接地址 */ private String jmxUrl = null; /** web.xml中配置的jmx的用户名 */ private String jmxUsername = null; /** web.xml中配置的jmx的密码 */ private String jmxPassword = null;......... |
而在其中的 jmxUrl、jmxUsername 和 jmxPassword 很显然是连接远程 JMX时使用的,那么我就想着去看看父类: com.alibaba.druid.support.http.ResourceSerlvet
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@SuppressWarnings("serial")public abstract class ResourceSerlvet extends HttpServlet { private final static Log LOG = LogFactory.getLog(ResourceSerlvet.class); public static final String SESSION_USER_KEY = "druid-user"; public static final String PARAM_NAME_USERNAME = "loginUsername"; public static final String PARAM_NAME_PASSWORD = "loginPassword"; public static final String PARAM_NAME_ALLOW = "allow"; public static final String PARAM_NAME_DENY = "deny"; public static final String PARAM_REMOTE_ADDR = "remoteAddress"; protected String username = null; protected String password = null;.......... |
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public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ...... if (isRequireAuth() // && !ContainsUser(request)// && !("/login.html".equals(path) // || path.startsWith("/css")// || path.startsWith("/js") // || path.startsWith("/img"))) { if (contextPath == null || contextPath.equals("") || contextPath.equals("/")) { response.sendRedirect("/druid/login.html"); } else { if ("".equals(path)) { response.sendRedirect("druid/login.html"); } else { response.sendRedirect("login.html"); } } return; }...... |
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public boolean isRequireAuth() { return this.username != null;} |
那现在知道是 username 在作怪,也设置了,但是没有起作用,于是搜索 username ,
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public void init() throws ServletException { initAuthEnv();}private void initAuthEnv() { String paramUserName = getInitParameter(PARAM_NAME_USERNAME); if (!StringUtils.isEmpty(paramUserName)) { this.username = paramUserName; } String paramPassword = getInitParameter(PARAM_NAME_PASSWORD); if (!StringUtils.isEmpty(paramPassword)) { this.password = paramPassword; } ...... |
String paramUserName = getInitParameter(PARAM_NAME_USERNAME);
那么很简单,找到 PARAM_NAME_USERNAME 即可: public static final String PARAM_NAME_USERNAME = "loginUsername"; public static final String PARAM_NAME_PASSWORD = "loginPassword";
于是在 web.xml 中换上,OK，成功进行了拦截.