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>
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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
;
.........
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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
;
}
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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;
}
......
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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.