public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) { String requestId = UUID.randomUUID().toString(); try { MDC.put("requestId", requestId); MDC.put("clientIp", request.getRemoteAddr()); // 继续处理请求 chain.doFilter(request, response); } finally { ...
“申请” 一个 Connection。如果连接池中有空闲的 Connection,则将其返回,否则创建新的Connection。使用完毕后,连接池会将该 Connection 回收,并交付其他的线程使用,以减少创建和断开数据库连接的次数,提高数据库的访问效率。 DataSource 接口 为了获取数据库连接对象(Connection),JDBC 提供了 javax.sql.Datasource 接口...
Operations requested through POST can have side effects for which the user can be held accountable, for example, updating stored data or buying items online. If the HTTP POST request is incorrectly formatted, doPost returns an HTTP "Bad Request" message. Parameters: req - an HttpServletRequest...
org.springframework.faces.webflow.JsfFlowHandlerAdapter#0,faceletsViewResolver,org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter#0,securityFlowExecutionListener]; root of factory hierarchy
String tempGisEngineUrl= "http://sun:8080/helloapp/hello?name=中国";//hello是在servlet项目中web.xml中配置的url访问别名。URL imsServerURL =newURL(tempGisEngineUrl); HttpURLConnection imsConnection=(HttpURLConnection) imsServerURL .openConnection(); ...
Java Servlet API:Manages requests and responses in a web server. JavaServer Pages (JSP):Enables the creation of dynamic, platform-independent web content. Java Message Service (JMS):Facilitates the creation, sending, receiving, and reading of messages in Java programs. ...
A servlet that needs to establish a connection to a database can use its init parameters to define the details of the connection. We can assume a custom establishConnection( ) method to abstract away the details of JDBC, as shown in Example 4-1. Example 4-1. Using init Parameters to Es...
Building, Packaging, Deploying, and Running the converter ExampleNow you are ready to compile the enterprise bean class (ConverterBean.java) and the servlet class (ConverterServlet.java) and to package the compiled classes into a WAR file.
Applet/Midlet/Servlet lifecycle events1 This bridging between callback and security-sensitive operations is particularly tricky because it is not easy to spot the bug or to work out where it is. When implementing callback types, use the technique described in Guideline 9-6 to transfer context....
While Apache Tomcat is the most popular application server, it offers a limited set of features from the Jakarta EE Full Profile specification, such as Java Servlet or JavaServer Pages. For some enterprise applications, however, that limited feature set might not be enough. Benefits of WebLogic ...