Servlet Workspace Location Example

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This is input.properties properties file and these properties are used in the application.

portNumber=7070

This is index.jsp JSP file and it is used display the output for the application.

<jsp:forward page="/WorkspaceLocationServlet"></jsp:forward>

This is WorkspaceLocationServlet.java file having the source code to execute business logic.

package com.cv.servlet.workspace; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.log4j.Logger; /**  * Servlet implementation class WorkspaceLocationServlet  *   * @author Chandra Vardhan  *  */ public class WorkspaceLocationServlet extends HttpServlet {   private static final Logger LOGGER = Logger.getLogger(WorkspaceLocationServlet.class);   private static final long serialVersionUID = 1L;   /**    * @see HttpServlet#HttpServlet()    */   public WorkspaceLocationServlet() {     super();   }   /**    * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse    *      response)    */   public void doGet(HttpServletRequest request, HttpServletResponse response)       throws ServletException, IOException {     LOGGER.info("Entered into doGet(--) of WorkspaceLocationServlet class... ");     response.setContentType("text/html");     String contextPath = this.getClass().getClassLoader().getResource("/").getPath();        if(contextPath != null) {       contextPath = contextPath.substring(0, contextPath.lastIndexOf(".metadata")-1);       if(contextPath.startsWith("\\")) {         contextPath = contextPath.substring(1, contextPath.length());       }       contextPath = contextPath+request.getContextPath();     }          File file = new File(contextPath+"//input.properties");     if (file != null && !file.exists()) {       file.createNewFile();     }     final PrintWriter pw = new PrintWriter(new FileOutputStream(file));     pw.print("portNumber=" + request.getServerPort());     PrintWriter out = response.getWriter();     out.print("Successfully deployed and content will be written to file...");     pw.close();     out.close();   }   /**    * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse    *      response)    */   protected void doPost(HttpServletRequest request,       HttpServletResponse response) throws ServletException, IOException {     LOGGER.info("Entered into doPost(--) of ImageServlet class... ");     doGet(request, response);   } }

This is pom.xml file having the entries of dependency jars and information to build the application .

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.cv.servlet.download</groupId> <artifactId>ServletWorkspaceLocationExample</artifactId> <version>1.0</version> <packaging>war</packaging> <properties> <log4j-version>1.2.16</log4j-version> <java.version>1.8</java.version> </properties> <build> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.3</version> <configuration> <source>${java.version}</source> <target>${java.version}</target> </configuration> </plugin> <plugin> <artifactId>maven-war-plugin</artifactId> <version>2.6</version> <configuration> <warSourceDirectory>src/main/webapp</warSourceDirectory> <failOnMissingWebXml>false</failOnMissingWebXml> </configuration> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>3.0-alpha-1</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> </dependencies> </project>

This is web.xml deployment descriptor file and it describes how the web application should be deployed.

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <display-name>WorkspaceLocationServlet</display-name> <servlet> <servlet-name>WorkspaceLocationServlet</servlet-name> <servlet-class>com.cv.servlet.workspace.WorkspaceLocationServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>WorkspaceLocationServlet</servlet-name> <url-pattern>/WorkspaceLocationServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>

This is log4j.properties file having the entries for logging the information into the console/file.

#By default enabling Console appender # Root logger option log4j.rootLogger=INFO, stdout # Redirect log messages to console log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%-5p [%c]:%L -->> %m%n # Redirect log messages to a log file #log4j.appender.file=org.apache.log4j.RollingFileAppender #log4j.appender.file.File=C:\servlet-application.log #log4j.appender.file.MaxFileSize=5MB #log4j.appender.file.MaxBackupIndex=10 #log4j.appender.file.layout=org.apache.log4j.PatternLayout #log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n