Adding examples for Custom tags

AtulDwivedi · Nov 3, 2016 · 149c035 · 149c035
1 parent bfbc920
commit 149c035
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diff --git a/.gitignore b/.gitignore
@@ -1,7 +1,7 @@
 /bin
 /build
 /WebContent/WEB-INF/lib
-/WebContentMETA-INF
+/WebContent/META-INF
 .settings
 .project
 .classpath

diff --git a/WebContent/WEB-INF/bts.tld b/WebContent/WEB-INF/bts.tld
@@ -0,0 +1,21 @@
+<taglib>
+	<tlib-version>1.0</tlib-version>
+	<jsp-version>1.2</jsp-version>
+	<uri>http://atuldwivedi.com/ctsg1</uri>
+	<tag>
+		<name>expandAbr</name>
+		<tag-class>com.atuldwivedi.learnjsp.customtag.ExpandAbbreviationTag</tag-class>
+		<body-content>jsp</body-content>
+		</tag>
+
+		<tag>
+		<name>countword</name>
+		<tag-class>com.atuldwivedi.learnjsp.customtag.CountWordTag</tag-class>
+		<body-content>jsp</body-content>
+		<attribute>
+			<name>word</name>
+			<required>true</required>
+			<rtexprvalue>true</rtexprvalue>
+		</attribute>
+	</tag>
+</taglib>
diff --git a/WebContent/WEB-INF/err.tld b/WebContent/WEB-INF/err.tld
@@ -0,0 +1,15 @@
+<taglib>
+	<tlib-version>1.0</tlib-version>
+	<jsp-version>1.2</jsp-version>
+	<uri>http://atuldwivedi.com/ctags</uri>
+	<tag>
+		<name>loginError</name>
+		<tag-class>com.atuldwivedi.learnjsp.customtag.ErrorTagHandler</tag-class>
+		<body-content>empty</body-content>
+		<attribute>
+			<name>property</name>
+			<required>true</required>
+			<rtexprvalue>false</rtexprvalue>
+		</attribute>
+	</tag>
+</taglib>
diff --git a/WebContent/WEB-INF/files/Model 1 Architecture.jpg b/WebContent/WEB-INF/files/Model 1 Architecture.jpg
diff --git a/WebContent/WEB-INF/files/Model 2 Architecture.jpg b/WebContent/WEB-INF/files/Model 2 Architecture.jpg
diff --git a/WebContent/WEB-INF/files/Ticket.pdf b/WebContent/WEB-INF/files/Ticket.pdf
diff --git a/WebContent/WEB-INF/greet.tld b/WebContent/WEB-INF/greet.tld
@@ -0,0 +1,16 @@
+<taglib>
+	<tlib-version>1.0</tlib-version>
+	<jsp-version>1.2</jsp-version>
+	<uri>http://atuldwivedi.com/ctag</uri>
+	<tag>
+		<name>greet</name>
+		<tag-class>com.atuldwivedi.learnjsp.customtag.GreetTagHandler
+		</tag-class>
+		<body-content>empty</body-content>
+		<attribute>
+			<name>uname</name>
+			<required>true</required>
+			<rtexprvalue>true</rtexprvalue>
+		</attribute>
+	</tag>
+</taglib>
diff --git a/WebContent/WEB-INF/web.xml b/WebContent/WEB-INF/web.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
+  <display-name>LearnJSP</display-name>
+  <welcome-file-list>
+    <welcome-file>index.html</welcome-file>
+    <welcome-file>index.htm</welcome-file>
+    <welcome-file>index.jsp</welcome-file>
+    <welcome-file>default.html</welcome-file>
+    <welcome-file>default.htm</welcome-file>
+    <welcome-file>default.jsp</welcome-file>
+  </welcome-file-list>
+</web-app>
diff --git a/WebContent/custom-tags/body-tag-support.jsp b/WebContent/custom-tags/body-tag-support.jsp
@@ -0,0 +1,20 @@
+<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
+	pageEncoding="ISO-8859-1"%>
+<%@ taglib prefix="bts" uri="http://atuldwivedi.com/ctsg1"%>
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>Learn BodyTagSupport</title>
+</head>
+<body>
+	<h1>
+		<bts:expandAbr>Learn JSP</bts:expandAbr>
+	</h1>
+
+		<bts:countword word="JSP">
+		JSP stands for Java Server Pages. JSP is extension of Servlet. JSP is used to develop dynamic web applications.
+		</bts:countword>
+
+</body>
+</html>
diff --git a/WebContent/custom-tags/greet.jsp b/WebContent/custom-tags/greet.jsp
@@ -0,0 +1,14 @@
+<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
+	pageEncoding="ISO-8859-1"%>
+<%@ taglib prefix="g" uri="http://atuldwivedi.com/ctag"%>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>Learn Custom Tags</title>
+</head>
+<body>
+	<g:greet uname="Atul" />
+	<br>
+	<g:greet uname="" />
+</body>
+</html>
diff --git a/WebContent/custom-tags/home.jsp b/WebContent/custom-tags/home.jsp
@@ -0,0 +1,12 @@
+<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
+    pageEncoding="ISO-8859-1"%>
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>Welcome Home!</title>
+</head>
+<body>
+<h1>You have logged in successfully!</h1>
+</body>
+</html>
diff --git a/WebContent/custom-tags/login.jsp b/WebContent/custom-tags/login.jsp
@@ -0,0 +1,18 @@
+<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
+	pageEncoding="ISO-8859-1"%>
+<%@ taglib prefix="err" uri="http://atuldwivedi.com/ctags"%>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>Learn Custom Tags</title>
+</head>
+<body>
+	<form action="CTagsLoginServlet" method="post">
+		<label>User Name:</label><input type="text" name="userName" />
+		<font color="red"><err:loginError property="userName" /></font>
+		<br /> <label>Password:</label><input type="password" name="password" />
+		<font color="red"><err:loginError property="password" /></font>
+		<br /> <input type="submit" value="Login" />
+	</form>
+</body>
+</html>
diff --git a/src/com/atuldwivedi/learnjsp/customtag/CountWordTag.java b/src/com/atuldwivedi/learnjsp/customtag/CountWordTag.java
@@ -0,0 +1,52 @@
+package com.atuldwivedi.learnjsp.customtag;
+
+import java.io.Writer;
+
+import javax.servlet.jsp.JspException;
+import javax.servlet.jsp.tagext.BodyTagSupport;
+
+public class CountWordTag extends BodyTagSupport {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
+
+	private String word;
+
+	@Override
+	public int doEndTag() throws JspException {
+		try {
+			String str = getBodyContent().getString();
+			Writer out = pageContext.getOut();
+			out.write(word +" count is: "+ countWord(str));
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+		return EVAL_PAGE;
+	}
+
+	@Override
+	public int doStartTag() throws JspException {
+		return EVAL_BODY_BUFFERED;
+	}
+
+	public void setWord(String word) {
+		this.word = word;
+	}
+
+	private int countWord(String str){
+		int count = 0;
+
+		for (int i = 0; i < str.length(); i++) {
+			int index = str.indexOf(word, i);
+			if(index >= 0){
+				count++;
+				i = index + 1;
+			}
+		}
+		System.out.println(count);
+		return count;
+	}
+
+}
diff --git a/src/com/atuldwivedi/learnjsp/customtag/ErrorTagHandler.java b/src/com/atuldwivedi/learnjsp/customtag/ErrorTagHandler.java
@@ -0,0 +1,32 @@
+package com.atuldwivedi.learnjsp.customtag;
+
+import java.io.Writer;
+
+import javax.servlet.jsp.JspException;
+import javax.servlet.jsp.tagext.TagSupport;
+
+public class ErrorTagHandler extends TagSupport {
+
+	private static final long serialVersionUID = 1L;
+
+	private String property;
+
+	public void setProperty(String property) {
+		this.property = property;
+	}
+
+	@Override
+	public int doEndTag() throws JspException {
+		try {
+			Object message = pageContext.findAttribute(property);
+			if (message != null) {
+				Writer out = pageContext.getOut();
+				out.write(message.toString());
+			}
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+
+		return super.doEndTag();
+	}
+}
diff --git a/src/com/atuldwivedi/learnjsp/customtag/ExpandAbbreviationTag.java b/src/com/atuldwivedi/learnjsp/customtag/ExpandAbbreviationTag.java
@@ -0,0 +1,34 @@
+package com.atuldwivedi.learnjsp.customtag;
+
+import java.io.Writer;
+
+import javax.servlet.jsp.JspException;
+import javax.servlet.jsp.tagext.BodyTagSupport;
+
+public class ExpandAbbreviationTag extends BodyTagSupport {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
+
+	@Override
+	public int doEndTag() throws JspException {
+		String bodyContent = getBodyContent().getString();
+		int index = bodyContent.indexOf("JSP");
+		String subString = bodyContent.substring(0, index - 1);
+
+		try {
+			Writer out = pageContext.getOut();
+			out.write(subString +" "+ "Java Server Pages");
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+		return EVAL_PAGE;
+	}
+
+	@Override
+	public int doStartTag() throws JspException {
+		return EVAL_BODY_BUFFERED;
+	}
+}
diff --git a/src/com/atuldwivedi/learnjsp/customtag/GreetTagHandler.java b/src/com/atuldwivedi/learnjsp/customtag/GreetTagHandler.java
@@ -0,0 +1,31 @@
+package com.atuldwivedi.learnjsp.customtag;
+
+import java.io.IOException;
+import java.io.Writer;
+import javax.servlet.jsp.JspException;
+import javax.servlet.jsp.tagext.TagSupport;
+
+public class GreetTagHandler extends TagSupport {
+
+	private static final long serialVersionUID = 1L;
+	private String uname;
+
+	public void setUname(String uname) {
+		this.uname = uname;
+	}
+
+	@Override
+	public int doEndTag() throws JspException {
+		Writer out = pageContext.getOut();
+		try {
+			if (uname == null || uname.trim().isEmpty()) {
+				out.write("You have not specified your name.");
+			} else {
+				out.write("Hello " + uname);
+			}
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		return super.doEndTag();
+	}
+}
diff --git a/src/com/atuldwivedi/learnjsp/servlet/BodyTagSupportServlet.java b/src/com/atuldwivedi/learnjsp/servlet/BodyTagSupportServlet.java
@@ -0,0 +1,32 @@
+package com.atuldwivedi.learnjsp.servlet;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * Servlet implementation class BodyTagSupportServlet
+ */
+@WebServlet("/BodyTagSupportServlet")
+public class BodyTagSupportServlet extends HttpServlet {
+	private static final long serialVersionUID = 1L;
+
+    /**
+     * @see HttpServlet#HttpServlet()
+     */
+    public BodyTagSupportServlet() {
+        super();
+        // TODO Auto-generated constructor stub
+    }
+
+	/**
+	 * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
+	 */
+	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+		request.getRequestDispatcher("custom-tag/body-tag-support.jsp").forward(request, response);
+	}
+
+}
diff --git a/src/com/atuldwivedi/learnjsp/servlet/CTagsLoginServlet.java b/src/com/atuldwivedi/learnjsp/servlet/CTagsLoginServlet.java
@@ -0,0 +1,55 @@
+package com.atuldwivedi.learnjsp.servlet;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * Servlet implementation class CTagsLoginServlet
+ */
+@WebServlet("/CTagsLoginServlet")
+public class CTagsLoginServlet extends HttpServlet {
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * @see HttpServlet#HttpServlet()
+	 */
+	public CTagsLoginServlet() {
+		super();
+		// TODO Auto-generated constructor stub
+	}
+
+	/**
+	 * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse
+	 *      response)
+	 */
+	protected void doPost(HttpServletRequest request,
+			HttpServletResponse response) throws ServletException, IOException {
+		// TODO Auto-generated method stub
+		String userName = request.getParameter("userName");
+		String password = request.getParameter("password");
+
+		boolean err = false;
+		String page = "custom-tags/login.jsp";
+
+		if (userName == null || userName.trim().length() == 0) {
+			request.setAttribute("userName", "User name is mandatory");
+			err = true;
+		}
+
+		if (password == null || password.trim().length() == 0) {
+			request.setAttribute("password", "Password is mandatory");
+			err = true;
+		}
+
+		if (!err) {
+			page = "custom-tags/home.jsp";
+		}
+		request.getRequestDispatcher(page).forward(
+				request, response);
+	}
+
+}