MyEclipse使用总结——修改MyEclipse默认的Servlet和jsp代码模板
一、修改Servlet的默认模板代码
使用MyEclipse创建Servlet时，根据默认的Servlet模板生成的Servlet代码如下：
1 package gacl.servlet.study; 2 3 import java.io.IOException; 4 import java.io.PrintWriter; 5 6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse; 10 11 public class ServletDefaultTemplateCode extends HttpServlet { 12 13 /** 14 * The doGet method of the servlet. <br> 15 * 16 * This method is called when a form has its tag value method equals to get. 17 * 18 * @param request the request send by the client to the server 19 * @param response the response send by the server to the client 20 * @throws ServletException if an error occurred 21 * @throws IOException if an error occurred 22 */ 23 public void doGet(HttpServletRequest request, HttpServletResponse response) 24 throws ServletException, IOException { 25 26 response.setContentType("text/html"); 27 PrintWriter out = response.getWriter(); 28 out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); 29 out.println("<HTML>"); 30 out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); 31 out.println(" <BODY>"); 32 out.print(" This is "); 33 out.print(this.getClass()); 34 out.println(", using the GET method"); 35 out.println(" </BODY>"); 36 out.println("</HTML>"); 37 out.flush(); 38 out.close(); 39 } 40 41 /** 42 * The doPost method of the servlet. <br> 43 * 44 * This method is called when a form has its tag value method equals to post. 45 * 46 * @param request the request send by the client to the server 47 * @param response the response send by the server to the client 48 * @throws ServletException if an error occurred 49 * @throws IOException if an error occurred 50 */ 51 public void doPost(HttpServletRequest request, HttpServletResponse response) 52 throws ServletException, IOException { 53 54 response.setContentType("text/html"); 55 PrintWriter out = response.getWriter(); 56 out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); 57 out.println("<HTML>"); 58 out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); 59 out.println(" <BODY>"); 60 out.print(" This is "); 61 out.print(this.getClass()); 62 out.println(", using the POST method"); 63 out.println(" </BODY>"); 64 out.println("</HTML>"); 65 out.flush(); 66 out.close(); 67 } 68 69 }
在实际开发中，这些生成的代码和注释一般我们都用不到的，每次都要手工删除这些注释和代码，很麻烦，因此可以根据开发的实际情况修改Servlet的模板代码，改成符合实际开发需求的模板代码。下面以MyEclipse 10为例进行说明如何修改Servlet的模板代码
具体步骤如下：找到MyEclipse安装目录下的\Common\plugins文件夹，比如：D:\MyEclipse10\Common\plugins，然后找到com.genuitec.eclipse.wizards_9.0.0.me201108091322.jar这个jar文件，为了方便查找com.genuitec.eclipse.wizards_9.0.0.me201108091322.jar这个jar文件，建议使用【SearchEverything】这样的文件查找工具，如下图所示：
用压缩工具打开，注意是打开不是解压这个jar包，如下图所示：
打开com.genuitec.eclipse.wizards_9.0.0.me201108091322.jar这个jar文件后，可以看到里面有一个templates文件夹，进入templates文件夹，可以看到里面有一个Servlet.java文件，如下图所示：
打开Servlet.java文件，可以看到里面的模板代码：
1 #---------------------------------------------# 2 # <aw:description>Template for Servlet</aw:description> 3 # <aw:version>1.1</aw:version> 4 # <aw:date>04/05/2003</aw:date> 5 # <aw:author>Ferret Renaud</aw:author> 6 #---------------------------------------------# 7 8 <aw:import>java.io.IOException</aw:import> 9 <aw:import>java.io.PrintWriter</aw:import> 10 11 <aw:import>javax.servlet.ServletException</aw:import> 12 <aw:import>javax.servlet.http.HttpServlet</aw:import> 13 <aw:import>javax.servlet.http.HttpServletRequest</aw:import> 14 <aw:import>javax.servlet.http.HttpServletResponse</aw:import> 15 16 <aw:parentClass>javax.servlet.http.HttpServlet</aw:parentClass> 17 18 <aw:constructor name="c1"> 19 /** 20 * Constructor of the object. 21 */ 22 public <aw:className/>() { 23 super(); 24 } 25 26 </aw:constructor> 27 28 <aw:method name="doGet"> 29 /** 30 * The doGet method of the servlet. <br> 31 * 32 * This method is called when a form has its tag value method equals to get. 33 * 34 * @param request the request send by the client to the server 35 * @param response the response send by the server to the client 36 * @throws ServletException if an error occurred 37 * @throws IOException if an error occurred 38 */ 39 public void doGet(HttpServletRequest request, HttpServletResponse response) 40 throws ServletException, IOException { 41 42 response.setContentType("text/html"); 43 PrintWriter out = response.getWriter(); 44 out.println( 45 "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); 46 out.println("<HTML>"); 47 out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); 48 out.println(" <BODY>"); 49 out.print(" This is "); 50 out.print(this.getClass()); 51 out.println(", using the GET method"); 52 out.println(" </BODY>"); 53 out.println("</HTML>"); 54 out.flush(); 55 out.close(); 56 } 57 58 </aw:method> 59 60 <aw:method name="doPost"> 61 /** 62 * The doPost method of the servlet. <br> 63 * 64 * This method is called when a form has its tag value method equals to post. 65 * 66 * @param request the request send by the client to the server 67 * @param response the response send by the server to the client 68 * @throws ServletException if an error occurred 69 * @throws IOException if an error occurred 70 */ 71 public void doPost(HttpServletRequest request, HttpServletResponse response) 72 throws ServletException, IOException { 73 74 response.setContentType("text/html"); 75 PrintWriter out = response.getWriter(); 76 out.println( 77 "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); 78 out.println("<HTML>"); 79 out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); 80 out.println(" <BODY>"); 81 out.print(" This is "); 82 out.print(this.getClass()); 83 out.println(", using the POST method"); 84 out.println(" </BODY>"); 85 out.println("</HTML>"); 86 out.flush(); 87 out.close(); 88 } 89 90 </aw:method> 91 92 <aw:method name="doPut"> 93 /** 94 * The doPut method of the servlet. <br> 95 * 96 * This method is called when a HTTP put request is received. 97 * 98 * @param request the request send by the client to the server 99 * @param response the response send by the server to the client 100 * @throws ServletException if an error occurred 101 * @throws IOException if an error occurred 102 */ 103 public void doPut(HttpServletRequest request, HttpServletResponse response) 104 throws ServletException, IOException { 105 106 // Put your code here 107 } 108 109 </aw:method> 110 111 <aw:method name="doDelete"> 112 /** 113 * The doDelete method of the servlet. <br> 114 * 115 * This method is called when a HTTP delete request is received. 116 * 117 * @param request the request send by the client to the server 118 * @param response the response send by the server to the client 119 * @throws ServletException if an error occurred 120 * @throws IOException if an error occurred 121 */ 122 public void doDelete(HttpServletRequest request, HttpServletResponse response) 123 throws ServletException, IOException { 124 125 // Put your code here 126 } 127 128 </aw:method> 129 130 <aw:method name="init"> 131 /** 132 * Initialization of the servlet. <br> 133 * 134 * @throws ServletException if an error occurs 135 */ 136 public void init() throws ServletException { 137 // Put your code here 138 } 139 140 </aw:method> 141 142 <aw:method name="destroy"> 143 /** 144 * Destruction of the servlet. <br> 145 */ 146 public void destroy() { 147 super.destroy(); // Just puts "destroy" string in log 148 // Put your code here 149 } 150 151 </aw:method> 152 153 <aw:method name="getServletInfo"> 154 /** 155 * Returns information about the servlet, such as 156 * author, version, and copyright. 157 * 158 * @return String information about this servlet 159 */ 160 public String getServletInfo() { 161 return "This is my default servlet created by Eclipse"; 162 } 163 164 </aw:method>
修改该模板，根据自己的实际情况进行修改，比如
删除doGet和doPost里面的代码和方法注释，在doPost方法里面调用doGet，这是根据实际情况修改成的模板代码，修改好之后，保存，重启MyEclipse，使用MyEclipse创建Servlet，此时就是用刚才修改过的模板进行生成了，生成的代码如下：
1 package gacl.servlet.study; 2 3 import java.io.IOException; 4 5 import javax.servlet.ServletException; 6 import javax.servlet.http.HttpServlet; 7 import javax.servlet.http.HttpServletRequest; 8 import javax.servlet.http.HttpServletResponse; 9 10 public class ServletNewTemplateCode extends HttpServlet { 11 12 public void doGet(HttpServletRequest request, HttpServletResponse response) 13 throws ServletException, IOException { 14 15 } 16 17 public void doPost(HttpServletRequest request, HttpServletResponse response) 18 throws ServletException, IOException { 19 doGet(request, response); 20 } 21 22 }
二、修改jsp的默认模板
同样也是找到com.genuitec.eclipse.wizards_9.0.0.me201108091322.jar这个jar文件，用压缩工具打开，进入templates\jsp文件夹，可以看到MyEclipse自带的那些jsp模板，如下图所示：
这些jsp模板是MyEclipse自带的，我们也可以依样画葫芦，根据平时项目开发中的实际情况，创建一个jsp模板，然后添加到jsp目录中，操作步骤如下：
1、随便复制一个jsp模板出来(如：Jsp.vtl)，复制到系统的桌面或者系统的其他盘进行存储
2、修改复制出来的模板，使用记事本或者editplus打开Jsp.vtl，可以看到Jsp.vtl的模板代码，如下所示：
1 #*---------------------------------------------# 2 # Template for a JSP 3 # @version: 1.2 4 # @author: Ferret Renaud 5 # @author: Jed Anderson 6 #---------------------------------------------# 7 *#<%@ page language="java" import="java.util.*" pageEncoding="$encoding"%> 8 <% 9 String path = request.getContextPath(); 10 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 11 %> 12 13 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 14 <html> 15 <head> 16 <base href="<%=basePath%>"> 17 18 <title>My JSP '$title' starting page</title> 19 20 #parse( "templates/jsp/JSPMetaTags.vtl" ) 21 </head> 22 23 <body> 24 This is my JSP page. <br> 25 </body> 26 </html>
这是Jsp.vtl的模板原始代码，这个模板的代码对于我来说不太符合项目开发中的实际情况，需要修改，修改后的模板如下：
1 #*---------------------------------------------# 2 # Template for a JSP 3 # @version: 1.2 4 # @author: 孤傲苍狼 5 #---------------------------------------------# 6 *#<%@ page language="java" pageEncoding="UTF-8"%> 7 <!DOCTYPE HTML> 8 <html> 9 <head> 10 <title></title> 11 </head> 12 13 <body> 14 15 </body> 16 </html>
为了避免覆盖原来的Jsp.vtl模板，将修改后的Jsp.vtl模板重命名，例如重命名成gacl.vtl。
3.将gacl.vtl模板复制，然后粘贴到com.genuitec.eclipse.wizards_9.0.0.me201108091322.jar包里面的templates\jsp文件夹里。
4、从查看解压文件的界面中，返回到根目录(即com.genuitec.eclipse.wizards_9.0.0.me201108091322.jar目录)，找到模版配置文件templates.xml，如下图所示：
同样，将templates.xml文件复制到桌面，使用记事本或者editplus打开进行修改。
修改如下：在<templateLibrary>里添加如下元素：
1 <template 2 context="com.genuitec.eclipse.wizards.jsp" 3 script="templates/jsp/gacl.vtl" 4 name="gacl-JSP template"/>
其中：
1、templates/jsp/gacl.vtl：为新添加的jsp模板的相对路径。
2、gacl-JSP template：为MyEclipse中所要标识的模版名称，MyEclipse新建JSP文件时通过这个名字来选择对应的模版。
3、context="com.genuitec.eclipse.wizards.jsp" 这个一定要存在，并且跟其他jsp模板的设置一样，复制就可以。
templates.xml修改后的内容如下图所示：
5、修改完成后，将com.genuitec.eclipse.wizards_9.0.0.me201108091322.jar包中的templates.xml文件删除掉，然后将修改过后的templates.xml复制，粘贴到com.genuitec.eclipse.wizards_9.0.0.me201108091322.jar包中，如下图所示：
到此，我们的Jsp模板就算是创建好了。
6.启动MyEclipse，然后新创建一个Jsp页面，此时就可以使用我们自定义的那个Jsp页面模板了，如下图所示：
通过以上两种方式，我们在开发的时候，就可以根据我们自己的开发习惯来定制servlet和jsp的模板了，对于开发效率上或多或少有一点提高吧，不用每次都把MyEclipse生成的很多用不到的代码删掉。
