Eclipse使用总结——修改(My)Eclipse默认的Servlet和jsp代码模板

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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 server19      * @param response the response send by the server to the client20      * @throws ServletException if an error occurred21      * @throws IOException if an error occurred22      */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 server47      * @param response the response send by the server to the client48      * @throws ServletException if an error occurred49      * @throws IOException if an error occurred50      */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 client100      * @throws ServletException if an error occurred101      * @throws IOException if an error occurred102      */103     public void doPut(HttpServletRequest request, HttpServletResponse response)104         throws ServletException, IOException {105 106         // Put your code here107     }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 server118      * @param response the response send by the server to the client119      * @throws ServletException if an error occurred120      * @throws IOException if an error occurred121      */122     public void doDelete(HttpServletRequest request, HttpServletResponse response)123         throws ServletException, IOException {124 125         // Put your code here126     }127 128 </aw:method>129 130 <aw:method name="init">131     /**132      * Initialization of the servlet. <br>133      *134      * @throws ServletException if an error occurs135      */136     public void init() throws ServletException {137         // Put your code here138     }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 log148         // Put your code here149     }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 servlet159      */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 <template2         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。

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