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摘要: 本文通过开发一个JSP 编辑器插件的示例,介绍了 Eclipse 中设置 JSP 断点的方法,以及如何远程调试 JSP。
-Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n -Xrunjdwp JVM 加载 jdwp.dll transport=dt_socket 使用 Socket 传输 address 表示调试端口号 server=y 表示 JVM 作为服务器,建立 Socket suspend=n 表示启动过程中,JVM 不会挂起去等待调试客户端连接</td></tr></table>
Components Debugger Interface / |-----------------------| / | VM | debuggee ----( |-----------------------| <------- JVMDI - Java VM Debug Interface \ | back-end | \ |-----------------------| / | comm channel -( | <--------------- JDWP - Java Debug Wire Protocol \ | |---------------------| | front-end | |---------------------| <------- JDI - Java Debug Interface | UI | |---------------------|</td></tr></table>
com.sun.jdi com.sun.jdi.connect com.sun.jdi.event com.sun.jdi.request本文不对 JDI 进行深入阐述,这里重点介绍 JDI 中与断点相关的接口。
1 2 <head> 3</td></tr></table>Hello Example 4 </head> 5 <body> 6 <%@ include file="greeting.jsp" %> 7 </body> 8
2 Goodbye on <%= new java.util.Date() %>
JSP 编译后产生的Hello_jsp.java 如下:
<table borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
Hello_jsp.java: 1 package org.apache.jsp; 2 3 import javax.servlet.*; 4 import javax.servlet.http.*; 5 import javax.servlet.jsp.*; 6 7 public final class Hello_jsp extends org.apache.jasper.runtime.HttpJspBase 8 implements org.apache.jasper.runtime.JspSourceDependent { 9 10 private static java.util.Vector _jspx_dependants; 11 12 static { 13 _jspx_dependants = new java.util.Vector(1); 14 _jspx_dependants.add("/greeting.jsp"); 15 } 16 17 public java.util.List getDependants() { 18 return _jspx_dependants; 19 } 20 21 public void _jspService(HttpServletRequest request, HttpServletResponse response) 22 throws java.io.IOException, ServletException { 23 24 JspFactory _jspxFactory = null; 25 PageContext pageContext = null; 26 HttpSession session = null; 27 ServletContext application = null; 28 ServletConfig config = null; 29 JspWriter out = null; 30 Object page = this; 31 JspWriter _jspx_out = null; 32 33 34 try { 35 _jspxFactory = JspFactory.getDefaultFactory(); 36 response.setContentType("text/html"); 37 pageContext = _jspxFactory.getPageContext(this, request, response, 38 null, true, 8192, true); 39 application = pageContext.getServletContext(); 40 config = pageContext.getServletConfig(); 41 session = pageContext.getSession(); 42 out = pageContext.getOut(); 43 _jspx_out = out; 44 45 out.write(" \r\n"); 46 out.write("<head> \r\n"); 47 out.write("</td></tr></table>Hello Example"); 48 out.write(" \r\n"); 49 out.write("</head> \r\n"); 50 out.write("<body> \r\n"); 51 out.write("Hello There!"); 52 out.write("\r\nGoodbye on "); 53 out.write(String.valueOf( new java.util.Date() )); 54 out.write(" \r\n"); 55 out.write(" \r\n"); 56 out.write("</body> \r\n"); 57 out.write(" \r\n"); 58 } catch (Throwable t) { 59 if (!(t instanceof javax.servlet.jsp.SkipPageException)){ 60 out = _jspx_out; 61 if (out != null && out.getBufferSize() != 0) 62 out.clearBuffer(); 63 if (pageContext != null) pageContext.handlePageException(t); 64 } 65 } finally { 66 if (_jspxFactory != null) _jspxFactory.releasePageContext ( pageContext); 67 } 68 } 69 }
SourceDebugExtension_attribute { u2 attribute_name_index; u4 attribute_length; u1 debug_extension[attribute_length]; }</td></tr></table>
public static void main(String[] args) throws Exception{ String[]files = { "E:\\Tomcat5_0_5\\work\\Catalina\\localhost\\_\\org\\apache\\jsp\\Hello_jsp.class", }; for(int k = 0; k < files.length; k++){ String file = files[k]; System.out.println("Class : " + file); ClassFile classFile = new ClassFile(new DataInputStream(new FileInputStream(file))); AttributeInfo attributeInfo = classFile.getAttribute("SourceDebugExtension"); System.out.println("attribute name :" + attributeInfo.getName() + "]\n\n"); byte[]bytes = attributeInfo.get(); String str = new String(bytes); System.out.println(str); } }</td></tr></table>
SMAP E:\Tomcat5_0_5\work\Catalina\localhost\_\org\apache\jsp\Hello_jsp.java JSP *S JSP *F + 0 Hello.jsp /Hello.jsp + 1 greeting.jsp /greeting.jsp *L 1:45 2:46 3:47 3:48 4:49 5:50 1#1:51 1:52 2:53 7#0:56 8:57 *E</td></tr></table>
1:45 2:46 3:47 3:48 4:49 5:50(没有源文件代号,默认为Hello.jsp) 开始行号 结束行号 Hello.jsp: 1 -> Hello_jsp.java: 45 2 -> 46 3 -> 47 48 4 -> 49 5 -> 50 1#1:51 1:52 2:53(1#1表示 greeting.jsp 的第1行) greeting.jsp: 1 -> Hello_jsp.java: 51 52 2 -> 53 7#0:56 8:57(7#0表示 Hello.jsp 的第7行) Hello.jsp: 7 -> Hello_jsp.java: 56 8 -> 57</td></tr></table>