Tomcat 6 --- 使用Jasper引擎解析JSP

  <!-- The JSP page compiler and execution servlet, which is the mechanism  -->
  <!-- used by Tomcat to support JSP pages.  Traditionally, this servlet    -->
  <!-- is mapped to the URL pattern "*.jsp".  This servlet supports the     -->
  <!-- following initialization parameters (default values are in square    -->
  <!-- brackets):                                                           -->
  <!--                                                                      -->
  <!--   checkInterval       If development is false and checkInterval is   -->
  <!--                       greater than zero, background compilations are -->
  <!--                       enabled. checkInterval is the time in seconds  -->
  <!--                       between checks to see if a JSP page (and its   -->
  <!--                       dependent files) needs to  be recompiled. [0]  -->
  <!--                                                                      -->
  <!--   classdebuginfo      Should the class file be compiled with         -->
  <!--                       debugging information?  [true]                 -->
  <!--                                                                      -->
  <!--   classpath           What class path should I use while compiling   -->
  <!--                       generated servlets?  [Created dynamically      -->
  <!--                       based on the current web application]          -->
  <!--                                                                      -->
  <!--   compiler            Which compiler Ant should use to compile JSP   -->
  <!--                       pages.  See the jasper documentation for more  -->
  <!--                       information.                                   -->
  <!--                                                                      -->
  <!--   compilerSourceVM    Compiler source VM. [1.5]                      -->
  <!--                                                                      -->
  <!--   compilerTargetVM    Compiler target VM. [1.5]                      -->  
  <!--                                                                      -->
  <!--   development         Is Jasper used in development mode? If true,   -->
  <!--                       the frequency at which JSPs are checked for    -->
  <!--                       modification may be specified via the          -->
  <!--                       modificationTestInterval parameter. [true]     -->
  <!--                                                                      -->
  <!--   displaySourceFragment                                              -->
  <!--                       Should a source fragment be included in        -->
  <!--                       exception messages? [true]                     -->
  <!--                                                                      -->
  <!--   dumpSmap            Should the SMAP info for JSR45 debugging be    -->
  <!--                       dumped to a file? [false]                      -->
  <!--                       False if suppressSmap is true                  -->
  <!--                                                                      -->
  <!--   enablePooling       Determines whether tag handler pooling is      -->
  <!--                       enabled. This is a compilation option. It will -->
  <!--                       not alter the behaviour of JSPs that have      -->
  <!--                       already been compiled. [true]                  -->
  <!--                                                                      -->
  <!--   engineOptionsClass  Allows specifying the Options class used to    -->
  <!--                       configure Jasper. If not present, the default  -->
  <!--                       EmbeddedServletOptions will be used.           -->
  <!--                                                                      -->
  <!--   errorOnUseBeanInvalidClassAttribute                                -->
  <!--                       Should Jasper issue an error when the value of -->
  <!--                       the class attribute in an useBean action is    -->
  <!--                       not a valid bean class?  [true]                -->
  <!--                                                                      -->
  <!--   fork                Tell Ant to fork compiles of JSP pages so that -->
  <!--                       a separate JVM is used for JSP page compiles   -->
  <!--                       from the one Tomcat is running in. [true]      -->
  <!--                                                                      -->
  <!--   genStringAsCharArray                                               -->
  <!--                       Should text strings be generated as char       -->
  <!--                       arrays, to improve performance in some cases?  -->
  <!--                       [false]                                        -->
  <!--                                                                      -->
  <!--   ieClassId           The class-id value to be sent to Internet      -->
  <!--                       Explorer when using <jsp:plugin> tags.         -->
  <!--                       [clsid:8AD9C840-044E-11D1-B3E9-00805F499D93]   -->
  <!--                                                                      -->
  <!--   javaEncoding        Java file encoding to use for generating java  -->
  <!--                       source files. [UTF8]                           -->
  <!--                                                                      -->
  <!--   keepgenerated       Should we keep the generated Java source code  -->
  <!--                       for each page instead of deleting it? [true]   -->
  <!--                                                                      -->
  <!--   mappedfile          Should we generate static content with one     -->
  <!--                       print statement per input line, to ease        -->
  <!--                       debugging?  [true]                             -->
  <!--                                                                      -->
  <!--   modificationTestInterval                                           -->
  <!--                       Causes a JSP (and its dependent files) to not  -->
  <!--                       be checked for modification during the         -->
  <!--                       specified time interval (in seconds) from the  -->
  <!--                       last time the JSP was checked for              -->
  <!--                       modification. A value of 0 will cause the JSP  -->
  <!--                       to be checked on every access.                 -->
  <!--                       Used in development mode only. [4]             -->
  <!--                                                                      -->
  <!--   recompileOnFail     If a JSP compilation fails should the          -->
  <!--                       modificationTestInterval be ignored and the    -->
  <!--                       next access trigger a re-compilation attempt?  -->
  <!--                       Used in development mode only and is disabled  -->
  <!--                       by default as compilation may be expensive and -->
  <!--                       could lead to excessive resource usage.        -->
  <!--                       [false]                                        -->
  <!--                                                                      -->
  <!--   scratchdir          What scratch directory should we use when      -->
  <!--                       compiling JSP pages?  [default work directory  -->
  <!--                       for the current web application]               -->
  <!--                                                                      -->
  <!--   suppressSmap        Should the generation of SMAP info for JSR45   -->
  <!--                       debugging be suppressed?  [false]              -->
  <!--                                                                      -->
  <!--   trimSpaces          Should white spaces in template text between   -->
  <!--                       actions or directives be trimmed?  [false]     -->
  <!--                                                                      -->
  <!--   xpoweredBy          Determines whether X-Powered-By response       -->
  <!--                       header is added by generated servlet  [false]  -->
  <!--                                                                      -->
  <!-- If you wish to use Jikes to compile JSP pages:                       -->
  <!--   Please see the "Using Jikes" section of the Jasper-HowTo           -->
  <!--   page in the Tomcat documentation.                                  -->

    <servlet>
        <servlet-name>jsp</servlet-name>
        <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
        <init-param>
            <param-name>fork</param-name>
            <param-value>false</param-value>
        </init-param>
        <init-param>
            <param-name>xpoweredBy</param-name>
            <param-value>false</param-value>
        </init-param>
        <load-on-startup>3</load-on-startup>
    </servlet>

package com.test;
import org.apache.jasper.JspC;

public class testCompiler{
    public String jspcTest(){  
        String error="";  
        try {  
            JspC jspc = new JspC();  
            //第一种方式
            String[] arg0 = {"-uriroot", "F:/apache-tomcat-6.0.43/webapps/ROOT", "-d", "F:/test", 
                    "index.jsp" }; 
            jspc.setArgs(arg0); 
            
            //第二种方式
            /*jspc.setUriroot("F:/apache-tomcat-6.0.43/webapps/ROOT");//web应用的root目录  
            jspc.setOutputDir("F:/test");//.java文件和.class文件的输出目录  
            jspc.setJspFiles("index.jsp");//要编译的jsp  */
            
            jspc.setCompile(true);//是否编译 false或不指定的话只生成.java文件  
            jspc.execute(); 
        }catch(Exception e){
            error=e.toString();
        }
        return error;  
    }
    public static void main(String args[]){  
        testCompiler t=new testCompiler();  
        System.out.println(t.jspcTest());  
    }  
}