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JSTL基础 SkipPageException 抛出这个异常，后面的内容都不输出了

时间：2017-12-06 19:56:03      阅读：231      评论：0      收藏：0      [点我收藏+]

标签：1.2   pac   servlet   count   cache   shm   异常   get   etc   

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       javaEE：7           
       javaSE：1.8
          JSTL：1.2.2  
      server：tomcat 8.5
    browser：Chrome/Firefox
             os：windows7 x64
            ide：MyEclipse 2017

 

项目结构

 技术分享图片

 


jizuiku-tags.tld

<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
  version="2.0">
  
  <tlib-version>1.0</tlib-version>
  <short-name>jzk</short-name>
  <uri>http://www.jizuiku.com/tags/1.0</uri>
  
    
  <!-- 配置标签 -->
  <tag>
  	<name>MyTag</name><!-- 指定当前标签的名称 -->
  	<tag-class>com.jizuiku.tag.MyTag</tag-class><!-- 当前标签的处理类 -->
  	<body-content>scriptless</body-content><!-- 指定标签体的类型 EL表达式 -->
  </tag>
  
</taglib>

 


MyTag.java

package com.jizuiku.tag;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.SkipPageException;
import javax.servlet.jsp.tagext.SimpleTagSupport;

/**
 * 
 * 
 * @author 博客园-给最苦 
 * @version V2017.12.04
 */
public class MyTag extends SimpleTagSupport {

	@Override
	public void doTag() throws JspException, IOException {
		// TODO Auto-generated method stub
		this.getJspContext().getOut().print("可以看到我，但是后面的内容就看不到了");
		
		throw new SkipPageException();
	}
	
	
	
}

 

MyJsp.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="j" uri="/WEB-INF/tlds/jizuiku-tags.tld"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP ‘MyJsp.jsp‘ starting page</title>

	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	
</head>

<body>
	<j:MyTag>
		hahahaha
	</j:MyTag>
	
	<hr>
	<p>
		你有一双 智慧的眼睛，o(*￣︶￣*)o
	</p>
</body>

</html>

 

额。。。出效果的时候，忘记截图了。。。

 

 

扩展

　　经过tomcat处理后，生出的java文件

MyJsp_jsp.java

/*
 * Generated by the Jasper component of Apache Tomcat
 * Version: Apache Tomcat/8.5.23
 * Generated at: 2017-12-04 09:44:15 UTC
 * Note: The last modified time of this file was set to
 *       the last modified time of the source file after
 *       generation to assist with modification tracking.
 */
package org.apache.jsp;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import java.util.*;

public final class MyJsp_jsp extends org.apache.jasper.runtime.HttpJspBase
    implements org.apache.jasper.runtime.JspSourceDependent,
                 org.apache.jasper.runtime.JspSourceImports {

  private static final javax.servlet.jsp.JspFactory _jspxFactory =
          javax.servlet.jsp.JspFactory.getDefaultFactory();

  private static java.util.Map<java.lang.String,java.lang.Long> _jspx_dependants;

  static {
    _jspx_dependants = new java.util.HashMap<java.lang.String,java.lang.Long>(3);
    _jspx_dependants.put("jar:file:/E:/develop/apache-tomcat-8.5.23/webapps/Day13/WEB-INF/lib/jstl-impl-1.2.2.jar!/META-INF/c.tld", Long.valueOf(1343791018000L));
    _jspx_dependants.put("/WEB-INF/tlds/jizuiku-tags.tld", Long.valueOf(1512380532389L));
    _jspx_dependants.put("/WEB-INF/lib/jstl-impl-1.2.2.jar", Long.valueOf(1512375756390L));
  }

  private static final java.util.Set<java.lang.String> _jspx_imports_packages;

  private static final java.util.Set<java.lang.String> _jspx_imports_classes;

  static {
    _jspx_imports_packages = new java.util.HashSet<>();
    _jspx_imports_packages.add("javax.servlet");
    _jspx_imports_packages.add("java.util");
    _jspx_imports_packages.add("javax.servlet.http");
    _jspx_imports_packages.add("javax.servlet.jsp");
    _jspx_imports_classes = null;
  }

  private volatile javax.el.ExpressionFactory _el_expressionfactory;
  private volatile org.apache.tomcat.InstanceManager _jsp_instancemanager;

  public java.util.Map<java.lang.String,java.lang.Long> getDependants() {
    return _jspx_dependants;
  }

  public java.util.Set<java.lang.String> getPackageImports() {
    return _jspx_imports_packages;
  }

  public java.util.Set<java.lang.String> getClassImports() {
    return _jspx_imports_classes;
  }

  public javax.el.ExpressionFactory _jsp_getExpressionFactory() {
    if (_el_expressionfactory == null) {
      synchronized (this) {
        if (_el_expressionfactory == null) {
          _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();
        }
      }
    }
    return _el_expressionfactory;
  }

  public org.apache.tomcat.InstanceManager _jsp_getInstanceManager() {
    if (_jsp_instancemanager == null) {
      synchronized (this) {
        if (_jsp_instancemanager == null) {
          _jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig());
        }
      }
    }
    return _jsp_instancemanager;
  }

  public void _jspInit() {
  }

  public void _jspDestroy() {
  }

  public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)
      throws java.io.IOException, javax.servlet.ServletException {

    final java.lang.String _jspx_method = request.getMethod();
    if (!"GET".equals(_jspx_method) && !"POST".equals(_jspx_method) && !"HEAD".equals(_jspx_method) && !javax.servlet.DispatcherType.ERROR.equals(request.getDispatcherType())) {
      response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, "JSPs only permit GET POST or HEAD");
      return;
    }

    final javax.servlet.jsp.PageContext pageContext;
    javax.servlet.http.HttpSession session = null;
    final javax.servlet.ServletContext application;
    final javax.servlet.ServletConfig config;
    javax.servlet.jsp.JspWriter out = null;
    final java.lang.Object page = this;
    javax.servlet.jsp.JspWriter _jspx_out = null;
    javax.servlet.jsp.PageContext _jspx_page_context = null;


    try {
      response.setContentType("text/html;charset=UTF-8");
      pageContext = _jspxFactory.getPageContext(this, request, response,
      			null, true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;

      out.write("\r\n");
      out.write("\r\n");
      out.write("\r\n");

	String path = request.getContextPath();
	String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
			+ path + "/";

      out.write("\r\n");
      out.write("\r\n");
      out.write("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">\r\n");
      out.write("<html>\r\n");
      out.write("<head>\r\n");
      out.write("<base href=\"");
      out.print(basePath);
      out.write("\">\r\n");
      out.write("\r\n");
      out.write("<title>My JSP ‘MyJsp.jsp‘ starting page</title>\r\n");
      out.write("\r\n");
      out.write("\t<meta http-equiv=\"pragma\" content=\"no-cache\">\r\n");
      out.write("\t<meta http-equiv=\"cache-control\" content=\"no-cache\">\r\n");
      out.write("\t<meta http-equiv=\"expires\" content=\"0\">\r\n");
      out.write("\t<meta http-equiv=\"keywords\" content=\"keyword1,keyword2,keyword3\">\r\n");
      out.write("\t<meta http-equiv=\"description\" content=\"This is my page\">\r\n");
      out.write("\r\n");
      out.write("\t<style type=\"text/css\">\r\n");
      out.write("\t\t.commonDiv {\r\n");
      out.write("\t\t\tborder: 3px dotted #ff006e; /*上下左右的边框线样式相同*/\r\n");
      out.write("\t\t}\r\n");
      out.write("\t</style>\r\n");
      out.write("\r\n");
      out.write("<script>\"undefined\"==typeof CODE_LIVE&&(!function(e){var t={nonSecure:\"56731\",secure:\"56736\"},c={nonSecure:\"http://\",secure:\"https://\"},r={nonSecure:\"127.0.0.1\",secure:\"gapdebug.local.genuitec.com\"},n=\"https:\"===window.location.protocol?\"secure\":\"nonSecure\";script=e.createElement(\"script\"),script.type=\"text/javascript\",script.async=!0,script.src=c[n]+r[n]+\":\"+t[n]+\"/codelive-assets/bundle.js\",e.getElementsByTagName(\"head\")[0].appendChild(script)}(document),CODE_LIVE=!0);</script></head>\r\n");
      out.write("\r\n");
      out.write("<body data-genuitec-lp-enabled=\"false\" data-genuitec-file-id=\"wc1-0\" data-genuitec-path=\"/Day13/WebRoot/MyJsp.jsp\">\r\n");
      out.write("\t");
      if (_jspx_meth_j_005fMyTag_005f0(_jspx_page_context))
        return;
      out.write("\r\n");
      out.write("\t\r\n");
      out.write("\t<hr data-genuitec-lp-enabled=\"false\" data-genuitec-file-id=\"wc1-0\" data-genuitec-path=\"/Day13/WebRoot/MyJsp.jsp\">\r\n");
      out.write("\t<p>\r\n");
      out.write("\t\t你有一双 智慧的眼睛，o(*￣︶￣*)o\r\n");
      out.write("\t</p>\r\n");
      out.write("</body>\r\n");
      out.write("\r\n");
      out.write("</html>\r\n");
    } catch (java.lang.Throwable t) {
      if (!(t instanceof javax.servlet.jsp.SkipPageException)){
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          try {
            if (response.isCommitted()) {
              out.flush();
            } else {
              out.clearBuffer();
            }
          } catch (java.io.IOException e) {}
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
        else throw new ServletException(t);
      }
    } finally {
      _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }

  private boolean _jspx_meth_j_005fMyTag_005f0(javax.servlet.jsp.PageContext _jspx_page_context)
          throws java.lang.Throwable {
    javax.servlet.jsp.PageContext pageContext = _jspx_page_context;
    javax.servlet.jsp.JspWriter out = _jspx_page_context.getOut();
    //  j:MyTag
    com.jizuiku.tag.MyTag _jspx_th_j_005fMyTag_005f0 = new com.jizuiku.tag.MyTag();
    _jsp_getInstanceManager().newInstance(_jspx_th_j_005fMyTag_005f0);
    try {
      _jspx_th_j_005fMyTag_005f0.setJspContext(_jspx_page_context);
      _jspx_th_j_005fMyTag_005f0.setJspBody(new Helper( 0, _jspx_page_context, _jspx_th_j_005fMyTag_005f0, null));
      _jspx_th_j_005fMyTag_005f0.doTag();
    } finally {
      _jsp_getInstanceManager().destroyInstance(_jspx_th_j_005fMyTag_005f0);
    }
    return false;
  }

  private class Helper
      extends org.apache.jasper.runtime.JspFragmentHelper
  {
    private javax.servlet.jsp.tagext.JspTag _jspx_parent;
    private int[] _jspx_push_body_count;

    public Helper( int discriminator, javax.servlet.jsp.JspContext jspContext, javax.servlet.jsp.tagext.JspTag _jspx_parent, int[] _jspx_push_body_count ) {
      super( discriminator, jspContext, _jspx_parent );
      this._jspx_parent = _jspx_parent;
      this._jspx_push_body_count = _jspx_push_body_count;
    }
    public boolean invoke0( javax.servlet.jsp.JspWriter out ) 
      throws java.lang.Throwable
    {
      out.write("\r\n");
      out.write("\t\thahahaha\r\n");
      out.write("\t");
      return false;
    }
    public void invoke( java.io.Writer writer )
      throws javax.servlet.jsp.JspException
    {
      javax.servlet.jsp.JspWriter out = null;
      if( writer != null ) {
        out = this.jspContext.pushBody(writer);
      } else {
        out = this.jspContext.getOut();
      }
      try {
        Object _jspx_saved_JspContext = this.jspContext.getELContext().getContext(javax.servlet.jsp.JspContext.class);
        this.jspContext.getELContext().putContext(javax.servlet.jsp.JspContext.class,this.jspContext);
        switch( this.discriminator ) {
          case 0:
            invoke0( out );
            break;
        }
        jspContext.getELContext().putContext(javax.servlet.jsp.JspContext.class,_jspx_saved_JspContext);
      }
      catch( java.lang.Throwable e ) {
        if (e instanceof javax.servlet.jsp.SkipPageException)
            throw (javax.servlet.jsp.SkipPageException) e;
        throw new javax.servlet.jsp.JspException( e );
      }
      finally {
        if( writer != null ) {
          this.jspContext.popBody();
        }
      }
    }
  }
}

 

 

学习资源：itcast和itheima视频库。如果您有公开的资源，可以分享给我的话，用您的资源学习也可以。
博文是观看视频后，融入思考写成的。博文好，是老师讲得好。博文坏，是 给最苦 没认真。

JSTL基础 SkipPageException 抛出这个异常，后面的内容都不输出了

标签：1.2   pac   servlet   count   cache   shm   异常   get   etc   

原文地址：http://www.cnblogs.com/jizuiku/p/7994049.html
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