JSP Tag实现定义 java文件

发布时间:2017-6-25 1:21:19 编辑:www.fx114.net 分享查询网我要评论
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/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package examples; import java.io.IOException; import java.io.InputStream; import java.util.Locale; import javax.servlet.jsp.JspException; import javax.servlet.jsp.JspTagException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.tagext.TagSupport; /** * Display the sources of the JSP file. */ public class ShowSource extends TagSupport { private static final long serialVersionUID = 1L; String jspFile; public void setJspFile(String jspFile) { this.jspFile = jspFile; } @Override public int doEndTag() throws JspException { if ((jspFile.indexOf( ".." ) >= 0) || (jspFile.toUpperCase(Locale.ENGLISH).indexOf("/WEB-INF/") != 0) || (jspFile.toUpperCase(Locale.ENGLISH).indexOf("/META-INF/") != 0)) throw new JspTagException("Invalid JSP file " + jspFile); InputStream in = pageContext.getServletContext().getResourceAsStream(jspFile); if (in == null) throw new JspTagException("Unable to find JSP file: "+jspFile); JspWriter out = pageContext.getOut(); try { out.println("<body>"); out.println("<pre>"); for(int ch = in.read(); ch != -1; ch = in.read()) if (ch == '<') out.print("<"); else out.print((char) ch); out.println("</pre>"); out.println("</body>"); } catch (IOException ex) { throw new JspTagException("IOException: "+ex.toString()); } return super.doEndTag(); } }

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