showsource.java

来自「一个真实的网络选课系统,由实际需求得到的,本人实际开发出来,运用JSP+TOMC」· Java 代码 · 共 73 行

JAVA
73 行
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/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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 javax.servlet.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

import java.io.*;

/**
 * Display the sources of the JSP file.
 */
public class ShowSource
    extends TagSupport
{
    String jspFile;
    
    public void setJspFile(String jspFile) {
        this.jspFile = jspFile;
    }

    public int doEndTag() throws JspException {
	if ((jspFile.indexOf( ".." ) >= 0) ||
            (jspFile.toUpperCase().indexOf("/WEB-INF/") != 0) ||
            (jspFile.toUpperCase().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);

        InputStreamReader reader = new InputStreamReader(in);
	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("&lt;");
                else
                    out.print((char) ch);
            out.println("</pre>");
            out.println("</body>");
        } catch (IOException ex) {
            throw new JspTagException("IOException: "+ex.toString());
        }
        return super.doEndTag();
    }
}

showsource.java - 源码说明

本页面展示了「一个真实的网络选课系统,由实际需求得到的,本人实际开发出来,运用JSP+TOMCAT」中的 showsource.java 源码文件，采用 Java 编程语言编写，共 73 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。

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