自定义标签库读取文件
jsp
<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%@tagliburi="http://www.cgmcc.com/jsp/readfile"prefix="my3"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<basehref="<%=basePath%>">
<title>MyJSP'tagreadfile.jsp'startingpage</title>
<metahttp-equiv="pragma"content="no-cache">
<metahttp-equiv="cache-control"content="no-cache">
<metahttp-equiv="expires"content="0">
<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">
<metahttp-equiv="description"content="Thisismypage">
<!--
<linkrel="stylesheet"type="text/css"href="styles.css">
-->
</head>
<body>
<my3:readFilefile="/WEB-INF/tld/readfile.tld"/>
</body>
</html>
java
packagecom.cgm.readFile;
importjava.io.IOException;
importjava.io.InputStream;
importjava.util.Scanner;
importjavax.servlet.jsp.JspContext;
importjavax.servlet.jsp.JspException;
importjavax.servlet.jsp.PageContext;
importjavax.servlet.jsp.tagext.JspFragment;
importjavax.servlet.jsp.tagext.JspTag;
importjavax.servlet.jsp.tagext.SimpleTag;
publicclassTagReadFileimplementsSimpleTag{
privateStringfile;
privatePageContextpageContext;
publicStringgetFile(){
returnfile;
}
publicvoidsetFile(Stringfile){
this.file=file;
}
publicvoiddoTag()throwsJspException,IOException{//可以动态生成jsp啊..
//处理逻辑
//开始读文件.
System.out.println("-----------------"+file);
InputStreamin=pageContext.getServletContext().getResourceAsStream(file);
Scannerscanner=newScanner(in,"UTF-8");
while(scanner.hasNext()){
Stringline=scanner.nextLine();
line=line.replace("<","<");
line=line.replace(">",">");
pageContext.getOut().print(line);
pageContext.getOut().println("</br>");//换行
}
}
publicJspTaggetParent(){
//TODOAuto-generatedmethodstub
returnnull;
}
publicvoidsetJspBody(JspFragmentjspBody){
}
publicvoidsetJspContext(JspContextpc){
this.pageContext=(PageContext)pc;
}
publicvoidsetParent(JspTagparent){
}
}
tld
<?xmlversion="1.0"encoding="UTF-8"?>
<taglibxmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2eehttp://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
version="2.0">
<tlib-version>1.3</tlib-version>
<short-name>my3</short-name>
<uri>http://www.cgmcc.com/jsp/readfile</uri>
<tag>
<name>readFile</name>
<tag-class>com.cgm.readFile.TagReadFile</tag-class>
<body-content>empty</body-content>
<attribute>
<name>file</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
<type>java.lang.String</type>
</attribute>
</tag>
</taglib>