JSP page instruction: page instruction
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Java
<%@page [language="java"] [contentType="mimeType;charset=CHARSET"] [import="{package.class|pageage.*},……"] [extends="package.class"] [session="true|false"] [buffer="none|8kb|size kb] [autoFlush="true|false"] [isThreadSafe="true|false"] [info="text"] [errorPage="relativeURL"] [isErrorPage="true|false"] [isELIgnored="true|false"] [pageEncoding=" CHARSET"] %>
Example 1
<%@page autoFlush="true"%>
Note: if the buffer attribute is set to none, autoflush cannot be set to false.
Example 2
<%@page buffer="8kb"%>
Example 3
<%@page contentType="text/html"%>
Example 4
<%@page contentType="text/html;charset=gb2312"%>
Example 5
<%@page errorPage="error.jsp"%>
Example 6
<%@page extends="java.util.Date"%>
Example 7
<%@page import="java.util.*"%> <%@page import="java.text.*"%>
<%@page import="java.util.*,java.text.*"%>
java.lang.* javax.servlet.* javax.servlet.jsp.* javax.servlet.http.*
Example 8
<%@page info="This is index.jsp!"%> <%=this.getServletInfo()%>
Example 9
<%@page contentType="text/html;charset=gb2312"errorPage="error.jsp"%> <% String name="lzw"; Integer.parseInt(name); //将字符串转化为整型 %>
<%@page contentType="text/html;charset=gb2312"isErrorPage="true"%>
<%=exception.getMessage()%>
Example 10
<%@page isELIgnored="false"%>
Example 11
<%@page isThreadSafe="true"%>
Example 12
<%@page language="java"%>
Example 13
<%@page pageEncoding="ISO-8859-1"%>
Example 14
<%@page session="true"%>
<%@page language="java"import="java.util.*"pageEncoding="gb2312"%> <%@page contentType="image/jpeg"%> <%@page import="java.awt.*"%> <%@page import="java.io.*"%> <%@page import="java.awt.image.*"%> <%@page import="java.awt.geom.*"%> <%@page import="com.sun.image.codec.jpeg.*"%> <%int width=200,height=200; //描述具有可访问图像数据缓冲区的Image BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics g=image.getGraphics(); g.setColor(Color.white); g.fillRect(0,width,height); Graphics2D g_2d=(Graphics2D)g; //以double精度定义椭圆 Ellipse2D ellipse=new Ellipse2D.Double(40,80,100,40); g_2d.setColor(Color.blue); //执行从2D坐标到其他2D坐标的线性映射 AffineTransform trans=new AffineTransform(); for(int i=1;i<=12;i++){ trans.rotate(30.0*Math.PI/180,90,100); g_2d.setTransform(trans); g_2d.draw(ellipse); } g.dispose(); //获取指向客户端的输出流 OutputStream outClient=response.getOutputStream(); JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(outClient); encoder.encode(image); %>
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