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//JavaÎļþÏÂÔØµÄ¼¸ÖÖ·½Ê½  
 
    public HttpServletResponse download(String path, HttpServletResponse response) {  
        try {  
            // pathÊÇÖ¸ÓûÏÂÔØµÄÎļþµÄ·¾¶¡£  
            File file = new File(path);  
            // È¡µÃÎļþÃû¡£  
            String filename = file.getName();  
            // È¡µÃÎļþµÄºó׺Ãû¡£  
            String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();  
 
            // ÒÔÁ÷µÄÐÎʽÏÂÔØÎļþ¡£  
            InputStream fis = new BufferedInputStream(new FileInputStream(path));  
            byte[] buffer = new byte[fis.available()];  
            fis.read(buffer);  
            fis.close();  
            // Çå¿Õresponse  
            response.reset();  
            // ÉèÖÃresponseµÄHeader  
            response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));  
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java´òÓ¡µÄÔ´´úÂë(ʾÀý)

package com.demo;
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.print.*;
import java.util.*;
import javax.print.*;
import javax.print.attribute.*;
import javax.swing.*;
/**
This program demonstrates how to print 2D graphics ......

javaÉè¼ÆÄ£Ê½

1.factoryÒòΪ¹¤³§Ä£Ê½¾ÍÏ൱ÓÚ´´½¨ÊµÀý¶ÔÏóµÄnew£¬ÎÒÃǾ­³£Òª¸ù¾ÝÀàClassÉú³ÉʵÀý¶ÔÏó£¬
ÈçA a=new A() ¹¤³§Ä£Ê½Ò²ÊÇÓÃÀ´´´½¨ÊµÀý¶ÔÏóµÄ£¬ËùÒÔÒÔºónewʱ¾ÍÒª¶à¸öÐÄÑÛ£¬ÊÇ·ñ¿ÉÒÔ¿¼ÂÇʵÓù¤³§Ä£Ê½£¬
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2.PrototypeģʽÔÊÐíÒ»¸ö¶ÔÏóÔÙ´´½¨Á ......

µÚÎåÕ ³õʼ»¯(think in java ±Ê¼Ç)

ÀàµÄÊý¾Ý³ÉÔ±ÔÚδ±»³õʼ»¯Ê±»á±£Ö¤±»¸³ÓèĬÈÏÖµ
boolean false
char []
byte 0
short 0
int 0
long 0
float 0.0
double 0.0
reference null
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   µ«ÕâÑùÓиöÏÞÖÆ¾ÍÊÇÀàµÄ¶ÔÏó ......

JavaÊý¾Ýµ¼³öµ½excel

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Èç´Óºǫ́¹ýÀ´Êý¾ÝÏÔʾµ½  showUser.jsp
È»ºó¼ÓÁ´½Óµ½ showExcel.jsp¾Í¿ÉÒÔÁË£¬ÔÚÕâ¸öÒ³ÃæÖ»¶àÁ˼¸ÐÐ×Ö£¬ÆäËûµÄ¶¼²»»áÏÔʾ°üÀ¨Ò³Ã棡µ«Õâ¸öÒ³ÃæÉϵÄÊý¾Ý¸úshowUser.js ......
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