个完整的上传bean

最新推荐文章于 2025-01-22 10:24:59 发布

原创最新推荐文章于 2025-01-22 10:24:59 发布 · 193 阅读

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CC 4.0 BY-SA版权

文章标签：

#bean #string #import #google #file #byte

本文介绍了一个用于处理多文件上传的Java类，该类能够解析HTTP请求中的文件信息，并将特定类型的文件（如图片）保存到指定目录。文章详细展示了如何验证文件类型、限制文件大小及实现文件转移的过程。

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//Title: Cnjsp"s Project 

//Version: 

//Copyright: Copyright (c) 1999 

//Author: Popeye 

//Company: Cnjsp 

//Description: It is for cnjsp 



package popeyelin; 

import java.io.*; 

import javax.servlet.ServletInputStream; 

import javax.servlet.http.HttpServletRequest; 



public class transfer_multi { 

public String[] sourcefile = new String[255];//源文件名 

public String objectpath = "c:/";//目标文件目录 

public String[] suffix = new String[255];//文件后缀名 

public String[] objectfilename = new String[255];//目标文件名 

public ServletInputStream sis = null;//输入流 

public String[] description = new String[255];//描述状态 

public long size = 100*1024;//限制大小 

private int count = 0;//已传输文件数目 

private byte[] b = new byte[4096];//字节流存放数组 

private boolean successful = true; 



public void setSourcefile(HttpServletRequest request) throws java.io.IOException{ 

sis = request.getInputStream(); 

int a = 0; 

int k = 0; 

String s = ""; 

while((a = sis.readLine(b,0,b.length)) != -1){ 

s = new String(b,0,a); 

if((k = s.indexOf("filename=")) != -1){ 

s = s.substring(k 10); 

k = s.indexOf("""); 

s = s.substring(0,k); 

sourcefile[count] = s; 

k = s.lastIndexOf("."); 

suffix[count] = s.substring(k 1); 

System.out.println(suffix[count]); 

if(canTransfer(count)) transferfile(count); 

} 

if(!successful) break; 

} 

} 

public int getCount(){ 

return count; 

} 

public String[] getSourcefile(){ 

return sourcefile; 

} 



public void setObjectpath(String objectpath){ 

this.objectpath = objectpath; 

} 

public String getObjectpath(){ 

return objectpath; 

} 

private boolean canTransfer(int i){ 

suffix[i] = suffix[i].toLowerCase(); 

//这个是我用来传图片的，各位可以把后缀名改掉或者不要这个条件 

if(sourcefile[i].equals("")||(!suffix[i].equals("gif")&&!suffix[i].equals("jpg")&&!suffix[i].equals("jpeg"))) {description[i]="ERR suffix is wrong";return false;} 

else return true; 

} 

private void transferfile(int i){ 

String x = Long.toString(new java.util.Date().getTime()); 

try{ 

objectfilename[i] = x "." suffix[i]; 

FileOutputStream out = new FileOutputStream(objectpath objectfilename[i]); 

int a = 0; 

int k = 0; 

long hastransfered = 0;//标示已经传输的字节数 

String s = ""; 

while((a = sis.readLine(b,0,b.length)) != -1){ 

s = new String(b,0,a); 

if((k = s.indexOf("Content-Type:")) != -1) break; 

} 

sis.readLine(b,0,b.length); 

while((a = sis.readLine(b,0,b.length)) != -1){ 

s = new String(b,0,a); 

if((b[0]==45)&&(b[1]==45)&&(b[2]==45)&&(b[3]==45)&&(b[4]==45)) break; 

out.write(b,0,a); 

hastransfered =a; 

if(hastransfered>=size){ 

description[count] = "ERR The file " sourcefile[count] " is too large to transfer. The whole process is interrupted."; 

successful = false; 

break; 

} 

} 

if(successful) description[count] = "Right The file " sourcefile[count] " has been transfered successfully."; 

  count; 

out.close(); 

if(!successful){ 

sis.close(); 

File tmp = new File(objectpath objectfilename[count-1]); 

tmp.delete(); 

} 

} 

catch(IOException ioe){ 

description[i]=ioe.toString(); 

} 



} 



public transfer_multi(){ 

//可以在构建器里面构建服务器上传目录，也可以在javabean调用的时候自己构建 

setObjectpath("/home/www/jspvhost4/web/popeyelin/images/"); 

} 

}