fileupload.java

用于往服务器上传图片的工具类,

package com.trisun.util;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
/**
 * @author qjs
 * @Date : 2006-09-21
 * Description: 
 * 		用于上传文件的servlet, 
 * 参数有：
 * 		type: 子系统的类型
 * 		path: 保存文件的相对地址
 * 		rewritable: 1=可重写文件。 0-如果文件已经存在则出错。
 * -----------------
 * 
 */ 

public class FileUpload extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	private int maxPostSize = 100 * 1024 * 1024;

	public void doPost(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		res.setContentType("text/html; charset=UTF-8");
		req.setCharacterEncoding("UTF-8");
	
		//读入图片的目录信息
		String uploadPath =null;
		Properties fileprops = new Properties();
		fileprops.load(new FileInputStream(PropsUtil.getWebPath()+ ConfigInfo.propFile_common));
		uploadPath = fileprops.getProperty(ConfigInfo.propName_upload);
		
		//读入指定的子目录信息
		String typePath = req.getParameter("type");
		
		if ((typePath!=null) && typePath.length()>0)
		{ 
			uploadPath = uploadPath + typePath +"\\";
		}
		if (typePath!=null) System.out.println("typePath out");
	
		String subPath = req.getParameter("path");
		if ((subPath!=null) && subPath.length()>0){
			uploadPath = uploadPath + subPath +"\\";
		}
		boolean isRewritable=(req.getParameter("rewritable").equals("1")?true:false);
		String fileName = req.getParameter("fileName");
		System.out.println(" full path  "+ uploadPath);
		
		try     
		  {     
			File   file   =   new   File(uploadPath);
			System.out.println("uploadPath's file:  getAbsolutePath="+ file.getAbsolutePath() +"  path="+ file.getPath());
			if(!file.exists())	file.mkdirs();
		  }     
		  catch(Exception   ex)     
		  {     
			  System.out.println("建立子目录失败");     
		  }     
	
		DiskFileItemFactory factory = new DiskFileItemFactory();
		factory.setSizeThreshold(4096);

		ServletFileUpload upload = new ServletFileUpload(factory);
		upload.setSizeMax(maxPostSize);
		try {
			List fileItems = upload.parseRequest(req);
			Iterator iter = fileItems.iterator();
			while (iter.hasNext()) {
				FileItem item = (FileItem) iter.next();
				if (!item.isFormField()) {
					String name = item.getName();
					System.out.println("uploadPath=" + uploadPath + ",oldFileName=" + name + ",newFileName=" + fileName);
					File file = rename(name,fileName);					
					try {
						//item.write(file);
						InputStream stream=item.getInputStream();// 把文件读入
						OutputStream bos=new FileOutputStream(uploadPath + fileName);
						int bytesRead=0;
						byte[] buffer=new byte[8192];
						while((bytesRead=stream.read(buffer,0,8192))!=-1){
							bos.write(buffer,0,bytesRead);// 将文件写入服务器
						}
						bos.close();
						stream.close();
					} catch (Exception e) {
						e.printStackTrace();
					}
					/*try {
						File file=new File(uploadPath + name);
						if(file.exists()&&(isRewritable==false)){
							throw new IOException("文件名已经存在！");
						}
						
						String[] arr = {};
						if(!name.trim().equals("")){
							arr = name.split(".");
						}
						System.out.println("uploadPath=" + uploadPath + ",fileName=" + str + ",fileType=" + arr[1]);
						item.write(new File(uploadPath + str + "." + arr[1]));
					}catch (IOException e){
						throw e;
					}
					catch (Exception e) {
						e.printStackTrace();
					}*/
				}
			}
		} catch (FileUploadException e) {
			e.printStackTrace();
		}
	}
	
	private File rename(String oldName,String newName){
		int dot=oldName.lastIndexOf(".");
		String ext=null;
		if(dot!=-1){
			ext=oldName.substring(dot); // includes "."
		}
		File f=new File(newName+ext);
		createNewFile(f);
		return f;
	}
	private boolean createNewFile(File f) {
	    try {
	      return f.createNewFile();
	    } catch (IOException ignored) {
	      return false;
	    }
	}
}