Javaweb文件上传的一个简单工具类

这是我根据别的例子还有自己的一些想法写的，很简单的，适合初学者看看。

package com.zxj.test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.Calendar;
import java.util.List;

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;

public class FileUploadDemo {

public void test(HttpServletRequest request,HttpServletResponse response){  
    try {
        //设定编码格式
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("utf-8");
        //1、建立一个DiskFileItemFactory工厂
        DiskFileItemFactory factory=new DiskFileItemFactory();
        //2、建立一个文件上传解析器
        ServletFileUpload upload=new ServletFileUpload(factory);
        //3、解决上传文件的中文乱码
        upload.setHeaderEncoding("UTF-8");
        factory.setSizeThreshold(1024*500);//设置内存的临界值味500k
        File temporary=new File("D:\\files");//设置当超过500K的时候存放到临时文件中
        factory.setRepository(temporary);
        upload.setSizeMax(1024*1024*5);//设置上传的文件总的大小不能超过5M

        try {
            //1、得到FileItem的集合items
            List<FileItem> items=upload.parseRequest(request);
            //2、遍历items
            for (FileItem item : items) {
                //1、若是一般的表单，打印
                if(item.isFormField()){
                    String name=item.getFieldName();
                    String value=item.getString("UTF-8");
                    System.out.println("name="+name+",value="+value);
                }else{//2、若是文件则保存到目标文件中
                    String fileName=item.getFieldName();
                    long fileByte=item.getSize();

                    //得到当前年份月份日期
                    Calendar now=Calendar.getInstance();
                    String year=String.valueOf(now.get(Calendar.YEAR));
                    String month=String.valueOf(now.get(Calendar.MONTH));
                    String day=String.valueOf(now.get(Calendar.DAY_OF_MONTH));

                    String mils=String.valueOf(System.currentTimeMillis());

                    String prefix=fileName.substring(fileName.lastIndexOf(".")+1);

                    if(prefix.equals("jpg")){
                        System.out.println("请上传图片");
                    }

                    String fileName1= fileName.substring(0,fileName.lastIndexOf('.'));
                    fileName=fileName.replace(fileName1,mils);

                    //输入流
                    InputStream in=item.getInputStream();
                    byte[] buffer=new byte[1024];
                    int len=0;

                    String rest="d:\\files\\"+year+"\\"+month+"\\"+day+"\\";
                    //如果没有路径就创建
                    if(!new File(rest).exists()){
                        new File(rest).mkdir();
                    }

                    //存储地址
                    fileName=rest+fileName;

                    //输出流
                    OutputStream out=new FileOutputStream(fileName);
                    while((len=in.read(buffer))!=-1){
                        out.write(buffer,0,len);
                    }
                    out.close();
                    in.close();                     
                }


            }
        } catch (FileUploadException e) {               
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    } catch (UnsupportedEncodingException e) {          
        e.printStackTrace();
    }
}

}