源码--文件上传

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.util.List;
import java.util.UUID;

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.ProgressListener;
import org.apache.commons.fileupload.FileUploadBase.FileSizeLimitExceededException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.itheima.util.IOUtils;

public class UploadServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");
        try{
            //1.创建工厂
            DiskFileItemFactory factory = new DiskFileItemFactory();
            factory.setSizeThreshold(100*1024);
            factory.setRepository(new File(this.getServletContext().getRealPath("WEB-INF/temp")));
            //2.生产文件上传核心类
            ServletFileUpload fileUpload = new ServletFileUpload(factory);
            
            //--检查是否是正确的文件上传表单
            if(!fileUpload.isMultipartContent(request)){
                throw new RuntimeException("请用正确的表单进行上传!");
            }
            //--设置文件上传的大小限制
           fileUpload.setFileSizeMax(1024*1024*100);//单个文件不大于10M
           fileUpload.setSizeMax(1024*1024*100);//总大小不大于100M
            
            //--设置编码集,解决上传文件名的乱码问题
            fileUpload.setHeaderEncoding("utf-8");
            
            //--设置文件上传监听
            fileUpload.setProgressListener(new ProgressListener(){
                Long beginTime = System.currentTimeMillis();
                public void update(long bytesRead, long contentLength, int items) {
                    BigDecimal br = new BigDecimal(bytesRead).divide(new BigDecimal(1024),2,BigDecimal.ROUND_HALF_UP);
                    BigDecimal cl = new BigDecimal(contentLength).divide(new BigDecimal(1024),2,BigDecimal.ROUND_HALF_UP);
                    System.out.print("当前读取的是第"+items+"个上传项,总大小"+cl+"KB,已经读取"+br+"KB");
                    //剩余字节数
                    BigDecimal ll = cl.subtract(br);
                    System.out.print("剩余"+ll+"KB");
                    //上传百分比
                    BigDecimal per = br.multiply(new BigDecimal(100)).divide(cl,2,BigDecimal.ROUND_HALF_UP);
                    System.out.print("已经完成"+per+"%");
                    //上传用时
                    Long nowTime = System.currentTimeMillis();
                    Long useTime = (nowTime - beginTime)/1000;
                    System.out.print("已经用时"+useTime+"秒");
                    //上传速度
                    BigDecimal speed = new BigDecimal(0);
                    if(useTime!=0){
                        speed = br.divide(new BigDecimal(useTime),2,BigDecimal.ROUND_HALF_UP);
                    }
                    System.out.print("上传速度为"+speed+"KB/S");
                    //大致剩余时间
                    BigDecimal ltime = new BigDecimal(0);
                    if(!speed.equals(new BigDecimal(0))){
                        ltime = ll.divide(speed,0,BigDecimal.ROUND_HALF_UP);
                    }
                    System.out.print("大致剩余时间为"+ltime+"秒");
                    
                    System.out.println();
                }
                
            });
            
            //3.利用文件上传核心类解析request
            List<FileItem> list = fileUpload.parseRequest(request);

            //4.遍历所有的FileItem
            for(FileItem item : list){
                if(item.isFormField()){

                    //当前是一个普通的字段项
                    String name = item.getFieldName();
                    String value = item.getString("utf-8");
                    System.out.println(name+":"+value);
                }else{

                    //当前是一个文件上传项
                    String filename = item.getName();
                    String uuidName = UUID.randomUUID().toString()+"_"+filename;
                    
                    int hash = uuidName.hashCode();
                    String hashStr = Integer.toHexString(hash);
                    char [] hss = hashStr.toCharArray();
                    String path = this.getServletContext().getRealPath("WEB-INF/upload");
                    for(char c : hss){
                        path+="/"+c;
                    }
                    new File(path).mkdirs();
                    
                    InputStream in = item.getInputStream();
                    OutputStream out = new FileOutputStream(new File(path,uuidName));
                    
                    IOUtils.In2Out(in, out);
                    IOUtils.close(in, out);
                    
                    //--删除临时文件
                    item.delete();
                }
            }
        }catch (FileSizeLimitExceededException e) {
            response.getWriter().write("单个文件不超过10M,总大小不超过100M!");
            return;
        }catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

   
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }

}

 //收集文件信息，保存到数据库中，将上传文件的路径，保存到数据库中
     //设置Map
     Map map=new HashMap();
    //获取到上传者的ip
     map.put("ip", request.getRemoteAddr());
    for(FileItem item:fileItems){
                if(item.isFormField()){
                    String name=item.getFieldName();
                    String value=item.getString("utf-8");
                    map.put(name, value);
                }else{//文件上传
                    //--uuidname防止文件名重复
                    String realname = item.getName();
                    String uuidname = UUID.randomUUID().toString()+"_"+realname;
                    map.put("realname", realname);
                    map.put("uuidname", uuidname);
                }
}

        map.put("savepath", savepath);

        //2.向数据库中插入数据
            Resource r = new Resource();
            BeanUtils.populate(r, map);
           
            String sql ="insert into netdisk values(null,?,?,?,?,null,?)";
            QueryRunner runner = new QueryRunner(DbUtil.getDataSource());
            runner.update(sql,r.getUuidname(),r.getRealname(),r.getSavepath(),r.getIp(),r.getDescription());