import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.servlet.ServletContext;
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;

/**
 * Servlet implementation class FileUploadServlet
 */
public class FileUploadServlet extends HttpServlet
{
    private static final long serialVersionUID = 1L;

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

    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        //解决post请求乱码
        request.setCharacterEncoding("utf-8");
        /*String name = request.getParameter("name");
        String photo = request.getParameter("photo");
        System.out.println(name+"--"+photo);
        */
        //获取一个流
        /*ServletInputStream in = request.getInputStream();
        String str = IOUtils.toString(in);
        System.out.println(str);*/
        //获取一个工厂类实例
        DiskFileItemFactory factory=new DiskFileItemFactory();
        //创建解析器实例
        ServletFileUpload fileUpload=new ServletFileUpload(factory);
        try
        {
            //解析request
            List<FileItem> fileItems = fileUpload.parseRequest(request);
            //System.out.println(fileItems.size());
            //遍历fileItems,读取表单的信息
            for (FileItem fileItem : fileItems)
            {
                //判断当前表单项是否是一个普通表单项
                if(fileItem.isFormField())
                {
                    //获取属性名
                    String fieldName = fileItem.getFieldName();
                    //获取属性值
                    String value = fileItem.getString("utf-8");
                    System.out.println(fieldName+"="+value);
                }else 
                {
                    //如果是文件表单项
                    //获取文件的大小
                    long size = fileItem.getSize();
                    //获取文件的类型
                    String contentType = fileItem.getContentType();
                    //获取文件的名字
                    String name = fileItem.getName();
                    
                    //获取表单项的属性名
                    String fieldName = fileItem.getFieldName();
                    System.out.println("文件的大小:"+size);
                    System.out.println("文件的类型:"+contentType);
                    System.out.println("文件的名字:"+name);
                    System.out.println("表单项name属性名:"+fieldName);
                    //获取ServletContext对象
                    ServletContext context = this.getServletContext();
                    //获取项目的真实路径
                    String path = context.getRealPath("/upload");
                    //判断路径是否存在
                    File file=new File(path);
                    if(!file.exists())
                    {
                        //如果不存在该路径，则创建一个路径
                        file.mkdirs();
                    }
                    
                    System.out.println(path);
                    //将文件写入到磁盘中
                    fileItem.write(new File(path+"/"+name));
                    
                }
                
            }
            
        } catch (FileUploadException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Exception e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
        
    }

}