使用FileUpload上传文件的主要Java代码，fileupload上传文件,import java.

使用FileUpload上传文件的主要Java代码，fileupload上传文件,import java.

import java.io.File;import java.io.IOException;import java.util.List;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.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class UploadServlet extends HttpServlet {    @SuppressWarnings("unchecked")    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        System.out.println("--------------upload-----------");        DiskFileItemFactory factory = new DiskFileItemFactory();        factory.setSizeThreshold(1024 * 1024); // 设置缓存大小，单位KB        String path = request.getRealPath("/upload"); // 得到当前项目upload目录的绝对路径        factory.setRepository(new File(path)); // 设置文件临时存储路径为path        ServletFileUpload upload = new ServletFileUpload(factory);        try {            List<FileItem> list = upload.parseRequest(request);            for (FileItem item : list) {                // 如果item是普通表单字段                if (item.isFormField()) {                    String name = item.getFieldName(); // 得到表单字段的name属性值                    String value = item.getString("gbk"); // 得到表单字段值，编码采用gbk                    request.setAttribute(name, value);                } else {                    String name = item.getFieldName();                    String value = item.getName(); // 得到上传文件的路径(根据浏览器不同可能会有所差异)                    int start = value.lastIndexOf("\\");                    String fileName = value.substring(start + 1); // 截取最后一个\之后的字符，即行到上传文件名                    request.setAttribute(name, fileName);                    item.write(new File(path, fileName)); // 在硬盘上写入文件                    // 自己用流写的方法                    // OutputStream os = new FileOutputStream(new                    // File(path,fileName));                    // InputStream is = item.getInputStream();                    // byte[] buffer = new byte[500];                    // int length = 0;                    // while((length = is.read(buffer))>0){                    // os.write(buffer, 0, length);                    // }                    // os.close();                    // is.close();                }            }        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        request.getRequestDispatcher("upload/result.jsp").forward(request,                response);    }}