日期:2014-05-16  浏览次数:20497 次

jsp文件上传(已经过时看第3篇 )
jsp代码:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
 
  <body> 
                                                 <!-- encType 必不可少 -->
    <form action="upImgServlet" method="post" encType=multipart/form-data>
        
        描述:
        <input type="text" name="description"/><br/>选择图片:
        <input type="file" name="img"/>
        <input type="submit" value="提交"/>
    </form>
  </body>
</html>


UpImgServlet 的代码:

public class UpImgServlet extends HttpServlet {

    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

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

        response.setContentType("text/html");
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");

        // org.apache.commons.fileupload.DiskFileUpload 是一个开源包里的。
        DiskFileUpload du = new DiskFileUpload();
        du.setSizeMax(4194304); // 设置最大文件尺寸,这里是4MB
        du.setSizeThreshold(4096);// 设置缓存区大小 ,4 kb;
        // up 为 /WebRoot 下的 一个目录
        du.setRepositoryPath(request.getSession().getServletContext()
                .getRealPath("/up"));// 设置缓存目录

        // 得到所有文件
        try {
            List list = du.parseRequest(request);
            Iterator it = list.iterator();
            while (it.hasNext()) {
                org.apache.commons.fileupload.FileItem fileItem = (FileItem) it
                        .next();

                // 是否为表单元素。如文本框 等等。
                if (fileItem.isFormField()) {
                    String name = fileItem.getFieldName();
                
                    //通过流 用来读取表单元素里的内容。
                    java.io.BufferedReader br = new BufferedReader(
                               new InputStreamReader(fileItem.getInputStream()));
                    
                    //如果还有除文件域以外的其他表单元素 就用 if()进行名字一一匹配。
                    if(name.equals("description")){
                        String contents =  br.readLine();
                        System.out.println(contents);
                        
                    }
                    
                }
                // 文件域
                else {
                    // 获得文件名,这个文件名包括路径:
                    String fileName = fileItem.getName();
                    int index = fileName.lastIndexOf('.');
                    fileName = fileName.substring(index);
                    fileName = this.getFileName() + fileName;                                    //文件保存位置 
                    fileItem.write(new File(request.getSession().getServletContext().getRealPath("/img")+ "\" + fileName));
                    
                    System.out.println("上传成功");
                }
            }

        } catch (FileUploadException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        PrintWriter out = response.getWriter();

        out.flush();
        out.close();
    }

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

    public void init() throws ServletException {
        // Put your code here
    }

    // 以日期 获得一个文件名。(不重复);
    String getFileName() {
        java.util.Calendar cal = Calendar.getInstance();

        int year = cal.get(Calendar.YEAR);
        int mon = cal.get(Calendar.MONTH);
        int day = cal.get(Calendar.DATE);
        int hour = cal.get(Calendar.HOUR);
        int min = cal.get(Calendar.MINUTE);
        int sec = cal.get(Calendar.SECOND);
        int mi = cal