最近需要用到jquery文件上传插件,发现plupload这东西挺好的,奈何后台代码是php,tomcat得配置php才能跑起来,于是稍微研究了下,改成了java代码
plupload的特色是
1、可以配置chunk,将一个大文件分成许多小文件上传,后台通过php合并成大文件,这里通过相应的java代码
2、实际上传的文件名是经过生成唯一的uuid,通过参数name传递到后台
3、上传文件的过程是先上传临时命名为uuid的临时文件,上传成功后会自动生成几个input标签,对应上传之后的临时文件的文件名,之后通过另一个action调用uploadFinish对临时文件进行重命名 操作或者其他操作
这个java代码是基于 Struts2的,不是servlet,反正都是类似的 在这基础上也容易改
public class UploadAction extends ActionSupport { private static final int BUFFER_SIZE = 2 * 1024; private File upload; private String name; //plupload上传文件的临时文件名 uuid.文件后缀 private String uploadFileName; private String uploadContentType; private int chunk; private int chunks; // 。。。一堆getter setter自己生成 private void copy(File src, File dst) { InputStream in = null; OutputStream out = null; try { if (dst.exists()) { out = new BufferedOutputStream(new FileOutputStream(dst, true), BUFFER_SIZE); //plupload 配置了chunk的时候新上传的文件appand到文件末尾 } else { out = new BufferedOutputStream(new FileOutputStream(dst), BUFFER_SIZE); } in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE); byte[] buffer = new byte[BUFFER_SIZE]; int len = 0; while ((len = in.read(buffer)) > 0) { out.write(buffer, 0, len); } } catch (Exception e) { e.printStackTrace(); } finally { if (null != in) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } if (null != out) { try { out.close(); } catch (IOException e) { e.printStackTrace(); } } } } public String upload() throws Exception { String dstPath = ServletActionContext.getServletContext().getRealPath("\\tmp") + "\\" + this.getName(); // 保存目录可以自己配置 或者定义变量自行配置 File dstFile = new File(dstPath); // 文件已存在删除旧文件(上传了同名的文件) if (chunk == 0 && dstFile.exists()) { dstFile.delete(); dstFile = new File(dstPath); } copy(this.upload, dstFile); //System.out.println(uploadFileName + " " + uploadContentType + " " + chunk + " " + chunks); if (chunk == chunks - 1) { // 一个完整的文件上传完成 } return SUCCESS; } public String uploadFinish() { String dstPath = ServletActionContext.getServletContext().getRealPath("\\tmp"); HttpServletRequest request = ServletActionContext.getRequest(); int count = Integer.parseInt(request.getParameter("uploader_count")); for (int i = 0; i < count; i++) { uploadFileName = request.getParameter("uploader_" + i + "_name"); name = request.getParameter("uploader_" + i + "_tmpname"); System.out.println(uploadFileName + " " + name); try { //对已经上传成功的临时文件进行操作 } catch(Exception e) { } } return SUCCESS; } }
补充:
从项目里抽取出了文件上传的代码,单独一个eclipse上可以跑的例子,上传上来了(注意build path里的jre路径)
原创,欢迎转载,请标明源
http://asyty.iteye.com/blog/1230119/