java怎么把文件传输到服务器

String realpath = ServletActionContextgetServletContext()getRealPath("/upload") ;//获取服务器路径

String[] targetFileName = uploadFileName;

for (int i = 0; i < uploadlength; i++) {

File target = new File(realpath, targetFileName[i]);

FileUtilscopyFile(upload[i], target);

//这是一个文件复制类copyFile()里面就是IO操作，如果你不用这个类也可以自己写一个IO复制文件的类

}

其中private File[] upload;// 实际上传文件

private String[] uploadContentType; // 文件的内容类型

private String[] uploadFileName; // 上传文件名

这三个参数必须这样命名，因为文件上传控件默认是封装了这3个参数的，且在action里面他们应有get，set方法

在jsp/servlet中断点/多线程下载文件

<%@ page import="javaioIOException" %>

<%@ page import="javaioOutputStream" %>

<%@ page import="javaioRandomAccessFile" %>

<%!

    public void downloadFile(HttpServletRequest request, HttpServletResponse response, File file) throws IOException {

        RandomAccessFile raf = new RandomAccessFile(file, "r");

        javaioFileInputStream fis = new javaioFileInputStream(rafgetFD());

        responsesetHeader("Server", "wwwtrydonecom");

        responsesetHeader("Accept-Ranges", "bytes");

        long pos = 0;

        long len;

        len = raflength();

        if (requestgetHeader("Range") != null) {

            responsesetStatus(HttpServletResponseSC_PARTIAL_CONTENT);

            pos = LongparseLong(requestgetHeader("Range")

                    replaceAll("bytes=", "")

                    replaceAll("-", "")

            );

        }

        responsesetHeader("Content-Length", LongtoString(len - pos));

        if (pos != 0) {

            responsesetHeader("Content-Range", new StringBuffer()

                    append("bytes ")

                    append(pos)

                    append("-")

                    append(LongtoString(len - 1))

                    append("/")

                    append(len)

                    toString()

            );

        }

        responsesetContentType("application/octet-stream");

        responsesetHeader("Content-Disposition", new StringBuffer()

                append("attachment;filename=\"")

                append(filegetName())

                append("\"")toString());

        rafseek(pos);

        byte[] b = new byte[2048];

        int i;

        OutputStream outs = responsegetOutputStream();

        while ((i = rafread(b)) != -1) {

            outswrite(b, 0, i);

        }

        rafclose();

        fisclose();

    }

%>

<%

    String filePath = requestgetParameter("file");

    filePath = applicationgetRealPath(filePath);

    File file = new File(filePath);

    downloadFile(request, response, file);

%>