jsp+javaBean 网站附件管理系统(未完成版)-3

处理附件上传的JSP页面与JAVA Bean 

 

<% @ page language = " java "  contentType = " text/html; charset=GB18030 "     pageEncoding = " GB18030 " %> <! DOCTYPE html PUBLIC  " -//W3C//DTD HTML 4.01 Transitional//EN "   " http://www.w3.org/TR/html4/loose.dtd " > < html > < head > < meta http - equiv = " Content-Type "  content = " text/html; charset=GB18030 " > < jsp:useBean id = " FUpload "  scope = " page "   class = " edu.scnu.crjy.common.UploadFiles " ></ jsp:useBean > </ head > < body > <%         String documentRoot  =  getServletContext().getRealPath( " / " );        String Dir  =  documentRoot + " appendfiles// " + request.getParameter( " childDir " );     out.println(request.getParameter( " childDir " ));     // 保存文件的路径，请确保目录存在，或改到其他目录      // 通过调用JavaBeans的方法完成上传操作      FUpload.setUploadDirectory(Dir);    FUpload.uploadFile(request); %> < script language = " javascript " >     alert( " 上传附件成功！ " );    document.location.href = " ../appendfileslist.jsp?childDir=<%=request.getParameter( " childDir " )%> " </ script > </ body > </ html >

注：这个处理上传的bean有大部分是从csdn中获得的资料

package  edu.scnu.crjy.common; import  java.io. * ; import  javax.servlet.http.HttpServletRequest; import  javax.servlet.ServletInputStream; import  javax.servlet.ServletException; public   class  UploadFiles  ... {    private static String newline = " "; // 设定换行符    private String uploadDirectory = "."; // 默认的保存位置    private String ContentType = ""; // 文件类型    private String CharacterEncoding = ""; // 编码格式    // 设定文件要保存在服务器中的位置    public void setUploadDirectory(String s) ...{        uploadDirectory = s;    }    // 提取文件名，本方法是把用户上传的文件按照原名保存    private String getFileName(String s) ...{        int i = s.lastIndexOf("/");        if (i < 0 || i >= s.length() - 1) ...{            i = s.lastIndexOf("/");            if (i < 0 || i >= s.length() - 1)                return s;        }        return s.substring(i + 1);    }    // 得到content-type    public void setContentType(String s) ...{        ContentType = s;        int j;        if ((j = ContentType.indexOf("boundary=")) != -1) ...{            ContentType = ContentType.substring(j + 9);            ContentType = "--" + ContentType;        }    }    // 得到文件编码格式    public void setCharacterEncoding(String s) ...{        CharacterEncoding = s;    }    public void uploadFile(HttpServletRequest req) throws ServletException,            IOException ...{        setCharacterEncoding(req.getCharacterEncoding());        setContentType(req.getContentType());        uploadFile(req.getInputStream());    }    public void uploadFile(ServletInputStream servletinputstream)            throws ServletException, IOException ...{        String s5 = null;        String filename = null;        byte Linebyte[] = new byte[4096];        byte outLinebyte[] = new byte[4096];        int ai[] = new int[1];        int ai1[] = new int[1];        String line;        // 得到文件名        while ((line = readLine(Linebyte, ai, servletinputstream,                CharacterEncoding)) != null) ...{            int i = line.indexOf("filename=");            if (i >= 0) ...{                line = line.substring(i + 10);                if ((i = line.indexOf(""")) > 0)                    line = line.substring(0, i);                break;            }        }        filename = line;        if (filename != null && !filename.equals(""")) ...{            filename = getFileName(filename);            String sContentType = readLine(Linebyte, ai, servletinputstream,                    CharacterEncoding);            if (sContentType.indexOf("Content-Type") >= 0)                readLine(Linebyte, ai, servletinputstream, CharacterEncoding);            // 建立新文件的文件句柄            File file = new File(uploadDirectory, filename);            // 建立生成新文件的输出流            FileOutputStream fileoutputstream = new FileOutputStream(file);            while ((sContentType = readLine(Linebyte, ai, servletinputstream,                    CharacterEncoding)) != null) ...{                if (sContentType.indexOf(ContentType) == 0 && Linebyte[0] == 45)                    break;                if (s5 != null) ...{                    // 写入新文件                    fileoutputstream.write(outLinebyte, 0, ai1[0]);                    fileoutputstream.flush();                }                s5 = readLine(outLinebyte, ai1, servletinputstream,                        CharacterEncoding);                if (s5 == null || s5.indexOf(ContentType) == 0                        && outLinebyte[0] == 45)                    break;                fileoutputstream.write(Linebyte, 0, ai[0]);                fileoutputstream.flush();            }            byte byte0;            if (newline.length() == 1)                byte0 = 2;            else                byte0 = 1;            if (s5 != null && outLinebyte[0] != 45                    && ai1[0] > newline.length() * byte0)                fileoutputstream.write(outLinebyte, 0, ai1[0]                        - newline.length() * byte0);            if (sContentType != null && Linebyte[0] != 45                    && ai[0] > newline.length() * byte0)                fileoutputstream.write(Linebyte, 0, ai[0] - newline.length()                        * byte0);            fileoutputstream.close();        }    }    // readLine函数把表单提交上来的数据按行读取    private String readLine(byte Linebyte[], int ai[],            ServletInputStream servletinputstream, String CharacterEncoding) ...{        try ...{ // 读取一行            ai[0] = servletinputstream.readLine(Linebyte, 0, Linebyte.length);            if (ai[0] == -1)                return null;        } catch (IOException ex) ...{            return null;        }        try ...{            if (CharacterEncoding == null) ...{                // 用默认的编码方式把给定的byte数组转换为字符串                return new String(Linebyte, 0, ai[0]);            } else ...{                // 用给定的编码方式把给定的byte数组转换为字符串                return new String(Linebyte, 0, ai[0], CharacterEncoding);            }        } catch (Exception ex) ...{            return null;        }    }}