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处理系统中的各类附件,上传下载-JSP教程,Java技巧及代码

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package com.highcom.object.common;

import java.io.*;import javax.servlet.*;import com.jspsmart.upload.*;import com.highcom.hcgip.basic.common.*;import javax.servlet.http.*;

/** * 处理系统中的各类附件。这些附件被保存到在config.properties中attachmentpath指定的路径下。 * <p>title: objective management system</p> * <p>description: </p> * <p>copyright: copyright (c) 2004</p> * @version 1.0 */

public class filekeeper    extends javax.servlet.http.httpservlet {    public static string base_dir;    static {        base_dir = propertiesreader.getconfigvalue("attachmentpath");    }

    public filekeeper() {    }

    public static string getrelativepath(java.io.file abs_path){        string fullpath= abs_path.getabsolutepath();        string new_fullpath = fullpath.replaceall("/","\\").tolowercase();        string new_base_dir = base_dir.replaceall("/","\\").tolowercase();        int i=new_fullpath.indexof(new_base_dir);        if(i<0){           return fullpath;        }else{            return  fullpath.substring(i);        }     }

    /**     * 上传一个文件,保存到指定文件夹。     * @param for_upload file 需要保存的文件     * @param relative_dir string 指定的文件夹(相对路径),路径用"\\"分割。     * @param rename boolean 是否要系统自动重命名为其它名字     * @return string 如果保存成功,返回相对地址。否则,返回null     */    public static string upload(com.jspsmart.upload.file for_upload,                                      string relative_dir, boolean rename) {        if (for_upload == null) {            return null;        }        if (relative_dir == null || relative_dir.length() == 0) {            relative_dir = "\\";        }        if (!relative_dir.startswith("\\")) {            relative_dir = "\\" + relative_dir;        }        if (!relative_dir.endswith("\\")) {            relative_dir = relative_dir + "\\";        }        java.io.file dir = new java.io.file(base_dir + relative_dir);        if (!dir.exists()) {            dir.mkdirs();        }        java.io.file saved = null;        if (rename) {            try {                saved = java.io.file.createtempfile("sys", "", dir);            }            catch (exception ex) {                ex.printstacktrace();                log.debug(ex, "filekeeper");            }

        }        else {            string filename = for_upload.getfilename();            saved = new java.io.file(dir.getabsolutepath() +                                     java.io.file.separator + filename);        }        if (saved == null) {            return null;        }        try {            for_upload.saveas(saved.getabsolutepath(),                              smartupload.save_physical);        }        catch (exception ex) {            ex.printstacktrace();            log.debug(ex, "filekeeper");            saved = null;        }        if(saved!=null){            return relative_dir + saved.getname();        }else{            return null;        }    }

    /**     * 取得一个指定文件的流。     * @param relative_path string 相对路径,包含文件名。     * @return inputstream 该文件的输入流,供外部程序读取。     */    public static inputstream download(string relative_path) {        if (!relative_path.startswith("\\")) {            relative_path = "\\" + relative_path;        }        java.io.file file = new java.io.file(base_dir + relative_path);        if (!file.exists()) {            return null;        }        else {            try {                return new fileinputstream(file);            }            catch (exception ex) {                ex.printstacktrace();                log.debug(ex, "filekeeper");                return null;            }

        }

    }    /**     * 删除指定文件。     * @param relative_path string 文件的相对路径。请不要以“/”开头。可以用"\"开头,也可以不用。     */    public static void delete(string relative_path){        if(!relative_path.startswith("\\")){            relative_path = "\\"+relative_path;        }        java.io.file file = new java.io.file(base_dir+relative_path);        if(file.exists() && file.isfile()){            file.delete();        }

    }

    public void dopost(httpservletrequest request, httpservletresponse response) throws        servletexception, ioexception {        //system.out.println("do post….");        doget(request, response);    }    /**     * 处理下载文件的请求。需要在request中提供三个参数:     * 1.path,说明需要下载的文件的相对路径,包含磁盘文件名本身。     * 2.filename,说明一个文件名,这个文件名将成为用户保存文件时的默认用户名。如果不提供,系统取在path中的文件名     * 3.mime,说明文件的mime_type。如果不提供,默认为"application/*"。     * @param request httpservletrequest     * @param response httpservletresponse     * @throws servletexception     * @throws ioexception     */    public void doget(httpservletrequest request, httpservletresponse response) throws        servletexception, ioexception {        //system.out.println("filekeeper do get…");

        string relative_path = parameterparser.getstrpara(request, "path");        string filename = parameterparser.getstrpara(request, "filename");        string mime = parameterparser.getstrpara(request, "mime");

        if (mime.length() > 0) {            response.setcontenttype(mime);        }        else {            response.setcontenttype("application/*");        }        response.setheader("content-disposition",                           "attachment;filename=" + filename);

        inputstream in = download(relative_path);

        if (in == null) {            log.debug("文件" + filename + "不存在.", this);            response.getoutputstream().close();            return;        }        byte[] b = new byte[1024];        int len;        while ( (len = in.read(b)) > 0) {            response.getoutputstream().write(b, 0, len);        }        in.close();        response.getoutputstream().flush();        response.getoutputstream().close();

    }

}

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