上传文件的Bean

java 代码

import java.io.*;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;

public class transfer_multi {

    public String[] sourcefile = new String[255];// 源文件名
    public String objectpath = "c:/";// 目标文件目录
    public String[] suffix = new String[255];// 文件后缀名
    public String[] objectfilename = new String[255];// 目标文件名
    public ServletInputStream sis = null;// 输入流
    public String[] description = new String[255];// 描述状态
    public long size = 100 * 1024;// 限制大小
    private int count = 0;// 已传输文件数目
    private byte[] b = new byte[4096];// 字节流存放数组
    private boolean successful = true;

    public void setSourcefile(HttpServletRequest request)
            throws java.io.IOException {
        sis = request.getInputStream();
        int a = 0;
        int k = 0;
        String s = "";
        while ((a = sis.readLine(b, 0, b.length)) != -1) {
            s = new String(b, 0, a);
            if ((k = s.indexOf("filename=")) != -1) {
                s = s.substring(k + 10);
                k = s.indexOf("");
                s = s.substring(0, k);
                sourcefile[count] = s;

                k = s.lastIndexOf(".");
                suffix[count] = s.substring(k + 1);
                System.out.println(suffix[count]);
                if (canTransfer(count))
                    transferfile(count);
            }
            if (!successful)
                break;
        }
    }

    public int getCount() {
        return count;
    }

    public String[] getSourcefile() {
        return sourcefile;
    }

    public void setObjectpath(String objectpath) {
        this.objectpath = objectpath;
    }

    public String getObjectpath() {
        return objectpath;
    }

    private boolean canTransfer(int i) {
        suffix[i] = suffix[i].toLowerCase();
        // 这个是我用来传图片的，各位可以把后缀名改掉或者不要这个条件
        if (sourcefile[i].equals("")
                || (!suffix[i].equals("gif") && !suffix[i].equals("jpg") && !suffix[i]
                        .equals("jpeg"))) {
            description[i] = "ERR suffix is wrong";
            return false;
        } else
            return true;
    }

    private void transferfile(int i) {
        String x = Long.toString(new java.util.Date().getTime());
        try {
            objectfilename[i] = x + "." + suffix[i];
            FileOutputStream out = new FileOutputStream(objectpath
                    + objectfilename[i]);
            int a = 0;
            int k = 0;
            long hastransfered = 0;// 标示已经传输的字节数
            String s = "";
            while ((a = sis.readLine(b, 0, b.length)) != -1) {
                s = new String(b, 0, a);
                if ((k = s.indexOf("Content-Type:")) != -1)
                    break;
            }
            sis.readLine(b, 0, b.length);
            while ((a = sis.readLine(b, 0, b.length)) != -1) {
                s = new String(b, 0, a);
                if ((b[0] == 45) && (b[1] == 45) && (b[2] == 45)
                        && (b[3] == 45) && (b[4] == 45))
                    break;
                out.write(b, 0, a);
                hastransfered += a;
                if (hastransfered >= size) {
                    description[count] = "ERR The file "
                            + sourcefile[count]
                            + " is too large to transfer. The whole process is interrupted.";
                    successful = false;
                    break;
                }
            }
            if (successful)
                description[count] = "Right The file " + sourcefile[count]
                        + " has been transfered successfully.";
            ++count;
            out.close();
            if (!successful) {
                sis.close();
                File tmp = new File(objectpath + objectfilename[count - 1]);
                tmp.delete();
            }
        } catch (IOException ioe) {
            description[i] = ioe.toString();
        }

    }

    public transfer_multi() {
        // 可以在构建器里面构建服务器上传目录，也可以在javabean调用的时候自己构建
        setObjectpath("/home/www/jspvhost4/web/popeyelin/images/");
    }
}

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文件上传原理简单实现 | JAVA中文件操作大全

• 2007-06-01 11:35
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