java工具类------pad文件上传-蒲公英云

1.在这里简单说一下这块的知识，因为在开发中遇到了，所以我整理了一下这块的知识,这边封装的是一个sevlet，所以一定要记着在web.xml中配置，这块不做过多赘述，下面直接说代码，代码如下：

import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Calendar;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;
public class PdfUpload extends HttpServlet
{
    private static final long serialVersionUID = 1L;
    private long size;
    private BufferedImage bsrc;
    private String type;
    public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{         
        doPost(request,response);         //将get请求和post请求统一发送给doPost处理     } 
    }
    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        response.setCharacterEncoding("UTF-8");
        String returnMessage = "{status:'SUCCESS', data:''}";
        response.addHeader("Access-Control-Allow-Origin", "*");
        response.addHeader("Access-Control-Allow-Headers", "apptypeid,platformid,city,district,Content-Type, Authorization, Accept,X-Requested-With");
        response.addHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS");
        Calendar date = Calendar.getInstance();
        String saveDirectory = request.getSession().getServletContext().getRealPath("/upload"); // 在磁盘上保存的路径
        //String saveDirectory = "C:/Users/Administrator/Desktop";
        String saveUrl = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/upload";
        String saveImgUrl = "";
        System.out.println("服务器的路径============="+saveDirectory);
        System.out.println("保存的路径============"+saveUrl);
        // 新建对应日期文件夹
        int iYear = date.get(Calendar.YEAR);
        saveDirectory += File.separator + iYear;
        saveUrl += "/" + iYear;
        int iMonth = date.get(Calendar.MONTH) + 1;
        saveDirectory += File.separator + iMonth;
        saveUrl += "/" + iMonth;
        int iDay = date.get(Calendar.DATE);
        saveDirectory += File.separator + iDay;
        saveUrl += "/" + iDay;
        File f = new File(saveDirectory);
        if (!f.isDirectory())
        {
            f.mkdirs();
        }
        if (ServletFileUpload.isMultipartContent(request))
        {
            DiskFileItemFactory dff = new DiskFileItemFactory();
            dff.setRepository(f);
            dff.setSizeThreshold(1024000);
            ServletFileUpload sfu = new ServletFileUpload(dff);
            FileItemIterator fii = null;
            try
            {
                fii = sfu.getItemIterator(request);
            }
            catch (FileUploadException e1)
            {
                e1.printStackTrace();
            }
            String saveFilePath = ""; // 图片地址
            try
            {
                int iIndex = 0;
                while (fii.hasNext())
                {
                    FileItemStream fis = fii.next();
                    try
                    {
                        if (!fis.isFormField() && fis.getName().length() > 0)
                        {
                            iIndex++;
                            String saveFileName = iYear + "" + iMonth + "" + iDay + "" + date.get(Calendar.HOUR) + date.get(Calendar.MINUTE) + "" + date.get(Calendar.SECOND) + "-" + iIndex + ".pdf";
                            saveFilePath = saveDirectory + File.separator + saveFileName;
                            saveUrl += "/" + saveFileName;
                            BufferedInputStream in = new BufferedInputStream(fis.openStream());
                            FileOutputStream a = new FileOutputStream(new File(saveFilePath));
                            BufferedOutputStream output = new BufferedOutputStream(a);
                            Streams.copy(in, output, true);// 开始把文件写到你指定的上传文件夹
                            String imgName = iYear + "" + iMonth + "" + iDay + "" + date.get(Calendar.HOUR) + date.get(Calendar.MINUTE) + "" + date.get(Calendar.SECOND) + "-" + iIndex+"jpg";
                            saveImgUrl += saveDirectory + File.separator + imgName;
                            System.out.println("完整路径================================="+saveUrl);
                            System.out.println("图片路径================================="+saveImgUrl);
                            PDF_to_JPGFuncation funcation = new PDF_to_JPGFuncation();
                            PDF_to_JPGFuncation.tranfer(saveFilePath,
                                    saveImgUrl, 1);
                            type = fis.getName().substring(fis.getName().lastIndexOf(".")).toLowerCase();
                        }
                    }
                    catch (Exception e)
                    {
                        e.printStackTrace();
                        returnMessage =  "{\"status\":\"ERROR\",\"data\":\"\"}";
                    }
                }
                if (returnMessage.indexOf("status:'SUCCESS'") > -1)
                {
                    String savePath=saveFilePath.replaceAll("\\\\", "/");
                    returnMessage =  "{\"status\":\"OK\",\"data\":\"" + savePath + "\"}";
                }
            }
            catch (FileUploadException e)
            {
                e.printStackTrace();
                returnMessage =  "{\"status\":\"ERROR\",\"data\":\"\"}";
            }
            //String urlEncoder = URLEncoder.encode(returnMessage, "utf-8");
            //String url = urlEncoder.replace("+", "%20");
            response.getWriter().println(returnMessage);
        }
    }
    private String readFileItem(FileItemStream fis) throws IOException
    {
        BufferedInputStream in = new BufferedInputStream(fis.openStream());
        byte[] bytes = readStream(in);
        if (bytes != null && bytes.length > 0)
        {
            try
            {
                return new String(bytes, 0, bytes.length);
            }
            catch (Exception e)
            {
                return "";
            }
        }
        return "";
    }
    private byte[] readStream(InputStream networkStream) throws IOException
    {
        byte[] bytes = new byte[100];
        byte[] bytecount = null;
        int n = 0;
        int ilength = 0;
        try
        {
            while ((n = networkStream.read(bytes)) >= 0)
            {
                if (bytecount != null)
                {
                    ilength = bytecount.length;
                }
                byte[] tempbyte = new byte[ilength + n];
                if (bytecount != null)
                {
                    System.arraycopy(bytecount, 0, tempbyte, 0, ilength);
                }
                System.arraycopy(bytes, 0, tempbyte, ilength, n);
                bytecount = tempbyte;
                if (n == -1)
                    break;
            }
        }
        finally
        {
            networkStream.close();
        }
        return bytecount;
    }
    public void delFile(String filename)
    {
        File file = new File(filename);
        if (file.isFile() && file.exists())
        {
            file.delete();
            System.out.println("删除成功");
        }
        else
        {
            System.out.println("要删除的文件不存在");
        }
    }
}

另外在这个方法中涉及到了一个类，代码如下：

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
import org.icepdf.core.exceptions.PDFException;
import org.icepdf.core.exceptions.PDFSecurityException;
import org.icepdf.core.pobjects.Document;
import org.icepdf.core.pobjects.Page;
import org.icepdf.core.util.GraphicsRenderingHints;
public class PDF_to_JPGFuncation {
    public static final String FILETYPE_JPG = "jpg";
    public static final String SUFF_IMAGE = "." + FILETYPE_JPG;
    public static void tranfer(String filepath, String imagepath, float zoom)
            throws PDFException, PDFSecurityException, IOException {
        Document document = null;
        float rotation = 0f;
        document = new Document();
        document.setFile(filepath);
        BufferedImage img = (BufferedImage) document.getPageImage(0, GraphicsRenderingHints.SCREEN,
                Page.BOUNDARY_CROPBOX, rotation, zoom);
        Iterator iter = ImageIO.getImageWritersBySuffix(FILETYPE_JPG);
        ImageWriter writer = (ImageWriter) iter.next();
        File outFile = new File(imagepath + document.getNumberOfPages() + "." + FILETYPE_JPG);
        FileOutputStream out = new FileOutputStream(outFile);
        ImageOutputStream outImage = ImageIO.createImageOutputStream(out);
        writer.setOutput(outImage);
        writer.write(new IIOImage(img, null, null));
    }
}