2021-10-13

最新推荐文章于 2025-05-20 22:23:34 发布
lostdboy
最新推荐文章于 2025-05-20 22:23:34 发布
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文章标签： java
本文链接：https://blog.youkuaiyun.com/qq_36644198/article/details/120738313
版权
该代码实现了一个用于在线预览和转换不同格式文件的方法，主要处理docx, doc, txt, pdf, png, jpg等文件类型。通过Aspose库将Word文档转换为PDF，再将文件内容编码为Base64格式，以便于在线预览。同时提供了读取和转换文件到Base64的辅助方法。
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流转base64的预览

package com.epoint.yy.auditproject.auditdoc.action;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.UUID;

import org.jboss.resteasy.spi.WriterException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.web.bind.annotation.RestController;

import com.alibaba.fastjson.JSONObject;
import com.aspose.words.Document;
import com.aspose.words.DocumentBuilder;
import com.aspose.words.License;
import com.aspose.words.SaveFormat;
import com.epoint.ahxdocment.api.IAhxDocmentUtil;
import com.epoint.auditproject.auditproject.service.MatrixToImageWriter;
// import com.epoint.auditproject.auditproject.service.MatrixToImageWriter;
import com.epoint.basic.auditproject.auditproject.domain.AuditProject;
import com.epoint.basic.auditproject.auditproject.inter.IAuditProject;
import com.epoint.basic.auditproject.auditprojectdocsnap.domain.AuditProjectDocSnap;
import com.epoint.basic.auditproject.auditprojectdocsnap.inter.IAuditProjectDocSnap;
import com.epoint.basic.auditproject.auditprojectmaterial.domain.AuditProjectMaterial;
import com.epoint.basic.auditproject.auditprojectmaterial.inter.IAuditProjectMaterial;
import com.epoint.basic.auditresource.auditdoctemp.domain.AuditDocTemp;
import com.epoint.basic.auditresource.auditdoctemp.inter.IAuditDocTemp;
import com.epoint.basic.audittask.basic.domain.AuditTask;
import com.epoint.basic.audittask.basic.inter.IAuditTask;
import com.epoint.basic.audittask.material.domain.AuditTaskMaterial;
import com.epoint.basic.audittask.material.inter.IAuditTaskMaterial;
import com.epoint.basic.controller.BaseController;
import com.epoint.common.util.AttachUtil;
import com.epoint.common.util.SqlConditionUtil;
import com.epoint.common.zwfw.authentication.ZwfwUserSession;
import com.epoint.composite.auditsp.handlematerial.inter.IHandleMaterial;
import com.epoint.core.grammar.Record;
import com.epoint.core.utils.classpath.ClassPathUtil;
import com.epoint.core.utils.date.EpointDateUtil;
import com.epoint.core.utils.file.FileManagerUtil;
import com.epoint.core.utils.string.StringUtil;
import com.epoint.frame.service.attach.api.IAttachService;
import com.epoint.frame.service.attach.entity.FrameAttachInfo;
import com.epoint.frame.service.attach.entity.FrameAttachStorage;
import com.epoint.frame.service.metadata.code.api.ICodeItemsService;
import com.epoint.wenshu.api.IProjectWenshuService;
import com.epoint.yy.auditproject.inter.IReceiveArtileList;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import sun.misc.BASE64Encoder;

/**
 * 办件预览
 * 
 * @作者 刘荣
 */
@RestController("attachonlineviewaction")
@Scope("request")
public class AttachOnlineViewAction extends BaseController
{

    
    @Autowired
    private IAttachService iAttachService;
    
    private ByteArrayOutputStream baos;
    
    private String pngbase64 = "data:image/png;base64,";
    
    private String pdfbase64 = "data:application/pdf;base64,";
    
    @Override
    public void pageLoad() {
        String attachGuid = getRequestParameter("attachGuid");
        FrameAttachInfo frameAttachInfo = iAttachService.getAttachInfoDetail(attachGuid);
        String pdfToBase64 = "";
        InputStream inputStreamByInfo = iAttachService.getInputStreamByInfo(frameAttachInfo);
        String contentType = frameAttachInfo.getContentType();
        if(".docx".equalsIgnoreCase(contentType) || ".doc".equalsIgnoreCase(contentType) || ".txt".equalsIgnoreCase(contentType)) {
            try {
                Document document = new Document(inputStreamByInfo);
                ByteArrayOutputStream pdfoutputStream = new ByteArrayOutputStream();
                document.save(pdfoutputStream, SaveFormat.PDF);// 保存成pdf
                pdfToBase64 = PDFToBase64(pdfoutputStream);
            }
            catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            addCallbackParam("url", pdfbase64+pdfToBase64);
        }else {
            try {
                ByteArrayOutputStream reader = Reader(inputStreamByInfo);
                pdfToBase64 = PDFToBase64(reader);
            }
            catch (Exception e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            if(".pdf".equalsIgnoreCase(contentType)) {
                addCallbackParam("url", pdfbase64+pdfToBase64);
            }
            if(".png".equalsIgnoreCase(contentType) || ".jpg".equalsIgnoreCase(contentType) || ".gif".equalsIgnoreCase(contentType) || ".bmp".equalsIgnoreCase(contentType) || ".jpeg".equalsIgnoreCase(contentType)) {
                addCallbackParam("url", pngbase64+pdfToBase64);
            }
        }
        
    }
    
    public ByteArrayOutputStream Reader(InputStream input) throws Exception {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len;
        try {
            while ((len = input.read(buffer)) > -1) {
                baos.write(buffer, 0, len);
            }
            baos.flush();
        } catch (IOException e) {
            throw new Exception("Illegal flow.");
        } finally {
            try {
                input.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return this.baos = baos;
}


    
    public static String PDFToBase64(ByteArrayOutputStream pdfoutputStream) {
        BASE64Encoder encoder = new BASE64Encoder();
        //FileInputStream fin =null;
        //BufferedInputStream bin =null;
        ByteArrayOutputStream baos = null;
        BufferedOutputStream bout =null;
        try {
            //fin = new FileInputStream(file);
            //bin = new BufferedInputStream(fin);
            baos = pdfoutputStream;
            bout = new BufferedOutputStream(baos);
//            byte[] buffer = new byte[1024];
//            int len = bin.read(buffer);
//            while(len != -1){
//                bout.write(buffer, 0, len);
//                len = bin.read(buffer);
//            }
            //刷新此输出流并强制写出所有缓冲的输出字节
            bout.flush();
            byte[] bytes = baos.toByteArray();
            return encoder.encodeBuffer(bytes).trim();  

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            try {
//                fin.close();
//                bin.close();
                bout.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
    
    
    public static void pdfdown(String filePath,byte[] bytes){
        BufferedInputStream bis = null;
        FileOutputStream fos = null;
        BufferedOutputStream bos = null;

        try {
            ByteArrayInputStream byteInputStream = new ByteArrayInputStream(bytes);
            bis = new BufferedInputStream(byteInputStream);
            File file = new File(filePath);
            File path = file.getParentFile();
            if(!path.exists()){
                path.mkdirs();
            }
            fos = new FileOutputStream(file);
            bos = new BufferedOutputStream(fos);

            byte[] buffer = new byte[1024];
            int length = bis.read(buffer);
            while(length != -1){
                bos.write(buffer, 0, length);
                length = bis.read(buffer);
            }
            bos.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                if (bis != null) {
                    bis.close();
                }
                if (fos != null) {
                    fos.close();
                }
                if (bos != null) {
                    bos.close();
                }
            }
            catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}