記一次 HTML 模板 轉 PDF

HTM模板的樣式和實際轉pdf樣式會有很是大的差距 獲取模板的方式也是十分曲折...
這裏記錄一下便捷的方式

第一步：

在前端調用windows的打印頁面 這裏的樣式徹底和html一一致；左側 目標打印機 選擇：另存爲PDF
這裏保存的pdf樣式和html的樣式徹底一致。

第二步：
把上一步保存好的pdf轉換爲word 在線轉換地址 pdf2word

第三步：
把上一步保存好的word轉換爲html 在線轉換地址 word2html
得到的模板在稍做調整便可

我是這麼轉換了幾回才獲得了樣式最貼近的模板
若是樣式差距大 能夠本身調整轉換的步驟 省略 or 多轉幾回

jar包中有default.css文件可能會影響樣式

圖片支持http連接 直接像普通的字符串同樣扔進去就能夠

若是樣式難搞 字段很少建議使用 pdf模板轉換 樣式不會改變 缺點：字符長度徹底受域限制 圖片插入太費勁

首先引入依賴

<dependency>
            <groupId>com.itextpdf.tool</groupId>
            <artifactId>xmlworker</artifactId>
            <version>5.5.13</version>
        </dependency>
        <dependency>
            <groupId> com.itextpdf</groupId >
            <artifactId>itextpdf</artifactId >
            <version>5.5.9</version>
        </dependency>

        <dependency>
            <groupId> com.itextpdf</groupId >
            <artifactId>itext-asian</artifactId>
            <version>5.2.0</version>
        </dependency>

如下爲批量導出的代碼 忽略業務代碼

@RequestMapping(value="/exportPrintList")
    public void exportPdf(String keyword, String status, String createStartTime, String createEndTime, HttpServletResponse response)   {

        FileUtil.createDir(pdfFilePath,false);
        
        //業務代碼  查詢須要導出的數據
        AppHealthtestEx ahe = new AppHealthtestEx();
        ahe.setType(HealthTestType.HealthTest.getType());
        ahe.setKeywords(keyword);
        ahe.setCreateStartTime(createStartTime);
        ahe.setCreateEndTime(createEndTime);
        if (StringUtils.isNotBlank(status)) {
            ahe.setStatus(Integer.parseInt(status));
        }
        ahe.setOrgOid(getSearchOrgOid());
        List<AppHealthtestEx> testNumbers = service.findPrintHealthtestEx(ahe);
        int corePoolSize = 5;
        if(testNumbers.size()<corePoolSize){
            corePoolSize = testNumbers.size();
        }

        if(corePoolSize>10){
            corePoolSize = 10;
        }
        // 批量導出 多個任務
        ExecutorService executorService = new ThreadPoolExecutor(corePoolSize, testNumbers.size(), 0L,
                TimeUnit.SECONDS, new ArrayBlockingQueue<>(3));
        List<Future> result = Lists.newArrayList();

        AppPrintMode findPrintMode = new AppPrintMode();
        List<AppPrintMode> appPrintModes = appPrintModeService.find(findPrintMode);

        if(CollectionUtils.isNotEmpty(appPrintModes)){
            findPrintMode = appPrintModes.get(0);
        }

        int printMode = 1;
        if(findPrintMode.getPrintPlateType()!=null){
            printMode = findPrintMode.getPrintPlateType();
        }
        String template = "";
        if(printMode == 1){
            template = templatePath+"PrintAll.html";
        }else{
            template = templatePath +"PrintConcis.html";
        }
        for (AppHealthtestEx ex : testNumbers) {
            result.add(executorService.submit(new         
            PrintThread(pdfFilePath,ex.getTestNumber(),service,template,ex.getName())));
        }
        executorService.shutdown();
        try {
            executorService.awaitTermination(600,TimeUnit.SECONDS);

            FileUtil.compressToZip(pdfFilePath,filePath,"體檢報告導出.zip");
            service.downloadPdf(response,  "體檢報告導出.zip");
        }catch (Exception e){
            log.error("export pdf error ：",e);
        }
    }

線程類：

import com.itextpdf.text.Document;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.tool.xml.XMLWorkerHelper;
import com.itextpdf.tool.xml.html.CssAppliers;
import com.itextpdf.tool.xml.html.CssAppliersImpl;
import com.itextpdf.tool.xml.html.Tags;
import com.itextpdf.tool.xml.pipeline.html.HtmlPipelineContext;
import org.apache.commons.collections.MapUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Map;
import java.util.concurrent.Callable;

public class PrintThread implements Callable{

    public Logger log = LoggerFactory.getLogger(this.getClass());
    private String fileFilePath;

    private String testNumber;

    private String templatePath;

    private AppHealthtestService appHealthtestService;

    private String fileName;

    public PrintThread(String fileFilePath, String testNumber, AppHealthtestService appHealthtestService,String templatePath,String fileName) {
        this.fileFilePath = fileFilePath;
        this.testNumber = testNumber;
        this.appHealthtestService = appHealthtestService;
        this.templatePath = templatePath;
        this.fileName = fileName;
    }

    @Override
    public Object call(){

        FileOutputStream fos = null;
        Document document = null;
        try {
            
            // 獲取全部佔位符對應的值
            Map<String, Object> stringObjectMap = appHealthtestService.exportPreview(testNumber);
            String htmlContent = htmlSetValue(readString(templatePath),stringObjectMap);
            ByteArrayInputStream in = new ByteArrayInputStream(htmlContent.getBytes("UTF-8"));
            document = new Document(PageSize.A4);
            PdfWriter pdfWriter = PdfWriter.getInstance(document, new FileOutputStream(fileFilePath+ fileName+testNumber + ".pdf"));
            document.open();

            document.addTitle("xxx報告");

            // 使用咱們的字體提供器，並將其設置爲unicode字體樣式
            AsianFontProvider fontProvider = new AsianFontProvider();
            fontProvider.addFontSubstitute("lowagie", "garamond");
            // 生產環境是windows  我本地也是windows 若是不加這句 在我本地是沒問題 在服務器上就是亂碼 ... 坑
            fontProvider.setUseUnicode(true);
            CssAppliers cssAppliers = new CssAppliersImpl(fontProvider);
            HtmlPipelineContext htmlContext = new HtmlPipelineContext(cssAppliers);
            htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
            XMLWorkerHelper.getInstance().getDefaultCssResolver(true);

            XMLWorkerHelper.getInstance().parseXHtml(pdfWriter, document, in, null, Charset.forName("UTF-8"),
                    fontProvider);

           // XMLWorkerHelper.getInstance().parseXHtml(pdfWriter, document, in, Charset.forName("UTF-8"),new AsianFontProvider());
            document.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (document != null) {
                document.close();
            }
        }
        return "success";
    }
    
    // 讀html模板代碼
    private static String readString(String filePath) {
        File file = new File(filePath);
        String result = "";
        try {
            FileInputStream in = new FileInputStream(file);
            // size  爲字串的長度 ，這裏一次性讀完
            int size = in.available();
            byte[] buffer = new byte[size];
            in.read(buffer);
            in.close();
            result = new String(buffer,"UTF-8");
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }


   /**
     * 替換掉模板中的佔位符
     * @param html 模板代碼
     * @param map  替換模板的值
     * @return
     */
    private String htmlSetValue(String html,Map<String,Object> map){
        if(StringUtils.isBlank(html) || MapUtils.isEmpty(map)){
            return html;
        }
        for (String key : map.keySet()) {
            html = html.replaceAll("#"+key,MapUtils.getString(map,key,""));
        }
        return html;
    }

字體類：

public class AsianFontProvider extends XMLWorkerFontProvider {

    public AsianFontProvider() {
        super(null,null);
    }

    @Override
    public Font getFont(final String fontname, String encoding, float size, final int style) {
        String fntname = fontname;
        if (fntname == null) {
            fntname = "宋體";
        }
        if (size == 0) {
            size = 4;
        }
        return super.getFont(fntname, encoding, size, style);
    }
}

HTML模板太大 貼一小段 使用 #key 在替換的時候把全部的佔位符替換爲本身想要的值
好比 map中的鍵值對爲： #addres,北京市朝陽區 這樣在html中要顯示地址的地方寫 #address便可：

<td style="vertical-align:bottom; width:20pt">
                <p style="line-height:9pt; margin:0pt"><span style="font-family:'Microsoft YaHei'; font-size:8pt">地</span></p>
            </td>
        <td style="vertical-align:bottom; width:17pt" colspan="6">
                <p style="line-height:7pt; margin:0pt 0pt 0pt 10pt"><span style="font-family:'Microsoft YaHei';   font-size:7pt">址：#address</span></p>
            </td>
        </tr>
        <tr style="height:9pt">
            <td style="vertical-align:bottom; width:20pt">
                <p style="line-height:9pt; margin:0pt"><span style="font-family:'Microsoft YaHei'; font-size:8pt">身</span></p>
            </td>
            <td style="vertical-align:bottom; width:87pt">
                <p style="line-height:9pt; margin:0pt 0pt 0pt 10pt"><span style="font-family:'Microsoft YaHei'; font-size:8pt">高：</span><span
                        style="font-family:'Microsoft YaHei'; font-size:8pt">#heightcm</span></p>
            </td>
            <td style="vertical-align:bottom; width:44pt">
                <p style="line-height:9pt; margin:0pt 0pt 0pt 24pt"><span style="font-family:'Microsoft YaHei'; font-size:8pt">體</span></p>
            </td>
            <td style="vertical-align:bottom; width:102pt">
                <p style="line-height:9pt; margin:0pt 0pt 0pt 9pt"><span style="font-family:'Microsoft YaHei'; font-size:8pt">重：</span><span
                        style="font-family:'Microsoft YaHei'; font-size:8pt">#weightkg</span></p>
            </td>