java转pdf（html转为pdf）,解决中文乱码，标签不规范等问题

第一步，下载jar包以及建对应的文件夹。注意pd4ml的jar要选择pro版本。然后建一个pd4fonts.properties

里面对应的字体。

SimSun = simsun.ttf

前面为变量名，后面要对应你下载好的字体。网上都有各种字体下载。相应步骤做完了，做完后的文件夹如图格式都有了！
注意要引入图片中对应的jar下面的三个jar包到项目中去。

以下为从文件读取到数据再作导出功能。

import java.awt.Insets;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.StringReader;
import java.net.MalformedURLException;
import java.security.InvalidParameterException;


import org.zefer.pd4ml.PD4Constants;
import org.zefer.pd4ml.PD4ML;


public class Test {
    protected int topValue = 10;
    protected int leftValue = 20;
    protected int rightValue = 10;
    protected int bottomValue = 10;
    protected int userSpaceWidth = 1300;



    /**
     * @param args
     */
    public static void main(String[] args) {
        try {
            Test jt = new Test();
            //此处填写你的html文件
            String html = readFile("/Users/wangchen/Desktop/370fx2.html", "UTF-8");
            //此处填写你下载的地方
            jt.doConversion2(html, "/Users/wangchen/Desktop/370fx2.pdf");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void doConversion2(String htmlDocument, String outputPath)
            throws InvalidParameterException, MalformedURLException,
            IOException {
        PD4ML pd4ml = new PD4ML();
        pd4ml.enableDebugInfo();
        pd4ml.setHtmlWidth(userSpaceWidth);
        pd4ml.setPageSize(pd4ml.changePageOrientation(PD4Constants.A4));
        pd4ml.setPageInsetsMM(new Insets(topValue, leftValue, bottomValue,
                rightValue));
//此处的classPath注意一定要获取到你放fonts的文件夹。他需要获取到你下载的字体
        String classPath = Test.class.getResource("/")+"fonts";
        pd4ml.useTTF(classPath, true);
        pd4ml.setDefaultTTFs("SimSun", "SimSun", "SimSun");
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        pd4ml.render(new StringReader(htmlDocument), baos);
        baos.close();
        File output = new File(outputPath);
        java.io.FileOutputStream fos = new java.io.FileOutputStream(output);
        fos.write(baos.toByteArray());
        fos.close();
    }

    private final static String readFile(String path, String encoding)
            throws IOException {
        File f = new File(path);
        FileInputStream is = new FileInputStream(f);
        BufferedInputStream bis = new BufferedInputStream(is);
        ByteArrayOutputStream fos = new ByteArrayOutputStream();
        byte buffer[] = new byte[2048];
        int read;
        do {
            read = is.read(buffer, 0, buffer.length);
            if (read > 0) {
                fos.write(buffer, 0, read);
            }
        } while (read > -1);
        fos.close();
        bis.close();
        is.close();
        return fos.toString(encoding);
    }
}

　　

如上你就可以下载将html转为pdf了。任意文本也可以转为pdf，经测试，可用

附件如下：https://pan.baidu.com/s/1wSvBM6Kti4IpI9IlDaycew

以下为浏览器下载pdf的工具类。直接调用红色的方法即可。htmlDocument 为你要导出的数据，response为该次请求的响应体，fileName为下载的名字

package com.ccb.common.utils;


import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.io.*;
import java.security.InvalidParameterException;
import org.zefer.pd4ml.PD4Constants;
import org.zefer.pd4ml.PD4ML;

/**
 * @author caihong
 * @time 2019/1/28
 */
public class PDFUtil {
    private static String PDF_TYPE="application/pdf";

    private static String classpath=PDFUtil.class.getResource("/").getPath();

    protected static int topValue = 10;
    protected static int leftValue = 20;
    protected static int rightValue = 10;
    protected static int bottomValue = 10;
    protected static int userSpaceWidth = 1300;

    public static void pdf4htmlToPdf(String htmlDocument,HttpServletResponse response, String filename)throws InvalidParameterException,
            IOException {
        PD4ML pd4ml = new PD4ML();
        pd4ml.enableDebugInfo();
        pd4ml.setHtmlWidth(userSpaceWidth);
        pd4ml.setPageSize(pd4ml.changePageOrientation(PD4Constants.A4));
        pd4ml.setPageInsetsMM(new Insets(topValue, leftValue, bottomValue,rightValue));
        pd4ml.useTTF(classpath+"fonts", true);
        pd4ml.setDefaultTTFs("SimSun", "SimSun", "SimSun");
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        pd4ml.render(new StringReader(htmlDocument), baos);
        baos.close();
        renderPdf(response,baos.toByteArray(),filename);
    }

    public static void renderPdf(HttpServletResponse response, final byte[] bytes, final String filename) {
        initResponseHeader(response, PDF_TYPE);
        setFileDownloadHeader(response, filename, ".pdf");
        if (null != bytes) {
            try {
                response.getOutputStream().write(bytes);
                response.getOutputStream().flush();
            } catch (IOException e) {
                throw new IllegalArgumentException(e);
            }
        }
    }

    /**
     * 分析并设置contentType与headers.
     */
    private static HttpServletResponse initResponseHeader(HttpServletResponse response, final String contentType, final String... headers) {
        // 分析headers参数
        String encoding = "utf-8";
        boolean noCache = true;
        for (String header : headers) {
            String headerName = StringUtils.substringBefore(header, ":");
            String headerValue = StringUtils.substringAfter(header, ":");
            if (StringUtils.equalsIgnoreCase(headerName, "utf-8")) {
                encoding = headerValue;
            } else if (StringUtils.equalsIgnoreCase(headerName, "no-cache")) {
                noCache = Boolean.parseBoolean(headerValue);
            } else {
                throw new IllegalArgumentException(headerName + "不是一个合法的header类型");
            }
        }
        // 设置headers参数
        String fullContentType = contentType + ";charset=" + encoding;
        response.setContentType(fullContentType);
        if (noCache) {
            // Http 1.0 header
            response.setDateHeader("Expires", 0);
            response.addHeader("Pragma", "no-cache");
            // Http 1.1 header
            response.setHeader("Cache-Control", "no-cache");
        }
        return response;
    }

    /**
     * 设置让浏览器弹出下载对话框的Header.
     * @param
     */
    public static void setFileDownloadHeader(HttpServletResponse response, String fileName, String fileType) {
        try {
            // 中文文件名支持
            String encodedfileName = new String(fileName.getBytes("GBK"), "ISO8859-1");
            response.setHeader("Content-Disposition", "attachment; filename="" + encodedfileName + fileType + """);
        } catch (UnsupportedEncodingException e) {
        }
    }

    private final static String readFile(String path, String encoding)
            throws IOException {
        File f = new File(path);
        FileInputStream is = new FileInputStream(f);
        BufferedInputStream bis = new BufferedInputStream(is);
        java.io.ByteArrayOutputStream fos = new java.io.ByteArrayOutputStream();
        byte buffer[] = new byte[2048];
        int read;
        do {
            read = is.read(buffer, 0, buffer.length);
            if (read > 0) {
                fos.write(buffer, 0, read);
            }
        } while (read > -1);
        fos.close();
        bis.close();
        is.close();
        return fos.toString(encoding);
    }
}

　　

自己完成controller，以及mapping映射后，注意要用get请求

http://localhost:8080/api/img/exportPdf?htmlDocument=12%E7%9A%84%E5%8F%91%E9%A1%BA%E4%B8%B0%E9%98%BF%E6%96%AF%E9%A1%BF%E5%8F%91%E9%80%81%E5%88%B0%E5%8F%91%E9%80%81%E5%A4%A7&fileName=123

便可以下载pdf了