html如何转pdf

百变鹏仔 3个月前 (09-22) #HTML

文章标签 html

本篇文章给大家介绍html转pdf的方式。有一定的参考价值，有需要的朋友可以参考一下，希望对大家有所帮助。

1、准备资源

itext.jar

 www.baidu.com

html2canvas.js

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2、前端代码：

    //进行截图操作，document.querySelector("body") 为要截图的区域     function test() {            html2canvas(document.querySelector("body"), {                onrendered: function (canvas) {                    var dataUrl = canvas.toDataURL(&#39;image/png&#39;);                    var formData = new FormData(); //模拟表单对象                    formData.append("imgData", convertBase64UrlToBlob(dataUrl)); //写入数据                    var xhr = new XMLHttpRequest(); //数据传输方法                    xhr.open("POST", "http://localhost:8080/pdf"); //配置传输方式及地址                    xhr.send(formData);                    xhr.onreadystatechange = function () { //回调函数                    };                }            });        }        //格式化图片base64编码转换为byte文件流        function convertBase64UrlToBlob(urlData){            //去掉url的头，并转换为byte            var bytes=window.atob(urlData.split(&#39;,&#39;)[1]);            //处理异常,将ascii码小于0的转换为大于0            var ab = new ArrayBuffer(bytes.length);            var ia = new Uint8Array(ab);            for (var s = 0;s<bytes.length;s++){                ia[s] = bytes.charCodeAt(s);            }            return new Blob( [ab] , {type : &#39;image/png&#39;});        }                <body onclick="test()">//调用截图方法即可

3、后端代码：

@RequestMapping(value = "/pdf",method = RequestMethod.POST)    public void test(MultipartHttpServletRequest request, HttpServletResponse response) throws IOException {        String filePath = "D:\\blog\\exportPdf2.pdf";        String imagePath = "D:\\blog\\exportImg2.png";        Document document = new Document();        try{            Map getMap = request.getFileMap();            MultipartFile mfile = (MultipartFile) getMap.get("imgData"); //获取数据            InputStream file = mfile.getInputStream();            byte[] fileByte = FileCopyUtils.copyToByteArray(file);            FileImageOutputStream imageOutput = new FileImageOutputStream(new File(imagePath));//打开输入流            imageOutput.write(fileByte, 0, fileByte.length);//生成本地图片文件            imageOutput.close();            PdfWriter.getInstance(document, new FileOutputStream(filePath)); //itextpdf文件            document.open();            document.add(new Paragraph("JUST TEST ..."));            Image image = Image.getInstance(imagePath); //itext-pdf-image            float heigth = image.getHeight();            float width = image.getWidth();            int percent = getPercent2(heigth, width);  //按比例缩小图片            image.setAlignment(Image.MIDDLE);            image.scalePercent(percent+3);            document.add(image);            document.close();        }catch (DocumentException de) {            System.err.println(de.getMessage());        }        catch (Exception e) {            e.printStackTrace();        }    }    private static int getPercent2(float h, float w) {        int p = 0;        float p2 = 0.0f;        p2 = 530 / w * 100;        p = Math.round(p2);        return p;    }

4、包名

import com.itextpdf.text.Document;import com.itextpdf.text.DocumentException;import com.itextpdf.text.Image;import com.itextpdf.text.Paragraph;import com.itextpdf.text.pdf.PdfWriter;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.stereotype.Controller;import org.springframework.util.FileCopyUtils;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.MultipartHttpServletRequest;import javax.imageio.stream.FileImageOutputStream;import javax.servlet.http.HttpServletResponse;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.Map;

5、项目源码地址

https://github.com/zhangjy520/learn_java/tree/master/boot

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