首先需要导入所需工具类

<dependency>

<groupId>org.apache.pdfbox</groupId>

<artifactId>fontbox</artifactId>

<version>2.0.1</version>

</dependency>

<dependency>

<groupId>org.apache.pdfbox</groupId>

<artifactId>pdfbox</artifactId>

<version>2.0.1</version>

</dependency>

<dependency>

<groupId>cn.hutool</groupId>

<artifactId>hutool-all</artifactId>

<version>4.1.19</version>

</dependency>

 

1、PDF转图片的方法    for那里看看是几张图片。 几页。根据页数进行转

/***

* PDF文件转PNG图片，全部页数

*

* @param PdfFilePath pdf完整路径

* @param dpi dpi越大转换后越清晰，相对转换速度越慢

* @return

*/

public static String pdf2Image(String PdfFilePath, String dstImgFolder, int dpi) {

File file = new File(PdfFilePath);

PDDocument pdDocument;

try {

String imgPDFPath = file.getParent();

int dot = file.getName().lastIndexOf('.');

String imagePDFName = file.getName().substring(0, dot); // 获取图片文件名

String imgFolderPath = dstImgFolder;

pdDocument = PDDocument.load(file);

PDFRenderer renderer = new PDFRenderer(pdDocument);

/* dpi越大转换后越清晰，相对转换速度越慢 */

StringBuffer imgFilePath = null;

for (int i = 1; i < 2; i++) {

String imgFilePathPrefix = imgFolderPath + File.separator + imagePDFName;

imgFilePath = new StringBuffer();

imgFilePath.append(imgFilePathPrefix);

imgFilePath.append(".png");

File dstFile = new File(imgFilePath.toString());

BufferedImage image = renderer.renderImageWithDPI(i, dpi);

ImageIO.write(image, "png", dstFile);

}

System.out.println("PDF文档转PNG图片成功！");

return imgFilePath.toString();

} catch (IOException e) {

e.printStackTrace();

return null;

}

}

 

2、调用这个方法  生成BASE64数据

String s = wpath + BRCA + "-" + CTNND1_15951 + "-KMplot.pdf";

//转换返回图片地址

String s1 = pdf2Image(s, wpath, 300);

File file = new File(s1);

//把图片转换为BASE64数据

FileInputStream inputFile = new FileInputStream(file);

byte[] buffer = new byte[(int) file.length()];

inputFile.read(buffer);

inputFile.close();

String ss = new BASE64Encoder().encode(buffer);

 

3、使用ajax的方式将图片数据取回。直接设置如IMG标签中

img就是取回的数据

<img id="ImagePic" src="data:image/png;base64,'+img+'" alt="Base64 encoded image" style="width:600px;" />

完整的ajax代码

var index = layer.load();

$.ajax({

type:"post",

dataType:"json",

contentType:'application/json;charset=UTF-8',

url:"getTnImg",

data:JSON.stringify(data),

success:function(resp){

layer.close(index);

var img = resp.img;

var html = '<img id="ImagePic" src="data:image/png;base64,'+img+'" alt="Base64 encoded image" style="width:600px;" />';

layer.open({

type: 1,

skin: 'layui-layer-rim', //加上边框

area: ['50%', '90%'], //宽高

content: html

});

},

error:function(XMLHttpRequest,textStatus,errorThrown) {

console.log(XMLHttpRequest.status);

console.log(XMLHttpRequest.statusText);

}

});