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关于通过PDF.JS显示本地PDF文件和跨域获取文件

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1.去官网下载pdf.js。
其中的view.html不要改，直接放在jsp里。
view.js是渲染pdf，下面的方法需要注意的是路径要对。之前文件流已获得，但是渲染不出来就是因为这里路径不对。

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function configure(PDFJS) {
  PDFJS.imageResourcesPath = path +’resources/ctrl/pdfjs/web/images/’;
  PDFJS.workerSrc = path +’resources/ctrl/pdfjs/build/pdf.worker.js’;
  PDFJS.cMapUrl = path +’resources/ctrl/pdfjs/web/web/cmaps/’;
  PDFJS.cMapPacked = true;
}

2.修改viewer.js
var DEFAULT_URL = ‘compressed.tracemonkey-pldi-09.pdf‘ 里面是PDF的路径删除该变量定义;

3.ajax调用
写在view.js开头

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var path = $(“base”).attr(“href”);
var PDFData = “”;
$.ajax({
    type: “GET”,
    async: false, //
    //dataType: “text”,
    mimeType: ‘text/plain; charset=x-user-defined’,
    url: path+”pdf”,//这里是读取的文件流
    success: function(data) {
        PDFData = data; //data就是byte[]数组，下面有介绍
    }
});
var rawLength = PDFData.length;
//转换成pdf.js能直接解析的Uint8Array类型,见pdf.js-4068  
var array = new Uint8Array(new ArrayBuffer(rawLength));
for (var i = 0;i < rawLength; i++) {
    array[i] = PDFData.charCodeAt(i) & 0xff;
}
DEFAULT_URL = array;

方法一：
1.本地文件流后台处理，只用了web项目，没有任何框架

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public void pdfStreamHandeler(HttpServletRequest request, HttpServletResponse response) {
filePath = “d://a.pdf”;
File file = new File(filePath);
byte[] data = null;
try {
FileInputStream input = new FileInputStream(file);
data = new byte[input.available()];
input.read(data);
response.getOutputStream().write(data);
input.close();
} catch (Exception e) {
logger.error(“pdf文件处理异常：” + e.getMessage());
}
}

方法二：跨域(从云服务器下载）设计知识点（https://www.alibabacloud.com/help/zh/doc-detail/32016.htm?spm=a3c0i.o32014zh.b99.108.e7882928dW9FL）

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@RequestMapping(value = “/pdf”, method = RequestMethod.GET)
@ResponseBody
public byte[] loadPdf1(Model model, HttpServletResponse response, HttpServletRequest request) {
final String keySuffixWithSlash = “a.pdf”;
     // 创建OSSClient实例
     OSSClient Server = new OSSClient(endpoint, accessKeyId, accessKeySecret);
     Date expiration = new Date(new Date().getTime() + 3600 * 1000);
     GeneratePresignedUrlRequest request1 = new
     GeneratePresignedUrlRequest(“aaa”, keySuffixWithSlash,
     HttpMethod.GET);
     // 设置过期时间
     request1.setExpiration(expiration);
     URL signedUrl = Server.generatePresignedUrl(request1);
     String url = signedUrl.toString();
     Server.shutdown();
     System.out.println(“signed url for getObject: “ + signedUrl.toString());
     HttpURLConnection httpConn = null;
     URL urlObj;
     try {
//将url转化成流，把他利用resonse读出，返回页面的是buffBytes
         HttpURLConnHelper HttpURLConnHelper=new HttpURLConnHelper();
         InputStream input=HttpURLConnHelper.loadFileFromURL(url);
         response.setStatus(HttpServletResponse.SC_OK);
         response.setContentType(“application/pdf;charset=UTF-8”);
         ServletOutputStream out =null;
         out = response.getOutputStream();
         int read = 0;
         byte buffBytes[] =new byte[1024];
        while((read = input.read(buffBytes)) != -1) {   
                  out.write(buffBytes, 0, read);   
             } 
        out.flush();   
        out.close();
     } catch (IOException e1) {
         // TODO Auto-generated catch block
         e1.printStackTrace();
     }
     return null;
}

其中HttpURLConnHelper是一个方法类，使用了别人的工具类