实现pdf文件预览功能：

我会带着你远行 2022-11-21 04:13 409阅读 0赞

实现pdf文件预览功能：

package com.echarts.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.*;
    import java.net.URL;
    
    @RequestMapping
    @Controller
    public class PdfController {
        
        @RequestMapping("/preview1")
        public void er(HttpServletResponse response){
            File file = new File("d:\\1.pdf");
            if (file.exists()){
                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) {
                    System.out.println(e);
                }
    
            }else{
                return;
            }
    
        }
        @ResponseBody
        @RequestMapping("/preview2")
        public void findPdf( HttpServletResponse response) throws IOException {
            response.setContentType("application/pdf");
            FileInputStream in = new FileInputStream(new File("d:\\1.pdf"));
            OutputStream out = response.getOutputStream();
            byte[] b = new byte[512];
            while ((in.read(b))!=-1) {
                out.write(b);
            }
            out.flush();
            in.close();
            out.close();
        }
    
        @ResponseBody
        @RequestMapping("/preview3")
        public void devDoc(HttpServletRequest request, HttpServletResponse response, String storeName) throws Exception {
            request.setCharacterEncoding("UTF-8");
            String ctxPath = request.getSession().getServletContext().getRealPath("");
            String downLoadPath = "d:\\1.pdf";
            response.setContentType("application/pdf");
            FileInputStream in = new FileInputStream(new File(downLoadPath));
            OutputStream out = response.getOutputStream();
            byte[] b = new byte[1024];
            while ((in.read(b))!=-1) {
                out.write(b);
            }
            out.flush();
            in.close();
            out.close();
        }
        @ResponseBody
        @RequestMapping("/preview")
        public void download( HttpServletResponse response
        ) throws IOException {
            String filePath = "d:\\1.pdf";
            System.out.println("filePath:" + filePath);
            File f = new File(filePath);
            if (!f.exists()) {
                response.sendError(404, "File not found!");
                return;
            }
            BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));
            byte[] bs = new byte[1024];
            int len = 0;
            response.reset(); // 非常重要
            if (true) { // 在线打开方式
                URL u = new URL("file:///" + filePath);
                String contentType = u.openConnection().getContentType();
                response.setContentType(contentType);
                response.setHeader("Content-Disposition", "inline;filename="
                        + "2019年上半年英语四级笔试准考证(戴林峰).pdf");
                // 文件名应该编码成utf-8，注意：使用时，我们可忽略这句
            } else {
                // 纯下载方式
                response.setContentType("application/x-msdownload");
                response.setHeader("Content-Disposition", "attachment;filename="
                        + "2019年上半年英语四级笔试准考证(戴林峰).pdf");
            }
            OutputStream out = response.getOutputStream();
            while ((len = br.read(bs)) > 0) {
                out.write(bs, 0, len);
            }
            out.flush();
            out.close();
            br.close();
        }
    
    
    
    }

访问地址：

[http://localhost:8082/preview][http_localhost_8082_preview]

[http_localhost_8082_preview]: http://localhost:8082/preview