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RestPack Java实现Html转PDF文件
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最近公司需要将前端一个图表统计导出为pdf。前端导出显示的pdf还是可以的，但是将会导致页面不可用与卡死状态。所以由后端寻找解决方案。
以下为解决方案调研
https://www.cnblogs.com/IT-study/p/13706690.html
由于自己开发一个公共的导出pdf功能比较费时费力，而且导出过程中也遇到了各种样式问题。考虑再三决定使用第三方导出来解决这个问题。
好处：接入简单给个H5url即可，无需要考虑导出中遇到的写出的样式与排版问题
坏处：无法做到完全自定义。拿restPack举例子 ，导出长图无法自定义宽度，目前导出有1280px宽度，业务需要手机预览宽度只要 A6纸的规格即可。也可能可以通过js、css参数去解决，我没找到对应的方法。
官网：https://restpack.io/
解决思路1.将一个可访问的H5URL转换为Pdf文件2.将Pdf文件写到页面
H5URL转换为Pdf文件 1 @Component
2 public class H5UrlExportPdf {
3
4
5 @Value("${restpack.token}")
6 private String token = "HA5jLSVtSnjl3fmlhPgTg7rPRE4OnywDvh1CrbanXmpBvNqA";
7
8
9 /**
10 * https://restpack.io/html2pdf/docs
11 */
12 public ReturnRestPackPdf exportPdf(RestPackPdfParameters restpackPdfParameters) throws IOException {
13
14
15 ReturnRestPackPdf returnRestPackPdf;
16
17 //请求URL
18 String reqUrl = "https://restpack.io/api/html2pdf/v6/convert";
19 StringBuilder stringBuilder = new StringBuilder();
20
21 //地址需要encode
22 String firstP = "url";
23 stringBuilder.append(firstP).append("=").append(restpackPdfParameters.getUrl());
24
25 Map<String, String> describe = BeanHelper.describe(restpackPdfParameters);
26 describe.forEach((name, val) -> {
27
28 if (!firstP.equalsIgnoreCase(name)) {
29 stringBuilder.append("&").append(name).append("=").append(val);
30 }
31 });
32
33 System.out.println(stringBuilder.toString());
34
35 byte[] postData = stringBuilder.toString().getBytes(StandardCharsets.UTF_8);
36 HttpURLConnection con = null;
37
38 try {
39
40 URL myUrl = new URL(reqUrl);
41 con = (HttpURLConnection) myUrl.openConnection();
42
43 con.setDoOutput(true);
44 con.setRequestMethod("POST");
45 con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
46 con.setRequestProperty("x-access-token", token);
47
48 try (DataOutputStream wr = new DataOutputStream(con.getOutputStream())) {
49 wr.write(postData);
50 }
51
52 StringBuilder content;
53
54 try (BufferedReader in = new BufferedReader(
55 new InputStreamReader(con.getInputStream()))) {
56
57 String line;
58 content = new StringBuilder();
59
60 while ((line = in.readLine()) != null) {
61 content.append(line);
62 content.append(System.lineSeparator());
63 }
64 }
65
66 returnRestPackPdf = JSONObject.parseObject(content.toString(), ReturnRestPackPdf.class);
67
68 } finally {
69 if (con != null) {
70 con.disconnect();
71 }
72 }
73
74 return returnRestPackPdf;
75 }
76
77
78 }
H5URL导出文档入参 1 @Data
2 public class RestPackPdfParameters implements Serializable{
3
4 private static final long serialVersionUID = 1L;
5
6
7 /**
8 * 需要导出文档H5URL
9 * The URL of web page, including the protocol that you want to capture.
10 * Example: http://example.com
11 */
12 private String url;
13
14
15 /**
16 * Return a JSON response with the resulting image's URL instead of the image itself.
17 * Default: false
18 */
19 private Boolean json = true;
20
21
22 /**
23 * Page size for created document
24 *
25 * Default: Full
26 * Pattern: A0 | A1 | A2 | A3 | A4 | A5 | A6 | Legal | Letter | Tabloid | Ledger | Full
27 *
28 * Legal：width 816 多张图片阶段
29 * Letter：width 816 多张图片阶段
30 * Tabloid：width 1056 多张图片阶段
31 * Ledger：width 1632 多张图片阶段
32 * Full：width 1280 一张图片
33 */
34 private String pdf_page="Full";
35
36 public RestPackPdfParameters() {
37 }
38
39 public RestPackPdfParameters(String url) {
40 this.url = url;
41 }
42 }
H5URL导出文档返回参数 1 @Data
2 public class ReturnRestPackPdf implements Serializable{
3
4 private static final long serialVersionUID = 1L;
5
6
7 private Boolean cached;
8 private String content_type;
9 /** pdf文件类型地址 */
10 private String file;
11 private Integer height;
12 private Integer width;
13 /** pdf图片类型地址 */
14 private String image;
15 private String length;
16 private String remote_status;
17 private String run_time;
18 private String url;
19
20 }
将文件写到页面 1 private void downFileHtml(String name, @RequestParam(value = "fileUrl", required = false) String fileUrl, HttpServletResponse response, Boolean useName) {
2 BufferedInputStream bis = null;
3 BufferedOutputStream bos = null;
4 OutputStream output = null;
5 try {
6 log.info("downLoadFileStart:" + fileUrl);
7 response.setContentType("application/octet-stream; charset=UTF-8");
8 if (useName) {
9
10 } else {
11 String ext = fileUrl.substring(fileUrl.lastIndexOf("."));
12 name = name + ext;
13 name = URLDecoder.decode(name, "UTF-8");
14 }
15
16 response.setHeader("Content-Disposition", "attachment;fileName=\"" + new String(name.getBytes("GBK"), "ISO8859-1") + "\"");
17
18 URL url = new URL(fileUrl);
19 bis = new BufferedInputStream(url.openStream());
20 output = response.getOutputStream();
21 bos = new BufferedOutputStream(output);
22 log.info("downLoadFileCopyStream:" + fileUrl);
23 byte[] buff = new byte[2048];
24 int bytesRead;
25 while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
26 log.info("downLoadFileCopyStreamDetail:" + bytesRead);
27 bos.write(buff, 0, bytesRead);
28 }
29 log.info("downLoadFileEnd:" + fileUrl);
30 } catch (Exception e) {
31 log.error("downLoadFileError:" + fileUrl + ":error:" + e.getMessage());
32 e.printStackTrace();
33 } finally {
34 try {
35 if (bos != null) {
36 bos.flush();
37 bos.close();
38 }
39 if (bis != null) {
40 bis.close();
41 }
42 if (output != null) {
43 output.close();
44 }
45 } catch (IOException e) {
46 e.printStackTrace();
47 }
48 }
49 }
使用事项1.url 为转换pdf的页面地址，改地址必须能直接访问(无登录功能)2.pdf_page 有几个页面规格 A0 | A1 | A2 | A3 | A4 | A5 | A6 | Legal | Letter | Tabloid | Ledger | Full 。Full可导出一张长图，但是宽度不可定。其他的规格与A4类似，导出的是多张图片。3.pdf_width 、pdf_height 可自定义页面规格。一旦pdf_page设置，pdf_width pdf_height必须为空。4.一旦付费成功 css、js 可进行调节生成pdf文件产生的样式问题。5.我们需要导出一整张图片，但是一整张图的宽度不可自定义。导出的宽度为1280px,手机上显示只需要800px。目前这个问题还不知道怎么解决
1.将一个可访问的H5URL转换为Pdf文件2.将Pdf文件写到页面
1 @Component
2 public class H5UrlExportPdf {
3
4
5 @Value("${restpack.token}")
6 private String token = "HA5jLSVtSnjl3fmlhPgTg7rPRE4OnywDvh1CrbanXmpBvNqA";
7
8
9 /**
10 * https://restpack.io/html2pdf/docs
11 */
12 public ReturnRestPackPdf exportPdf(RestPackPdfParameters restpackPdfParameters) throws IOException {
13
14
15 ReturnRestPackPdf returnRestPackPdf;
16
17 //请求URL
18 String reqUrl = "https://restpack.io/api/html2pdf/v6/convert";
19 StringBuilder stringBuilder = new StringBuilder();
20
21 //地址需要encode
22 String firstP = "url";
23 stringBuilder.append(firstP).append("=").append(restpackPdfParameters.getUrl());
24
25 Map<String, String> describe = BeanHelper.describe(restpackPdfParameters);
26 describe.forEach((name, val) -> {
27
28 if (!firstP.equalsIgnoreCase(name)) {
29 stringBuilder.append("&").append(name).append("=").append(val);
30 }
31 });
32
33 System.out.println(stringBuilder.toString());
34
35 byte[] postData = stringBuilder.toString().getBytes(StandardCharsets.UTF_8);
36 HttpURLConnection con = null;
37
38 try {
39
40 URL myUrl = new URL(reqUrl);
41 con = (HttpURLConnection) myUrl.openConnection();
42
43 con.setDoOutput(true);
44 con.setRequestMethod("POST");
45 con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
46 con.setRequestProperty("x-access-token", token);
47
48 try (DataOutputStream wr = new DataOutputStream(con.getOutputStream())) {
49 wr.write(postData);
50 }
51
52 StringBuilder content;
53
54 try (BufferedReader in = new BufferedReader(
55 new InputStreamReader(con.getInputStream()))) {
56
57 String line;
58 content = new StringBuilder();
59
60 while ((line = in.readLine()) != null) {
61 content.append(line);
62 content.append(System.lineSeparator());
63 }
64 }
65
66 returnRestPackPdf = JSONObject.parseObject(content.toString(), ReturnRestPackPdf.class);
67
68 } finally {
69 if (con != null) {
70 con.disconnect();
71 }
72 }
73
74 return returnRestPackPdf;
75 }
76
77
78 }
H5URL导出文档入参 1 @Data
2 public class RestPackPdfParameters implements Serializable{
3
4 private static final long serialVersionUID = 1L;
5
6
7 /**
8 * 需要导出文档H5URL
9 * The URL of web page, including the protocol that you want to capture.
10 * Example: http://example.com
11 */
12 private String url;
13
14
15 /**
16 * Return a JSON response with the resulting image's URL instead of the image itself.
17 * Default: false
18 */
19 private Boolean json = true;
20
21
22 /**
23 * Page size for created document
24 *
25 * Default: Full
26 * Pattern: A0 | A1 | A2 | A3 | A4 | A5 | A6 | Legal | Letter | Tabloid | Ledger | Full
27 *
28 * Legal：width 816 多张图片阶段
29 * Letter：width 816 多张图片阶段
30 * Tabloid：width 1056 多张图片阶段
31 * Ledger：width 1632 多张图片阶段
32 * Full：width 1280 一张图片
33 */
34 private String pdf_page="Full";
35
36 public RestPackPdfParameters() {
37 }
38
39 public RestPackPdfParameters(String url) {
40 this.url = url;
41 }
42 }
H5URL导出文档返回参数 1 @Data
2 public class ReturnRestPackPdf implements Serializable{
3
4 private static final long serialVersionUID = 1L;
5
6
7 private Boolean cached;
8 private String content_type;
9 /** pdf文件类型地址 */
10 private String file;
11 private Integer height;
12 private Integer width;
13 /** pdf图片类型地址 */
14 private String image;
15 private String length;
16 private String remote_status;
17 private String run_time;
18 private String url;
19
20 }
将文件写到页面 1 private void downFileHtml(String name, @RequestParam(value = "fileUrl", required = false) String fileUrl, HttpServletResponse response, Boolean useName) {
2 BufferedInputStream bis = null;
3 BufferedOutputStream bos = null;
4 OutputStream output = null;
5 try {
6 log.info("downLoadFileStart:" + fileUrl);
7 response.setContentType("application/octet-stream; charset=UTF-8");
8 if (useName) {
9
10 } else {
11 String ext = fileUrl.substring(fileUrl.lastIndexOf("."));
12 name = name + ext;
13 name = URLDecoder.decode(name, "UTF-8");
14 }
15
16 response.setHeader("Content-Disposition", "attachment;fileName=\"" + new String(name.getBytes("GBK"), "ISO8859-1") + "\"");
17
18 URL url = new URL(fileUrl);
19 bis = new BufferedInputStream(url.openStream());
20 output = response.getOutputStream();
21 bos = new BufferedOutputStream(output);
22 log.info("downLoadFileCopyStream:" + fileUrl);
23 byte[] buff = new byte[2048];
24 int bytesRead;
25 while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
26 log.info("downLoadFileCopyStreamDetail:" + bytesRead);
27 bos.write(buff, 0, bytesRead);
28 }
29 log.info("downLoadFileEnd:" + fileUrl);
30 } catch (Exception e) {
31 log.error("downLoadFileError:" + fileUrl + ":error:" + e.getMessage());
32 e.printStackTrace();
33 } finally {
34 try {
35 if (bos != null) {
36 bos.flush();
37 bos.close();
38 }
39 if (bis != null) {
40 bis.close();
41 }
42 if (output != null) {
43 output.close();
44 }
45 } catch (IOException e) {
46 e.printStackTrace();
47 }
48 }
49 }
使用事项1.url 为转换pdf的页面地址，改地址必须能直接访问(无登录功能)2.pdf_page 有几个页面规格 A0 | A1 | A2 | A3 | A4 | A5 | A6 | Legal | Letter | Tabloid | Ledger | Full 。Full可导出一张长图，但是宽度不可定。其他的规格与A4类似，导出的是多张图片。3.pdf_width 、pdf_height 可自定义页面规格。一旦pdf_page设置，pdf_width pdf_height必须为空。4.一旦付费成功 css、js 可进行调节生成pdf文件产生的样式问题。5.我们需要导出一整张图片，但是一整张图的宽度不可自定义。导出的宽度为1280px,手机上显示只需要800px。目前这个问题还不知道怎么解决
1 @Data
2 public class RestPackPdfParameters implements Serializable{
3
4 private static final long serialVersionUID = 1L;
5
6
7 /**
8 * 需要导出文档H5URL
9 * The URL of web page, including the protocol that you want to capture.
10 * Example: http://example.com
11 */
12 private String url;
13
14
15 /**
16 * Return a JSON response with the resulting image's URL instead of the image itself.
17 * Default: false
18 */
19 private Boolean json = true;
20
21
22 /**
23 * Page size for created document
24 *
25 * Default: Full
26 * Pattern: A0 | A1 | A2 | A3 | A4 | A5 | A6 | Legal | Letter | Tabloid | Ledger | Full
27 *
28 * Legal：width 816 多张图片阶段
29 * Letter：width 816 多张图片阶段
30 * Tabloid：width 1056 多张图片阶段
31 * Ledger：width 1632 多张图片阶段
32 * Full：width 1280 一张图片
33 */
34 private String pdf_page="Full";
35
36 public RestPackPdfParameters() {
37 }
38
39 public RestPackPdfParameters(String url) {
40 this.url = url;
41 }
42 }
1 @Data
2 public class ReturnRestPackPdf implements Serializable{
3
4 private static final long serialVersionUID = 1L;
5
6
7 private Boolean cached;
8 private String content_type;
9 /** pdf文件类型地址 */
10 private String file;
11 private Integer height;
12 private Integer width;
13 /** pdf图片类型地址 */
14 private String image;
15 private String length;
16 private String remote_status;
17 private String run_time;
18 private String url;
19
20 }
将文件写到页面 1 private void downFileHtml(String name, @RequestParam(value = "fileUrl", required = false) String fileUrl, HttpServletResponse response, Boolean useName) {
2 BufferedInputStream bis = null;
3 BufferedOutputStream bos = null;
4 OutputStream output = null;
5 try {
6 log.info("downLoadFileStart:" + fileUrl);
7 response.setContentType("application/octet-stream; charset=UTF-8");
8 if (useName) {
9
10 } else {
11 String ext = fileUrl.substring(fileUrl.lastIndexOf("."));
12 name = name + ext;
13 name = URLDecoder.decode(name, "UTF-8");
14 }
15
16 response.setHeader("Content-Disposition", "attachment;fileName=\"" + new String(name.getBytes("GBK"), "ISO8859-1") + "\"");
17
18 URL url = new URL(fileUrl);
19 bis = new BufferedInputStream(url.openStream());
20 output = response.getOutputStream();
21 bos = new BufferedOutputStream(output);
22 log.info("downLoadFileCopyStream:" + fileUrl);
23 byte[] buff = new byte[2048];
24 int bytesRead;
25 while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
26 log.info("downLoadFileCopyStreamDetail:" + bytesRead);
27 bos.write(buff, 0, bytesRead);
28 }
29 log.info("downLoadFileEnd:" + fileUrl);
30 } catch (Exception e) {
31 log.error("downLoadFileError:" + fileUrl + ":error:" + e.getMessage());
32 e.printStackTrace();
33 } finally {
34 try {
35 if (bos != null) {
36 bos.flush();
37 bos.close();
38 }
39 if (bis != null) {
40 bis.close();
41 }
42 if (output != null) {
43 output.close();
44 }
45 } catch (IOException e) {
46 e.printStackTrace();
47 }
48 }
49 }
使用事项1.url 为转换pdf的页面地址，改地址必须能直接访问(无登录功能)2.pdf_page 有几个页面规格 A0 | A1 | A2 | A3 | A4 | A5 | A6 | Legal | Letter | Tabloid | Ledger | Full 。Full可导出一张长图，但是宽度不可定。其他的规格与A4类似，导出的是多张图片。3.pdf_width 、pdf_height 可自定义页面规格。一旦pdf_page设置，pdf_width pdf_height必须为空。4.一旦付费成功 css、js 可进行调节生成pdf文件产生的样式问题。5.我们需要导出一整张图片，但是一整张图的宽度不可自定义。导出的宽度为1280px,手机上显示只需要800px。目前这个问题还不知道怎么解决
1 private void downFileHtml(String name, @RequestParam(value = "fileUrl", required = false) String fileUrl, HttpServletResponse response, Boolean useName) {
2 BufferedInputStream bis = null;
3 BufferedOutputStream bos = null;
4 OutputStream output = null;
5 try {
6 log.info("downLoadFileStart:" + fileUrl);
7 response.setContentType("application/octet-stream; charset=UTF-8");
8 if (useName) {
9
10 } else {
11 String ext = fileUrl.substring(fileUrl.lastIndexOf("."));
12 name = name + ext;
13 name = URLDecoder.decode(name, "UTF-8");
14 }
15
16 response.setHeader("Content-Disposition", "attachment;fileName=\"" + new String(name.getBytes("GBK"), "ISO8859-1") + "\"");
17
18 URL url = new URL(fileUrl);
19 bis = new BufferedInputStream(url.openStream());
20 output = response.getOutputStream();
21 bos = new BufferedOutputStream(output);
22 log.info("downLoadFileCopyStream:" + fileUrl);
23 byte[] buff = new byte[2048];
24 int bytesRead;
25 while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
26 log.info("downLoadFileCopyStreamDetail:" + bytesRead);
27 bos.write(buff, 0, bytesRead);
28 }
29 log.info("downLoadFileEnd:" + fileUrl);
30 } catch (Exception e) {
31 log.error("downLoadFileError:" + fileUrl + ":error:" + e.getMessage());
32 e.printStackTrace();
33 } finally {
34 try {
35 if (bos != null) {
36 bos.flush();
37 bos.close();
38 }
39 if (bis != null) {
40 bis.close();
41 }
42 if (output != null) {
43 output.close();
44 }
45 } catch (IOException e) {
46 e.printStackTrace();
47 }
48 }
49 }
1.url 为转换pdf的页面地址，改地址必须能直接访问(无登录功能)2.pdf_page 有几个页面规格 A0 | A1 | A2 | A3 | A4 | A5 | A6 | Legal | Letter | Tabloid | Ledger | Full 。Full可导出一张长图，但是宽度不可定。其他的规格与A4类似，导出的是多张图片。3.pdf_width 、pdf_height 可自定义页面规格。一旦pdf_page设置，pdf_width pdf_height必须为空。4.一旦付费成功 css、js 可进行调节生成pdf文件产生的样式问题。5.我们需要导出一整张图片，但是一整张图的宽度不可自定义。导出的宽度为1280px,手机上显示只需要800px。目前这个问题还不知道怎么解决
