百木园前言
当前的主浏览器都支持直接打开pdf文件，从而实现文件预览。如果是其他格式文件则得下载，因此用openOffice实现文件转pdf格式。
一、 openOffice的安装
-
下载地址：http://www.openoffice.org/
安装教程可参考：openOffice下载和安装 -
进入安装目录，输入cmd
-
命令窗口输入以下命令启动：
soffice -headless -accept=\"socket,host=127.0.0.1,port=8100;urp;\" –nofirststartwizard
二、测试
- 导包
<!--openoffice-->
<dependency>
<groupId>com.artofsolving</groupId>
<artifactId>jodconverter</artifactId>
<version>2.2.1</version>
</dependency>
- 文件工具类
import com.artofsolving.jodconverter.DefaultDocumentFormatRegistry;
import com.artofsolving.jodconverter.DocumentConverter;
import com.artofsolving.jodconverter.DocumentFormat;
import com.artofsolving.jodconverter.openoffice.connection.OpenOfficeConnection;
import com.artofsolving.jodconverter.openoffice.connection.SocketOpenOfficeConnection;
import com.artofsolving.jodconverter.openoffice.converter.StreamOpenOfficeDocumentConverter;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
/**
* 文件格式转换工具类
*
* @author Simon
* @version 1.0
* @since JDK1.8
*/
public class FileConvertUtil {
/** 默认转换后文件后缀 */
private static final String DEFAULT_SUFFIX = \"pdf\";
/** openoffice_port */
public static final String DEFAULT_HOST = \"127.0.0.1\";
private static final Integer OPENOFFICE_PORT = 8100;
/**
* office文档转换为PDF(处理本地文件)
*/
public static InputStream convertLocaleFile(String sourcePath, String suffix) throws Exception {
File inputFile = new File(sourcePath);
InputStream inputStream = new FileInputStream(inputFile);
return covertCommonByStream(inputStream, suffix);
}
/**
* office文档转换为PDF(处理网络文件)
*/
public static InputStream convertNetFile(String netFileUrl, String suffix) throws Exception {
// 创建URL
URL url = new URL(netFileUrl);
// 试图连接并取得返回状态码
URLConnection urlconn = url.openConnection();
urlconn.connect();
HttpURLConnection httpconn = (HttpURLConnection) urlconn;
int httpResult = httpconn.getResponseCode();
if (httpResult == HttpURLConnection.HTTP_OK) {
InputStream inputStream = urlconn.getInputStream();
return covertCommonByStream(inputStream, suffix);
}
return null;
}
/**
* 将文件以流的形式转换
*/
public static InputStream covertCommonByStream(InputStream inputStream, String suffix) throws Exception {
ByteArrayOutputStream out = new ByteArrayOutputStream();
OpenOfficeConnection connection = new SocketOpenOfficeConnection(OPENOFFICE_PORT);
connection.connect();
DocumentConverter converter = new StreamOpenOfficeDocumentConverter(connection);
DefaultDocumentFormatRegistry formatReg = new DefaultDocumentFormatRegistry();
DocumentFormat targetFormat = formatReg.getFormatByFileExtension(DEFAULT_SUFFIX);
DocumentFormat sourceFormat = formatReg.getFormatByFileExtension(suffix);
converter.convert(inputStream, sourceFormat, out, targetFormat);
connection.disconnect();
return outputStreamConvertInputStream(out);
}
/**
* outputStream转inputStream
*/
public static ByteArrayInputStream outputStreamConvertInputStream(final OutputStream out) throws Exception {
ByteArrayOutputStream baos=(ByteArrayOutputStream) out;
return new ByteArrayInputStream(baos.toByteArray());
}
}
- controler层代码
@PostMapping(\"/onlinePreview\")
public void onlinePreview(@RequestParam(\"url\") String url, HttpServletResponse response) throws Exception {
//获取文件类型 根据实际的url截断
String suffix = url.substring(url.lastIndexOf(\'.\') + 1);
if (!suffix.equals(\"txt\") && !suffix.equals(\"doc\") && !suffix.equals(\"docx\") && !suffix.equals(\"xls\")
&& !suffix.equals(\"xlsx\") && !suffix.equals(\"ppt\") && !suffix.equals(\"pptx\") && !suffix.equals(\"sheet\") && !suffix.equals(\"pdf\")) {
throw new Exception(\"文件格式不支持预览\");
}
//我的文件是存在本地上的，该url是为了别的电脑能访问到，再传到这的时候就是解析本地文件了，所以找到我的本地文件路径
//根据具体情况来，否则会报错
url=url.replace(\"192.168.1.125:8765/knowledge/\",\"G:/creo/knowledge/\");
//处理本地文件
InputStream in = FileConvertUtil.convertLocaleFile(url, suffix);
OutputStream outputStream = response.getOutputStream();
//创建存放文件内容的数组
byte[] buff = new byte[1024];
//所读取的内容使用n来接收
int n;
//当没有读取完时,继续读取,循环
while ((n = in.read(buff)) != -1) {
//将字节数组的数据全部写入到输出流中
outputStream.write(buff, 0, n);
}
//强制将缓存区的数据进行输出
outputStream.flush();
//关流
outputStream.close();
in.close();
}
- 常见异常
java.lang.IllegalArgumentException: inputFormat is null at com.artofsolving.jodconverter.openoffice.converter.AbstractOpenOfficeDocumentConverter.ensureNotNull(AbstractOpenOfficeDocumentConverter.java:113)
这是因为转换07版本及高版本（.docx/.xlsx/.pptx）时，这三种格式不在所支持的文件格式中。
** 解决办法： **
重写BasicDocumentFormatRegistry (一定得在com.artofsolving.jodconverter包下）
package com.artofsolving.jodconverter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class BasicDocumentFormatRegistry implements DocumentFormatRegistry {
private List documentFormats = new ArrayList();
public BasicDocumentFormatRegistry() {
}
public void addDocumentFormat(DocumentFormat documentFormat) {
this.documentFormats.add(documentFormat);
}
protected List getDocumentFormats() {
return this.documentFormats;
}
public DocumentFormat getFormatByFileExtension(String extension) {
if (extension == null) {
return null;
} else {
if (extension.indexOf(\"doc\") >= 0) {
extension = \"doc\";
}
if (extension.indexOf(\"ppt\") >= 0) {
extension = \"ppt\";
}
if (extension.indexOf(\"xls\") >= 0) {
extension = \"xls\";
}
String lowerExtension = extension.toLowerCase();
Iterator it = this.documentFormats.iterator();
DocumentFormat format;
do {
if (!it.hasNext()) {
return null;
}
format = (DocumentFormat)it.next();
} while(!format.getFileExtension().equals(lowerExtension));
return format;
}
}
public DocumentFormat getFormatByMimeType(String mimeType) {
Iterator it = this.documentFormats.iterator();
DocumentFormat format;
do {
if (!it.hasNext()) {
return null;
}
format = (DocumentFormat)it.next();
} while(!format.getMimeType().equals(mimeType));
return format;
}
}
参考：解决jodconverter 2.2.1 版本不支持docx、xlsx、pptx 转换成PDF格式异常
来源：https://www.cnblogs.com/jasmine-e/p/16254454.html
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