服务器之家:专注于服务器技术及软件下载分享
分类导航

PHP教程|ASP.NET教程|JAVA教程|ASP教程|编程技术|正则表达式|C/C++|IOS|C#|Swift|Android|JavaScript|易语言|

服务器之家 - 编程语言 - JAVA教程 - Java实现在线预览的示例代码(openOffice实现)

Java实现在线预览的示例代码(openOffice实现)

2021-02-23 11:24yjclsx JAVA教程

本篇文章主要介绍了Java实现在线预览的示例代码(openOffice实现),小编觉得挺不错的,现在分享给大家,也给大家做个参考。一起跟随小编过来看看吧

简介

之前有写了poi实现在线预览的文章,里面也说到了使用openOffice也可以做到,这里就详细介绍一下。

我的实现逻辑有两种:

一、利用jodconverter(基于OpenOffice服务)将文件(.doc、.docx、.xls、.ppt)转化为html格式。

二、利用jodconverter(基于OpenOffice服务)将文件(.doc、.docx、.xls、.ppt)转化为pdf格式。

转换成html格式大家都能理解,这样就可以直接在浏览器上查看了,也就实现了在线预览的功能;转换成pdf格式这点,需要用户安装了Adobe Reader XI,这样你会发现把pdf直接拖到浏览器页面可以直接打开预览,这样也就实现了在线预览的功能。

将文件转化为html格式或者pdf格式

话不多说,直接上代码。

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
package com.pdfPreview.util;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ConnectException;
import java.text.SimpleDateFormat;
import java.util.Date;
 
import com.artofsolving.jodconverter.DocumentConverter;
import com.artofsolving.jodconverter.openoffice.connection.OpenOfficeConnection;
import com.artofsolving.jodconverter.openoffice.connection.SocketOpenOfficeConnection;
import com.artofsolving.jodconverter.openoffice.converter.OpenOfficeDocumentConverter;
/**
 * 利用jodconverter(基于OpenOffice服务)将文件(*.doc、*.docx、*.xls、*.ppt)转化为html格式或者pdf格式,
 * 使用前请检查OpenOffice服务是否已经开启, OpenOffice进程名称:soffice.exe | soffice.bin
 *
 * @author yjclsx
 */
public class Doc2HtmlUtil {
 
  private static Doc2HtmlUtil doc2HtmlUtil;
 
  /**
   * 获取Doc2HtmlUtil实例
   */
  public static synchronized Doc2HtmlUtil getDoc2HtmlUtilInstance() {
    if (doc2HtmlUtil == null) {
      doc2HtmlUtil = new Doc2HtmlUtil();
    }
    return doc2HtmlUtil;
  }
 
  /**
   * 转换文件成html
   *
   * @param fromFileInputStream:
   * @throws IOException
   */
  public String file2Html(InputStream fromFileInputStream, String toFilePath,String type) throws IOException {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
    String timesuffix = sdf.format(date);
    String docFileName = null;
    String htmFileName = null;
    if("doc".equals(type)){
      docFileName = "doc_" + timesuffix + ".doc";
      htmFileName = "doc_" + timesuffix + ".html";
    }else if("docx".equals(type)){
      docFileName = "docx_" + timesuffix + ".docx";
      htmFileName = "docx_" + timesuffix + ".html";
    }else if("xls".equals(type)){
      docFileName = "xls_" + timesuffix + ".xls";
      htmFileName = "xls_" + timesuffix + ".html";
    }else if("ppt".equals(type)){
      docFileName = "ppt_" + timesuffix + ".ppt";
      htmFileName = "ppt_" + timesuffix + ".html";
    }else{
      return null;
    }
 
    File htmlOutputFile = new File(toFilePath + File.separatorChar + htmFileName);
    File docInputFile = new File(toFilePath + File.separatorChar + docFileName);
    if (htmlOutputFile.exists())
      htmlOutputFile.delete();
    htmlOutputFile.createNewFile();
    if (docInputFile.exists())
      docInputFile.delete();
    docInputFile.createNewFile();
    /**
     * 由fromFileInputStream构建输入文件
     */
    try {
      OutputStream os = new FileOutputStream(docInputFile);
      int bytesRead = 0;
      byte[] buffer = new byte[1024 * 8];
      while ((bytesRead = fromFileInputStream.read(buffer)) != -1) {
        os.write(buffer, 0, bytesRead);
      }
 
      os.close();
      fromFileInputStream.close();
    } catch (IOException e) {
    }
 
    OpenOfficeConnection connection = new SocketOpenOfficeConnection(8100);
    try {
      connection.connect();
    } catch (ConnectException e) {
      System.err.println("文件转换出错,请检查OpenOffice服务是否启动。");
    }
    // convert
    DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
    converter.convert(docInputFile, htmlOutputFile);
    connection.disconnect();
    // 转换完之后删除word文件
    docInputFile.delete();
    return htmFileName;
  }
 
  /**
   * 转换文件成pdf
   *
   * @param fromFileInputStream:
   * @throws IOException
   */
  public String file2pdf(InputStream fromFileInputStream, String toFilePath,String type) throws IOException {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
    String timesuffix = sdf.format(date);
    String docFileName = null;
    String htmFileName = null;
    if("doc".equals(type)){
      docFileName = "doc_" + timesuffix + ".doc";
      htmFileName = "doc_" + timesuffix + ".pdf";
    }else if("docx".equals(type)){
      docFileName = "docx_" + timesuffix + ".docx";
      htmFileName = "docx_" + timesuffix + ".pdf";
    }else if("xls".equals(type)){
      docFileName = "xls_" + timesuffix + ".xls";
      htmFileName = "xls_" + timesuffix + ".pdf";
    }else if("ppt".equals(type)){
      docFileName = "ppt_" + timesuffix + ".ppt";
      htmFileName = "ppt_" + timesuffix + ".pdf";
    }else{
      return null;
    }
 
    File htmlOutputFile = new File(toFilePath + File.separatorChar + htmFileName);
    File docInputFile = new File(toFilePath + File.separatorChar + docFileName);
    if (htmlOutputFile.exists())
      htmlOutputFile.delete();
    htmlOutputFile.createNewFile();
    if (docInputFile.exists())
      docInputFile.delete();
    docInputFile.createNewFile();
    /**
     * 由fromFileInputStream构建输入文件
     */
    try {
      OutputStream os = new FileOutputStream(docInputFile);
      int bytesRead = 0;
      byte[] buffer = new byte[1024 * 8];
      while ((bytesRead = fromFileInputStream.read(buffer)) != -1) {
        os.write(buffer, 0, bytesRead);
      }
 
      os.close();
      fromFileInputStream.close();
    } catch (IOException e) {
    }
 
    OpenOfficeConnection connection = new SocketOpenOfficeConnection(8100);
    try {
      connection.connect();
    } catch (ConnectException e) {
      System.err.println("文件转换出错,请检查OpenOffice服务是否启动。");
    }
    // convert
    DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
    converter.convert(docInputFile, htmlOutputFile);
    connection.disconnect();
    // 转换完之后删除word文件
    docInputFile.delete();
    return htmFileName;
  }
 
  public static void main(String[] args) throws IOException {
    Doc2HtmlUtil coc2HtmlUtil = getDoc2HtmlUtilInstance();
    File file = null;
    FileInputStream fileInputStream = null;
 
    file = new File("D:/poi-test/exportExcel.xls");
    fileInputStream = new FileInputStream(file);
//   coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/xls","xls");
    coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/xls","xls");
 
    file = new File("D:/poi-test/test.doc");
    fileInputStream = new FileInputStream(file);
//   coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/doc","doc");
    coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/doc","doc");
 
    file = new File("D:/poi-test/周报模版.ppt");
    fileInputStream = new FileInputStream(file);
//   coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/ppt","ppt");
    coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/ppt","ppt");
 
    file = new File("D:/poi-test/test.docx");
    fileInputStream = new FileInputStream(file);
//   coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/docx","docx");
    coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/docx","docx");
 
  }
 
}

转换成html和转换成pdf的过程几乎一样,只是在创建输出的File时前者命名为XXX.html,后者命名为XXX.pdf,在执行converter.convert(docInputFile, htmlOutputFile);时,jodconverter会自己根据文件类型名转换成对应的文件。

注意,main方法里别file2Html和file2pdf都调用,会报错的,要么转html,要么转pdf,只能选一个。还有就是在执行之前,需要启动openOffice的服务:在openOffice目录下的命令窗口中执行soffice -headless -accept=”socket,host=127.0.0.1,port=8100;urp;” -nofirststartwizard即可启动。

以上需要引入jodconverter的jar包。希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:http://blog.csdn.net/yjclsx/article/details/51445546

延伸 · 阅读

精彩推荐