前言
源于一个项目的需求，用户上传Word文件后要能及时在网页上查看文件内容，类似于QQ邮箱的附件查看，QQ邮箱使用的是永中的产品工具。自己做当然是首选不要钱自己写代码就能搞定的。网上搜索后找到了Jacob，下面记录一下使用过程和自己使用中的一些心得。
环境
在项目中引入jacob.jar。复制jacob-1.16.1-x86.dll到jdk\bin目录，放置dll的位置网上有两种说法，一种是jdk\bin另一种是system32。其实只要放在path目录下即可，java中查看path目录的方式：System.getProperty("java.library.path")。另外切勿修改dll的文件名称，因为jacob.jar中已经写好了dll的名称，改了dll的名称后调用时就找不到了。下载的Jacob里面一般会包含x86和x64两个dll，使用哪一个是与jdk的版本相关的，与操作系统版本无关。
代码
常规方式
//word文件路径及名称
String docPath = "D:\\download\\word\\1.docx";
//html文件路径及名称
String fileName = "D:\\download\\html\\1.html";
//创建Word对象，启动WINWORD.exe进程
ActiveXComponent app = new ActiveXComponent("Word.Application");
//设置用后台隐藏方式打开
app.setProperty("Visible", new Variant(false));
//获取操作word的document调用
Dispatch documents = app.getProperty("Documents").toDispatch();
//调用打开命令，同时传入word路径
Dispatch doc = Dispatch.call(documents, "Open", docPath).toDispatch();
//调用另外为命令，同时传入html的路径
Dispatch.invoke(doc, "SaveAs", Dispatch.Method,
new Object[] { fileName, new Variant(8) }, new int[1]);
//关闭document对象
Dispatch.call(doc, "Close", new Variant(0));
//关闭WINWORD.exe进程
Dispatch.call(app, "Quit");
//清空对象
doc = null;
app = null;如果word文件包含图片，那么会生成与html同名的1.files文件夹。这与在IE浏览器中使用右键另存为网页一样。
以上方式在每次调用时系统会创建WINWORD.exe进程，然后再关闭。要知道系统创建进程是非常耗资源的，时间和CPU。我做了一个简单的测试，将1.docx文件复制了30份，循环调用30次，用时76秒。
long start = System.currentTimeMillis();
JacobUtil jacobUtil = new JacobUtil();
for (int i = 1; i <= 30; i++) {
<span style="white-space:pre"> </span>jacobUtil.wordConvert("D:\\download\\word\\"+i+".docx",
"D:\\download\\html\\"+i+".html");
}
long end = System.currentTimeMillis();
System.out.println("用时："+(end-start)/1000L+"秒");
单例方式
import com.jacob.activeX.ActiveXComponent;
import com.jacob.com.Dispatch;
import com.jacob.com.Variant;
public class JacobUtil {
private static ActiveXComponent app;
/**
* 单例模式
*/
public static ActiveXComponent getWordInstance(){
if (app == null) {
app = new ActiveXComponent("Word.Application");
app.setProperty("Visible", new Variant(false));
}
return app;
}
/**
* 转换word
*/
public static void wordConvertSingleton(String docPath, String fileName) {
try {
app = getWordInstance();
Dispatch documents = app.getProperty("Documents").toDispatch();
Dispatch doc = Dispatch.call(documents, "Open", docPath).toDispatch();
Dispatch.invoke(doc, "SaveAs", Dispatch.Method,
new Object[] { fileName, new Variant(8) }, new int[1]);
Dispatch.call(doc, "Close", new Variant(0));
//没有调用Quit命令
doc = null;
} catch (Exception e) {
e.printStackTrace();
}
}
}
long start = System.currentTimeMillis();
for (int i = 1; i <= 30; i++) {
<span style="white-space:pre"> </span>JacobUtil.wordConvertSingleton("D:\\download\\word\\"+i+".docx",
"D:\\download\\html\\"+i+".html");
}
long end = System.currentTimeMillis();
System.out.println("单例用时："+(end-start)/1000L+"秒");
多线程方式
import com.jacob.activeX.ActiveXComponent;
import com.jacob.com.Dispatch;
import com.jacob.com.Variant;
public class ThreadConvert implements Runnable{
private ActiveXComponent app;
private String docPath;
private String fileName;
public ThreadConvert(ActiveXComponent app,String docPath, String fileName) {
this.app = app;
this.docPath = docPath;
this.fileName = fileName;
}
public void run() {
System.out.println("开始："+System.currentTimeMillis());
try {
app.setProperty("Visible", new Variant(false));
Dispatch documents = app.getProperty("Documents").toDispatch();
Dispatch doc = Dispatch.call(documents, "Open", docPath).toDispatch();
Dispatch.invoke(doc, "SaveAs", Dispatch.Method,
new Object[] { fileName, new Variant(8) }, new int[1]);
Dispatch.call(doc, "Close", new Variant(0));
doc = null;
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("结束："+System.currentTimeMillis());
}
}ActiveXComponent app1 = new ActiveXComponent("Word.Application");
for (int i = 1; i <= 30; i++) {
Thread thread = new Thread(
new ThreadConvert(app1,"D:\\download\\word\\"+i+".docx",
"D:\\download\\html\\"+i+".html"));
thread.start();
}多进程方式
ActiveXComponent app1 = new ActiveXComponent("Word.Application");
ActiveXComponent app2 = new ActiveXComponent("Word.Application");
ActiveXComponent app3 = new ActiveXComponent("Word.Application");
for (int i = 1; i <= 30; i++) {
<span style="white-space:pre"> </span>if (i<=10) {
Thread thread = new Thread(new ThreadConvert(app1,"D:\\download\\word\\"+i+".docx",
"D:\\download\\html\\"+i+".html"));
thread.start();
}else if(i <= 20){
Thread thread = new Thread(new ThreadConvert(app2,"D:\\download\\word\\"+i+".docx",
"D:\\download\\html\\"+i+".html"));
thread.start();
}else {
Thread thread = new Thread(new ThreadConvert(app3,"D:\\download\\word\\"+i+".docx",
"D:\\download\\html\\"+i+".html"));
thread.start();
}
}