如何在我的项目中使用docx4j？

Question

    log4j:WARN No appenders could be found for logger (org.docx4j.jaxb.Context).
    log4j:WARN Please initialize the log4j system properly.
    log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
    Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/io/IOUtils
at org.docx4j.openpackaging.io3.Load3.get(Load3.java:138)
at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:353)
at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:293)
at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:243)
at org.docx4j.openpackaging.packages.OpcPackage.load(OpcPackage.java:226)
at org.docx4j.openpackaging.packages.WordprocessingMLPackage.load(WordprocessingMLPackage.java:162)
at org.docx4j.Docx4J.load(Docx4J.java:176)
at Doc4JReadDOCX.main(Doc4JReadDOCX.java:11)

Answer 1

您的错误消息试图告诉您需要初始化log4j。通常，您需要告诉它将错误消息打印到控制台或文件中。所以您需要设置一个属性文件，如下所示：

# Root logger option
log4j.rootLogger=DEBUG, stdout

# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

然后，通过读取属性文件创建一个初始化log4j的servlet。类似于这样：

import org.apache.log4j.PropertyConfigurator;
import javax.servlet.http.*;
import com.mysite.*;


public class Log4jInit extends HttpServlet
{
  public void init()
  {
    try{
      String prefix = getServletContext().getRealPath("/");
      String file = getInitParameter("log4j-init-file");
      if(file != null)
      {
        System.out.println("Log4jInit.init - prefix + file: " + prefix + file);
        PropertyConfigurator.configure(prefix + file);        
      }
    }
    catch(Exception e){e.printStackTrace();}
  }

  public void doGet(HttpServletRequest req, HttpServletResponse res){}
}

在web.xml文件中，您需要放置以下内容：

<servlet>
  <servlet-name>log4j-init</servlet-name>
  <servlet-class>com.mysite.Log4jInit</servlet-class>
  <init-param>
    <param-name>log4j-init-file</param-name>
    <param-value>WEB-INF/properties/log4j_CONSOLE.properties</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
  <servlet-name>log4j-init</servlet-name>
  <url-pattern>/log4j-init/*</url-pattern>
</servlet-mapping>