Servlet高手急救：欲从servlet输出图形，请问linux环境下如何配置，web服务器为tomcat

问题点数：40、回复次数：5Top

1 楼sharetop（九尾灵狐）回复于 2001-09-26 11:47:57 得分 40

 
  这与配置无关的。  
   
  从servlet输出图形就是把它的输出设为image/jpeg，然后在上面draw图形即可。  
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2 楼sharetop（九尾灵狐）回复于 2001-09-26 11:49:13 得分 0

给你一段经典代码吧：  
   
   
  import   java.io.*;    
  import   java.util.*;    
  import   com.sun.image.codec.jpeg.*;    
  import   javax.servlet.*;    
  import   javax.servlet.http.*;    
   
  import   java.awt.*;    
  import   java.awt.image.*;    
   
  public   class   JPEGServlet   extends   HttpServlet   {    
   
  private   Font   mFont=new   Font("隶书",   Font.BOLD,32);    
   
  public   void   doGet(HttpServletRequest   request,HttpServletResponse   response)    
  throws   ServletException,IOException    
  {    
   
  response.setContentType("image/jpeg");    
   
  ServletOutputStream   out=response.getOutputStream();    
   
   
  BufferedImage   image=new   BufferedImage(160,64,BufferedImage.TYPE_INT_RGB);    
   
  Graphics   g=image.getGraphics();    
   
  g.setColor(Color.black);    
  g.fillRect(0,0,160,64);    
  g.setColor(Color.green);    
  g.setFont(mFont);  
   
   
  g.drawString("中国",10,60);    
     
   
  JPEGImageEncoder   encoder=JPEGCodec.createJPEGEncoder(out);    
  encoder.encode(image);    
   
  out.close();    
  }    
   
  public   void   doPost(HttpServletRequest   request,HttpServletResponse   response)    
  throws   ServletException,IOException    
  {    
  doGet(request,response);    
  }  
   
  }    
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3 楼Computer_lover（水中鱼）回复于 2001-09-26 12:14:34 得分 0

执行时报以下错误：  
  Internal   Servlet   Error:  
   
  java.lang.NoClassDefFoundError:   sun/awt/X11GraphicsEnvironment  
  at   java.lang.Class.forName0(Native   Method)  
  at   java.lang.Class.forName(Class.java,   Compiled   Code)  
  at   java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java,   Compiled   Code)  
  at   java.awt.Font.initializeFont(Font.java,   Compiled   Code)  
  at   java.awt.Font.(Font.java,   Compiled   Code)  
  at   JPEGServlet.(JPEGServlet.java,   Compiled   Code)  
  at   java.lang.Class.newInstance0(Native   Method)  
  at   java.lang.Class.newInstance(Class.java,   Compiled   Code)  
  at   org.apache.tomcat.core.ServletWrapper.loadServlet(ServletWrapper.java,   Compiled   Code)  
  at   org.apache.tomcat.core.ServletWrapper.init(ServletWrapper.java,   Compiled   Code)  
  at   org.apache.tomcat.core.Handler.service(Handler.java,   Compiled   Code)  
  at   org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java,   Compiled   Code)  
  at   org.apache.tomcat.core.ContextManager.internalService(ContextManager.java,   Compiled   Code)  
  at   org.apache.tomcat.core.ContextManager.service(ContextManager.java,   Compiled   Code)  
  at   org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java,   Compiled   Code)  
  at   org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java,   Compiled   Code)  
  at   org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java,   Compiled   Code)  
  at   java.lang.Thread.run(Thread.java,   Compiled   Code)  
   
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4 楼Computer_lover（水中鱼）回复于 2001-09-26 12:19:36 得分 0

注意：我的服务器是linuxTop

5 楼sharetop（九尾灵狐）回复于 2001-09-27 12:42:36 得分 0

 
  结分吧，我帮你解决了。  
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