以下是servlet的代码：
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import java.io.*;
import java.awt.*;
import java.awt.image.*;
import java.net.URL;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.*;
public class CreateImageServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
response.setContentType("image/jpeg");
/*
* public ServletOutputStream getOutputStream() ：
* 返回一个适合在响应中写入二进制数据的ServletOutputStream类
* public abstract class ServletOutputStream（）：
* 提供一个向客户端发送二进制数据的输出流
*/
createImage(response.getOutputStream());
}
//生成图像的方法
private void createImage(OutputStream out) throws IOException{
BufferedImage bi2 = ImageIO.read(new URL("D:\\Documents and Settings\\My Pictures\\piao.jpg"));
// encode:
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi2);
param.setQuality(1.0f, false);
encoder.setJPEGEncodeParam(param);
try {
encoder.encode(bi2);
}
catch(IOException ioe) {
ioe.printStackTrace();
}
}
}
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以下是报错内容：
Servlet.service() for servlet CreateImageServlet threw exception
java.net.MalformedURLException: unknown protocol: d
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at image_edit.CreateImageServlet.createImage(CreateImageServlet.java:50)
at image_edit.CreateImageServlet.doGet(CreateImageServlet.java:25)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
------解决方案--------------------
http://blogger.org.cn/dispbbs.asp?boardID=2&ID=31881