應(yīng)用程序第一次運(yùn)行正常,第二次運(yùn)行后出現(xiàn)以下錯(cuò)誤,重啟之后運(yùn)行第一次沒問題,第二次又出現(xiàn)問題了。請(qǐng)問是什么原因呢?
警告: The web application [jConnect] is still processing a request that has yet to finish. This is very likely to create a memory leak. You can control the time allowed for requests to finish by using the unloadDelay attribute of the standard Context implementation. Stack trace of request processing thread:
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(Unknown Source)
java.net.SocketInputStream.read(Unknown Source)
java.net.SocketInputStream.read(Unknown Source)
org.rosuda.REngine.Rserve.protocol.RTalk.request(RTalk.java:213)
org.rosuda.REngine.Rserve.protocol.RTalk.request(RTalk.java:180)
org.rosuda.REngine.Rserve.protocol.RTalk.request(RTalk.java:250)
org.rosuda.REngine.Rserve.RConnection.eval(RConnection.java:231)
com.main.service.Execute.getRobj(Execute.java:54)
com.main.web.ExecuteR.doGet(ExecuteR.java:41)
com.main.web.ExecuteR.doPost(ExecuteR.java:55)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1539)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1495)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Unknown Source)
下面是我的代碼:
1.servlet類
package com.main.web;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.rosuda.REngine.REXP;
import org.rosuda.REngine.Rserve.RConnection;
import org.rosuda.REngine.Rserve.RserveException;
import com.main.service.Execute;
import com.main.util.Rservel;
/**
* Servlet implementation class ExecuteR
*/
@WebServlet("/ExecuteR")
public class ExecuteR extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public ExecuteR() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String RSentences=request.getParameter("data");//這個(gè)例子必須到頁(yè)面點(diǎn)擊
//System.out.println(RSentences);
Execute wc=new Execute();
REXP xp;
try {
xp = wc.getRobj(RSentences);//獲得R對(duì)象
wc.createPlot(xp,wc);//
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
2.com.main.service.Execute類
package com.main.service;
import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import org.rosuda.REngine.REXP;
import org.rosuda.REngine.Rserve.RConnection;
import com.main.util.Rservel;
public class Execute extends JFrame{
private static final long serialVersionUID=1L;
static Image img;
public static REXP getRobj(String RSentences) throws Exception{
RConnection c=Rservel.getRConnection();
c.setStringEncoding("utf8");//設(shè)置字符編碼
//返回R的版本
REXP Rservesion=c.eval("R.version.string");
System.out.println("12:"+Rservesion.asString());
String [] arr = RSentences.split("\\s+");
for(String RSentence : arr){
System.out.println("done");
}
REXP xp=c.parseAndEval("jpeg('test.jpg',quality=90)");
c.eval("install.packages('RColorBrewer')");
c.eval("library(RColorBrewer)");
c.eval("H <- c(7,12,28,3,41)");
c.eval("colors<-brewer.pal(5,'Set1')");
c.parseAndEval(" barplot(H,rep(1,5),col=colors);dev.off()");
xp=c.parseAndEval("r=readBin('test.jpg','raw',3000*3000);unlink('test.jpg');r");
c.close();
return xp;
}
public void createPlot(REXP xp, JFrame f)throws Exception{
Image image=Toolkit.getDefaultToolkit().createImage(xp.asBytes());
BufferedImage bufferedImage=toBufferedImage(image);
try {
ImageIO.write(bufferedImage, "JPG", new File("./outImg/98.jpg"));
} catch (IOException e) {
e.printStackTrace();
}
}
public BufferedImage toBufferedImage(Image image) {
if (image instanceof BufferedImage) {
return (BufferedImage)image;
}
image = new ImageIcon(image).getImage();
BufferedImage bimage = null;
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
try {
int transparency = Transparency.OPAQUE;
GraphicsDevice gs = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gs.getDefaultConfiguration();
bimage = gc.createCompatibleImage(
image.getWidth(null), image.getHeight(null), transparency);
} catch (HeadlessException e) {
}
if (bimage == null) {
int type = BufferedImage.TYPE_INT_RGB;
bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
}
Graphics g = bimage.createGraphics();
g.drawImage(image, 0, 0, null);
g.dispose();
return bimage;
}
}
北大青鳥APTECH成立于1999年。依托北京大學(xué)優(yōu)質(zhì)雄厚的教育資源和背景,秉承“教育改變生活”的發(fā)展理念,致力于培養(yǎng)中國(guó)IT技能型緊缺人才,是大數(shù)據(jù)專業(yè)的國(guó)家
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