JAVA截屏

如题！

Desktop.getDesktop().browse(new URI("http://www.people.com.cn/"));
Robot robot = new Robot();
robot.delay(3000);


Dimension d = new Dimension(Toolkit.getDefaultToolkit().getScreenSize());


int width = (int) d.getWidth();
int height = (int) d.getHeight();


// 最大化浏览器
robot.keyRelease(KeyEvent.VK_F11);
robot.delay(2000);
Image image = robot.createScreenCapture(new Rectangle(0, 60, width, height - 100));


BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics graphics = bi.createGraphics();


graphics.drawImage(image, 0, 0, width, height, null);


// 保存图片
ImageIO.write(bi, "jpg", new File("d:/abc.jpg"));
System.out.println("success");

但是只能在windows环境下进行，linux服务器环境下报错

No X11 DISPLAY variable was set, but this program performed an operation which requires it.
7BECkNzJ java.awt.HeadlessException: 
No X11 DISPLAY variable was set, but this program performed an operation which requires it.

7BECkNzJ        at java.awt.Desktop.getDesktop(Desktop.java:124) ~[na:1.6.0_20]
7BECkNzJ        at com.panguso.op.data.manager.controller.system.garbageWord.GarbageWordManagementController.captureScreen(GarbageWordManagementController.java:374) ~[GarbageWordManagementController.class:na]
7BECkNzJ        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.0_20]
7BECkNzJ        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[na:1.6.0_20]
7BECkNzJ        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[na:1.6.0_20]
7BECkNzJ        at java.lang.reflect.Method.invoke(Method.java:597) ~[na:1.6.0_20]
7BECkNzJ        at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219) ~[spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) ~[spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:100) ~[spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:604) ~[spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:565) ~[spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) ~[spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923) [spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) [spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) [spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) [spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) [servlet-api.jar:na]
7BECkNzJ        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) [servlet-api.jar:na]
7BECkNzJ        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.26]
7BECkNzJ        at com.panguso.op.data.manager.init.LoginFilter.doFilter(LoginFilter.java:81) [LoginFilter.class:na]
7BECkNzJ        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.26]
7BECkNzJ        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
7BECkNzJ        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) [catalina.jar:7.0.26]
7BECkNzJ        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) [tomcat-coyote.jar:7.0.26]
7BECkNzJ        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579) [tomcat-coyote.jar:7.0.26]
7BECkNzJ        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1600) [tomcat-coyote.jar:7.0.26]
7BECkNzJ        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [na:1.6.0_20]
7BECkNzJ        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [na:1.6.0_20]
7BECkNzJ        at java.lang.Thread.run(Thread.java:619) [na:1.6.0_20]