javaimage类

① java里Image数据类型怎么传参数给他

传Image对象
获取Image对象方式有很多如以下
Image img = Toolkit.getDefaultToolkit.createImage(String filename);
Image img = Toolkit.getDefaultToolkit.createImage(URL url);
Image img = ImageIO.read(File file);
Image img = ImageIO.read(URL url);

② java中BufferedImage图像有哪几种类型

Java的BufferedImage类是Image类的子类。属于一种类型，它是用来处理和操作的图像数据。

③ java中ImageIcon和Image的区别是什么

ImageIcon和Image的区别：

ImageIcon：

ImageIcon位于javax.swing包中。可以根据Image绘制Icon（这句话很关键），可以使用MediaTracker预载图像（Image也可以）

构造方法不少，举几个常用的：

ImageIcon(Image image);

ImageIcon(String name);

ImageIcon(URL url);

Image：

来自于java.awt包中，抽象类Image是表示图形图像的所有类的超类，必须以特定于平台的方式获取图像。

它的主要方法是：

Image getScaledInstance(int width,int height,int hints)

④ java.awt.Image类的setScaleInstance()方法是怎样定义的，参数是什么

public Image getImage(URL url, String name)

返回能被绘制到屏幕上的 Image 对象。url 参数必须指定绝对 URL。name 参数是相对于 url 参数的说明符。

不管图像存在与否，此方法总是立刻返回。当此 applet 试图在屏幕上绘制图像时，数据将被加载。绘制图像的图形图元将逐渐绘制到屏幕上。

参数：

url - 给出图像基本位置的绝对 URL。

name - 相对于 url 参数的图象位置。

返回：

指定 URL 处的图像。

public abstract boolean drawImage(Image img, int x, int y, ImageObserver observer)

绘制指定图像中当前可用的图像。图像的左上角位于该图形上下文坐标空间的 (x, y)。图像中的透明像素不影响该处已存在的像素。

此方法在任何情况下都立刻返回，甚至在图像尚未完整加载，并且还没有针对当前输出设备完成抖动和转换的情况下也是如此。

如果图像已经完整加载，并且其像素不再发生更改，则 drawImage 返回 true。否则，drawImage 返回 false，并且随着更多的图像可用或者到了绘制动画另一帧的时候，加载图像的进程将通知指定的图像观察者。

⑤ java如何为image类型赋值

image数据类型是sqlserver中用来存贮变长的二进制数据，取值范围在跟int数据类型一样，所以在java中对应的数据类型可以是int，因为是二进制，也可以试试byte[]，具体是int还是byte[]好，我没用过，你可以试试。

⑥ Java：Image和BufferedImage的区别是什么

Image是一个抽象类，BufferedImage是Image的实现类。
Image和BufferedImage的主要作用就是将一副图片加载到内存中。
BufferedImage 子类描述具有可访问图像数据缓冲区的 Image。BufferedImage 由图像数据的 ColorModel 和 Raster 组成。Raster 的 SampleModel 中 band 的数量和类型必须与 ColorModel 所要求的数量和类型相匹配，以表示其颜色和 alpha 分量。所有 BufferedImage 对象的左上角坐标都为 (0, 0)。因此，用来构造 BufferedImage 的任何 Raster 都必须满足：minX=0 且 minY=0。

Java将一副图片加载到内存中的方法是：

String imgPath = "D://demo.bmp";
BufferedImage image = ImageIO.read(new FileInputStream(imgPath));

该方法BufferedImage 可以获得图片的详细信息，例如：获得图片的宽度：image.getWidth(null);图片只有加载内存中才能对图片进行进一步的处理。

⑦ 关于java里image的用法

先要设置图片路径，我们将一将背景图片back.jpg放到C盘的img目录下,调用语句如下：
ImageIcon icon=new ImageIcon("C:\\img\\back.jpg),一定要是双反斜杠
然后分别在JComponent里添加图片
JFrame
利用JFrame的一个方法setIconImage(Image image);
由于要用到Image类，所以还得把上面定义的ImageIcon对象转换成Image对象：
Image image=icon.getImage();
然后就可以调用JFrame的setIconImage(image)方法了。

还要注意一点的是，由于有些图片的格式JVM不能识别，所以要转格式，一般为jpg,gif.如把.bmp格式的转换为.jpg,不能简单的把后缀名改了就行，这样照样不能显示。方法很简单，直接用WINDOWS自带的画图工具打开图片，然后另存为时改为.jpg或.gif格式就可以了。
附源代码
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.JTree;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import java.awt.FlowLayout;

public class ImageTest extends JFrame{
ImageIcon icon=new ImageIcon("c:\\img\\system.jpg");
Image image=icon.getImage();
public ImageTest()
{
JMenuBar mb=new JMenuBar();
this.setJMenuBar(mb);
JMenu menu=new JMenu("system");
menu.setIcon(icon);
//JMenuItem item=new JMenuItem("exit",icon);
JMenuItem item=new JMenuItem(icon);
item.setIcon(icon);
JLabel label=new JLabel(icon);
//label.setIcon(icon);
menu.add(item);
mb.add(menu);

DefaultMutableTreeNode root=new DefaultMutableTreeNode();
DefaultMutableTreeNode node1=new DefaultMutableTreeNode();
DefaultMutableTreeNode node11=new DefaultMutableTreeNode();
DefaultMutableTreeNode node12=new DefaultMutableTreeNode();
DefaultMutableTreeNode node2=new DefaultMutableTreeNode();
DefaultMutableTreeNode node21=new DefaultMutableTreeNode();
root.add(node1);
root.add(node2);
node1.add(node11);
node1.add(node12);
node2.add(node21);

JTree jTree1 = new javax.swing.JTree(root);
DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
renderer.setOpenIcon(new ImageIcon("C:\\img\\down.jpg")); //展开时节点图标
renderer.setClosedIcon(new ImageIcon("C:\\img\\file.jpg")); //折叠时节点图标
renderer.setLeafIcon(new ImageIcon("C:\\img\\man_small.jpg")); //叶子节点图标
jTree1.setCellRenderer(renderer);
this.add(label);
this.setIconImage(image);

this.add(jTree1);
this.setDefaultCloseOperation(3);
this.setLocation(300,400);
this.pack();
this.setVisible(true);
}
public static void main(String[] args)
{
new ImageTest();
}
}

⑧ image类型怎么初始化java

ava image类初始化
java image类初始化,无法初始化类javax.imageio.ImageIO

科普君冷知识
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我试图将一个

spring web应用程序部署到运行在

windows azure上的生产环境中的tomcat 7(尝试过ubuntu和windows datacenter vm).
遗憾的是,我在生成与

ImageIo一起使用的缩略图时检索到错误(下面的堆栈跟踪).
在开发过程中,我也使用了tomcat 7,所以我真的不明白,生产网络服务器有什么不同.

当我尝试通过“ImageIO.scanForPlugins();”加载模块时exakt同样的事情发生了.是不是ImageIO或javax.awt通常包含在标准的java7 jre中？

我想在META-INF / services / javax.io中设置一个子文件夹或者在堆模式下运行jvm,但没有解决下面的问题.我想我现在真的走在墙上,因为我不知道如何解决这个问题.在本地开发环境(Windows 8,Java7 64B,Tomcat7)上,我没有对上面的这些提示做任何事情(堆模式或类文件),并且一切都运行完美.有这样的事情,应用程序是在没有GPU或类似的服务器上运行的吗？

感谢您提前回复=)

HTTP Status 500 - Handler processing failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageIOException report

Handler processing failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageIO

org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageIO

org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:972)

org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)

org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)

javax.servlet.http.HttpServlet.service(HttpServlet.java:646)

javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)

org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.servletapi..doFilter(.java:54)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.authentication..doFilter(.java:183)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.context..doFilter(.java:87)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)

org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)

org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)

java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageIO

ch.yooapps.resman.service.data.FileServiceImpl.createFile(FileServiceImpl.java:63)

sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

java.lang.reflect.Method.invoke(Method.java:606)

org.springframework.aop.support.AopUtils.(AopUtils.java:319)

org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)

org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)

org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)

org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)

org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)

com.sun.proxy.$Proxy171.createFile(Unknown Source)

ch.yooapps.resman.application.controllers.rest.FileController.attacheFile(FileController.java:61)

sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

java.lang.reflect.Method.invoke(Method.java:606)

org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)

org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)

org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)

org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)

org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)

org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)

org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)

org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)

org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)

javax.servlet.http.HttpServlet.service(HttpServlet.java:646)

javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)

org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.servletapi..doFilter(.java:54)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.authentication..doFilter(.java:183)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.context..doFilter(.java:87)

org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)

org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)

org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)

来自Tomcatlog的Stacktrace：

SEVERE: Servlet.service() for servlet [mvc-dispatcher] in context with path [/rp] threw exception [Handler processing failed; nested exception is java.lang.ExceptionInInitializerError] with root cause

java.lang.NullPointerException

at javax.imageio.spi.IIORegistry.getDefaultInstance(IIORegistry.java:155)

at javax.imageio.ImageIO.(ImageIO.java:65)

at ch.yooapps.resman.service.data.FileServiceImpl.createFile(FileServiceImpl.java:63)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.springframework.aop.support.AopUtils.(AopUtils.java:319)

at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)

at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)

at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)

at com.sun.proxy.$Proxy47.createFile(Unknown Source)

at ch.yooapps.resman.application.controllers.rest.FileController.attacheFile(FileController.java:61)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)

at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)

at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)

at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)

at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.servletapi..doFilter(.java:54)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.authentication..doFilter(.java:183)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.context..doFilter(.java:87)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)

at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)

at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)

at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:744)

⑨ 在java的image图片类中画线怎么画

importjava.awt.*;
classMyCanvasextendsCanvas{
publicvoidpaint(Graphicsg){
g.setFont(newFont("华文行楷",Font.PLAIN,20));
g.setColor(Color.RED);
g.drawString("绘图测试!",20,20);
g.drawLine(30,60,100,60);
g.setColor(Color.BLUE);
g.draw3DRect(60,50,70,30,false);
g.setColor(Color.BLUE);
g.fillArc(0,60,65,65,40,80);
g.setFont(newFont("华文彩云",Font.PLAIN,30));
g.setColor(Color.PINK);
g.drawString("彩云之南",20,120);
}
}

publicclassAWTDrawing{
publicstaticvoidmain(Stringargs[]){
Framef=newFrame("AWT绘图");
MyCanvasp=newMyCanvas();
f.add(p);
f.setSize(170,170);
f.setBackground(newColor(160,220,220));
f.setVisible(true);
}
}

效果图（该网站bug315上面还有很多java相关的知识，你可以去学习一下呵呵）：

⑩ java.awt.Image类

public Image getImage(URL url, String name)

返回能被绘制到屏幕上的 Image 对象。url 参数必须指定绝对 URL。name 参数是相对于 url 参数的说明符。
不管图像存在与否，此方法总是立刻返回。当此 applet 试图在屏幕上绘制图像时，数据将被加载。绘制图像的图形图元将逐渐绘制到屏幕上。

参数：
url - 给出图像基本位置的绝对 URL。
name - 相对于 url 参数的图象位置。
返回：
指定 URL 处的图像。
public abstract boolean drawImage(Image img, int x, int y, ImageObserver observer)
绘制指定图像中当前可用的图像。图像的左上角位于该图形上下文坐标空间的 (x, y)。图像中的透明像素不影响该处已存在的像素。
此方法在任何情况下都立刻返回，甚至在图像尚未完整加载，并且还没有针对当前输出设备完成抖动和转换的情况下也是如此。
如果图像已经完整加载，并且其像素不再发生更改，则 drawImage 返回 true。否则，drawImage 返回 false，并且随着更多的图像可用或者到了绘制动画另一帧的时候，加载图像的进程将通知指定的图像观察者。

参数：
img - 要绘制的指定图像。如果 img 为 null，则此方法不执行任何操作。
x - x 坐标。
y - y 坐标。
observer - 转换了更多图像时要通知的对象。
返回：
如果图像像素仍在更改，则返回 false；否则返回 true。