DocumentBuilder从绝对路径解析文件

Question

我有一个带有JFileChooser的基本Java-UI。

我尝试解析本守则所选择的文件：

Document document = builder.parse(getClass().getResourceAsStream(<SELECTED_PATH>)); 

可悲的是我得到的输出：

java.lang.IllegalArgumentException: InputStream cannot be null 
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:120) 
at wordpress2myblog.WordpressBlog.importWP(WordpressBlog.java:59) 
at wordpress2myblog.WPImportUI.jButton1MouseClicked(WPImportUI.java:165) 
at wordpress2myblog.WPImportUI.access$000(WPImportUI.java:16) 
at wordpress2myblog.WPImportUI$1.mouseClicked(WPImportUI.java:51) 
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253) 
at java.awt.Component.processMouseEvent(Component.java:6385) 
at javax.swing.JComponent.processMouseEvent(JComponent.java:3275) 
at java.awt.Component.processEvent(Component.java:6147) 
at java.awt.Container.processEvent(Container.java:2083) 
at java.awt.Component.dispatchEventImpl(Component.java:4744) 
at java.awt.Container.dispatchEventImpl(Container.java:2141) 
at java.awt.Component.dispatchEvent(Component.java:4572) 
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4619) 
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4289) 
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4210) 
at java.awt.Container.dispatchEventImpl(Container.java:2127) 
at java.awt.Window.dispatchEventImpl(Window.java:2489) 
at java.awt.Component.dispatchEvent(Component.java:4572) 
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:710) 
at java.awt.EventQueue.access$400(EventQueue.java:82) 
at java.awt.EventQueue$2.run(EventQueue.java:669) 
at java.awt.EventQueue$2.run(EventQueue.java:667) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) 
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) 
at java.awt.EventQueue$3.run(EventQueue.java:683) 
at java.awt.EventQueue$3.run(EventQueue.java:681) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) 
at java.awt.EventQueue.dispatchEvent(EventQueue.java:680) 
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296) 
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211) 
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:205) 
at java.awt.Dialog$1.run(Dialog.java:1049) 
at java.awt.Dialog$3.run(Dialog.java:1101) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.awt.Dialog.show(Dialog.java:1099) 
at java.awt.Component.show(Component.java:1591) 
at java.awt.Component.setVisible(Component.java:1543) 
at java.awt.Window.setVisible(Window.java:843) 
at java.awt.Dialog.setVisible(Dialog.java:984) 
at wordpress2myblog.WPImportUI$3.run(WPImportUI.java:222) 
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) 
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:708) 
at java.awt.EventQueue.access$400(EventQueue.java:82) 
at java.awt.EventQueue$2.run(EventQueue.java:669) 
at java.awt.EventQueue$2.run(EventQueue.java:667) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) 
at java.awt.EventQueue.dispatchEvent(EventQueue.java:678) 
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296) 
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211) 
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201) 
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196) 
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188) 
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) 

，如果我尝试解析文件有硬编码相对路径的代码作品精细。但随着文件选择器的路径，这些错误杀死了我的程序。

Answer 1

使用JFileChooser中的方法getSelectedFile（）并使用返回的File创建InputStream。

JFileChooser chooser = new JFileChooser(); 
File file = chooser.getSelectedFile(); 
InputStream inputStream = new FileInputStream(file); 
Document document = builder.parse(inputStream);