无法找到org.eclipse.swt.widgets.XXX的类文件

Question

我正在使用Eclipse Indigo，并且无法编译一些在Ganymede中以前工作正常的代码。我无法导入以下任何类别：

import org.eclipse.swt.SWT; 
import org.eclipse.swt.custom.CTabFolder; 
import org.eclipse.swt.custom.CTabItem; 
import org.eclipse.swt.layout.GridData; 
import org.eclipse.swt.layout.GridLayout; 
import org.eclipse.swt.widgets.Composite; 

我试图在Eclipse Marketplace中搜索SWT，但找不到该库。另外，我阅读了其他文章，说重建我的项目（我做了），其他人建议下载“JAR”。有谁知道我需要下载哪个JAR？或者如何修复我的构建路径，以便它包含这些SWT库？

类路径（DannyGui应该有两次）：提前

<?xml version="1.0" encoding="UTF-8"?> 
<classpath> 
<classpathentry kind="src" path="com.danny.DannyGui.plugin/src"/> 
<classpathentry exported="true" kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/swtgraphics2d.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/antlr/stringtemplate-3.2.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/antlr/antlr-2.7.7.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/antlr/antlr-3.1.3.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/antlr/antlr-runtime-3.1.3.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/antlr/gunit.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/wrapper-3.1.0.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/antlr-2.7.2.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/avalon-framework-4.1.5.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/backport-util-concurrent.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/idl.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/jacorb.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/logkit-1.2.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JacORB/picocontainer-1.2.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/gnujaxp.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/iText-2.1.3.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/jcommon-1.0.15.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/jfreechart-1.0.12.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/jfreechart-1.0.12-experimental.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/jfreechart-1.0.12-swt.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/junit.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/JFreeChart/servlet.jar"/> 
<classpathentry exported="true" kind="lib" path="C:/DannyGui/DannyGui/com.danny.DannyGui.plugin/third_party_libs/log4j/log4j-1.2.15.jar"/> 
<classpathentry kind="output" path="bin"/> 
</classpath> 

感谢。

Answer 1

发布的.classpath文件不包含任何可以加载SWT类的地方。这个项目不会像任何版本的Eclipse一样构建。

这听起来像你正试图构建为独立的SWT应用程序（而不是说一个Eclipse插件）。独立应用程序需要类路径上的SWT库。您不会在Eclipse Marketplace上查找SWT，因为您并未在寻找扩展Eclipse的插件。您正在寻找您的项目所依赖的图书馆。您将SWT作为一个zip文件下载，您可以从系统中抽取某个地方。该zip包含.jar文件和作为SWT实现一部分的本机库。

与其给你一个直接的链接，我会告诉你如何找到它。开始在Eclipse平台下载网站：

http://download.eclipse.org/eclipse/downloads/

忽略发展的基础之上。查看最新版本。现在，这将是3.7。跟随该链接到构建页面。寻找SWT底部。下载适合您系统的zip文件。解压缩并从项目的类路径中添加对包含的jar的引用。

Answer 2

3.7最新的SWT：http://download.eclipse.org/eclipse/downloads/drops/R-3.7-201106131736/index.php#SWT