eclipse创建一个java工程

转载自:http://blog.csdn.net/tigerliuwu/article/details/5941446

步骤：
1. 创建一个org.eclipse.core.resources.IProject
2. 给该project设置description，也就是生成.project文件
注意：a、JavaCore.NATURE_ID = "org.eclipse.jdt.core.javanature"表示是个java project
b、在将description置入project时，保证project是存在的并且打开中。
3. 将org.eclipse.core.resources.IProject转换为java project
IJavaProject javaProject=JavaCore.create(project);
4. 取得eclipse的jre路径和当前project的路径，设置源代码的存放目录以及*.class文件的存放目录
这块生成的是.classPath文件中的内容
5. 将一个字符串编译为java文件和对应的.class文件

例子:

<pre name="code" class="java">package com.wisoft.magicube.codegenerator.popup.actions; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import org.eclipse.core.resources.ICommand; import org.eclipse.core.resources.IFolder; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.IProjectDescription; import org.eclipse.core.resources.IResource; import org.eclipse.core.resources.IWorkspace; import org.eclipse.core.resources.IWorkspaceRoot; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IPath; import org.eclipse.core.runtime.NullProgressMonitor; import org.eclipse.core.runtime.Path; import org.eclipse.core.runtime.SubProgressMonitor; import org.eclipse.jdt.core.IClasspathEntry; import org.eclipse.jdt.core.IJavaProject; import org.eclipse.jdt.core.IPackageFragment; import org.eclipse.jdt.core.IPackageFragmentRoot; import org.eclipse.jdt.core.JavaCore; import org.eclipse.jdt.core.JavaModelException; import org.eclipse.jdt.ui.PreferenceConstants; import org.eclipse.jface.action.IAction; import org.eclipse.jface.viewers.ISelection; import org.eclipse.ui.IObjectActionDelegate; import org.eclipse.ui.IWorkbenchPart; public class NewJavaProjectAction implements IObjectActionDelegate { public void run(IAction action) { // 获取工作区 IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot(); // ///////////////////////////////////创建新项目/////////////////////////// final IProject project = root.getProject("xyz"); // 设置工程的位置 // 为项目指定存放路径,默认放在当前工作区 IPath projectPath = new Path("g:/myplugIn"); IWorkspace workspace = root.getWorkspace(); final IProjectDescription description = workspace.newProjectDescription(project.getName()); description.setLocation(projectPath); // 设置工程标记,即为java工程 String[] javaNature = description.getNatureIds(); String[] newJavaNature = new String[javaNature.length + 1]; System.arraycopy(javaNature, 0, newJavaNature, 0, javaNature.length); newJavaNature[javaNature.length] = "org.eclipse.jdt.core.javanature"; // 这个标记证明本工程是Java工程 description.setNatureIds(newJavaNature); // ///////////////////////////// try { NullProgressMonitor monitor = new NullProgressMonitor(); project.create(description, monitor); project.open(IResource.BACKGROUND_REFRESH, new SubProgressMonitor(monitor, 1000)); } catch (CoreException e) { e.printStackTrace(); } // 下面代码只在新建向导的情况下才可用 /* * //创建新项目,WorkspaceModifyOperation位于org.eclipse.ui.ide中 * WorkspaceModifyOperation workspaceModifyOperation = new * WorkspaceModifyOperation() { * * @Override protected void execute(IProgressMonitor monitor) throws * CoreException, InvocationTargetException, InterruptedException { try * { monitor.beginTask("", ); project.create(description, monitor); * * if(monitor.isCanceled()){ throw new OperationCanceledException(); } * * project.open(IResource.BACKGROUND_REFRESH, new * SubProgressMonitor(monitor, )); } catch (Exception e) { * e.printStackTrace(); } finally{ monitor.done(); } } }; * //接下来调用IWizard的getContainer().run()方法. */ // 转化成java工程 IJavaProject javaProject = JavaCore.create(project); // //////////////////////////////////添加JRE库//////////////////////////// try { // 获取默认的JRE库 IClasspathEntry[] jreLibrary = PreferenceConstants.getDefaultJRELibrary(); // 获取原来的build path IClasspathEntry[] oldClasspathEntries = javaProject.getRawClasspath(); List list = new ArrayList(); list.addAll(Arrays.asList(jreLibrary)); list.addAll(Arrays.asList(oldClasspathEntries)); javaProject.setRawClasspath(list.toArray(new IClasspathEntry[list.size()]), null); } catch (JavaModelException e) { e.printStackTrace(); } // //////////////////////////////////创建输出路径///////////////////////////// IFolder binFolder = javaProject.getProject().getFolder("bin"); try { binFolder.create(true, true, null); javaProject.setOutputLocation(binFolder.getFullPath(), null); } catch (CoreException e) { e.printStackTrace(); } // /////////////////////////设置Java生成器/////////////////////// try { IProjectDescription description2 = javaProject.getProject().getDescription(); ICommand command = description2.newCommand(); command.setBuilderName("org.eclipse.jdt.core.javabuilder"); description2.setBuildSpec(new ICommand[] { command }); description2.setNatureIds(new String[] { "org.eclipse.jdt.core.javanature" }); javaProject.getProject().setDescription(description2, null); } catch (CoreException e) { e.printStackTrace(); } // /////////////////////////////创建源代码文件夹////////////////////////// // ///////////源文件夹和文件夹相似,只是使用PackageFragmentRoot进行了封装//////// IFolder srcFolder = javaProject.getProject().getFolder("src"); try { srcFolder.create(true, true, null); // this.createFolder(srcFolder); // 创建SourceLibrary IClasspathEntry srcClasspathEntry = JavaCore.newSourceEntry(srcFolder.getFullPath()); // 得到旧的build path IClasspathEntry[] oldClasspathEntries = javaProject.readRawClasspath(); // 添加新的 List list = new ArrayList(); list.addAll(Arrays.asList(oldClasspathEntries)); list.add(srcClasspathEntry); // 原来存在一个与工程名相同的源文件夹,必须先删除 IClasspathEntry temp = JavaCore.newSourceEntry(new Path("/xyz")); if (list.contains(temp)) { list.remove(temp); } System.out.println(list.size()); javaProject.setRawClasspath(list.toArray(new IClasspathEntry[list.size()]), null); } catch (CoreException e) { e.printStackTrace(); } // ///////////////////////////////创建包////////////////////////// // IPackageFragmentRoot packageFragmentRoot = javaProject.getPackageFragmentRoot(javaProject.getResource()); //此处得到的src目录只读 try { // 先找指定的源文件夹所在的IPackageFragmentRoot IPackageFragmentRoot packageFragmentRoot = javaProject.findPackageFragmentRoot(new Path("/xyz/src")); // 根据IPackageFragmentRoot创建IPackageFragment,IPackageFragment就是包了 IPackageFragment packageFragment = packageFragmentRoot.createPackageFragment("com.aptech.plugin", true, null); // //////////////////////////////////创建Java文件//////////////////////// String javaCode = "package com.aptech.plugin;public class HelloWorld{public static void main(String[] args){System.out.println(\"中华人民共和国\");}}"; packageFragment.createCompilationUnit("HelloWorld.java", javaCode, true, new NullProgressMonitor()); } catch (JavaModelException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } public void setActivePart(IAction action, IWorkbenchPart targetPart) { } public void selectionChanged(IAction action, ISelection selection) { } }