施用代码生成插件工程，脱离eclipse本身的新建工程向导（1）

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.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;public class CreateProject {	public static void createJavaProject(String projectName) {		// 获取工作区		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();		// 创建新项目		final IProject project = root.getProject(projectName);		// 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("");//自己设置		IWorkspace workspace = root.getWorkspace();		final IProjectDescription description = workspace				.newProjectDescription(project.getName());		description.setLocation(null);		// 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] = JavaCore.NATURE_ID; // 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();		}		// 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((IClasspathEntry[]) 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);			// 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("/"					+ projectName));			if (list.contains(temp)) {				list.remove(temp);			}			javaProject.setRawClasspath((IClasspathEntry[]) 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("/" + projectName							+ "/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();		}	}}