使用代码生成插件工程，脱离eclipse本身的新建工程向导（1）

    第一步，新建一个普通的Java工程。在网上，我找到了网友们的实现，经过测试是能正常使用的。

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();
		}
	}
}