Eclipse插件开发中获得当前工程目录

1、在普通Java工程下使用以下代码就行：

String currentDir=System.getProperty("user.dir");

2、但是，在插件开发中，以上代码得到的是Eclipse的安装目录，如果想得到我们的代码所在的目录，则需要

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.CodeSource;
import java.security.ProtectionDomain;

public class GetPath {

    public static String getPathFromClass(Class cls) throws IOException {
        String path = null;
        if (cls == null) {
            throw new NullPointerException();
        }
        URL url = getClassLocationURL(cls);
        if (url != null) {
            path = url.getPath();
            if ("jar".equalsIgnoreCase(url.getProtocol())) {
                try {
                    path = new URL(path).getPath();
                } catch (MalformedURLException e) {
                }
                int location = path.indexOf("!/");
                if (location != -1) {
                    path = path.substring(0, location);
                }
            }
            File file = new File(path);
            path = file.getCanonicalPath();
        }
        return path;
    }

    private static URL getClassLocationURL(final Class cls) {
        if (cls == null)
            throw new IllegalArgumentException("null input: cls");
        URL result = null;
        final String clsAsResource = cls.getName().replace('.', '/')
                .concat(".class");
        final ProtectionDomain pd = cls.getProtectionDomain();
        if (pd != null) {
            final CodeSource cs = pd.getCodeSource();
            if (cs != null)
                result = cs.getLocation();
            if (result != null) {
                if ("file".equals(result.getProtocol())) {
                    try {
                        if (result.toExternalForm().endsWith(".jar")
                                || result.toExternalForm().endsWith(".zip"))
                            result = new URL("jar:"
                                    .concat(result.toExternalForm())
                                    .concat("!/").concat(clsAsResource));
                        else if (new File(result.getFile()).isDirectory())
                            result = new URL(result, clsAsResource);
                    } catch (MalformedURLException ignore) {
                    }
                }
            }
        }
        if (result == null) {
            final ClassLoader clsLoader = cls.getClassLoader();
            result = clsLoader != null ? clsLoader.getResource(clsAsResource)
                    : ClassLoader.getSystemResource(clsAsResource);
        }
        return result;
    }
}

以上代码可以得到指定类的绝对地址，如果想得到工程地址，只要把后面的字符串剪掉。

3、下面的代码

String packageName = this.getClass().getResource("").getPath();
packageName = packageName.replace("/", "\\");

可以得到所在类的地址，但是在插件开发中得到的并非是绝对地址。在插件开发中可以结合2和3的代码得到当前工程的绝对地址：

String packageName = this.getClass().getResource("").getPath();
packageName = packageName.replace("/", "\\");
System.out.println("包名："+packageName);
String projectPath = null;
try {
    String packageFullName = GetPath.getPathFromClass(this.getClass());
    projectPath = packageFullName.substring(0,
            packageFullName.indexOf(packageName) + 1);
    System.out.println("工程路径："+projectPath);
} catch (IOException e1) {
    projectPath = null;
    e1.printStackTrace();
}