myeclipse转eclipse jee的工程文件补丁（主要是maven补丁）

以下是用来将myeclipse（或者其他没有加maven配置的工程）的工程文件装换到最新的m2eclipse插件所能识别的格式，

简单来说就是修改.project和.classpath

使用方法：

1. 在workspace任意层级下（当然啦，这个workspace的名字要包含"workspace"字样），运行: java EclipseM2Patch

2. 在任意目录下指定workspace目录，运行: java EclipseM2Patch /java/workspace

运行后将会对workspace下的所有需要patch工程文件进行patch，如果不满意还可以回滚，满意就删除所有备份文件。

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class EclipseM2Patch {

    private static String fileToString(File f) throws Exception {
        byte[] bytes = fileToBytes(f);
        if (bytes.length == 0)
            return null;
        return new String(bytes, "iso-8859-1");
    }

    private static byte[] fileToBytes(File f) throws Exception {
        if (!f.exists())
            return null;
        FileInputStream fis = null;
        byte[] all = new byte[0];
        try {
            byte[] buf = new byte[1024];
            fis = new FileInputStream(f);
            int read = -1;
            while ((read = fis.read(buf)) != -1) {
                byte[] tmp = new byte[all.length + read];
                if (all.length > 0)
                    System.arraycopy(all, 0, tmp, 0, all.length);
                System.arraycopy(buf, 0, tmp, all.length, read);
                all = tmp;
            }
        } finally {
            if (fis != null)
                fis.close();
        }
        return all;
    }

    private static void write(File f, String content) throws Exception {
        FileOutputStream fos = new FileOutputStream(f);
        try {
            fos.write(content.getBytes("iso-8859-1"));
        } finally {
            fos.close();
        }
    }

    private static File backup(File f) throws Exception {
        byte[] bytes = fileToBytes(f);
        if (bytes.length > 0) {
            File backupfile = new File(f.getAbsoluteFile() + ".patchbackup");
            FileOutputStream fos = new FileOutputStream(backupfile);
            try {
                fos.write(bytes);
            } finally {
                fos.close();
            }
            return backupfile;
        }
        return null;
    }

    public static void main(String[] args) throws Exception {
        String workspacepath = args.length == 0 ? null : args[0];
        if (workspacepath == null) {
            File file = new File(".");
            String p = file.getAbsolutePath().replaceAll("(?i)(workspace[^\\\\/]+).*", "$1");
            if (p.length() != file.getAbsolutePath().length()) {
                workspacepath = p;
            }
        }
        if (workspacepath == null) {
            throw new IllegalAccessException();
        }
        ArrayList<File> backups = new ArrayList<File>();
        File workspace = new File(workspacepath);
        for (File projectBaseDir : workspace.listFiles()) {
            if (projectBaseDir.isDirectory()
                    && projectBaseDir.getName().matches("^\\p{Alpha}[\\p{Alpha}_-]+$")) {
                File _project = new File(projectBaseDir, ".project");
                File _classpath = new File(projectBaseDir, ".classpath");
                if (_project.exists()) {
                    String content = fileToString(_project);
                    String addToContent = "<nature>org.eclipse.m2e.core.maven2Nature</nature>";
                    if (!content.contains(addToContent)) {
                        File backupfile = backup(_project);
                        if (backupfile != null)
                            backups.add(backupfile);
                        content = content.replaceAll("(?im)(\\s+)(?=</natures>)", "$1\t" + addToContent
                                + "$1");
                        write(_project, content);
                        System.out.println("file:" + _project + " - patched");
                    } else {
                        File backupfile = new File(_project.getAbsoluteFile() + ".patchbackup");
                        if (backupfile.exists()) {
                            backups.add(backupfile);
                        }
                    }
                }
                if (_classpath.exists()) {
                    String content = fileToString(_classpath);
                    String addToContent = "<classpathentry kind=\"con\" path=\"org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER\"/>";
                    if (!content.contains("org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER")) {
                        File backupfile = backup(_classpath);
                        if (backupfile != null)
                            backups.add(backupfile);
                        content = content.replaceAll("(?im)(\\s+)(?=</classpath>)", "$1\t" + addToContent
                                + "$1");
                        write(_classpath, content);
                        System.out.println("file:" + _classpath + " - patched");
                    } else {
                        File backupfile = new File(_classpath.getAbsoluteFile() + ".patchbackup");
                        if (backupfile.exists()) {
                            backups.add(backupfile);
                        }
                    }
                }
            }
        }
        BufferedReader rd = new BufferedReader(new InputStreamReader(System.in));
        String line = null;
        if (backups.size() > 0) {
            System.out.println(">Delete all backups?(Y-yes/N-no/R-rollback)");
            line = rd.readLine();
            for (File f : backups) {
                if ("y".equalsIgnoreCase(line)) {
                    boolean delete = f.delete();
                    System.out.println("Delete file:" + f + " - " + (delete ? "ok" : "fail"));
                } else if ("r".equalsIgnoreCase(line)) {
                    File file = new File(f.getAbsolutePath().replace(".patchbackup", ""));
                    boolean result = file.delete();
                    if (result)
                        result = f.renameTo(file);
                    System.out.println("Rollback file:" + f + " - " + (result ? "ok" : "fail"));
                }
            }
        }
        System.out.println(">Press any key to continue...");
        line = rd.readLine();
        rd.close();
    }
}
转载地址：http://floydd.iteye.com/blog/1343729