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。

 

Java代码  

1. import java.io.BufferedReader;  
2. import java.io.File;  
3. import java.io.FileInputStream;  
4. import java.io.FileOutputStream;  
5. import java.io.InputStreamReader;  
6. import java.util.ArrayList;  
7.   
8. public class EclipseM2Patch {  
9.   
10.     private static String fileToString(File f) throws Exception {  
11.         byte[] bytes = fileToBytes(f);  
12.         if (bytes.length == 0)  
13.             return null;  
14.         return new String(bytes, "iso-8859-1");  
15.     }  
16.   
17.     private static byte[] fileToBytes(File f) throws Exception {  
18.         if (!f.exists())  
19.             return null;  
20.         FileInputStream fis = null;  
21.         byte[] all = new byte[0];  
22.         try {  
23.             byte[] buf = new byte[1024];  
24.             fis = new FileInputStream(f);  
25.             int read = -1;  
26.             while ((read = fis.read(buf)) != -1) {  
27.                 byte[] tmp = new byte[all.length + read];  
28.                 if (all.length > 0)  
29.                     System.arraycopy(all, 0, tmp, 0, all.length);  
30.                 System.arraycopy(buf, 0, tmp, all.length, read);  
31.                 all = tmp;  
32.             }  
33.         } finally {  
34.             if (fis != null)  
35.                 fis.close();  
36.         }  
37.         return all;  
38.     }  
39.   
40.     private static void write(File f, String content) throws Exception {  
41.         FileOutputStream fos = new FileOutputStream(f);  
42.         try {  
43.             fos.write(content.getBytes("iso-8859-1"));  
44.         } finally {  
45.             fos.close();  
46.         }  
47.     }  
48.   
49.     private static File backup(File f) throws Exception {  
50.         byte[] bytes = fileToBytes(f);  
51.         if (bytes.length > 0) {  
52.             File backupfile = new File(f.getAbsoluteFile() + ".patchbackup");  
53.             FileOutputStream fos = new FileOutputStream(backupfile);  
54.             try {  
55.                 fos.write(bytes);  
56.             } finally {  
57.                 fos.close();  
58.             }  
59.             return backupfile;  
60.         }  
61.         return null;  
62.     }  
63.   
64.     public static void main(String[] args) throws Exception {  
65.         String workspacepath = args.length == 0 ? null : args[0];  
66.         if (workspacepath == null) {  
67.             File file = new File(".");  
68.             String p = file.getAbsolutePath().replaceAll("(?i)(workspace[^\\\\/]+).*", "$1");  
69.             if (p.length() != file.getAbsolutePath().length()) {  
70.                 workspacepath = p;  
71.             }  
72.         }  
73.         if (workspacepath == null) {  
74.             throw new IllegalAccessException();  
75.         }  
76.         ArrayList<File> backups = new ArrayList<File>();  
77.         File workspace = new File(workspacepath);  
78.         for (File projectBaseDir : workspace.listFiles()) {  
79.             if (projectBaseDir.isDirectory()  
80.                     && projectBaseDir.getName().matches("^\\p{Alpha}[\\p{Alpha}_-]+$")) {  
81.                 File _project = new File(projectBaseDir, ".project");  
82.                 File _classpath = new File(projectBaseDir, ".classpath");  
83.                 if (_project.exists()) {  
84.                     String content = fileToString(_project);  
85.                     String addToContent = "<nature>org.eclipse.m2e.core.maven2Nature</nature>";  
86.                     if (!content.contains(addToContent)) {  
87.                         File backupfile = backup(_project);  
88.                         if (backupfile != null)  
89.                             backups.add(backupfile);  
90.                         content = content.replaceAll("(?im)(\\s+)(?=</natures>)", "$1\t" + addToContent  
91.                                 + "$1");  
92.                         write(_project, content);  
93.                         System.out.println("file:" + _project + " - patched");  
94.                     } else {  
95.                         File backupfile = new File(_project.getAbsoluteFile() + ".patchbackup");  
96.                         if (backupfile.exists()) {  
97.                             backups.add(backupfile);  
98.                         }  
99.                     }  
100.                 }  
101.                 if (_classpath.exists()) {  
102.                     String content = fileToString(_classpath);  
103.                     String addToContent = "<classpathentry kind=\"con\" path=\"org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER\"/>";  
104.                     if (!content.contains("org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER")) {  
105.                         File backupfile = backup(_classpath);  
106.                         if (backupfile != null)  
107.                             backups.add(backupfile);  
108.                         content = content.replaceAll("(?im)(\\s+)(?=</classpath>)", "$1\t" + addToContent  
109.                                 + "$1");  
110.                         write(_classpath, content);  
111.                         System.out.println("file:" + _classpath + " - patched");  
112.                     } else {  
113.                         File backupfile = new File(_classpath.getAbsoluteFile() + ".patchbackup");  
114.                         if (backupfile.exists()) {  
115.                             backups.add(backupfile);  
116.                         }  
117.                     }  
118.                 }  
119.             }  
120.         }  
121.         BufferedReader rd = new BufferedReader(new InputStreamReader(System.in));  
122.         String line = null;  
123.         if (backups.size() > 0) {  
124.             System.out.println(">Delete all backups?(Y-yes/N-no/R-rollback)");  
125.             line = rd.readLine();  
126.             for (File f : backups) {  
127.                 if ("y".equalsIgnoreCase(line)) {  
128.                     boolean delete = f.delete();  
129.                     System.out.println("Delete file:" + f + " - " + (delete ? "ok" : "fail"));  
130.                 } else if ("r".equalsIgnoreCase(line)) {  
131.                     File file = new File(f.getAbsolutePath().replace(".patchbackup", ""));  
132.                     boolean result = file.delete();  
133.                     if (result)  
134.                         result = f.renameTo(file);  
135.                     System.out.println("Rollback file:" + f + " - " + (result ? "ok" : "fail"));  
136.                 }  
137.             }  
138.         }  
139.         System.out.println(">Press any key to continue...");  
140.         line = rd.readLine();  
141.         rd.close();  
142.     }  
143. }