给JAVA源代码文件统一地添加licence信息头

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package com.apdplat.platform.util;


import java.io.*;
import java.util.ArrayList;
import java.util.List;
/**
 * 给JAVA源代码文件统一地添加licence信息头
 * 检查文件package、import、类级别注释、是否有public class
 * 用到了Java7的新特性，强大
 * @author ysc
 */
public class AddLicenceForJavaFile {
    private static int count = 0;
    private static List<String> fail = new ArrayList<>();
    private static List<String> wrong = new ArrayList<>();


    public static void main(String[] args) {
        String licence="/**\n" +
" * Licensed to the Apache Software Foundation (ASF) under one or more\n" +
" * contributor license agreements.  See the NOTICE file distributed with\n" +
" * this work for additional information regarding copyright ownership.\n" +
" * The ASF licenses this file to You under the Apache License, Version 2.0\n" +
" * (the \"License\"); you may not use this file except in compliance with\n" +
" * the License.  You may obtain a copy of the License at\n" +
" *\n" +
" *     http://www.apache.org/licenses/LICENSE-2.0\n" +
" *\n" +
" * Unless required by applicable law or agreed to in writing, software\n" +
" * distributed under the License is distributed on an \"AS IS\" BASIS,\n" +
" * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n" +
" * See the License for the specific language governing permissions and\n" +
" * limitations under the License.\n" +
" */";
        addLicenceForJavaFile(new File("D:\\Workspaces\\NetBeansProjects\\APDPlat"),licence);
        System.out.println("为 "+count+" 个Java源代码文件添加licence信息头");
        if(fail.size()>0){
            System.out.println("处理失败个数 "+fail.size());
            for(String f : fail){
                System.out.println("        "+f);
            }
        }
        if(wrong.size()>0){
            System.out.println("JAVA源代码错误个数 "+wrong.size());
            for(String w : wrong){
                System.out.println("        "+w);
            }
        }
    }
    /**
     * 给JAVA源代码文件统一地添加licence信息头
     * @param path 源码所处的根目录
     * @param licence 许可证信息（在netbeans中复制一段文本粘贴到变量的双引号内，IDE自动格式化，相当赞）
     */
    private static void addLicenceForJavaFile(File path, String licence) {
        if (path != null && path.exists()) {
            //处理文件夹
            if (path.isDirectory()) {
                String[] children = path.list();
                for (int i = 0; i < children.length; i++) {
                    File child = new File(path.getPath() + System.getProperty("file.separator") + children[i]);
                    //递归处理
                    addLicenceForJavaFile(child, licence);
                }
            } else {
                //处理java文件
                if (path.getName().toLowerCase().endsWith(".java")) {
                    System.out.println(path.getAbsolutePath());
                    count++;
                    try {
                        byte[] content;
                        try (RandomAccessFile f = new RandomAccessFile(path, "rw")) {
                            content = new byte[ (int) f.length()];
                            f.readFully(content);
                        }
                        String text = new String(content);
                        text = text.trim();
                        while (text.startsWith("/n")) {
                            text = text.substring(1);
                        }
                        //如果已经有同样的licence，则忽略
                        int pos = text.indexOf(licence);
                        if(pos!=-1){
                            return;
                        }
                        //有package声明的，保留package以后的内容
                        if (text.indexOf("package") != -1) {
                            text = text.substring(text.indexOf("package"));
                        }
                        //没有package声明的，有import声明的，保留import以后的内容
                        else if (text.indexOf("package") == -1 && text.indexOf("import") != -1) {
                            text = text.substring(text.indexOf("import"));
                        }
                        //没有package声明也没有import声明的，有类级别注释的，则保留类级别注释以后的内容
                        else if (text.indexOf("package") == -1 && text.indexOf("import") == -1 && text.indexOf("/**") != -1 && text.indexOf("public class") != -1 && text.indexOf("/**")<text.indexOf("public class") ) {
                            text = text.substring(text.indexOf("/**"));
                        }
                        //没有package声明也没有import声明的，也没有类级别注释的则保留public class以后的内容
                        else if (text.indexOf("package") == -1 && text.indexOf("import") == -1 && text.indexOf("public class") != -1 && ( text.indexOf("/**")>text.indexOf("public class") || text.indexOf("/**")==-1 )) {
                            text = text.substring(text.indexOf("public class"));
                        }else{
                            wrong.add(path.getAbsolutePath());
                            return;
                        }
                        try (FileWriter writer = new FileWriter(path)) {
                            writer.write(licence);
                            writer.write("\n\n");
                            writer.write(text);
                        }
                    }
                    catch (Exception ex) {
                        fail.add(path.getAbsolutePath());
                    }
                }
            }
        }
    }
}