代码生成MANIFEST.MF文件

墨蓝 2021-09-27 18:24 352阅读 0赞

我在查询怎么把java项目打包成jar包时，很多文章都提到了MANIFEST.MF这个文件，但是对于怎么生成这个文件，都只是说了手写，手写，手写。真好意思啊。

于是我就写了一个简易版的自动生成代码，只生成了比较关键的部分。

lib信息取自.classpath文件，如果由于ide的原因没有这个文件或者格式不一样，本文方法不适用（我用的是myeclipse）。

package test;
    
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.PrintWriter;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    public class Test { 
    
    	/** * @param args * @throws IOException */
    	public static void main(String[] args) throws IOException { 
    		// TODO Auto-generated method stub
    		
    		String mainClass = Test.class.getName();	//要启动的类
    		
    		System.out.println(new File(".classpath").exists());
    		
    		List<String> list = readFile(".classpath");
    		
    		Pattern pattern = Pattern.compile("path=\"(.*?)\"");
    		Pattern patternCheck = Pattern.compile("kind=\"lib\"");
    		Matcher matcher;
    		
    		String libStr = "";
    		
    		for(String str : list){ 
    			
    			matcher = patternCheck.matcher(str);
    			if(!matcher.find())
    				continue;
    			
    			matcher = pattern.matcher(str);
    			if(matcher.find())
    				libStr += matcher.group(1) + " ";
    		}
    		
    		if(libStr == null || libStr.length() == 0)
    			libStr += " ";
    		
    		File file = new File("MANIFEST.MF");
    		file.delete();
    		
    		file.createNewFile();
    		
    		writeTxtFile(file, "Manifest-Version: 1.0");
    		writeTxtFile(file, "Main-Class: " + mainClass);
    		writeTxtFile(file, "Class-Path: " + libStr);
    	}
    	
        public static List<String> readFile(String path) throws IOException { 
            List<String> list = new ArrayList<String>();
            FileInputStream fis = new FileInputStream(path);
            InputStreamReader isr = new InputStreamReader(fis, "UTF-8");
            BufferedReader br = new BufferedReader(isr);
            String line = "";
            while ((line = br.readLine()) != null) { 
                if (line.lastIndexOf("---") < 0) { 
                    list.add(line);
                }
            }
            br.close();
            isr.close();
            fis.close();
            return list;
        }
    	
    	public static boolean writeTxtFile(File file, String newStr) throws IOException { 
    		boolean flag = false;
    		String filein = newStr + "\r\n";
    		String temp = "";
     
    		FileInputStream fis = null;
    		InputStreamReader isr = null;
    		BufferedReader br = null;
     
    		FileOutputStream fos = null;
    		PrintWriter pw = null;
    		try { 
    			fis = new FileInputStream(file);
    			isr = new InputStreamReader(fis);
    			br = new BufferedReader(isr);
    			StringBuffer buf = new StringBuffer();
     
    			for (int j = 1; (temp = br.readLine()) != null; j++) { 
    				buf = buf.append(temp);
    				buf = buf.append(System.getProperty("line.separator"));
    			}
    			buf.append(filein);
     
    			fos = new FileOutputStream(file);
    			pw = new PrintWriter(fos);
    			pw.write(buf.toString().toCharArray());
    			pw.flush();
    			flag = true;
    		} catch (IOException e) { 
    			throw e;
    		} finally { 
    			if (pw != null) { 
    				pw.close();
    			}
    			if (fos != null) { 
    				fos.close();
    			}
    			if (br != null) { 
    				br.close();
    			}
    			if (isr != null) { 
    				isr.close();
    			}
    			if (fis != null) { 
    				fis.close();
    			}
    		}
    		return flag;
    	}
    
    }