maven依赖文件自动解析

##maven依赖文件自动解析

###项目描述:
将web项目转换为maven格式时,需要解决jar包依赖,并生成pom.xml;
默认通过eclipse的maven插件自动转换时,原有的lib无法自动解析,需要手工编写pom文件,比较复杂;
通过此类,可以自动解析生成jar包的依赖信息;
经实践,约51%的jar可以自动解析,剩余的jar需要手工进行维护;

###解析算法:
1、如果jar文件由maven生成,则jar文件中包含pom.properties文件,可以解析该文件获取pom信息;
2、如果无法从jar文件中解析,则从本地maven资源库中读取pom信息,默认pom文件命名:jar文件名.pom
3、对于无法解析的内容,需要将jar文件名拷贝到excel中,手工编辑依赖信息;

###java代码

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;

import org.apache.log4j.Logger;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;

public class MavenDependencyExtract {
	private static Logger log = Logger.getLogger(MavenDependencyExtract.class);

	public static void main(String[] args) throws Exception {
		// 待解析的jar包目录
		String projectPath = "D:\\WorkSpace\\lib";
		// 本地manven资源库
		String mavenPath = "E:\\maven\\repository";
		(new MavenDependencyExtract()).parse(projectPath, mavenPath);
	}

	public void parse(String projectPath, String mavenPath) {
		try {
			List<File> projectLibList = new ArrayList<File>();
			List<String> findList = new ArrayList<String>();
			Map<String, String> mvnPomMap = new HashMap<String, String>();

			initFileMap(mavenPath, mvnPomMap, ".pom");
			initFileList(projectPath, projectLibList, ".jar");

			System.out.println("-----------------------------------------start");
			System.out.println("jar文件\t状态\t依赖包");
			for (File f : projectLibList) {
				String dep = parseJarFile(f.getAbsolutePath());
				String name = f.getName();
				String status = "否";

				if (dep == null || dep.equals("")) // 从maven查找
					dep = parsePomFile(name, mvnPomMap);

				if (dep == null || dep.equals("")) {// 无法解析
					dep = "";
				} else {
					status = "是";
					findList.add(name);
				}
				System.out.println(name + "\t" + status + "\t" + dep);
			}
			System.out.println("-----------------------------------------end");
			System.out.println("jar包总数:" + projectLibList.size());
			DecimalFormat df = new DecimalFormat("#.00");
			System.out.println("匹配pom数:" + findList.size() + "("
					+ df.format(findList.size() * 100.0 / projectLibList.size()) + "%)");
			System.out.println("对于无法解析的内容,请将横线中的内容拷贝到excel中,进行二次编辑。");

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 从jar文件中解析maven依赖信息
	 * 
	 * 
	 * 原始文件:quartz-1.8.6.jar
	 * 原始数据样式:
	 * version=1.8.6
	 * groupId=org.quartz-scheduler
	 * artifactId=quartz
	 * 
	 * 解析后返回的数据样式:
	 * 
	 * org.quartz-scheduler
	 * quartz
	 * 1.8.6
	 * 
	 * 
* * @param file * @return maven格式依赖信息 * @throws Exception */
private String parseJarFile(String file) throws Exception { ZipFile zf = new ZipFile(file); InputStream in = new BufferedInputStream(new FileInputStream(file)); ZipInputStream zin = new ZipInputStream(in); ZipEntry ze; String dep = ""; while ((ze = zin.getNextEntry()) != null) { if (ze.isDirectory()) { } else { long size = ze.getSize(); if (size > 0 && ze.getName().matches(".*pom.properties")) { BufferedReader br = new BufferedReader(new InputStreamReader(zf.getInputStream(ze))); String line; Map<String, String> map = new HashMap<String, String>(); while ((line = br.readLine()) != null) { String name = null; if (line.matches("version=.*")) name = "version"; if (line.matches("groupId=.*")) name = "groupId"; if (line.matches("artifactId=.*")) name = "artifactId"; if (name != null) map.put(name, line.split("=")[1]); } br.close(); if (map.size() == 3) { dep = ""; dep += "" + map.get("groupId") + ""; dep += "" + map.get("artifactId") + ""; dep += "" + map.get("version") + ""; dep += ""; } } } } zin.closeEntry(); zin.close(); zf.close(); return dep; } /** * 从pom文件中解析maven依赖信息 * * @param name * 待解析的jar文件名称 * @param mvnPomMap * 包含pom文件的map * @return 解析后的解析maven依赖信息 */ private String parsePomFile(String name, Map<String, String> mvnPomMap) { String dep = ""; name = name.substring(0, name.length() - 3) + "pom"; if (mvnPomMap.containsKey(name)) { String path = mvnPomMap.get(name); Element root = getRoot(path); dep = ""; dep += getWarpValue(root, "groupId"); dep += getWarpValue(root, "artifactId"); dep += getWarpValue(root, "version"); dep += ""; } return dep; } private String getWarpValue(Element parent, String childName) { String result = ""; Element element = parent.element(childName); if (element != null) { result = "<" + childName + ">" + element.getStringValue() + " + childName + ">"; } return result; } /** * 获取xml根节点 * * @param fileName * xml文件名称 * @return 返回xml根节点 */ private Element getRoot(String fileName) { Element root = null; try { Document document = DocumentHelper.parseText(getFileString(fileName)); root = document.getRootElement(); } catch (Exception e) { log.error("初始化xml失败:" + e); } return root; } /** * 遍历目录下的,扩展名为suffix的文件列表 * * @param strPath * 根目录 * @param filelist * 返回list * @param suffix * 文件扩展名 */ private void initFileList(String strPath, List<File> filelist, String suffix) { File dir = new File(strPath); File[] files = dir.listFiles(); if (files != null) { for (File f : files) { String fileName = f.getName(); if (f.isDirectory()) { initFileList(f.getAbsolutePath(), filelist, suffix); } else if (fileName.endsWith(suffix)) { filelist.add(f); } } } } /** * 遍历目录下的,扩展名为suffix的文件 * * @param strPath * 根目录 * @param fileMap * 返回map * @param suffix * 文件扩展名 */ private void initFileMap(String strPath, Map<String, String> fileMap, String suffix) { File dir = new File(strPath); File[] files = dir.listFiles(); if (files != null) { for (File f : files) { String fileName = f.getName(); if (f.isDirectory()) { initFileMap(f.getAbsolutePath(), fileMap, suffix); } else if (fileName.endsWith(suffix)) { fileMap.put(fileName, f.getAbsolutePath()); } } } } /** * 读取文本文件,返回字符串 * * @param path * 文件全路径 * @return 返回文件内容 */ private String getFileString(String path) { String result = ""; try { BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(path), "utf-8")); String line; while ((line = br.readLine()) != null) result += line; br.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return result; } }

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