用代码更新你的jar包

import static org.junit.Assert.*;

import java.io.File;import java.io.IOException;import java.util.Date;import java.util.Properties;

import org.apache.commons.io.FileUtils;import org.junit.Test;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.core.io.ClassPathResource;

public class JarUpdater { public static final Logger logger = LoggerFactory   .getLogger(JarUpdater.class);

 @Test /**  * 更新com目录下的所有文件到jar的对应目录结构中去  *   * 一次成功的代码更新，我们断言jar的大小是不一样的  */ public void updateClass() throws IOException, InterruptedException {

  ClassPathResource myPath = new ClassPathResource(    "jarUpdaterConfig.properties");  Properties p = new Properties();  p.load(myPath.getInputStream());

  ClassUpdater classUpdater = new ClassUpdater().applySettings(p);

  classUpdater.compileAndCopyClass();

  String workingDirectory = p.getProperty("workingDirectory");  String jar4UpdateName = p.getProperty("jar4UpdateName");  // class compile path  String updateSourcePath = workingDirectory + "target";  // class root folder  String updateSourceDir = "com";

  Date startDate = new Date();

  File myJar = new File(workingDirectory + jar4UpdateName);  if (!myJar.isFile()) {   logger.error("file with following path {} does not exist.",     jar4UpdateName);   return;  }  long oldLength = myJar.length();  logger.info("Now ready to update jar file with name:{},size:{}",    myJar.getName(), myJar.length());  String myCommand = "jar uf " + workingDirectory + jar4UpdateName    + " -C " + updateSourcePath + " " + updateSourceDir;  logger.info("Update command【{}】", myCommand);

  Runtime.getRuntime().exec(myCommand);

  while (!FileUtils.isFileNewer(myJar, startDate)) {   logger.info("sleep for two seconds,checking changes...");   Thread.sleep(2000);  }  assertNotEquals(    "jar may not be updated successfully,check the code please",    oldLength, myJar.length());  logger.info("Now finish update jar file with size:{}", myJar.length()); }}