用代码更新你的jar包

假设目录结构是maven标准结构

-src
-target
-test.jar(你需要更新的jar包)

package com.foo.common.base.utils.development;

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());
 }
}