import java.io.*;
import java.util.Enumeration;
import java.util.LinkedList;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
/**
* jarPath: jar包所在路径
* jarFilePath: jar中想要修改文件所在的路径
* regex:正则表达式
* replacement:替换的字符串
* 注意:Jar包内的jar包内的文件不适用!
*/
public class JarTool {
public void change(String jarPath, String jarFilePath, String regex, String replacement) throws IOException {
File file = new File(jarPath);
JarFile jarFile = new JarFile(file);// 通过jar包的路径 创建Jar包实例
change(jarFile, jarFilePath, regex, replacement);
}
public void change(JarFile jarFile, String jarFilePath, String regex, String replacement) throws IOException {
JarEntry entry = jarFile.getJarEntry(jarFilePath);//通过某个文件在jar包中的位置来获取这个文件
//创建该文件输入流
InputStream input = jarFile.getInputStream(entry);
//获取entries集合lists
List<JarEntry> lists = new LinkedList<>();
Enumeration<JarEntry> entries = jarFile.entries();
while (entries.hasMoreElements()) {
JarEntry jarEntry = entries.nextElement();
lists.add(jarEntry);
}
String s = readFile(input, regex, replacement);// 读取并修改文件内容
writeFile(lists, jarFilePath, jarFile, s);// 将修改后的内容写入jar包中的指定文件
jarFile.close();
}
private static String readFile(InputStream input, String regex, String replacement)
throws IOException {
InputStreamReader isr = new InputStreamReader(input);
BufferedReader br = new BufferedReader(isr);
StringBuilder buf = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
// 此处根据实际需要修改某些行的内容
buf.append(line);
buf.append(System.getProperty("line.separator"));
}
br.close();
return buf.toString().replaceAll(regex, replacement);
}
private static void writeFile(List<JarEntry> lists, String jarFilePath,
JarFile jarFile, String content) throws IOException {
FileOutputStream fos = new FileOutputStream(jarFile.getName(), true);
JarOutputStream jos = new JarOutputStream(fos);
try {
for (JarEntry je : lists) {
if (je.getName().equals(jarFilePath)) {
// 将内容写入文件中
jos.putNextEntry(new JarEntry(jarFilePath));
jos.write(content.getBytes());
} else {
//表示将该JarEntry写入jar文件中 也就是创建该文件夹和文件
jos.putNextEntry(new JarEntry(je));
jos.write(streamToByte(jarFile.getInputStream(je)));
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭流
jos.close();
}
}
private static byte[] streamToByte(InputStream inputStream) {
ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
try {
byte[] buffer = new byte[1024];
int len;
while ((len = inputStream.read(buffer)) != -1) {
outSteam.write(buffer, 0, len);
}
outSteam.close();
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
return outSteam.toByteArray();
}
public static void main(String[] args) throws IOException {
JarTool jarTool = new JarTool();
jarTool.change("D:\\IDEA\\workSpace\\demo.jar"
, "spring/spring-aop.xml", "expression=\".*\"", "expression=\"%%\"");
}
}
原文地址:https://www.cnblogs.com/yueshutong/p/10357275.html
时间: 2024-10-13 03:20:36