com.kaka.util.ResourceUtils Maven / Gradle / Ivy
package com.kaka.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
/**
* 资源路径
*
* @author zkpursuit
*/
public class ResourceUtils {
/**
* 获取项目工程根目录
*
* @return 项目根目录
*/
public static String getProjectDirectoryPath() {
try {
return new File("").getCanonicalPath();
} catch (IOException ex) {
}
return System.getProperty("user.dir");
}
/**
* -----------------------------------------------------------------------
* getClassLoaderPath需要一个当前程序使用的Java类的class属性参数，它可以返回打包过的
* Java可执行文件（jar，war）所处的系统目录名或非打包Java程序所处的目录
*
* class.getProtectionDomain().getCodeSource().getLocation()
*
* @param cls 为Class类型
* @return 返回值为该类所在的Java程序运行的目录,如果该类在某个jar包中，则返回此jar包的父级目录
* -------------------------------------------------------------------------
*/
public static String getClassLoaderPath(Class cls) {
//检查用户传入的参数是否为空
if (cls == null) {
throw new IllegalArgumentException("参数不能为空！");
}
ClassLoader loader = cls.getClassLoader();
//获得类的全名，包括包名
String clsName = cls.getName() + ".class";
//获得传入参数所在的包
Package pack = cls.getPackage();
String path = "";
//如果不是匿名包，将包名转化为路径
if (pack != null) {
String packName = pack.getName();
//此处简单判定是否是Java基础类库，防止用户传入JDK内置的类库
if (packName.startsWith("java.") || packName.startsWith("javax.")) {
throw new IllegalArgumentException("不要传送系统类！");
}
//在类的名称中，去掉包名的部分，获得类的文件名
clsName = clsName.substring(packName.length() + 1);
if (!packName.contains(".")) {
path = packName + "/";
} else {
path = packName.replace('.', '/') + "/";
}
}
//调用ClassLoader的getResource方法，传入包含路径信息的类文件名
java.net.URL url = loader.getResource(path + clsName);
//从URL对象中获取路径信息
String realPath = url.getPath();
//去掉路径信息中的协议名"file:"
int pos = realPath.indexOf("file:");
if (pos > -1) {
realPath = realPath.substring(pos + 5);
}
//去掉路径信息最后包含类文件信息的部分，得到类所在的路径
pos = realPath.indexOf(path + clsName);
realPath = realPath.substring(0, pos - 1);
//如果类文件被打包到JAR等文件中时，去掉对应的JAR等打包文件名
if (realPath.endsWith("!")) {
realPath = realPath.substring(0, realPath.lastIndexOf("/"));
}
try {
realPath = java.net.URLDecoder.decode(realPath, "utf-8");
} catch (Exception e) {
throw new RuntimeException(e);
}
return realPath;
}
/**
* 获取文件流
*
* @param fileName 文件名
* @param cls 参考类
* @return 文件输入流
*/
public final static InputStream getResourceAsStream(String fileName, Class cls) {
//cls包下读取
InputStream is = null;
try {
is = cls.getResourceAsStream(fileName);
} catch (Exception ex) {
}
if (is == null) {
//cls根包下读取
try {
is = cls.getClassLoader().getResourceAsStream(fileName);
} catch (Exception ex) {
}
}
if (is == null) {
//编译后的classes文件夹下
try {
is = cls.getProtectionDomain().getClassLoader().getResourceAsStream(fileName);
} catch (Exception ex) {
}
}
if (is == null) {
try {
is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
} catch (Exception ex) {
}
}
if (is == null) {
String path = getClassLoaderPath(cls);
String filePath = path + "/" + fileName;
try {
is = new FileInputStream(filePath);
} catch (FileNotFoundException ex) {
//再找不到就往父级查找，如果父级还是没有，则返回null
File f = new File(path);
if (f.exists()) {
path = f.getParent();
filePath = path + "/" + fileName;
try {
is = new FileInputStream(filePath);
} catch (FileNotFoundException e) {
}
}
}
}
return is;
}
}