java 读取本jar包内的资源文件

   

package com.test.io;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStreamReader;

/**
 * 需要在d盘建立临时文件。
 * D:\\test\\test2.txt
 * 
 * @author DZIT
 * 
 */
public class IoTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// 字符读取写入
		BufferedReader in1 = null;
		BufferedReader in2 = null;
		BufferedWriter ow1 = null;
		BufferedWriter ow2 = null;

		// 字节读取写入
		BufferedInputStream is1 = null;
		BufferedOutputStream os1 = null;
		try {
			// 从class同级文件读取字符数据
			in1 = new BufferedReader(new InputStreamReader(IoTest.class
					.getClassLoader().getResourceAsStream(
							"com/test/io/test.txt"), "utf-8"));
			// 写入到文件系统
			ow1 = new BufferedWriter(new FileWriter(new File(
					"D:\\test\\out1.txt")));

			// 从文件系统读取数据
			in2 = new BufferedReader(new FileReader("D:\\test\\test2.txt"));
			// 写入到文件系统
			ow2 = new BufferedWriter(new FileWriter(new File(
					"D:\\test\\out2.txt")));

			String str = null;
			while ((str = in1.readLine()) != null) {
				System.out.println(str);
				ow1.write(str);
				// 换行
				ow1.newLine();
				// 刷新，否侧可能不出数据
				ow1.flush();
			}

			str = null;
			while ((str = in2.readLine()) != null) {
				System.out.println(str);
				ow2.write(str);
				ow2.newLine();
				ow2.flush();
			}

			// 从class同级文件读取字节数据。同理可参照上边从文件系统读取数据。
			is1 = new BufferedInputStream(IoTest.class.getClassLoader()
					.getResourceAsStream("com/test/io/asd.jpg"));

			os1 = new BufferedOutputStream(new FileOutputStream(new File(
					"D:\\test\\outImage.jpg")));
			byte[] b = new byte[1024];
			while (is1.read(b) != -1) {
				os1.write(b);
			}
			os1.flush();

			in1.close();
			in2.close();
			ow1.close();
			ow2.close();
			is1.close();
			os1.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

  









//for resource test in jar
        try{
        //读取资源文件，但是打成jar包后会出错。
        ResourceBundleTest test = new ResourceBundleTest();
        URL url = test.getClass().getResource("/config/REG_IP1.xsd");
        System.out.println("url is ====:" + url.toURI());
        FileReader fdata = new FileReader(new File(url.toURI()));
       
        //读取资源文件，打成jar包后会也没有问题。
        InputStream in=test.getClass().getResourceAsStream("/config/REG_IP1.xsd");
        Reader inreader=new InputStreamReader(in);

       
            //读取项目根目录下的文件
            Properties props = new Properties();  
            props.load(new FileInputStream("db.properties"));
        System.out.println("读取项目根目录下的文件");

            //读取bin目录下的文件。如下示例为 文件放在 src/conf 下的test。property文件。编译后会在bin/conf下
            ResourceBundle bund = ResourceBundle.getBundle("conf.test", Locale.getDefault());
        System.out.println("读取bin目录下的文件");
           
            //yy.properties应放在/WEB-INF/classes目录
            //ResourceBundle res = ResourceBundle.getBundle("yy.properties");
           
           
            //读取跟当前class相同目录下的文件
            Properties props2=new Properties();
            props2.load(ResourceBundleTest.class.getResourceAsStream("ResourceBundleTest.properties"));
         

        }catch(Exception e){
        System.out.println("E  getResource !!");
        }
    }