《精通Spring4.X企业应用开发实战》读后感第四章（资源访问）

package com.smart.resource;

import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.PathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.WritableResource;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class FileSourceExample {

    public static void main(String[] args) {
        try {
            String filePath = "E:\\learn\\spring4.x\\chapter4\\src\\main\\resources\\conf\\test.txt";

            //使用系统文件路径方式加载文件
            WritableResource res1 = new PathResource(filePath);

            //使用类路径方式加载文件
            Resource res2 = new ClassPathResource("conf/test.txt");

            //使用WritableResource接口写资源文件
            OutputStream stream1 = res1.getOutputStream();
            stream1.write("欢迎光临\n小春论坛".getBytes());
            stream1.close();

            //使用Resource接口读资源文件
            InputStream ins1 = res1.getInputStream();
            InputStream ins2 = res2.getInputStream();

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            int i;
            while ((i = ins1.read()) != -1) {
                baos.write(i);
            }
            System.out.println(baos.toString());

            System.out.println("res1: " + res1.getFilename());
            System.out.println("res2: " + res2.getFilename());

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}