Spring框架中为什么FileCopyUtils没有用呢？

Question

程序代码很简单：
package com.mzy.domain;

import org.junit.jupiter.api.*;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.util.FileCopyUtils;

import java.io.File;
import java.io.FileReader;
import java.io.InputStream;
import java.io.OutputStream;

/**

• Created by miaozhiyan on 2017/7/24.
  */
  public class Test3 {
  public static void main(String[] args) {
  try {
  Resource resource1 = new ClassPathResource("img/tex1.txt");
  InputStream is1 = resource1.getInputStream();

      Resource resource2 = new ClassPathResource("img/tex2.txt");
      InputStream is2 = resource2.getInputStream();
  
      System.out.println("res1:"+resource1.getFilename());
      System.out.println("res2:"+resource2.getFilename());
  
      EncodedResource encRes1 = new EncodedResource(resource1,"UTF-8");
      String content1 = FileCopyUtils.copyToString(encRes1.getReader());
      System.out.println("content1:"+content1);
  
      FileCopyUtils.copy(resource1.getFile(),new File(resource2.getFile().getParent()+"tex..txt"));
  
      byte [] b1 = FileCopyUtils.copyToByteArray(is1);
      FileCopyUtils.copy(b1,resource2.getFile());
  
      EncodedResource encRes2 = new EncodedResource(resource2,"UTF-8");
      String content2 = FileCopyUtils.copyToString(new FileReader(resource2.getFile()));
      System.out.println("content2:"+content2);
  }catch (Exception e){
  
  }
  

  }
  }

可是为什么输出都输出出来了，打开文件，里面还是空的？tex2是空的,tex3也没有？这是为什么啊？

Answer 1

String content2 = FileCopyUtils.copyToString(new FileReader(resource2.getFile()));

System.out.println("content2:"+content2);

    不知道你最后这是干嘛，还用reader，不是应该用printwriter之类的吗
    这个给你参考一下：

try {
FileOutputStream os=new FileOutputStream(new File("d:/22.jpg"));//被复制到此文件中
Resource resource=new ClassPathResource("/1.jpg"); //文件源 :找类文件下的这个.jpg文件
FileCopyUtils.copy(resource.getInputStream(),os);

PS:(

//FileOutputStream os=new FileOutputStream(new File(fpt+".jpg"));

//FileSystemResource resource = new FileSystemResource( "E:/union.jpg");

//FileCopyUtils.copy(resource.getInputStream(),os);

FileStstemResource //根据文件路径找

)