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JDK9版本以上可以直接使用input.transferTo(output)方法

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#1 Created at ... [Delete] [Delete and Lock User]

jdk8版本方式

        byte[] buffer = new byte[1024];
        int n;
        while ((n=in.read(buffer))!=-1){
            out.write(buffer);
        }
        out.flush();

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#2 Created at ... [Delete] [Delete and Lock User]

// output.write(buffer); // 占位字符会导致产生字符串末尾产生不可意料的字符

   out.write(Arrays.copyOf(buffer, n));

廖雪峰

#3 Created at ... [Delete] [Delete and Lock User]

你不要乱写，读的结果是n个字节，不一定读满buffer，写的时候自然也只能写n个字节

out.write(buffer, 0, n);

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#4 Created at ... [Delete] [Delete and Lock User]

哇偶，第一次被廖大回复，是的，这个自己测得时候就出问题了，忘了读几个写几个，谢谢廖大指正！

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