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我从外部网络得到一个 Base64 解码的字符串，我会将字符串转换为字节并解码。然后它将更改为 ASCII 格式。我将把这个 ASCII 存储在发送到另一台服务器的字符串中。在这种情况下，当我再次对 ASCII 进行编码时，我得到的值与我从外部网络收到的值不同。但它在 unix 系统中运行良好，问题仅在 windows 中。

//          Base64 Encode
        String  orig = "mj5ok9qWt2v6fg3kElm8vZGeg9ZV0BqE1u2sYUQDEm8/heIdCH4ZRf7mcEcGkb8y3I24peAUBHdli8GP/MCZR/PG4NAAzd+AU3uEVM3RKTFnYwGslKQTfKgXzg+K+wkMY/0fexPkDrgVHi0vR7VXzcyx200iJYTYjJZLCwahZ7E2Cp7LW14YpCAYg8vFCp0XSZCe1luRNgq+q9xVQ88tDamAB5nGCxYZcx7X4D49HQR5vUEzIkJu2XenGQygXsGWICKv0UrVq72um0nRf0uJUa/jdMVXWtyeAsKTaVw8KTW5u745d+r7H3Fzcsl9UwL0kBfHv4WMQwz1dQ+MommXmA==";                      
        byte [] decodedvalue = Base64.decodeBase64(orig.getBytes());
        byte [] encodedvalue = Base64.encodeBase64(decodedvalue);               
        System.out.println("ORIGINAL VALUE : "+orig);
        System.out.println("ENCODED VALUE :  "+new String(encodedvalue));
        String aa =new String(decodedvalue);
        String temp = new String(Base64.encodeBase64(aa.getBytes()));
        System.out.println(" String encoded value : " +temp);

ORIGINAL VALUE : mj5ok9qWt2v6fg3kElm8vZGeg9ZV0BqE1u2sYUQDEm8/heIdCH4ZRf7mcEcGkb8y3I24peAUBHdli8GP/MCZR/PG4NAAzd+AU3uEVM3RKTFnYwGslKQTfKgXzg+K+wkMY/0fexPkDrgVHi0vR7VXzcyx200iJYTYjJZLCwahZ7E2Cp7LW14YpCAYg8vFCp0XSZCe1luRNgq+q9xVQ88tDamAB5nGCxYZcx7X4D49HQR5vUEzIkJu2XenGQygXsGWICKv0UrVq72um0nRf0uJUa/jdMVXWtyeAsKTaVw8KTW5u745d+r7H3Fzcsl9UwL0kBfHv4WMQwz1dQ+MommXmA==

ENCODED VALUE : mj5ok9qWt2v6fg3kElm8vZGeg9ZV0BqE1u2sYUQDEm8/heIdCH4ZRf7mcEcGkb8y3I24peAUBHdli8GP/MCZR/PG4NAAzd+AU3uEVM3RKTFnYwGslKQTfKgXzg+K+wkMY/0fexPkDrgVHi0vR7VXzcyx200iJYTYjJZLCwahZ7E2Cp7LW14YpCAYg8vFCp0XSZCe1luRNgq+q9xVQ88tDamAB5nGCxYZcx7X4D49HQR5vUEzIkJu2XenGQygXsGWICKv0UrVq72um0nRf0uJUa/jdMVXWtyeAsKTaVw8KTW5u745d+r7H3Fzcsl9UwL0kBfHv4WMQwz1dQ+MommXmA==

String encoded value : mj5ok9qWt2v6fg3kElm8vZGeg9ZV0BqE1u2sYUQDEm8/heIdCH4ZRf7mcEcGkb8y3D+4peAUBHdli8E//MCZR/PG4NAAzd+AU3uEVM3RKTFnYwGslKQTfKgXzg+K+wkMY/0fexPkDrgVHi0vR7VXzcyx200iJYTYjJZLCwahZ7E2Cp7LW14YpCAYg8vFCj8XST+e1luRNgq+q9xVQ88tDamAB5nGCxYZcx7X4D49HQR5vUEzIkJu2XenGQygXsGWICKv0UrVq72um0nRf0uJUa/jdMVXWtyeAsKTaVw8KTW5u745d+r7H3Fzcsl9UwL0PxfHv4WMQwz1dQ+MommXmA==

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