使用JSONObject放置/获取字节数组值 [英] Put/get byte array value using JSONObject

问题描述

我尝试使用以下代码从JSONObject中获取我的byte[]值，但我没有获得原始的byte[]值.

I tried to get my byte[] value from JSONObject using following code but I am not getting original byte[] value.

JSONArray jSONArray = jSONObject.getJSONArray(JSONConstant.BYTE_ARRAY_LIST);
    int len = jSONArray.length();
    for (int i = 0; i < len; i++) {
        byte[] b = jSONArray.get(i).toString().getBytes();
       //Following line creates pdf file of this byte arry "b"
        FileCreator.createPDF(b, "test PDF From Web Resource.pdf");

    }
}

以上代码创建了pdf文件，但文件无法打开，即损坏的文件.当我使用相同的类和方法创建文件时:

Above code creates pdf file but file can not open i.e corrupted file. When I use same class and method to create file:

FileCreator.createPDF(b, "test PDF From Web Resource.pdf");

在添加到JSONObject中之前，如下所示:

before adding into JSONObject like follwoing:

JSONObject jSONObject = new JSONObject();
jSONObject.put(JSONConstant.BYTE_ARRAY_LIST, bList);

它会创建文件，即我可以打开pdf文件并读取其内容.

it creates file i.e I can open pdf file and read its content.

从JSONObject获取byte[]以便创建损坏的文件，我做错了什么?请指导我.我一直欢迎发表评论.谢谢.

What I did wrong to get byte[] from JSONObject so that it is creating corrupted file? Please kindly guide me. And I always welcome to comments. Thank You.

推荐答案

最后，我在 apache commons 库的帮助下解决了我的问题.首先，我使用了以下依赖性.

Finally I solved my issue with the help of apache commons library. First I used following dependency.

<dependency>
  <groupId>commons-codec</groupId>
  <artifactId>commons-codec</artifactId>
  <version>1.6</version>
  <type>jar</type>
</dependency>

我以前使用的技术对我来说是错误的(不确定其他).以下是解决问题的方法.

The technique that I was using previously was wrong for me (Not sure for other). Following is the solution how I solved my problem.

解决方案:

我以前在JSONObject上添加了字节数组值，并存储为String.当我尝试从JSONObject获取到我的字节数组时，它返回String而不是我的原始字节数组.而且即使我使用以下命令也没有得到原始的字节数组:

byte[] bArray=jSONObject.getString(key).toString().getBytes();

现在

首先，我将字节数组编码为字符串，并在JSONObject上保留为该编码的字符串.见下文:

First I encoded my byte array into string and kept on JSONObject to that encoded string. See below:

byte[] bArray=(myByteArray);
//Following is the code that encoded my byte array and kept on String
String encodedString = org.apache.commons.codec.binary.Base64.encodeBase64String(bArray);
jSONObject.put(JSONConstant.BYTE_ARRAY_LIST , encodedString);

还有我得到的原始字节数组的代码:

String getBackEncodedString = jSONObject.getString(JSONConstant.BYTE_ARRAY_LIST);
//Following code decodes to encodedString and returns original byte array
byte[] backByte = org.apache.commons.codec.binary.Base64.decodeBase64(getBackEncodedString);
//Creating pdf file of this backByte
FileCreator.createPDF(backByte, "fileAfterJSONObject.pdf");

就是这样.

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