问题用java字符串和字符串构建器 [英] Issue with java String and String Builder

问题描述

我在其中我不得不解密​​从PHP服务器一个XML文本，并解析到Java的一个项目工作，我以CipherInputStream解密的XML文本，并看到XML文件完全得到打印出来，但我面对一个而奇怪的问题试图存储在一个Java字符串的XML文本，我正在下面的code：

I'm working on a project in which I have to decrypt a xml text from PHP server and parse into java, I have decrypted the xml text by using CipherInputStream and seen xml file fully get printed, but I'm facing a weird issue while trying to store the xml text in a java string, I'm working on the code below:

public String decrypt(InputStream Fis){

Cipher c = Cipher.getInstance(algo + "/CBC/NoPadding");

String add = "";

StringBuilder getAns = new StringBuilder();

c.init(Cipher.DECRYPT_MODE, key);

CipherInputStream cis = new CipherInputStream(Fis , c);

byte[] encData = new byte[16];

int dummy;

while ((dummy = cis.read(encData)) != -1)
        {

            System.out.println(new String(encData, "UTF-8").trim()); 

                    add = (new String(encData, "UTF-8").trim());

                    getAns.append(add);


}

System.out.println(getAns); 
...
}

它打印在日志猫由第一println语句，while循环中完整的XML文本，但打印的StringBuilder当 getAns ，只打印文本的一部分。

It prints the full XML text in log cat by the first println statement inside while loop, But when printing the StringBuilder getAns, it only prints a part of the text.

我也试着只用字符串：

add = add + (new String(encData, "UTF-8").trim());

也使用的ArrayList＆LT;弦乐方式＆gt; ，但它只能打印文本的一部分

also using ArrayList<String> but it only prints a part of the text.

我想这可能是由于一个愚蠢的错误，但我这个苦苦挣扎。任何帮助将AP preciated。

I guess this may be due to a silly mistake , but I'm struggling with this. Any help will be appreciated.

推荐答案

终于抓住了问题，这是与 System.out.pritnln（），它有一定的限度进行打印。此功能只能在左右时间4060字符打印，我用发现这个 getAns.substring（10000,15000）;

Finally caught the issue, It's with the System.out.pritnln(), It has certain limits for printing. This function can only print around 4060 characters at a time, I've found this by using getAns.substring(10000,15000);.

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