关于java：URLDecoder：转义（％）模式中的非法十六进制字符 – 对于输入字符串：“＆lt; /”

URLDecoder: Illegal hex characters in escape (%) pattern - For input string: “</”

我在尝试从应用程序生成.pdf文件时遇到此异常。

1	URLDecoder: Illegal hex characters in escape (%) pattern - For input string:....

这是堆栈跟踪

1 2	java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape (%) pattern - For input string:"</" at java.net.URLDecoder.decode(Unknown Source)

这是密码

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StringBuffer outBuffer = new StringBuffer();
//some values are added to outBuffer .
String pdfXmlView = URLDecoder.decode(outBuffer.toString(),"utf-8");

当试图使用URLDecoder.decode()解码时，它抛出了这个异常。我得到了例外的原因，它是因为在OutBuffer中有%字符。

如果有人知道如何解决这个问题，请帮助我。

谢谢。

相关讨论

我在通过网络传输数据时也面临同样的问题。< BR>提供示例代码，引发异常URLDecoder: Illegal hex characters in escape (%)。

传递字符串'Yash %'的Ajax代码示例：

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var encodedData = encodeURIComponent('Yash %');

var xmlhttp = new XMLHttpRequest();
xmlhttp.open("POST","https://yash.ssl.com:8443/ServletApp/test", true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send("data="+encodedData);

xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
console.log("data uploaded successfully ::");
}
};

接受POST请求的Sevlet代码。

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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
System.out.println(" ===== ------ ===== /test |" + request.getParameter("data"));

String networkData = URLDecoder.decode( request.getParameter("data"),"UTF-8");
System.out.println("Ajax call data :"+ networkData);
} catch (Exception ex) {
ex.printStackTrace();
}
}

正如@EDOCX1[3]在解码字符串之前建议的那样，我正在对它进行编码。< BR>Java EDCOX1？4类？The character"%" is allowed but is interpreted as the start of a special escaped sequence.< BR>javascript url函数encodeURI() and encodeURIComponent()。

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// URLDecoder: Illegal hex characters in escape (%) pattern
String stringEncoded = URLEncoder.encode( request.getParameter("data"),"UTF-8");
String networkData = URLDecoder.decode( stringEncoded,"UTF-8");

您可以使用：

1	String stringEncoded = URLEncoder.encode(YOUR_TEXT,"UTF-8");

我使用servlet(黑暗)时遇到了这个问题。

；)

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If you are facing issue only with **%**. Then this would help:

protected static String encoder(String localTopic1){
String localTopic =localTopic1;
try {
StringBuffer tempBuffer = new StringBuffer();
int incrementor = 0;
int dataLength = localTopic.length();
while (incrementor < dataLength) {
char characterAt = localTopic.charAt(incrementor);
int next_char_index = incrementor+1;
int third_index = next_char_index+1;
Character charAt_nextIndex = ' ';
char charAt_thirdIndex = ' ';
String stringAt_nextIndex ="";

if(next_char_index < dataLength){
charAt_nextIndex = localTopic.charAt(next_char_index);
stringAt_nextIndex = charAt_nextIndex.toString();
}
if(third_index < dataLength)
charAt_thirdIndex = localTopic.charAt(third_index);

if (characterAt == '%') {
if(stringAt_nextIndex.matches("[A-F2-9]")){

if(charAt_thirdIndex == ' ' || charAt_thirdIndex == '%'){
tempBuffer.append("<percentage>");
}
else{
tempBuffer.append(characterAt);
}
}
else{
tempBuffer.append("<percentage>");
}

}else {
tempBuffer.append(characterAt);
}
incrementor++;
}
localTopic = tempBuffer.toString();
} catch (Exception e) {
e.printStackTrace();
}
return localTopic;
}

请检查您输入到解码器，已传递到解码器方法的OutBuffer应该是一个编码值，这样就不会发生此问题。