java - 如何获取html属性值？

Question

我想获取 HTML 代码中“value ”属性的值，其中 class = validated 并将其保存到变量“variationID ”中。我如何使用java编写代码？

以下是 HTML 代码的一部分:

<input id="942981037_3-4" type="text" size="35" value="533" data-valid="-0123456789" class="validated"/>

此处附加文件:https://gofile.io/?c=mNiVcB

这是我创建的初始代码:

String html = prev.getResponseDataAsString(); // get response from your sampler
String variationID;
Integer b;
for (int i = -1; (i = html.indexOf("class=\"validated\"", i + 1)) != -1; i++) {
    b = i;
}
b=b-30;
variationID = html.substring(b,b+3);
int res = Integer.parseInt(variationID) + 1;
variationID = res.toString();
log.info(variationID);

Answer 1

为什么不使用正则表达式呢？您可以简单地编写正则表达式来从输入标记中提取属性。请引用下面的代码来提取属性的值。

    String html = prev.getResponseDataAsString(); // get response from your sampler
    String variationID;

    // Pattern for finding input tag with class validated
    String input = "<input id=\"942981037_3-4\" type=\"text\" size=\"35\" value=\"533\" data-valid=\"-0123456789\" class=\"validated\"/>";
    // Compiling the pattern
    Pattern pattern = Pattern.compile("\\<input.*(class=\".*validated.*\")?.*value=\"([\\w\\d]+)?\".*(class=\".*validated.*\")?.*/\\>");
    // Passing the input string to the pattern to start matching
    Matcher matcher = pattern.matcher(input);

    // Iterate through all the matches in given string
    while(matcher.find()) {
        // If a match is found value will be found in group 2
        variationID = matcher.group(2);
    }