如何在jsp中打印多维数组值？

Question

In PHP Page, to print array, we use print_r(); In jsp, to print string, out.print() is used. for example :

<?php print_r($_POST); ?>

was is equal in jsp??? How can we print array values in jsp?

Answer 1

you can try

ObjectMapper mapper = new ObjectMapper();
 System.out.println( mapper.defaultPrettyPrintingWriter().writeValueAsString(myList) );

myList is your array varible .

or for post data try

Map<String, String[]> parameters = request.getParameterMap();
for(String parameter : parameters.keySet()) {
    if(parameter.toLowerCase().startsWith("your object name in html")) {
        String[] values = parameters.get(parameter);
        //your code here
    }
}

and import java.util.Map