About the output stream _ajax related to the end of the servlet in Ajax technology

When the AJAX server side responds to data with PrintWriter Out=resp.getwriter (), Out.print (0), Out.print (1) indicate success or failure, Without out.write There is a reason, first look at print and write the similarities and differences between the two points.

In common: both do not refresh the page, only the original page to write data. Ultimately, they rewrite the write method in the abstract class writer.

The difference is that the Print method can convert various types of data to a string of output. The overloaded write method can output only characters, character arrays, strings, and other character-related data.

So the difference between the two is not hard to find, in the page's JS code in the set callback function, is the value returned from the server to determine what the display, if the server-side servlet in the last output of the number, and the use of writ will not convert the number to the form of a string output, This results in a bad judgment of the return value in the page.

The above is a small set to introduce the AJAX technology in the end of the servlet output stream, I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!