Chinese garbage problem after JavaWeb / forward jump to the jsp page

　　

  Code in question:

dispatcher = getServletContext().getRequestDispatcher("/Login.jsp");

dispatcher.forward(request,response);

There is a problem:
 after the jump past Chinese garbled.

To solve the problem:
 Use

response.setContentType ( "text / html; charset = UTF-8"); to solve

problem causes:

Use the PrintWriter out = response.getWriter (); 
As for what the principle is not clear