GET the data submitted by GET/POST and handle Chinese problems

1. Obtain the value in the input tag, and use request. getParameter ("User") (User is the name value of input)

2. Get the checkbox value. Because multiple values are selected, you cannot use getParameter. Because getParameter can only get one value, you can use string [] str [request. getParameterValues ("love") to obtain the array, and then use Arrays. toString (str) gets the value selected for checkbox;

3. Processing of submitted Chinese content

When the content submitted in the Get method contains Chinese characters: (only one data can be processed)

 

1 String say = request. getParameter ("say"); // get the value say = % E4 % E82 String str = new String (say. getBytes ("ISO-8859-1"), "UTF-8"); // transcoding, http transport uses ISO-8859-1 encoding, we want to convert to UTF-8 encoding 3 System. out. println (str );

 

 

 

When the content submitted in post mode contains Chinese characters:

Set the encoding directly before obtaining the code (set all the codes once and for all [recommended ])

Request. setCharacterEncoding ("UTF-8 ");

 

Demo

1 System. out. println ("Get"); 2 System. out. println (request. getParameter ("User"); 3 System. out. println (request. getParameter ("Pwd"); 4 System. out. println (request. getParameter ("sex"); 5 System. out. println (Arrays. toString (request. getParameterValues ("love"); 6 7 String say = request. getParameter ("say"); 8 String str = new String (say. getBytes ("ISO-8859-1"), "UTF-8"); 9 System. out. println (str );

1 System. out. println ("post"); 2 3 request. setCharacterEncoding ("UTF-8"); 4 5 System. out. println (request. getParameter ("User"); 6 System. out. println (request. getParameter ("Pwd"); 7 System. out. println (request. getParameter ("sex"); 8 System. out. println (Arrays. toString (request. getParameterValues ("love"); 9 System. out. println (request. getParameter ("say "));

 

1 <form action = "getDataServlet" method = "get"> 2 Username: <input type = "text" name = "User"/> 3 <br/> 4 password: <input type = "password" name = "Pwd"/> 5 <br/> 6 gender: <input type = "radio" name = "sex" checked = "checked" value = "01"/> male 7 <input type = "radio" name = "sex" value = "02"/> Female <br/> 8 Hobbies: <input type = "checkbox" name = "love" value = "o1"/> reading 9 <input type = "checkbox" name = "love" value = "o2"/> swimming 10 <input type = "checkbox" name = "love" value = "o3"/> hitting game 11 <input type = "checkbox" name = "love" value = "o4" /> programming 12 <input type = "checkbox" name = "love" value = "o5"/> Watch Movies 13 <br/> 14 self-evaluation: <textarea rows = "5" cols = "30" name = "say"> </textarea> 15 <br/> 16 <input type = "submit" value = "submit" /> 17 </form>

 

GET the data submitted by GET/POST and handle Chinese problems