How to Set UTF-8 response on doPost() call?

问题

I Am trying to have a JSON response back to the page with UTF-8 data, as it is what i have posted from the Form to my osgi servlet. The Servlet code is as shown below:

import org.json.simple.JSONArray;
    import org.json.simple.JSONObject;    

@SlingServlet(paths="/bin/JsonOsgiCall", methods = "POST", metatype=true)
public class JsonOsgiCall extends org.apache.sling.api.servlets.SlingAllMethodsServlet {
     private static final long serialVersionUID = 2598426539166788515L;
     protected final Logger log = LoggerFactory.getLogger(this.getClass());

     @Override
     protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServerException, IOException {
    response.setContentType("text/html; charset=UTF-8");
    response.setCharacterEncoding("UTF-8");
    request.setCharacterEncoding("UTF-8");
    PrintWriter out = response.getWriter();
    JSONObject jsonobj = new JSONObject();

    try { 

        jsonobj.put("testint", 30);
        jsonobj.put("myjspstring", request.getParameter("userinmsg"));
        jsonobj.put("myjspstati","`İş hayatında ne çok engelle karşılaşıldığını,`");
        JSONArray list = new JSONArray();
        list.add("message 1");
        list.add("message 2");
        jsonobj.put("messages", list);
       log.info("*** JSON Object with ***" + jsonobj.toJSONString());
       //out.println(jsonobj.toJSONString());
       out.println(jsonobj);  
    } 
 catch (Exception e) {
    e.printStackTrace();
}
}
}

And my JSP Form code shown as below:

<%@include file="/libs/foundation/global.jsp"%><%
    %><%@page session="false" %>
    <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
    <%@ page import="org.json.simple.JSONObject,java.io.PrintWriter,java.util.*"%>
    <%
    %>CALL OSGI SERVICE FOR JSON RESPONSE
    <cq:includeClientLib js="granite.csrf.standalone"/>
    <head>
    <meta charset="UTF-8" />
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>Editer les sous-titres</title>
    </head>
    <body>
    <form id="submitForm" method="POST" action="/bin/JsonOsgiCall">
        <textarea name="userinmsg" autocomplete="off" type="text" id="userinmsg" rows="4" cols="30" style="width: 450px; margin-left: 25px;">
        </textarea>
        <br/>

        <p style="margin-left: 420px;"><input name="submitmsg" type="submit"  id="submitmsg" value="Call JSON Service" /></p>

      </form>
    </body>

But when I submit the Form and see the output that has resulted back to the page is like with ANSI format. Where the the JSON data that I have added in the:

jsonobj.put("myjspstati","İş hayatında ne çok engelle karşılaşıldığını,");

In between code snippet is coming fine back to page. But where as the form submitted same code is breaking when it received into servlet with:

request.getParameter(userinmsg)

How can I get the UTF enabled data that can be properly sent to Servlet and can do the JSON object with same.

Debugging in my browser Developer tools Request Headers

Response

回答1:

you can see your charset is being broken(as the ServerSide json data with utf-8 is resulted correct and you have a doubt in your request.getParameter()) when it is getting transferred after form submission.

Try adding <input type="hidden" name="_charset_" value="UTF-8"/> where browser will fill-in the submitted character encoding as the field's value.

Modified your form alone along with hidden input for charset utf-8

<form id="submitForm" method="POST" action="/bin/JsonOsgiCall">
            <textarea name="userinmsg" autocomplete="off" type="text" id="userinmsg" rows="4" cols="30" style="width: 450px; margin-left: 25px;">
            </textarea>
            <br/>
    <input type="hidden" name="_charset_" value="UTF-8"/>
            <p style="margin-left: 420px;"><input name="submitmsg" type="submit"  id="submitmsg" value="Call JSON Service" /></p>

          </form>