Servlet请求参数编码处理（POST & GET）

小巧，但在中文语境下，还是要注意的。

以下是关键语句，注意转码的先后顺序，这源于GET是HTTP服务器处理，而POST是WEB容器处理：

String name = request.getParameter("nameGet");
name = new String(name.getBytes("ISO-8859-1"), "gb2312");

================================

request.setCharacterEncoding("gb2312");
String name = request.getParameter("namePost");

package cc.openhome;

import java.io.IOException;
import java.io.BufferedReader;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/encoding")
public class EncodingServlet extends HttpServlet{
  protected void doGet(HttpServletRequest request,
                      HttpServletResponse response)
                      throws ServletException, IOException {
    String name = request.getParameter("nameGet");
    name = new String(name.getBytes("ISO-8859-1"), "gb2312");
    System.out.println("GET: " + name);
  }

  protected void doPost(HttpServletRequest request,
                      HttpServletResponse response)
                      throws ServletException, IOException {
    request.setCharacterEncoding("gb2312");
    String name = request.getParameter("namePost");
    System.out.println("POST: " + name);
    String body = readBody(request);
    System.out.println("Body: " + body);
                      }
    private String readBody(HttpServletRequest request)
                        throws IOException{
    BufferedReader reader = request.getReader();
    String input = null;
    String requestBody = "";
    while((input = reader.readLine()) != null) {
      requestBody += input;
    }
    return requestBody;
                        }
}