JSP页面写法：
<%@ page contentType="text/html; charset=utf-8" language="java" %>
<%@ page import="java.io.*" %>
<%!
int getServerVersion(HttpServletRequest request) {ServletContext application = request.getSession().getServletContext();String info = application.getServerInfo();int version = 8;int a = info.indexOf("/");int b = info.indexOf(".");if (a != -1 && b != -1) {version = Integer.valueOf(info.substring(a + 1, b));}return version;
}String getParameter(HttpServletRequest request, String name) {int version = getServerVersion(request);String value = request.getParameter(name);if (version <= 7 && value != null) {// Tomcat 7及以下需要转换字符编码try {value = new String(value.getBytes("ISO-8859-1"), "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}}return value;
}
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JSP页面</title>
</head><body>
<p>汤姆猫服务器版本: <%= getServerVersion(request) %></p>
<p>
<%
if (getServerVersion(request) <= 7) {// 防止Tomcat 6-7获取post数据时乱码request.setCharacterEncoding("ISO-8859-1");
} else {// 防止Tomcat 8获取post数据时乱码request.setCharacterEncoding("UTF-8");
}
String value = getParameter(request, "get_text");
out.println("get_text=" + value + "<br />");
value = getParameter(request, "post_text");
out.println("post_text=" + value);
%>
</p>
<form id="form1" name="form1" method="get" action=""><label><input name="get_text" type="text" id="textfield" value="浏览器" /></label><label><input type="submit" id="button" value="GET提交" /></label>
</form>
<form id="form2" name="form1" method="post" action=""><label><input name="post_text" type="text" id="textfield2" value="操作系统" /></label><label><input type="submit" id="button2" value="POST提交" /></label>
</form>
</body>
</html>
Servlet页面写法：
package mytest;import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** Servlet implementation class ParamsTest*/
public class ParamsTest extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public ParamsTest() {super();// TODO Auto-generated constructor stub}private int getServerVersion(HttpServletRequest request) {ServletContext application = request.getSession().getServletContext();String info = application.getServerInfo();int version = 8;int a = info.indexOf("/");int b = info.indexOf(".");if (a != -1 && b != -1) {version = Integer.valueOf(info.substring(a + 1, b));}return version;}private String getParameter(HttpServletRequest request, String name) {int version = getServerVersion(request);String value = request.getParameter(name);if (version <= 7 && value != null) {// Tomcat 7及以下需要转换字符编码try {value = new String(value.getBytes("ISO-8859-1"), "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}}return value;}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {if (getServerVersion(request) <= 7) {// 防止Tomcat 6-7获取post数据时乱码request.setCharacterEncoding("ISO-8859-1");} else {// 防止Tomcat 8获取post数据时乱码request.setCharacterEncoding("UTF-8");}// 防止所有Tomcat版本输出网页内容乱码response.setCharacterEncoding("UTF-8");PrintWriter out = response.getWriter();out.println("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">");out.println("<html xmlns=\"http://www.w3.org/1999/xhtml\">");out.println("<head>");out.println("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />");out.println("<title>Servlet页面</title>");out.println("</head>");out.println("<body>");out.println("<p>汤姆猫服务器版本: " + getServerVersion(request) + "</p>");out.println("<p>");String value = getParameter(request, "get_text");out.println("get_text=" + value + "<br />");value = getParameter(request, "post_text");out.println("post_text=" + value);out.println("</p>");out.println("<form id=\"form1\" name=\"form1\" method=\"get\" action=\"\">");out.println(" <label>");out.println(" <input name=\"get_text\" type=\"text\" id=\"textfield\" value=\"浏览器\" />");out.println(" </label>");out.println(" <label>");out.println(" <input type=\"submit\" id=\"button\" value=\"GET提交\" />");out.println(" </label>");out.println("</form>");out.println("<form id=\"form2\" name=\"form1\" method=\"post\" action=\"\">");out.println(" <label>");out.println(" <input name=\"post_text\" type=\"text\" id=\"textfield2\" value=\"操作系统\" />");out.println(" </label>");out.println(" <label>");out.println(" <input type=\"submit\" id=\"button2\" value=\"POST提交\" />");out.println(" </label>");out.println("</form>");out.println("</body>");out.println("</html>");}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet(request, response);}}
