进行servlet开发及中文乱码处理 post与get

来源：互联网发布：淘宝模板怎么制作编辑：程序博客网时间：2024/06/05 23:02

开发步骤：

1.新建一个web project,Project Name为FirstFormServlet,j2EE level 选Java EE5.0
2.工程右键选new->Html文件,文件名form.html
3.在form.html的<body></body>间输入
<form action="./FormServlet" method="GET">
<input name="username">
<input type="submit">
</form>
</BR>
<form action="./FormServlet" method="POST">
<input name="username">
<input type="submit">
</form>
4.工程右键－>Myeclips->add and remove deployment,选择Tomcat 6.x或5.x进行发布
5.工程右键，新建一个Servlet，package为servlet,name为FormServlet
6.在弹出的对话框中把Servlet/JSP Mapping URL:改为/FormServlet,确定。

7.在FormServlet.java文件中修改代码
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

   response.setContentType("text/html");
   PrintWriter out = response.getWriter();
   out.println("<!DOCTYPE HTML PUBLIC /"-//W3C//DTD HTML 4.01 Transitional//EN/">");
   out.println("<HTML>");
   out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
   out.println(" <BODY>");
   out.print("你输入的用户名:");
   out.print(request.getParameter("username"));
   out.println(", using the POST method");
   out.println(" </BODY>");
   out.println("</HTML>");
   out.flush();
   out.close();
}
8.修改代码后重新发布，在Servers面板,FirstFormServlet工程右键或工程中右键->Myeclipse->.
9.浏览器中输入：http://localhost:8080/FirstFormServlet/form.html
在get:文本框中输入用户名:梦里香巴拉，提交
发现中文是乱码，在FormServlet.java文件doGet()及doPost()中修改
response.setContentType("text/html");为response.setContentType("text/html;charset=GBK");
10.修改代码后重新发布，及测试。(server面板，Browser可以打开看发布情况)
11.发现post方法的乱码仍存在。
在doPost()中修改为
   request.setCharacterEncoding("GBK");
   //response.setContentType("text/html");
   response.setContentType("text/html;charset=GBK");
12.输入"张三"使用post，发现还有乱码。这是因为form.html中的编码为"utf-8"
改为 <meta http-equiv="content-type" content="text/html; charset=GBK">
13.在doGet()中 request.setCharacterEncoding("GBK");乱码还存在。使用GET方法编码转换。
改为    out.print("你输入的用户名:");
   String username=request.getParameter("username");
   username =new String(username.getBytes("ISO8859-1"),"GBK");
   out.print(username);
14.输入中文名，测试doGet(),doPost都无乱码。
15.最终的代码如下：
public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
   request.setCharacterEncoding("GBK");
   response.setContentType("text/html;charset=GBK");
   PrintWriter out = response.getWriter();
   out.println("<!DOCTYPE HTML PUBLIC /"-//W3C//DTD HTML 4.01 Transitional//EN/">");
   out.println("<HTML>");
   out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
   out.println(" <BODY>");
   out.print("你输入的用户名:");
   //GET方法代码转换
   String username=request.getParameter("username");
   username =new String(username.getBytes("ISO8859-1"),"GBK");
   out.print(username);
   out.println(", using the GET method");
   out.println(" </BODY>");
   out.println("</HTML>");
   out.flush();
   out.close();
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
   request.setCharacterEncoding("GBK");
   //response.setContentType("text/html");
  response.setContentType("text/html;charset=GBK");
   PrintWriter out = response.getWriter();
   out.println("<!DOCTYPE HTML PUBLIC /"-//W3C//DTD HTML 4.01 Transitional//EN/">");
   out.println("<HTML>");
   out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
   out.println(" <BODY>");
   out.print("你输入的用户名:");
   out.print(request.getParameter("username"));
   out.println(", using the POST method");
   out.println(" </BODY>");
   out.println("</HTML>");
   out.flush();
   out.close();
}

16.注意html文件中<form action="./Formservlet">要和web.xml文件配置中 <url-pattern>相一致，否则会出错：scription The requested resource (FormServlet) is not available.

<servlet-mapping>
<servlet-name>FormServlet</servlet-name>
<url-pattern>/FormServlet</url-pattern>
</servlet-mapping>

<form action="./FormServlet" method=...>