如何给servlet发送请求

用java.net.URL和java.net.URLConnection
如果你要发post请求,用java.io.PrintWriter往URLConnection的输出流里面写字符串就行了

什么意思？？
可以用HttpRequest类的getParameter(..)方法得到传来的参数还是自己去看看servlet和jsp的书吧

--------------------------------修改别人的注册页面,不要笑...我也难的改,这么长就这么长,自己动手试试吧,楼主.
<HTML><HEAD><TITLE>天下音乐网 >> 新用户注册</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<SCRIPT LANGUAGE="JavaScript"?>
function valid(form)
{
    Var field1=form.UserName;
    Var field2=form.Password;
    Var field3=form.PwdConfirm;
    Var field4=form.Question;
    Var field5=form.Answer;
    Var field6=form.Email;
    Var field7=form.homepage;
    Var field8=form.QQ;
    Var field9=form.msn;

    UserName=field1.value;
    Password=field2.value;
    PwdConfirm=field3.value;
    Question=field4.value;
    Answer=field5.value;
    Email=field6.value;
    homepage=field7.value;
    QQ=field8.value;
    msn=field9.value;

    if(UserName.length==0&<=7)
    {
       alert("The UserName cannot be left blank,not > 8");
       field1.focus();
       return false;
    }
    else if(Password.length==0)
    {
         alert("The Password cannot be left blank");
         field2.focus();
         return false;
    }
    else if(PwdConfirm.length==0)
    {
         alert("The PwdConfirm.length==0)
         field3.focus();
         return false;
    }
    else if(Question.length==0)
    {
         alert("The Question.length==0)
         field3.focus();
         return false;
    }
    else if(Answer.length==0)
    {
         alert("The Answer.length==0)
         field3.focus();
         return false;
    }
    else if(Email.length==0)
    {
         alert("The Email.length==0)
         field3.focus();
         return false;
    }
    else if(homepage.length==0)
    {
         alert("The homepage.length==0)
         field3.focus();
         return false;
    }
    else if(QQ.length==0)
    {
         alert("The QQ.length==0)
         field3.focus();
         return false;
    }
    else if(msn.length==0)
    {
         alert("The msn.length==0)
         field3.focus();
         return false;
    }
}
</SCRIPT>
<STYLE type=text/css>A {
TEXT-DECORATION: none
}
A:hover {
COLOR: #cc0000
}
A:link {
COLOR: #000000
}
A:visited {
COLOR: #000000
}
BODY {
FONT-SIZE: 9pt; BACKGROUND: #e7f7db
}
TD {
FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体
}
INPUT {
BORDER-RIGHT: #007500 1px solid; BORDER-TOP: #007500 1px solid; FONT-SIZE: 9pt; BORDER-LEFT: #007500 1px solid; COLOR: #000000; BORDER-BOTTOM: #007500 1px solid; HEIGHT: 18px; BACKGROUND-COLOR: #ffffff
}
BUTTON {
FONT-SIZE: 9pt; HEIGHT: 20px
}
SELECT {
FONT-SIZE: 9pt; HEIGHT: 20px
}
.border {
BORDER-RIGHT: #007500 1px solid; BORDER-TOP: #007500 1px solid; BORDER-LEFT: #007500 1px solid; BORDER-BOTTOM: #007500 1px solid
}
.border2 {
BACKGROUND: #ffffff; BORDER-BOTTOM: #007500 1px solid
}
.title_txt {
BACKGROUND: url('Skin/5/topBar_bg_20.gif');
}
.title {
BACKGROUND: url('Skin/5/title.gif'); HEIGHT: 22px
}
.tdbg {
BACKGROUND: #ffffff; LINE-HEIGHT: 150%
}
.txt_css {
BACKGROUND: url('Skin/5/txt_css.gif'); HEIGHT: 36px
}
.title_lefttxt {
FILTER: DropShadow(Color=#ffffff, OffX=2, OffY=2, Positive=2)
}
.title_left {
BACKGROUND: url('Skin/5/title_left1.gif'); HEIGHT: 26px
}
.tdbg_left {
BACKGROUND: #e7f7db
}
.title_left2 {
BACKGROUND: #e7f7db; HEIGHT: 8px
}
.tdbg_left2 {
BACKGROUND: url('Skin/5/tdbg_left2.gif'); HEIGHT: 13px
}
.tdbg_leftall {
BORDER-RIGHT: #56b02b 1px solid; BACKGROUND: #e7f7db; BORDER-LEFT: #56b02b 1px solid
}
.title_maintxt {
FILTER: Glow(Color=#ffffff, Strength=3); COLOR: #000000
}
.title_main {
BACKGROUND: url('Skin/5/title_main.gif'); HEIGHT: 22px
}
.tdbg_main {
BACKGROUND: url('Skin/5/tdbg_main2.GIF'); LINE-HEIGHT: 100%
}
.title_main2 {
BACKGROUND: url('Skin/5/maintop.gif'); HEIGHT: 202px
}
.tdbg_main2 {
BACKGROUND: url('Skin/5/tdbg_main3.GIF'); HEIGHT: 27px
}
.tdbg_mainall {
BACKGROUND: url('Skin/5/kt01-p1.GIF');
}
.title_righttxt {
FILTER: DropShadow(Color=#ffffff, OffX=2, OffY=2, Positive=2)
}
.title_right {
BACKGROUND: url('Skin/5/title_right1.gif'); HEIGHT: 26px
}
.tdbg_right {
BACKGROUND: #f2fbeb
}
.title_right2 {
BACKGROUND: url('Skin/5/title_main.gif'); HEIGHT: 22px
}
.tdbg_right2 {
BACKGROUND: url('Skin/5/title_main.gif'); HEIGHT: 22px
}
.tdbg_rightall {
BORDER-RIGHT: #56b02b 1px solid; BORDER-TOP: #56b02b 1px solid; BACKGROUND: #e7f7db; BORDER-LEFT: #56b02b 1px solid; BORDER-BOTTOM: #56b02b 1px solid
}
.topborder {
BACKGROUND-IMAGE: url('Skin/5/topborder.gif')
}
.nav_top {
BACKGROUND-IMAGE: url('Skin/5/nav_top.gif'); HEIGHT: 25px
}
.nav_main {
BACKGROUND: url('Skin/5/nav_main.gif'); LINE-HEIGHT: 150%; HEIGHT: 134px
}
.nav_bottom {
BACKGROUND-IMAGE: url('Skin/5/nav_bottom.gif')
}
.nav_menu {
BACKGROUND: url('Skin/5/nav_menu.gif'); HEIGHT: 24px
}
.menu {
BORDER-RIGHT: 1px; BORDER-TOP: 1px; BORDER-LEFT: 1px; WIDTH: 97%; BORDER-BOTTOM: 1px; BACKGROUND-COLOR: #56b02b
}
TD.MenuBody {
BACKGROUND-COLOR: #e7f7db
}
</STYLE><SCRIPT language=JavaScript type=text/JavaScript>
function HideMenu()
{
}
</SCRIPT><META content="Microsoft FrontPage 5.0" name=GENERATOR></HEAD>
<BODY leftMargin=2 topMargin=0 marginwidth="0" marginheight="0">
<DIV id=menuDiv
style="Z-INDEX: 1000; VISIBILITY: hidden; WIDTH: 1px; POSITION: absolute; HEIGHT: 1px; BACKGROUND-COLOR: #9cc5f8"></DIV>
<TABLE class=tdbg cellSpacing=0 cellPadding=0 width=760 align=center border=0>
  <TBODY>
  <TR class=nav_top>
    <TD>
      <TABLE height=146 cellSpacing=0 cellPadding=0 width="100%" border=0>
        <TBODY>
        <TR></TR></TBODY></TABLE></TD></TR>
  <TR>
    <TD background="../天下音乐网%20%20新用户注册.files/nav_top.gif">
      <TABLE cellSpacing=0 cellPadding=0 width="100%" align=center>
        <TBODY>
        <TR>
          <TD height=4></TD></TR>
        <TR>
          <TD vAlign=center>
            <TABLE cellSpacing=0 cellPadding=0 width="100%" align=center
            border=0>
              <TBODY>
              <TR vAlign=center></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR>
  <TR>
    <TD class=nav_menu>
      <TABLE height=23 width=760 border=0>
        <TBODY>
        <TR></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE class=txt_css cellSpacing=0 cellPadding=0 width=760 align=center
bgColor=#ffffff border=0>
  <TBODY>
  <TR vAlign=center>
    <TD width=46>
      <DIV align=right>
        <IMG height=20 src="../IMG/arrow3.gif"
      width=35 align=absMiddle> </DIV></TD>
    <TD width=556> 您现在的位置：天下音乐<A
      href="http://www.hr168.com/">网</A> >> 新用户注册 </TD>
    <TD align=right width=158>

<SCRIPT language=JavaScript type=text/JavaScript>
var day="";
var month="";
var ampm="";
var ampmhour="";
var myweekday="";
var year="";
mydate=new Date();
myweekday=mydate.getDay();
mymonth=mydate.getMonth()+1;
myday= mydate.getDate();
myyear= mydate.getYear();
year=(myyear > 200) ? myyear : 1900 + myyear;
if(myweekday == 0)
weekday=" 星期日 ";
else if(myweekday == 1)
weekday=" 星期一 ";
else if(myweekday == 2)
weekday=" 星期二 ";
else if(myweekday == 3)
weekday=" 星期三 ";
else if(myweekday == 4)
weekday=" 星期四 ";
else if(myweekday == 5)
weekday=" 星期五 ";
else if(myweekday == 6)
weekday=" 星期六 ";
document.write(year+"年"+mymonth+"月"+myday+"日 "+weekday);
      </SCRIPT>      <SCRIPT src=""></SCRIPT>
      　</TD></TR></TBODY></TABLE>
<TABLE class=border2 height=300 cellSpacing=0 cellPadding=0 width=760
align=center border=0>
  <TBODY>
  <TR>
    <TD class=tdbg_leftall vAlign=top width=180>
      <TABLE style="WORD-BREAK: break-all" cellSpacing=0 cellPadding=0
      width="100%" border=0>
        <TBODY>
        <TR class=title_left>
          <TD align=middle>
            <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
              <TBODY>
              <TR>
                <TD class=title_lefttxt height=18>
                  <DIV
              align=center><STRONG><B>·注册天下音乐网</B></STRONG></DIV></TD></TR></TBODY></TABLE></TD></TR>
        <TR>
          <TD class=tdbg_left vAlign=top height=80>
            <TABLE height="100%" cellSpacing=5 cellPadding=0 width="100%"
            border=0>
              <TBODY>
              <TR>
                <TD
                  vAlign=top><BR><B>  注册步骤</B><BR>  一、阅读并同意协议<FONT
                  color=#ff0000> √ </FONT><BR>  二、填写注册资料<FONT
                  color=#ff0000> → </FONT><BR>  三、完成注册
            </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
      <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
        <TBODY>
        <TR>
          <TD class=tdbg_left>
            <TABLE cellSpacing=0 cellPadding=0 width="100%" align=center
            border=0>
              <TBODY>
              <TR>
                <TD class=title_left2
        height=15></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
      <TABLE width="100%" border=0>
        <TBODY>
        <TR class=title_left>
          <TD class=title_lefttxt>
            <DIV align=center><STRONG><FONT
          size=3>★特别注意★</FONT></STRONG></DIV></TD></TR>
        <TR>
          <TD vAlign=top align=middle>
            <TABLE width="95%" border=0>
              <TBODY>
              <TR>
                <TD vAlign=top><FONT color=#ff0000
              size=2>　</FONT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD>
    <TD width=5></TD>
    <TD vAlign=top align=middle width=575>
      <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
        <TBODY>
        <TR class=title_main>
          <TD>
            <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
              <TBODY>
              <TR>
                <TD class=title_maintxt>
                  <DIV align=center><FONT
              class=en><B>新用户注册

</B></FONT></DIV></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
      <TABLE class=border style="BORDER-COLLAPSE: collapse" borderColor=#ffffff
      cellSpacing=4 cellPadding=2 width="100%" border=0>
        <FORM onSubmit="return valid(this)" action="http://127.0.0.1:8000/prog2webcontext/loginAlias" method=post>
        <TBODY>
        <TR class=tdbg>
          <TD width="43%"><B>用户名：</B><BR>不能超过14个字符（7个汉字）</TD>
          <TD width="57%"><INPUT maxLength=14 size=30 name=UserName> <FONT
            color=#ff0000>*</FONT> </TD></TR>
        <TR class=tdbg>
          <TD width="43%"><B>密码(至少6位)：</B><BR>请输入密码，区分大小写。请不要使用任何类似 '*'、' ' 或
            HTML 字符 </TD>
          <TD width="57%"><INPUT type=password maxLength=12 size=30
            name=Password> <FONT color=#ff0000>*</FONT> </TD></TR>
        <TR class=tdbg>
          <TD width="43%"><STRONG>确认密码(至少6位)：</STRONG><BR>请再输一遍确认</TD>
          <TD width="57%"><INPUT type=password maxLength=12 size=30
            name=PwdConfirm> <FONT color=#ff0000>*</FONT> </TD></TR>
        <TR class=tdbg>
          <TD width="43%"><STRONG>密码问题：</STRONG><BR>忘记密码的提示问题</TD>
          <TD width="57%"><INPUT maxLength=50 size=30 name=Question> <FONT
            color=#ff0000>*</FONT> </TD></TR>
        <TR class=tdbg>
          <TD width="43%"><STRONG>问题答案：</STRONG><BR>忘记密码的提示问题答案，用于取回密码</TD>
          <TD width="57%"><INPUT maxLength=20 size=30 name=Answer> <FONT
            color=#ff0000>*</FONT> </TD></TR>
        <TR class=tdbg></TR>
        <TR class=tdbg>
          <TD
            width="43%"><STRONG>Email地址：</STRONG><BR>请输入有效的邮件地址，这将使您能用到网站中的所有功能</TD>
          <TD width="57%"><INPUT maxLength=50 size=30 name=Email> <FONT
            color=#ff0000>*</FONT></TD></TR>
        <TR class=tdbg>
          <TD width="43%"><STRONG>主页：</STRONG><BR>您的网站地址</TD>
          <TD width="57%"><INPUT maxLength=100 size=30 value=http://
            name=homepage></TD></TR>
        <TR class=tdbg>
          <TD width="43%"><STRONG>QQ号码：</STRONG><BR>请输入你的QQ号码，以便站长和你联系</TD>
          <TD width="57%"><INPUT maxLength=20 size=30 name=QQ></TD></TR>
        <TR class=tdbg>
          <TD width="43%"><STRONG>MSN：</STRONG><BR>请输入你的MSN帐号，以便站长和你联系</TD>
          <TD width="57%"><INPUT maxLength=50 size=30 name=msn></TD></TR>
        <TR class=tdbg align=middle>
          <TD colSpan=2 height=30><INPUT type=submit value=" 注册 " name=Submit2>   <INPUT id=Reset type=reset value=" 清除 " name=Reset> </TD></TR></FORM>
       </TBODY>
       </FORM></TABLE>
      <TABLE cellSpacing=0 cellPadding=0 width="100%" align=center
      bgColor=#ffffff border=0>
        <TBODY>
        <TR>
          <TD vAlign=top align=middle height=15>
            <TABLE cellSpacing=0 cellPadding=0 width="98%" align=center
border=0>
              <TBODY>
              <TR>
                <TD class=tdbg_left2
        height=13></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>    </TD></TR></TBODY></TABLE>
<TABLE cellSpacing=0 cellPadding=0 width=760 align=center bgColor=#ffffff
border=0>
  <TBODY>
  <TR>
    <TD vAlign=top align=middle height=13>
      <TABLE cellSpacing=0 cellPadding=0 width=755 align=center border=0>
        <TBODY>
        <TR>
          <TD class=tdbg_left2
height=13></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE class=topborder cellSpacing=0 cellPadding=0 width=760 align=center
border=0>
  <TBODY>
  <TR align=middle height=22>
    <TD class=title_maintxt>| <A
      onclick="this.style.behavior='url(#default#homepage)';this.setHomePage('http://www.hr168.com');"
      href="http://www.hr168.com/User_Reg.asp?Action=apply&Submit=+%CE%D2%CD%AC%D2%E2+#">设为首页</A> | <A
      href="javascript:window.external.addFavorite('http://www.hr168.com','天下音乐网')">加入收藏</A> | <A
      href="mailto:[email protected]">联系站长</A> | <A
      href="http://www.hr168.com/FriendSite.asp">友情链接</A> | <A
      href="http://www.hr168.com/guestbook.asp">访客留言</A> | <A
      href="http://www.hr168.com/member.asp">会员系统</A> | <A
      href="http://www.hr168.com/Admin_login.asp"
    target=_blank>管理登录</A> | </TD></TR>
  <TR vAlign=bottom align=middle height=20>
    <TD>版权所有 Copyright© 2004 <A
      href="http://www.hr168.com/">天下音乐网</A>        站长：<A
      href="mailto:[email protected]">主席</A>  <FONT
      color=blue>QQ：</FONT><FONT
      color=#0000ff>124889161</FONT>        页面执行时间：93.75毫秒<BR>〖
      天下音乐网　网天下音乐〗</TD></TR></TBODY></TABLE></BODY></HTML>

呵呵，我不是要html代码，要java代码，因为我不可能借助ie等浏览器来执行这段程序

try {

URL url=new URL("http://127.0.0.1:8080/myweb/servlet/Mytest");
URLConnection uconn=url.openConnection();

PrintWriter pw =new PrintWriter(uconn.getOutputStream());
pw.print("name=admin&password=123");


}catch(Exception e){e.printStackTrace();} 上面的代码编译可以通过，执行时出现如下错误：java.net.ProtocolException: cannot write to a URLConnection if doOutput=false -
call setDoOutput(true)
        at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLCo
nnection.java:510)
        at test.main(test.java:12)
Press any key to continue...

兄弟,兄弟,真不好意思,真正的没有发,,我都给你短信了呀...servlet ,现在就发........
package one;
/*
*/
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.sql.*;
import java.sql.*;public class login extends HttpServlet
{
   Connection dbcon;
   public void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
   {
          try
          {
              Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
              dbcon=DriverManager.getConnection("jdbc:odbc:Mymusic","sa","");

              System.out.println("Connection established");

          }
          catch(ClassNotFoundException ex)
          {
              System.out.println("Database driver not found");
              System.out.println(ex.toString());
          }
          catch(Exception ex)
          {
               System.out.println(ex.toString());
          }//end catch

         res.setContentType("text/html");
         PrintWriter out=res.getWriter();
         String UserName=req.getParameter("UserName");
         String Password=req.getParameter("Password");
         String PwdConfirm=req.getParameter("PwdConfirm");
         String Question=req.getParameter("Question");
         String Answer=req.getParameter("Answer");
         String Email=req.getParameter("Email");
         String homepage=req.getParameter("homepabe");
         String QQ=req.getParameter("QQ");
         String msn=req.getParameter("msn");


         int rows=0;
         try
         {
          PreparedStatement prep=dbcon.prepareStatement("insert regist(UserName,Password,PwdConfirm,Question,Answer,Email,homepage,QQ,msn) values (?,?,?,?,?,?,?,?,?)");
          prep.setString(1,UserName);
          prep.setString(2,Password);
          prep.setString(3,PwdConfirm);
          prep.setString(4,Question);
          prep.setString(5,Answer);
          prep.setString(6,Email);
          prep.setString(7,homepage);
          prep.setString(8,QQ);
          prep.setString(9,msn);

          rows=prep.executeUpdate();

         }
         catch(Exception ex)
         {
            System.out.println(ex.toString());
         }
         if(rows==0)
         {
            System.out.println("Error inserting data in the registration table");

         }
         else
       {
           System.out.println("The values have been inserted in teh table successfully");
       }

      try
      {
         out.println("<html>");
         out.println("<head><title>注册成功</title></head>");
         out.println("<doby bgcolor=pink>");
         out.println("欢迎你注册天下音乐网你的注册名是"+UserName);
         out.println("<BR>");
         out.println("现在你成为我们的会员了享受我们的会员服务");
         out.println("</BR>");
         out.println("</body></html>");

      }
      catch(Exception ex)
      {
         System.out.println(ex.toString());
      }
   }
}
运行吧,,部暑,我就不说了...好好看看,根据程序建个表,自己试试..

要是还不明白,给我短消息....我想我应该没发错.......自己再试试,我也不是想发给你HTML的代码....主要还是这个Servlet 的调用还有实现注册功能....
可能有人会骂死我,,,呵呵,俺也是懒那HTML代码,是我下载的一个注册信息页面...所以,这样长...其实这个问题还算简单... 不好意思...

调试易

如何给servlet发送请求

解决方案 »