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Daisyiko 2018-03-15
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解决了就是web,xml里面没有配置好
weixin_39909641 2018-03-08
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@WebServlet("/需要的路径") 或者web.xml里面配。
Miracle1216 2018-03-08
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servlet有没有在web.xml里面配置啊
叫我XiaoNi 2018-03-06
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form中action要和web.xml中<url-partten>配置一致
脾气太臭 2018-03-01
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如果你配置文件没有问题的话 找不到对应文件导致404
青青子衿、悠悠我心 2018-03-01
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form表单中的提交地址看看对不对，或者xml文件里面配一下。404就是找不到文件，就是地址的问题
亲爱的Joe 2018-02-25
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web.xml贴下，还有其他配置文件贴下。
可能是你没配置data/LoginServelet
weixin_39670158 2018-02-24
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@WebServlet(自己的路径) 或者web.xml里面配。
hi,你礼貌吗 2018-02-24
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@service
Daisyiko 2018-02-24
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package data;
import java.io.IOException;
import java.sql.ResultSet;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet {
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String toJSP="";
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username=request.getParameter("username");
String password=request.getParameter("password");
String sql="select * from user where username='"+username+"'" +
"&&password='"+password+"'";
JdbcBean jdbc=new JdbcBean();
try{
ResultSet rs=jdbc.query(sql);
if(rs.next()){
request.getRequestDispatcher("success.jsp").forward(request, response);
}
else{
request.getRequestDispatcher("error.jsp").forward(request, response);
}
rs.close();
}
catch(Exception e){
System.out.println("发生查询异常");
}
RequestDispatcher rd=request.getRequestDispatcher(toJSP);
rd.forward(request, response);
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
}
Daisyiko 2018-02-24
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package data;
import java.sql.*;
public class JdbcBean {
private String DBDriver="com.mysql.jdbc.Driver";
private String DBUrl="jdbc:mysql://localhost:3306/test";
private String DBUser="localhost@root";
private String DBPassword="980514";
public Connection conn=null;
public ResultSet rs=null;
public ResultSet query(String sql)throws Exception{
try{
Class.forName(DBDriver);
conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
Statement stmt=conn.createStatement();
rs=stmt.executeQuery(sql);
return rs;
}
catch(SQLException e){
System.out.println(e.getMessage());
}
return null;
}
public void update(String sql)throws Exception{
try{
Class.forName(DBDriver);
conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
Statement stmt=conn.createStatement();
stmt.executeUpdate(sql);
stmt.close();
conn.close();
}
catch(SQLException e){
System.out.println(e.getMessage());
}
}
}
Daisyiko 2018-02-24
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<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'login.jsp' starting page</title>
<script>
function myFunction(){
if(myForm.username.value==""){
alert("用户名不能为空");
}
else if(myForm.password.value==""){
alert("密码不能为空");
}
else{
myForm.submit();
}
}
</script>
</head>
<body>
<form action="data/LoginServlet" method="post" name="myForm">
<center>
<table>
<tr>
<td>用户名</td>
<td><input type="text" name="username"></td>
<td>用户名不能为空</td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password"></td>
<td>密码不能为空</td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="提交" onclick="myFunction()">
<input type="reset" value="取消"></td>
</tr>
</table>
</center>
</form>
</body>
</html>