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login.java:
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
public class login extends httpservlet{
public void doget(httpservletrequest req,httpservletresponse res){
try{
//res.setcharacterencoding("utf-8");
res.setcontenttype("text/html;charset=gbk");
printwriter pw=res.getwriter();
//返回登录界面
pw.print("<html>");
pw.print("<head>");
pw.print("<title>登录界面</title></head>");
pw.print("<body>");
pw.print("<h1>用户登录界面</h1>");
pw.print("<form action='loginpro' method=post>");
pw.print("用户名:<input type=text name=username><br>");
pw.print("密码:<input type=password name=pwd><br>");
pw.print("<input type=submit value=submit>");
pw.print("</body></html>");
}catch(exception e)
{
e.printstacktrace();
}
}
}
loginpro.java:
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
public class loginpro extends httpservlet{
public void dopost(httpservletrequest req,httpservletresponse res){
try{
string user=req.getparameter("username");
string pwd=req.getparameter("pwd");
if(user==null){
user="";
}
if(pwd==null)
{
pwd="";
}
if(user.equals("nicolas")&&pwd.equals("nicolas")){
//用户和密码合法
//res.sendredirect("wel");
// res.setcharacterencoding("gbk");
// printwriter pw=res.getwriter();
// pw.print("恭喜你,登录成功!!");
res.sendredirect("welcome");
}
else{
//不合法进行跳转
res.sendredirect("login");//跳转到登录界面
}
}catch(exception e)
{
e.printstacktrace();
}
}
}
welcome.java:
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
public class welcome extends httpservlet{
public void doget(httpservletrequest req,httpservletresponse res){
try{
res.setcharacterencoding("gbk");
printwriter pw=res.getwriter();
pw.print("welcome,您好");
}catch(exception e)
{
e.printstacktrace();
}
}
}
web.xml
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