servlet又出错了
情况是这样的，做了一个简单的注册功能，昨天都能运行，今天我又写了些其他页面，但是没动注册这边的
运行老是出错，我启动eclipse，第一次运行会出现这个错误：
ava.lang.Error: Unresolved compilation problem:
The import net cannot be resolved
at myservlet.HandleRegister.<init>(HandleRegister.java:15)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at java.lang.Class.newInstance0(Class.java:374)
at java.lang.Class.newInstance(Class.java:327)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1115)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:808)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:722)
再运行一次就出现：
The requested resource (Servlet HandleRegister is not available) is not available.
源代码是：
package myservlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.wsc.bean.Register;
public class HandleRegister extends HttpServlet{
/**
*
*/
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
doPost(request,response);
}
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
response.setContentType("text/html; charset=UTF-8");
PrintWriter out=response.getWriter();
request.setCharacterEncoding("GB2312");
String username =request.getParameter("username");
String password =request.getParameter("password");
String email =request.getParameter("email");
String backnews="";
Register reg=new Register();
request.setAttribute("register",reg);
try{
Connection conn=null;
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String strConn="jdbc:sqlserver://localhost:1433;DatabaseName=Goods;characterEncoding=GB2312";
String strUser="sa";
String strPassword="wsc550246215";
conn =DriverManager.getConnection(strConn,strUser,strPassword);
Statement stm=conn.createStatement();
String sql="insert into dl values('"+username+"','"+password+"','"+email+"')";
int n =stm.executeUpdate(sql);
if(n!=0){
backnews="注册成功";
reg.setBackNews(backnews);
reg.setUserName(username);
reg.setPassworid(password);
reg.setEmail(email);
}else{
backnews="已被注册，请更换用户名";
reg.setBackNews(backnews);
stm.close();
conn.close();
}
}catch(ClassNotFoundException e){
backnews="添加失败"+e;
reg.setBackNews(backnews);
}
catch(SQLException e){
backnews="数据库连接错误"+e;
reg.setBackNews(backnews);
}
out.print("<script Language='JavaScript'>window.location='show2.jsp'</script>");
}
}
看看那个Jre上面有没有一个 X
[解决办法]
先看看你的java build path 里面的jar 是否真确？
个人签名:健康宝宝
[解决办法]
