HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
org.apache.jsp.isLogin_jsp._jspService(isLogin_jsp.java:77)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.大家帮忙看看把,烦了几天啦~~
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
org.apache.jsp.isLogin_jsp._jspService(isLogin_jsp.java:77)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.大家帮忙看看把,烦了几天啦~~
HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
myapp.User.userExist(User.java:55)
org.apache.jsp.isLogin_jsp._jspService(isLogin_jsp.java:80)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
就会报我的user.java错误,我的user.java是这样的:
package myapp;import java.sql.*;/**
* <p>用户登录管理类</p>
*/
public class User {
private String username; //登录用户名称
private String loginIP; //用户IP private String loginDateTime; //用户登录日期时间
public User() {
username = "";
loginIP = "";
loginDateTime = "";
} public String getUsername() {
return username;
} public void setUsername(String user) {
username = user;
} public String getLoginIP() {
return loginIP;
} public void setLoginIP(String userIP) {
loginIP = userIP;
} public String getLoginDateTime() {
return loginDateTime;
} public void setLoginDateTime(String currentDateTime) {
loginDateTime = currentDateTime;
} //检查用户是否存在
public boolean userExist(String username) {
Connection con = null;
Statement stmt = null;
PreparedStatement ps = null;
ResultSet rs = null;
boolean exist = false;
String sql = "select * from userLogin where username=?"; //构造查询sql语句
DBConnection dbConnection = new DBConnection();
dbConnection.getConnection();
try {
con = dbConnection.con;
ps = con.prepareStatement(sql);
ps.setString(1, username);
rs = ps.executeQuery();
if (!rs.next()) {
exist = true;
}
}
catch (SQLException e) {
e.printStackTrace();
}
finally {
dbConnection.closeConn();
}
return exist;
} //判断用户是否合法
public boolean isValidUser(String username, String password) {
Connection con = null;
Statement stmt = null;
PreparedStatement ps = null;
ResultSet rs = null;
boolean isValid = false;
String sql = "select * from userLogin where username=? and password=?"; //构造查询sql语句
DBConnection dbConnection = new DBConnection();
dbConnection.getConnection();
try {
con = dbConnection.con;
ps = con.prepareStatement(sql);
ps.setString(1, username);
ps.setString(2, password);
rs = ps.executeQuery();
if (rs.next()) {
isValid = true;
}
}
catch (SQLException e) {
e.printStackTrace();
}
finally {
dbConnection.closeConn();
}
return isValid;
} //获取用户编号ID
public int userID(String username, String password) {
Connection con = null;
Statement stmt = null;
PreparedStatement ps = null;
ResultSet rs = null;
int id = 0;
String sql = "select id from userLogin where username=? and password=?"; //构造查询sql语句
DBConnection dbConnection = new DBConnection();
dbConnection.getConnection();
try {
con = dbConnection.con;
ps = con.prepareStatement(sql);
ps.setString(1, username);
ps.setString(2, password);
rs = ps.executeQuery();
if (rs.next()) {
id = rs.getInt("id");
}
}
catch (SQLException e) {
e.printStackTrace();
}
finally {
dbConnection.closeConn();
}
return id;
} //获取用户权限
public String userRights(String username, String password) {
Connection con = null;
Statement stmt = null;
PreparedStatement ps = null;
ResultSet rs = null;
String rights = null;
String sql = "select rights from userLogin where username=? and password=?"; //构造查询sql语句
DBConnection dbConnection = new DBConnection();
dbConnection.getConnection();
try {
con = dbConnection.con;
ps = con.prepareStatement(sql);
ps.setString(1, username);
ps.setString(2, password);
rs = ps.executeQuery();
if (rs.next()) {
rights = rs.getString("rights");
}
}
catch (SQLException e) {
e.printStackTrace();
}
finally {
dbConnection.closeConn();
}
return rights;
} //记录用户登录信息
public void setUserLoginInfo(String currentDateTime, String userIP,
String username) {
Connection con = null;
Statement stmt = null;
PreparedStatement ps = null;
ResultSet rs = null;
String sql =
"update userLogin set loginDateTime = ? ,loginIP= ? where username = ?"; //构造更新sql语句
DBConnection dbConnection = new DBConnection();
dbConnection.getConnection();
try {
con = dbConnection.con;
ps = con.prepareStatement(sql);
ps.setString(1, currentDateTime);
ps.setString(2, userIP);
ps.setString(3, username);
ps.executeUpdate();
}
catch (SQLException e) {
e.printStackTrace();
}
finally {
dbConnection.closeConn();
}
} //记录用户登录日志(登录)
public void saveUserLoginLog(String username, String loginDateTime) {
Connection con = null;
Statement stmt = null;
PreparedStatement ps = null;
ResultSet rs = null;
String sql = "insert into userLoginLog(username,loginDateTime) values(?,?)"; //构造插入sql语句
DBConnection dbConnection = new DBConnection();
dbConnection.getConnection();
try {
con = dbConnection.con;
ps = con.prepareStatement(sql);
ps.setString(1, username);
ps.setString(2, loginDateTime);
ps.executeUpdate();
}
catch (SQLException e) {
e.printStackTrace();
}
finally {
dbConnection.closeConn();
}
} //记录用户登录日志(退出)
public void saveUserLoginOutLog(String loginOutDateTime, String username) {
Connection con = null;
Statement stmt = null;
PreparedStatement ps = null;
ResultSet rs = null;
String sql =
"update userLoginOut set loginOutDateTime = ? ,where username = ?"; //构造更新sql语句
DBConnection dbConnection = new DBConnection();
dbConnection.getConnection();
try {
con = dbConnection.con;
ps = con.prepareStatement(sql);
ps.setString(1, loginOutDateTime);
ps.setString(2, username);
ps.executeUpdate();
}
catch (SQLException e) {
e.printStackTrace();
}
finally {
dbConnection.closeConn();
}
} //获取当前日期时间
public String getCurrentDateTime() {
String loginDateTime = null;
java.util.Date DateTime = new java.util.Date(); //设置日期时间格式
java.text.SimpleDateFormat currentDateTime = new java.text.SimpleDateFormat(
"yyyy-MM-dd hh:mm:ss");
loginDateTime = currentDateTime.format(DateTime); //获取当前日期时间
return loginDateTime;
}
}谢谢帮忙看看把