public class User {

Private int id; 
Private String username; 
Private String password; 


Public int getId () {
return id; 
} 

Public void setId (int id) {
this.id=id; 
} 

Public String getUsername () {
Return the username. 
} 

Public void setUsername (String username) {
Enclosing the username=username; 
} 

Public String getPassword () {
Return the password; 
} 

Public void setPassword (String password) {
Enclosing the password=password; 
} 

@ Override 
Public String toString () {
Return the User {" + "
"Id=" + id + 
"And the username='" + username +' \ ' '+ 
"And password='" + password +' \ ' '+ 
'} '; 
} 
} 

 public class UserDao {
/* * 
* login method 
* @ param loginUser only a user name and password 
* @ return user contains all user data, there is no query that returns null 
*/

//declare JDBCTemplate objects share 
Protected the static JdbcTemplate template=new JdbcTemplate (JDBCutil getDataSource ()); 

/* * 
* login method 
* @ param loginUser only a user name and password 
* @ return user contains all user data, there is no query that returns null 
*/
Public static User login (User loginUser) {
Try {
//1. Write SQL 
String SQL="select * from the user where the username=? And password=?" ; 
//2. Call the query method 
User User=template. QueryForObject (SQL, 
New BeanPropertyRowMapper (the User. The class), 
LoginUser. GetUsername (), loginUser. GetPassword ()); 


return user; 
} the catch (DataAccessException e) {
return null; 
} 
} 
} 

/* ** Created by Administrator on 2020/3/16 18:51 
* @ author Administrator 
*/

//used to landing operation interface 
@ WebServlet ("/loginServlet ") 
Public class LoginServlet extends the HttpServlet {


@ Override 
Protected void doGet (it the req, HttpServletResponse resp) throws ServletException, IOException {

//1. Set the coding 
The req. SetCharacterEncoding (" utf-8 "); 
//2. Get request parameter 
String username=the req. GetParameter (" username "); 
String password=the req. GetParameter (" password "); 
//3. Wrap the user object 
The User loginUser=new User (); 
LoginUser. SetUsername (username); 
LoginUser. SetPassword (password); 

//4. Call UserDao login method 
User User=UserDao. Login (loginUser); 

//5. Determine the user 
If (user==null) {
//login failed 
The req. GetRequestDispatcher ("/failServlet "). The forward (the req, resp); 
} else {
//login success 
//store data 
The req. SetAttribute (" user ", the user). 
Forward//
The req. GetRequestDispatcher ("/successServlet "). The forward (the req, resp); 
} 

} 

@ Override 
Protected void doPost (it the req, HttpServletResponse resp) throws ServletException, IOException {
Enclosing doGet (the req, resp); 
} 
} 

//4. Call UserDao login method 
User User=UserDao. Login (loginUser); 

When I Debug the code above program will be terminated and error

 
Java. Lang. ClassNotFoundException: org. Springframework. Dao. DataAccessException 
The at org. Apache. Catalina. Loader. WebappClassLoaderBase. LoadClass (WebappClassLoaderBase. Java: 1358) 
The at org. Apache. Catalina. Loader. WebappClassLoaderBase. LoadClass (WebappClassLoaderBase. Java: 1180) 
At com. Servlet. LoginServlet. DoGet (LoginServlet. Java: 37) 
At com. Servlet. LoginServlet. DoPost (LoginServlet. Java: 55) 

CodePudding user response:

For what I want to create a accept the object will be an error, I am drunk, a great god answer ah

CodePudding user response:

Java. Lang. ClassNotFoundException: org. Springframework. Dao. DataAccessException
Don't have to prompt you, not this class

CodePudding user response:

If it is lack of jar, compile should pass the
May be a jar conflicts,
You still replace DataAccessException, with Exception directly

CodePudding user response:

refer to the second floor from the underlying program apes looked response:

Java lang. ClassNotFoundException: org. Springframework. Dao. DataAccessException
Don't have to prompt you, don't have the class

I guide the JDBC package

CodePudding user response:

I feel there is no dependency injection!!!! Or structural parameters, the set, annotation and new objects, I see you what all not directly define a static method call

CodePudding user response:

You quoted the wrong class, it is to belong to the spring - tx - 4.3.8. The jar
You look at your project whether to have this package, the version number does not agree it doesn't matter
If there is no import, also can be like 3 l said, with the Exception capture