Struts database access

STRUTS 2 DATABASE ACCESS
http://www.tuto rialspo int.co m/struts_2/struts_database _acce ss.htm Co pyrig ht © tuto rials po int.c om
T his chapter will teah you how to access a database using Struts 2 in simple steps. Struts is a MVC framework
and not a database framework but it provides excellent support for JPA/Hibernate integ ration. We shall look at
the hibernate integ ration in a later chapter, but in this chapter we shall use plain old JDBC to access the database.
T he first step in this chapter is to setup and prime our database. I am using MySQL as my database for this
example. I have MySQL installed on my machine and I have created a new database called "struts_tutorial". I
have created a table called log in and populated it with some values. Below is the script I used to create and
populate the table.
My MYSQL database has the default username "root" and "root123" password
CREATE TABLE `struts_tutorial`.`login` (
ùser` VARCHAR( 10 ) NOT NULL ,
`password` VARCHAR( 10 ) NOT NULL ,
`name` VARCHAR( 20 ) NOT NULL ,
PRIMARY KEY ( ùser` )
) ENGINE = InnoDB;
INSERT INTO `struts_tutorial`.`login` (ùser`, `password`, `name`)
VALUES ('scott', 'navy', 'Scott Burgemott');
Next step is to download the MySQL Connector jar file and placing this file in the WEB-INFlib folder of your
project. After we have done this, we are now ready to create the action class.
Create Action:
T he action class has the properties corresponding to the columns in the database table. We have user,
password and name as String attribues. In the action method, we use the user and password parameters to
check if the user exists, if so , we display the user name in the next screen. If the user has entered wrong
information, we send them to the log in screen ag ain. Following is the content of Log inAc tion.java file:
package com.tutorialspoint.struts2;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import com.opensymphony.xwork2.ActionSupport;
public class LoginAction extends ActionSupport {
private String user;
private String password;
private String name;
public String execute() {
String ret = ERROR;
Connection conn = null;
try {
String URL = "jdbc:mysql://localhost/struts_tutorial";
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(URL, "root", "root123");
String sql = "SELECT name FROM login WHERE";
sql+=" user = ? AND password = ?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, user);
ps.setString(2, password);
ResultSet rs = ps.executeQuery();
while (rs.next()) {
name = rs.getString(1);

ret = SUCCESS;
}
} catch (Exception e) {
ret = ERROR;
} finally {
if (conn != null) {
try {
conn.close();
} catch (Exception e) {
}
}
}
return ret;
}
public String getUser() {
return user;
}
public void setUser(String user) {
this.user = user;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Create main pag e:
Now, let us create a JSP file index.jsp to collect the username and password. T his username and password will
be checked ag ainst the database.
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Login</title>
</head>
<body>
<form action="loginaction" method="post">
User:<br/><input type="text" name="user"/><br/>
Password:<br/><input type="password" name="password"/><br/>
<input type="submit" value="Login"/>
</form>
</body>
</html>
Create Views:
Now let us create suc c ess.jsp file which will be invoked in case action returns SUCCESS, but we will have
another view file in case of an ERROR is returned from the action.
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>

<html>
<head>
<title>Successful Login</title>
</head>
<body>
Hello World, <s:property value="name"/>
</body>
</html>
Following will be the view file error.jsp in case of an ERROR is returned from the action.
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Invalid User Name or Password</title>
</head>
<body>
Wrong user name or password provided.
</body>
</html>
Config uration Files:
Finally, let us put everything tog ether using the struts.xml config uration file as follows:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<package name="helloworld" extends="struts-default">
<action name="loginaction"
method="execute">
<result name="success">/success.jsp</result>
<result name="error">/error.jsp</result>
</action>
</package>
</struts>
Following is the content of web.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
>
<display-name>Struts 2</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>

<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
Now, rig ht click on the project name and click Export > WAR File to create a War file. T hen deploy this WAR
in the T omcat's webapps directory. Finally, start T omcat server and try to access URL
http://localhost:8080/HelloWorldStruts2/index.jsp. T his will g ive you following screen:
Enter a wrong user name and password. You should see the net pag e
Now enter sc ott as user name and navy as password. You should see the net pag e

Struts database access

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Struts database access