loginsystemimpl.java

来自「利用google开发的GWT工具」· Java 代码 · 共 161 行

package org.gjj.gwt.server;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.LinkedList;

import net.sf.jpam.*;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;

import org.gjj.gwt.client.LoginSystem;
import org.gjj.gwt.client.ResultOfReturn;

public class LoginSystemImpl extends RemoteServiceServlet implements LoginSystem {
	
	/**
	 * implement abstract method isValid(),authentic user's ID
	 * @author gaojinjun
	 * @return boolean
	 */
	public boolean isValid(String userName, String password){
		//return this.jpam(userName, password);
		return true;
	}
	
	/**
	 * implement abstract method getOutput(String post), get output of post command
	 * @author gaojinjun 
	 */
	public ResultOfReturn getOutput(String post){
		return this.postResult(post);
	}
	
	/**
	 * db conn
	 * 
	 * Make sure you add a reference library (external jar in build path) JDBC Connector - 
	 * You will see I put it in /opt/gwt-linux/mysql-connector-java-5.0.8-bin.jar
	 * 
	 * @return Connection
	 */
	private Connection getConn() {
	
		    Connection conn	= null;
		    String url 		= "jdbc:mysql://localhost:3306/";
		    String db 		= "test1";
		    String driver 	= "com.mysql.jdbc.Driver";
		    String user 	= "root";
		    String pass 	= "gaojinjun07";
		    System.out.println("connecting");
		    try {
		      
		    	Class.forName(driver).newInstance();
		    	conn = DriverManager.getConnection(url+db, user, pass);
		      
		    } catch (Exception e) {
		    	
		    	//error
		    	System.err.println("Mysql Connection Error: ");
		    	//e.printStackTrace();
		    }
		
		    return conn;
	}
	
	
	/*
	 * get row count
	 */
	protected static int getResultSetSize(ResultSet resultSet) {
	    int size = -1;

	    try {
	        resultSet.last();
	        size = resultSet.getRow();
	        resultSet.beforeFirst();
	    } catch(SQLException e) {
	        return size;
	    }

	    return size;
	}
	
	/**
	 * method to test query
	 */
	public boolean queryMyDB(String userName, String password) {
		
		boolean flag = false;
	    String Query = "select * from user;";
	        
	    try {
	        Connection connection = this.getConn();
	        Statement select = connection.createStatement();
	        ResultSet result = select.executeQuery(Query);
	        //get count so I can set my array to the right length
	        int rsSize = getResultSetSize(result); 
	        
	        while (result.next()) {
	        		if (result.getString(1).equals(userName) && result.getString(2).equals(password)){
	        			flag = true;
	        			break;
	        		}
	        }
	        connection.close();
	    } catch(Exception e) {
	        
	        //debug out output this way
	        System.err.println("Mysql Statement Error: " + Query);
	        e.printStackTrace();
	        
	    }
	    System.out.println(flag);
	     return flag;   
	}
	
	/**
	 * use Jpam to authenticate users
	 * @author gaojinjun
	 * @return boolean
	 */
	public boolean jpam(String userName, String password){
		System.out.println(userName+password);
		boolean flag = false;
		Pam pam = new Pam();
		flag = pam.authenticateSuccessful(userName, password);
		return flag;
	}
	
	/**
	 * run system call, execute command of post, which is front end transforms to here
	 * @author gaojinjun
	 * @return String[] 
	 */
	private ResultOfReturn postResult(String post){

		String str = null;
		LinkedList<String> result = new LinkedList<String>();
		ResultOfReturn ret = new ResultOfReturn();
		Runtime run = Runtime.getRuntime();
		Process process = null;
		try{
			process = run.exec(post);
			BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
			while(null != (str = br.readLine())){
				System.out.println(str);
				result.add(str);
			}
		}
		catch(java.io.IOException e){
			System.out.println("Error while run " + post);
		}
		ret.setResult(result.toArray(new String[0]));
		return ret;
	}
}