pswreset.java

vb+java实现的图书管理系统

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.bean.util.DbConn;

public class PswReset extends HttpServlet {

	public PswReset() {
		super();
	}

	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		request.setCharacterEncoding("gbk");
		response.setContentType("text/html;charset=gbk");
		PrintWriter out = response.getWriter();
		
		
		String id=request.getParameter("user_id");
		String oldpassword=request.getParameter("user_oldpsw");
		String password=request.getParameter("user_newpsw");
		
		if(id.equals("")||oldpassword.equals("")||password.equals("")){
	    	out.println("<script type=text/javascript>alert('用户名或密码不能为空');history.go(-1);</script>");
	    }
		
	    DbConn conn=new DbConn();
	    String sql="select readerpsw from ReaderInfo where readerId='"+id+"'";
	    String[][] readers=conn.getData(sql);
	    if(readers==null){
		    out.println("<script type=text/javascript>alert('证件号不存在');history.go(-1);</script>");
	    }
	    else if(readers[0][0].equals(oldpassword)){
	    	sql="update readerInfo set readerPsw='"+password+"' where readerId='"+id+"'";
		    int count=conn.update(sql);
			if(count>0){
				out.println("<script type=text/javascript>alert('密码重置成功');</script>");
				out.println("<meta http-equiv=\"refresh\" content=\"0;url=index.jsp?contr=myInfo\">");
			}
	    }
	    else{
		    out.println("<script type=text/javascript>alert('密码错误');history.go(-1);</script>");
	    }
		out.flush();
		out.close();
	}

	public void init() throws ServletException {
		// Put your code here
	}

}