最近使用JAVAWEB搭建了一个简易的购物系统，基本上是课堂学的，但也加了不少系统，因为oracle还在学，所以数据库使用数组仿真。
首先是预览图
生成验证码
package abc;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/verify")
public class verify extends HttpServlet {
private static final long serialVersionUID = 1L;
private int imageType;
private final int Height=30;
private final int Width=120;
public verify() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
BufferedImage img = new BufferedImage(Width,Height,BufferedImage.TYPE_INT_RGB);
Graphics2D g=(Graphics2D)img.getGraphics();
g.fillRect(0, 0, Width, Height);
g.setColor(Color.blue);
g.drawRect(0, 0, Width, Height);
String base="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
Random r=new Random();
int m=20;
g.setFont(new Font("宋体",Font.BOLD,18));
String verify="";
for(int i=1;i<=4;i++){
int index=r.nextInt(base.length());
int degree=r.nextInt(60)-30;
double theta=degree*(Math.PI/180);
g.rotate(theta,m,20);
String temp=base.charAt(index)+"";
g.drawString(temp, m, 20);
g.rotate(-theta,m,20);
m+=20;
verify+=temp;
}
request.getSession().setAttribute("verify",verify);
System.out.println(request.getSession().getAttribute("verify"));
g.setColor(Color.gray);
for(int i=0;i<8;i++){
int x1,x2,y1,y2;
x1=r.nextInt(Width);
y1=r.nextInt(Height);
x2=r.nextInt(Width);
y2=r.nextInt(Height);
g.drawLine(x1, y1, x2, y2);
}
ImageIO.write(img, "jpg", response.getOutputStream());
}
}
注册后台处理页
package abc;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/reg")
public class reg extends HttpServlet {
private static final long serialVersionUID = 1L;
public reg() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String verify=request.getParameter("verify").toUpperCase();
String verify2=(String)request.getSession().getAttribute("verify");
PrintWriter out=response.getWriter();
int stateA=0,stateB=0;
if(verify==null){stateA=1;}
if(verify2==null){stateA=2;}
if(verify.equals(verify2)){stateA=3;}else{stateA=4;}
if(check(request, response)){stateB=5;}else{stateB=6;}
switch(stateA){
case 1:out.print("<h3>您输入的验证码为空，请检查后输入</h3>");break;
case 2:out.print("<h3>验证码生成失败，无法校验</h3>");break;
case 3:out.print("<h3>验证码输入正确</h3>");break;
case 4:out.print("<h3>验证码输入错误</h3>");break;}
switch(stateB){
case 5:out.print("<h3>密码输入一致</h3>");break;
case 6:out.print("<h3>密码输入不一致</h3>");break;}
if(stateA==3&&stateB==5){
String username=request.getParameter("username");
String password=request.getParameter("password");
String password2=request.getParameter("password2");
String[] habbies=request.getParameterValues("habbies");
String province=request.getParameter("province");
out.println("用户名:"+username+"
");
out.println("密码:"+password+"
");
out.println("确认密码:"+password2+"
");
out.print("爱好:");
if(habbies!=null){
for(int i=0;i
");
request.getSession().setAttribute("name",username);
request.getSession().setAttribute("pw",password);
out.println("<h3>信息已保存，您可以<a href='login.jsp'>登陆</a></h3>");
}else{
out.print("程序发生一个或多个错误，无法显示和保存数据！请<a herf='reg.jsp'>返回</a>");
}
}
static boolean check(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
if(request.getParameter("password").equals(request.getParameter("password2"))){return true;}
return false;
}
}
注册前台页
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
<Script language="javascript">
function changeImg(){
document.getElementById("image").src="verify";
}
</Script>
</head>
<body>
<form method="post" action=reg>
<table border="1">
<tr><td>用户名</td><td><input name="username"></input></td></tr>
<tr><td>密 码</td><td><input type="password" name="password"></input></td></tr>
<tr><td>确认密码</td><td><input type="password" name="password2"></input></td></tr>
<tr><td>爱 好</td><td><input type="checkbox" name="habbies" value="阅读"></input>阅读
<input type="checkbox" name="habbies" value="写字"></input>写字
<input type="checkbox" name="habbies" value="打球"></input>打球</td></tr>
<tr><td>籍贯</td><td><select name="province"><option>上海</option><option>北京</option><option>南京</option><option>广州</option><option>武汉</option></select></td></tr>
<tr>
<td>验证码</td>
<td><img src="verify" id="image" onclick="changeImg()" ></td>
</tr>
<tr><td>填写验证码</td><td><input name="verify" onblur="checkVerify()"></input></td></tr>
<tr><td colspan=2><button type="submit" name="submit">提交</button>
<button type="reset" name="reset">重置</button></td></tr>
</table>
</form>