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验证码出不来好心人帮看看

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粉慕83121

2016-10-26 16:16

jsp

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>My JSP 'index.jsp' starting page</title>

</head>

<body>

验证码:<input type="text" name="checkcode"/>

<img alt="验证码" src="<%=request.getContextPath() %>/servlet/ImageServlet>"/>

</body>

</html>

package checkCode;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.util.Random;

import javax.imageio.ImageIO;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ImageServlet extends HttpServlet {

/**

private static final long serialVersionUID = 1L;

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

BufferedImage bi=new BufferedImage(68,22,BufferedImage.TYPE_INT_RGB);

Graphics g=bi.getGraphics();

Color c= new Color(200,150,255);

g.setColor(c);

g.fillRect(0, 0, 68, 22);

char[] ch="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();

Random r=new Random();

int len=ch.length,index;

StringBuffer sb=new StringBuffer();

for(int i=0;i<4;i++){

index=r.nextInt(len);

g.setColor(new Color(r.nextInt(88),r.nextInt(188),r.nextInt(255)));

g.drawString(ch[index]+"", (i*15)+3, 18);

sb.append(ch[index]);

}

request.getSession().setAttribute("piccode", sb.toString());

ImageIO.write(bi, "JPG", response.getOutputStream());

}

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

<display-name>checkCode</display-name>

<servlet-name>ImageServlet</servlet-name>

<servlet-class>com.muke.ImageServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>ImageServlet</servlet-name>

<url-pattern>/Servlet/ImageServlet</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>index.html</welcome-file>

<welcome-file>index.htm</welcome-file>

<welcome-file>index.jsp</welcome-file>

<welcome-file>default.html</welcome-file>

<welcome-file>default.htm</welcome-file>

<welcome-file>default.jsp</welcome-file>

</welcome-file-list>

</web-app>

写回答关注

1回答

Whaleson

2016-12-14 23:33:55

怎么出不来？截图！

0 0

Java实现验证码制作

本教程就会带大家学习使用java实现各种验证码的方法

59909 学习 · 128 问题

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验证码出不来 好心人帮看看

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