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ImageCodeServlet.java

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package com.servlet;

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.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet("/servlet/ImageCodeServlet")

public class ImageCodeServlet extends HttpServlet{

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

req.setCharacterEncoding("utf-8");

resp.setCharacterEncoding("utf-8");

/**

* 生成带字符串的文本图片

*/

// 1.创建图片缓存区 传参为宽高和图片类型

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

// 2.创建绘制环境（拿到画笔）

Graphics paint = image.getGraphics();

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

// 设置画笔

paint.setColor(c);

// 画背景

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

StringBuffer codes = new StringBuffer();

// 设置文本

char[] ch = "QWERTYUIOPASDFGHJKLZXCVBNM1234567890".toCharArray();

Random r = new Random(); //随机数

int index;

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

index = r.nextInt(ch.length);//随机数位置

paint.setColor(new Color(r.nextInt(88),r.nextInt(150),r.nextInt(255))); //设置文本颜色

// 使用此图形上下文的当前字体和颜色绘制由指定 string 给定的文本。

paint.drawString(ch[index]+"", (i*16)+3, 18);

codes.append(ch[index]);

}

req.getSession().setAttribute("codes", codes);

// 3.输出图片

ImageIO.write(image, "JPG", resp.getOutputStream());

}

}