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java---验证码技术演示网页显示(XML 网页 javaservlet)

2016-07-19 00:07 495 查看

XMLDoucoument

<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>imgServlet2</servlet-name>
<servlet-class>cn.hncu.img.ImageServlet2</servlet-class>
</servlet>

<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>imgServlet2</servlet-name>
<servlet-class>cn.hncu.img.ImageServlet2</servlet-class>
</servlet>

</pre><pre code_snippet_id="1769896" snippet_file_name="blog_20160719_2_2374124" name="code" class="html">java代码

package cn.hncu.img;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ImageServlet2 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//告诉客户端,输出格式
response.setContentType("image/jpeg");  //※※※

int width = 80;
int height = 40;
BufferedImage img = new BufferedImage(width, height ,BufferedImage.TYPE_INT_RGB );
Graphics g = img.getGraphics();

//设置背景色
g.setColor(Color.white);
g.fillRect(0, 0, width, height);//画背景

//设置字体
g.setFont( new Font("黑体",Font.BOLD,18));

//随机数字
Random r = new Random();
for(int i=0;i<4;i++){
int a = r.nextInt(10);
int y =10+ r.nextInt(20); //10~30范围内的一个整数，作为y坐标
Color c = new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255));
g.setColor(c);
g.drawString(""+a, 5+i*width/4, y);
}
//干扰线
for(int i=0;i<10;i++){
Color c = new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255));
g.setColor(c);
g.drawLine(r.nextInt(width), r.nextInt(height), r.nextInt(width), r.nextInt(height));
}

g.dispose();//类似于流中的close()带动flush()---把数据刷到img对象当中

ImageIO.write(img, "JPEG", response.getOutputStream());//※※※

}

}

<head>
<body>
<img id="imgid" src="/HelloWeb/servlet/imgServlet2"><a href="javascript:changeImg()">看不清</a>
</body>

</head>

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