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分享jsp Graphics动态验证码图片在页面显示乱码
<%@ page import="java.awt.image.BufferedImage" %>
<%@ page import="java.awt.*" %>
<%@ page import="java.util.Random" %>
<%@ page import="javax.imageio.ImageIO" %>
<%@ page language="java" pageEncoding="UTF-8" %>
<%@ page contentType="text/html; charset=UTF-8"%>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
//在内存中创建图像
response.setHeader("Cache-Control","no-cache");
int width=60,height=20;
BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
//获取画笔
Graphics g = image.getGraphics();
//设定背景色
g.setColor(Color.BLACK);
g.fillRect(0,0,width,height);
//取随机产生的验证码（4位数）
Random rnd = new Random();
int randNum = rnd.nextInt(8999)+1000;
String randStr = String.valueOf(randNum);
//将验证码存入session
session.setAttribute("randStr",randStr);
//将验证码显示到图像中
g.setColor(Color.BLACK);
Font font = new Font("", Font.PLAIN, 12);
g.setFont(font);
g.drawString(randStr,10,17);
for(int i=0;i<100;i++){
int x = rnd.nextInt(width);
int y = rnd.nextInt(height);
g.drawOval(x,y,1,1);
}
// 输出图像到页面
ImageIO.write(image,"JPEG",response.getOutputStream());
out.clear();
out=pageContext.pushBody();
%>
</body>
</html>
<%@ page import="java.awt.*" %>
<%@ page import="java.util.Random" %>
<%@ page import="javax.imageio.ImageIO" %>
<%@ page language="java" pageEncoding="UTF-8" %>
<%@ page contentType="text/html; charset=UTF-8"%>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
//在内存中创建图像
response.setHeader("Cache-Control","no-cache");
int width=60,height=20;
BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
//获取画笔
Graphics g = image.getGraphics();
//设定背景色
g.setColor(Color.BLACK);
g.fillRect(0,0,width,height);
//取随机产生的验证码（4位数）
Random rnd = new Random();
int randNum = rnd.nextInt(8999)+1000;
String randStr = String.valueOf(randNum);
//将验证码存入session
session.setAttribute("randStr",randStr);
//将验证码显示到图像中
g.setColor(Color.BLACK);
Font font = new Font("", Font.PLAIN, 12);
g.setFont(font);
g.drawString(randStr,10,17);
for(int i=0;i<100;i++){
int x = rnd.nextInt(width);
int y = rnd.nextInt(height);
g.drawOval(x,y,1,1);
}
// 输出图像到页面
ImageIO.write(image,"JPEG",response.getOutputStream());
out.clear();
out=pageContext.pushBody();
%>
</body>
</html>
...全文
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小傻哥 2020-11-30
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<%@ page contentType="text/html; charset=UTF-8"%>
这句解释一下。
网页中输出图片的数据，解析为文本，你告诉我为什么呢？
