最近在学Struts2，有一个题目是使用Struts2写一个有验证码的登陆界面。但是怎么试验证码都出不来，麻烦各位大神帮我解决下。谢谢。
登陆界面
LoginValidateAction.java
package cn.edu.xmut.action;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class LoginValidateAction extends ActionSupport
{
/**
*
*/
private static final long serialVersionUID = 1L;
private String checkCode;
public String getCheckCode()
{
return checkCode;
}
public void setCheckCode(String checkCode)
{
this.checkCode = checkCode;
}
@Override
public String execute() throws Exception
{
return SUCCESS;
}
@Override
public void validate()
{
HttpSession session = ServletActionContext.getRequest().getSession();
String checkCode2 = (String)session.getAttribute("checkCode");
if(!checkCode.equals(checkCode2))
{
this.addActionError("输入的验证码不正确，请重新输入！");
}
}
}
CreateImageAction.java
package cn.edu.xmut.action;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class CreateImageAction extends ActionSupport
{
/**
*
*/
private static final long serialVersionUID = 1L;
private ByteArrayInputStream inputStream;
private static int WIDTH = 60;
private static int HEIGHT = 20;
public ByteArrayInputStream getInputStream()
{
return inputStream;
}
public void setInputStream(ByteArrayInputStream inputStream)
{
this.inputStream = inputStream;
}
private static String createRandom()
{
String str = "0123456789qwertyuiopasdfghjklzxcvbnm";
char[] rands = new char[4];
Random random = new Random();
for (int i = 0; i < 4; i++)
{
rands[i] = str.charAt(random.nextInt(36));
}
return new String(rands);
}
private void drawBackground(Graphics g)
{
// 画背景
g.setColor(new Color(0xDCDCDC));
g.fillRect(0, 0, WIDTH, HEIGHT);
// 随机产生 120 个干扰点
for (int i = 0; i < 120; i++)
{
int x = (int) (Math.random() * WIDTH);
int y = (int) (Math.random() * HEIGHT);
int red = (int) (Math.random() * 255);
int green = (int) (Math.random() * 255);
int blue = (int) (Math.random() * 255);
g.setColor(new Color(red, green, blue));
g.drawOval(x, y, 1, 0);
}
}
private void drawRands(Graphics g, String rands)
{
g.setColor(Color.BLACK);
g.setFont(new Font(null, Font.ITALIC | Font.BOLD, 18));
// 在不同的高度上输出验证码的每个字符
g.drawString("" + rands.charAt(0), 1, 17);
g.drawString("" + rands.charAt(1), 16, 15);
g.drawString("" + rands.charAt(2), 31, 18);
g.drawString("" + rands.charAt(3), 46, 16);
System.out.println(rands);
}
@Override
public String execute() throws Exception
{
HttpServletResponse response = ServletActionContext.getResponse();
// 设置浏览器不要缓存此图片
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
String rands = createRandom();
BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
// 产生图像
drawBackground(g);
drawRands(g, rands);
// 结束图像 的绘制 过程， 完成图像
g.dispose();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
ImageIO.write(image, "jpeg", outputStream);
ByteArrayInputStream input = new ByteArrayInputStream(outputStream
.toByteArray());
this.setInputStream(input);
HttpSession session = ServletActionContext.getRequest().getSession();
session.setAttribute("checkCode", rands);
input.close();
outputStream.close();
return SUCCESS;
}
}
Struts2配置
```
image/jpeg
inputStream
/success.jsp
/login.jsp
# login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<s:submit value="提交"></s:submit>
</s:form>
