login.jsp页面显示验证码图片
验证码：<s:textfield name="rand" size="5"></s:textfield>
<img src="random.action" οnclick="changeValidateCode(this)" title="点击图片刷新验证码"/>
function changeValidateCode(obj){
var timenow = new Date().getTime();
obj.src="random.action?date="+timenow;
}
配置random.xml，设置图片流格式
<action name="random" class="com.action.RandomAction">
<result type="stream">
<param name="contentType">image/jpeg</param>
<param name="inputName">inputStream</param>
</result>
</action>
RandomAction.java
public class RandomAction extends ActionSupport {
private ByteArrayInputStream inputStream;
public String execute() throws Exception{
RandomNumUtil random = RandomNumUtil.Instance();
inputStream = random.getImage();
ServletActionContext.getContext().getSession().put("random", random.getStr());
return SUCCESS;
}
}
Random工具类：RandomNumUtil.java
public class RandomNumUtil {
private ByteArrayInputStream image;
private String str;
public static RandomNumUtil Instance() {
return new RandomNumUtil();
}
public RandomNumUtil() {
init();
}
private void init() {
int width=85, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
g.setColor(getRandColor(160,200));
for (int i=0;i<155;i++)
{
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x,y,x+xl,y+yl);
}
String sRand="";
for (int i=0;i<6;i++){
String rand=String.valueOf(random.nextInt(10));
sRand+=rand;
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
g.drawString(rand,13*i+6,16);
}
str = sRand;
g.dispose();
ByteArrayInputStream input=null;
ByteArrayOutputStream output = new ByteArrayOutputStream();
try{
ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
ImageIO.write(image, "JPEG", imageOut);
imageOut.close();
input = new ByteArrayInputStream(output.toByteArray());
}catch(Exception e){
System.out.println("验证码图片产生出现错误："+e.toString());
}
image=input;
}
private Color getRandColor(int fc, int bc) {
Random random = new Random();
if(fc>255) fc=255;
if(bc>255) bc=255;
int r=fc+random.nextInt(bc-fc);
int g=fc+random.nextInt(bc-fc);
int b=fc+random.nextInt(bc-fc);
return new Color(r,g,b);
}
}
