java+Struts2生成验证码
public class VerifyCode {
private int w = 70;
private int h = 35;
private Random r = new Random();
// {"宋体", "华文楷体", "黑体", "华文新魏", "华文隶书", "微软雅黑", "楷体_GB2312"}
private String[] fontNames = {"宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312"};
private String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";
private Color bgColor = new Color(255, 255, 255);
private String text ;
private Color randomColor () {
int red = r.nextInt(150);
int green = r.nextInt(150);
int blue = r.nextInt(150);
return new Color(red, green, blue);
}
private Font randomFont () {
int index = r.nextInt(fontNames.length);
String fontName = fontNames[index];
int style = r.nextInt(4);
int size = r.nextInt(5) + 24;
return new Font(fontName, style, size);
}
private void drawLine (BufferedImage image) {
int num = 3;
Graphics2D g2 = (Graphics2D)image.getGraphics();
for(int i = 0; i < num; i++) {
int x1 = r.nextInt(w);
int y1 = r.nextInt(h);
int x2 = r.nextInt(w);
int y2 = r.nextInt(h);
g2.setStroke(new BasicStroke(1.5F));
g2.setColor(Color.BLUE);
g2.drawLine(x1, y1, x2, y2);
}
}
private char randomChar () {
int index = r.nextInt(codes.length());
return codes.charAt(index);
}
private BufferedImage createImage () {
BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D)image.getGraphics();
g2.setColor(this.bgColor);
g2.fillRect(0, 0, w, h);
return image;
}
public BufferedImage getImage () {
BufferedImage image = createImage();
Graphics2D g2 = (Graphics2D)image.getGraphics();
StringBuilder sb = new StringBuilder();
// 向图片中画4个字符
for(int i = 0; i < 4; i++) {
String s = randomChar() + "";
sb.append(s);
float x = i * 1.0F * w / 4;
g2.setFont(randomFont());
g2.setColor(randomColor());
g2.drawString(s, x, h-5);
}
this.text = sb.toString();
drawLine(image);
return image;
}
public String getText () {
return text;
}
public static void output (BufferedImage image, OutputStream out)
throws IOException {
ImageIO.write(image, "JPEG", out);
}
}
在struts上使用添加方法
public ByteArrayInputStream getout()
throws IOException {
ByteArrayInputStream input=null;
ByteArrayOutputStream output = new ByteArrayOutputStream();
ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
ImageIO.write(getImage(), "JPEG", imageOut);
imageOut.close();
return input = new ByteArrayInputStream(output.toByteArray());
}
action
public class VcodeAction extends ActionSupport{
private VerifyCode v= new VerifyCode();
private ByteArrayInputStream inputStream;
//生成验证码
public String vcode() throws IOException{
setInputStream(v.getout());
VCode=v.getText();
return SUCCESS;
}
}
//流
private void setInputStream(ByteArrayInputStream inputStream) {
this.inputStream=inputStream;
}
public ByteArrayInputStream getInputStream() {
return inputStream;
}
}
Struts2 XML配置
<action name="code_*" class="action.VcodeAction" method="{1}" >
<result type="stream">
<param name="contentType">image/jpeg</param>
<param name="inputName">inputStream</param>
</result>
jsp页面使用
<script type="text/javascript" src="js/jquery-1.5.1.js">
function changeImg(){
$("#authCode").attr("src","code_vcode.action?d="+new Date().getTime());
}
</script>
</head>
<body>
<center>
<br>
<form action="code_YanzhengVcode.action" method="post">
<input type="text" />
<img src="code_vcode.action" alt="验证码" id="authCode" onclick="changeImg()">
<a href="javascript:changeImg()">看不清，换一张！</a><br>
<input type="text" name="vcode"/>
<input type="submit" value="提交"/> ${vcode}
</form>
public class VerifyCode {
private int w = 70;
private int h = 35;
private Random r = new Random();
// {"宋体", "华文楷体", "黑体", "华文新魏", "华文隶书", "微软雅黑", "楷体_GB2312"}
private String[] fontNames = {"宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312"};
private String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";
private Color bgColor = new Color(255, 255, 255);
private String text ;
private Color randomColor () {
int red = r.nextInt(150);
int green = r.nextInt(150);
int blue = r.nextInt(150);
return new Color(red, green, blue);
}
private Font randomFont () {
int index = r.nextInt(fontNames.length);
String fontName = fontNames[index];
int style = r.nextInt(4);
int size = r.nextInt(5) + 24;
return new Font(fontName, style, size);
}
private void drawLine (BufferedImage image) {
int num = 3;
Graphics2D g2 = (Graphics2D)image.getGraphics();
for(int i = 0; i < num; i++) {
int x1 = r.nextInt(w);
int y1 = r.nextInt(h);
int x2 = r.nextInt(w);
int y2 = r.nextInt(h);
g2.setStroke(new BasicStroke(1.5F));
g2.setColor(Color.BLUE);
g2.drawLine(x1, y1, x2, y2);
}
}
private char randomChar () {
int index = r.nextInt(codes.length());
return codes.charAt(index);
}
private BufferedImage createImage () {
BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D)image.getGraphics();
g2.setColor(this.bgColor);
g2.fillRect(0, 0, w, h);
return image;
}
public BufferedImage getImage () {
BufferedImage image = createImage();
Graphics2D g2 = (Graphics2D)image.getGraphics();
StringBuilder sb = new StringBuilder();
// 向图片中画4个字符
for(int i = 0; i < 4; i++) {
String s = randomChar() + "";
sb.append(s);
float x = i * 1.0F * w / 4;
g2.setFont(randomFont());
g2.setColor(randomColor());
g2.drawString(s, x, h-5);
}
this.text = sb.toString();
drawLine(image);
return image;
}
public String getText () {
return text;
}
public static void output (BufferedImage image, OutputStream out)
throws IOException {
ImageIO.write(image, "JPEG", out);
}
}
在struts上使用添加方法
public ByteArrayInputStream getout()
throws IOException {
ByteArrayInputStream input=null;
ByteArrayOutputStream output = new ByteArrayOutputStream();
ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
ImageIO.write(getImage(), "JPEG", imageOut);
imageOut.close();
return input = new ByteArrayInputStream(output.toByteArray());
}
action
public class VcodeAction extends ActionSupport{
private VerifyCode v= new VerifyCode();
private ByteArrayInputStream inputStream;
//生成验证码
public String vcode() throws IOException{
setInputStream(v.getout());
VCode=v.getText();
return SUCCESS;
}
}
//流
private void setInputStream(ByteArrayInputStream inputStream) {
this.inputStream=inputStream;
}
public ByteArrayInputStream getInputStream() {
return inputStream;
}
}
Struts2 XML配置
<action name="code_*" class="action.VcodeAction" method="{1}" >
<result type="stream">
<param name="contentType">image/jpeg</param>
<param name="inputName">inputStream</param>
</result>
jsp页面使用
<script type="text/javascript" src="js/jquery-1.5.1.js">
function changeImg(){
$("#authCode").attr("src","code_vcode.action?d="+new Date().getTime());
}
</script>
</head>
<body>
<center>
<br>
<form action="code_YanzhengVcode.action" method="post">
<input type="text" />
<img src="code_vcode.action" alt="验证码" id="authCode" onclick="changeImg()">
<a href="javascript:changeImg()">看不清，换一张！</a><br>
<input type="text" name="vcode"/>
<input type="submit" value="提交"/> ${vcode}
</form>