java+Struts2生成验证码

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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

<param name="contentType">image/jpeg</param>

<param name="inputName">inputStream</param>

</result>

jsp页面使用

function changeImg(){

$("#authCode").attr("src","code_vcode.action?d="+new Date().getTime());

}

</script>

</head>

<body>

<br>

<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

<param name="contentType">image/jpeg</param>

<param name="inputName">inputStream</param>

</result>

jsp页面使用

function changeImg(){

$("#authCode").attr("src","code_vcode.action?d="+new Date().getTime());

}

</script>

</head>

<body>

<br>

<input type="submit" value="提交"/> ${vcode}

</form>

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