如何向Graphics2D的jpeg图片中drawString一串汉字？？？-CSDN社区

package cn.com.xause.servlet;

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class CreatePic
{
public static void gg()
{
try {
BufferedImage bufImg = new BufferedImage(100,100,BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = (Graphics2D) bufImg.getGraphics();
g2d.drawString("Test123",10,10);
g2d.drawString("aaaaaaaaa",10,20);
g2d.drawString("bbbbbbbbb",10,30);

ByteArrayOutputStream boutstream = new ByteArrayOutputStream();
JPEGImageEncoder enc = JPEGCodec.createJPEGEncoder(boutstream);
JPEGEncodeParam params = JPEGCodec.getDefaultJPEGEncodeParam(bufImg);
params.setQuality(100, true);
enc.encode(bufImg, params);

File f = new File("test.jpg");
FileOutputStream fimage = new FileOutputStream(new File("test.jpg"));
boutstream.writeTo(fimage);
fimage.close();
} catch (Exception e) {
System.out.println(e);
}
}

public static void main(String args[])
{
System.out.println("*******");
gg();
}
}

using System; using System.Collections.Generic; using System.Text; using System.IO; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; namespace rkk0108.Controllers { ///

/// 图片处理 /// http://www.cnblogs.com/wu-jian/ /// /// 吴剑 2011-02-20 创建 /// 吴剑 2012-08-08 修改 ///

public class MyImageHelper { #region 正方型裁剪并缩放 ///

/// 正方型裁剪 /// 以图片中心为轴心，截取正方型，然后等比缩放 /// 用于头像处理 ///

/// 指定长宽裁剪 /// 按模版比例最大范围的裁剪图片并缩放至模版尺寸 ///

/// 图片等比缩放 ///

/// 吴剑 2012-08-08 /// 原图Stream对象 /// 缩略图存放地址 /// 指定的最大宽度 /// 指定的最大高度 /// 水印文字(为""表示不使用水印) /// 水印图片路径(为""表示不使用水印) public static void ZoomAuto(System.IO.Stream fromFile, string savePath, System.Double targetWidth, System.Double targetHeight, string watermarkText, string watermarkImage) { //创建目录 string dir = Path.GetDirectoryName(savePath); if (!Directory.Exists(dir)) Directory.CreateDirectory(dir); //原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息） System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true); //原图宽高均小于模版，不作处理，直接保存 if (initImage.Width <= targetWidth && initImage.Height <= targetHeight) { //文字水印 if (watermarkText != "") { using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(initImage)) { System.Drawing.Font fontWater = new Font("黑体", 10); System.Drawing.Brush brushWater = new SolidBrush(Color.White); gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10); gWater.Dispose(); } } //透明图片水印 if (watermarkImage != "") { if (File.Exists(watermarkImage)) { //获取水印图片 using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage)) { //水印绘制条件：原始图片宽高均大于或等于水印图片 if (initImage.Width >= wrImage.Width && initImage.Height >= wrImage.Height) { Graphics gWater = Graphics.FromImage(initImage); //透明属性 ImageAttributes imgAttributes = new ImageAttributes(); ColorMap colorMap = new ColorMap(); colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); ColorMap[] remapTable = { colorMap }; imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap); float[][] colorMatrixElements = { new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.5f, 0.0f},//透明度:0.5 new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements); imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); gWater.DrawImage(wrImage, new Rectangle(initImage.Width - wrImage.Width, initImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes); gWater.Dispose(); } wrImage.Dispose(); } } } //保存 initImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg); } else { //缩略图宽、高计算 double newWidth = initImage.Width; double newHeight = initImage.Height; //宽大于高或宽等于高（横图或正方） if (initImage.Width > initImage.Height || initImage.Width == initImage.Height) { //如果宽大于模版 if (initImage.Width > targetWidth) { //宽按模版，高按比例缩放 newWidth = targetWidth; newHeight = initImage.Height * (targetWidth / initImage.Width); } } //高大于宽（竖图） else { //如果高大于模版 if (initImage.Height > targetHeight) { //高按模版，宽按比例缩放 newHeight = targetHeight; newWidth = initImage.Width * (targetHeight / initImage.Height); } } //生成新图 //新建一个bmp图片 System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWidth, (int)newHeight); //新建一个画板 System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage); //设置质量 newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //置背景色 newG.Clear(Color.White); //画图 newG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel); //文字水印 if (watermarkText != "") { using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(newImage)) { System.Drawing.Font fontWater = new Font("宋体", 10); System.Drawing.Brush brushWater = new SolidBrush(Color.White); gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10); gWater.Dispose(); } } //透明图片水印 if (watermarkImage != "") { if (File.Exists(watermarkImage)) { //获取水印图片 using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage)) { //水印绘制条件：原始图片宽高均大于或等于水印图片 if (newImage.Width >= wrImage.Width && newImage.Height >= wrImage.Height) { Graphics gWater = Graphics.FromImage(newImage); //透明属性 ImageAttributes imgAttributes = new ImageAttributes(); ColorMap colorMap = new ColorMap(); colorMap.OldColor = Color.FromArgb(255, 0, 255, 0); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); ColorMap[] remapTable = { colorMap }; imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap); float[][] colorMatrixElements = { new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.5f, 0.0f},//透明度:0.5 new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements); imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); gWater.DrawImage(wrImage, new Rectangle(newImage.Width - wrImage.Width, newImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes); gWater.Dispose(); } wrImage.Dispose(); } } } //保存缩略图 newImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg); //释放资源 newG.Dispose(); newImage.Dispose(); initImage.Dispose(); } } #endregion #region 其它 ///

/// 判断文件类型是否为WEB格式图片 /// (注：JPG,GIF,BMP,PNG) ///

/// HttpPostedFile.ContentType /// public static bool IsWebImage(string contentType) { if (contentType == "image/pjpeg" || contentType == "image/jpeg" || contentType == "image/gif" || contentType == "image/bmp" || contentType == "image/png") { return true; } else { return false; } } #endregion }//end class }

基于SpringMVC annotation 的图形验证码主要是controller的写法实现前台验证码的显示和刷新验证功能相信大家都能写出来访问 http://localhost:8080/SpringMVC_annotation_volidate/login jsp页面关键代码 function changeValidateCode(obj){ var timeNow = new Date().getTime(); obj.src="checkCode/service.do?time="+timeNow; } .. .. .. .. Controller package qianyan.mofi.controller; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller @RequestMapping("/checkCode") public class CheckCodeController extends HttpServlet { public CheckCodeController() { super(); } public void destroy() { super.destroy(); } public void init() throws ServletException { super.init(); } public Color getRandColor(int s, int e) { Random random = new Random(); if (s > 255) s = 255; if (e > 255) e = 255; int r = s + random.nextInt(e - s); int g = s + random.nextInt(e - s); int b = s + random.nextInt(e - s); return new Color(r, g, b); } @RequestMapping("service.do") public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 禁止缓存 response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "No-cache"); response.setDateHeader("Expires", 0); // 指定生成的响应是图片 response.setContentType("image/jpeg"); int width = 200; int height = 60; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 创建BufferedImage类的对象 Graphics g = image.getGraphics(); // 创建Graphics类的对象 Graphics2D g2d = (Graphics2D) g; // 通过Graphics类的对象创建一个Graphics2D类的对象 Random random = new Random(); // 实例化一个Random对象 Font mFont = new Font("华文宋体", Font.BOLD, 30); // 通过Font构造字体 g.setColor(getRandColor(200, 250)); // 改变图形的当前颜色为随机生成的颜色 g.fillRect(0, 0, width, height); // 绘制一个填色矩形 // 画一条折线 BasicStroke bs = new BasicStroke(2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL); // 创建一个供画笔选择线条粗细的对象 g2d.setStroke(bs); // 改变线条的粗细 g.setColor(Color.DARK_GRAY); // 设置当前颜色为预定义颜色中的深灰色 int[] xPoints = new int[3]; int[] yPoints = new int[3]; for (int j = 0; j < 3; j++) { xPoints[j] = random.nextInt(width - 1); yPoints[j] = random.nextInt(height - 1); } g.drawPolyline(xPoints, yPoints, 3); // 生成并输出随机的验证文字 g.setFont(mFont); String sRand = ""; int itmp = 0; for (int i = 0; i 1.1f) scaleSize = 1f; trans.scale(scaleSize, scaleSize); g2d_word.setTransform(trans); /************************/ g.drawString(String.valueOf(ctmp), 30 * i + 40, 16); } // 将生成的验证码保存到Session中 HttpSession session = request.getSession(true); session.setAttribute("randCheckCode", sRand); g.dispose(); ImageIO.write(image, "JPEG", response.getOutputStream()); } }

可以轻松给图片加文字水印 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.IO; namespace WindowsApplication7 { public partial class FrmAddWave : Form { public FrmAddWave() { InitializeComponent(); } private void MakeWaterMark(string IconImg) { //定义输出位图 Bitmap bmp = new Bitmap(1000, 700); //定义绘图对象 Graphics g = Graphics.FromImage(bmp); //描述绘图矩形区域 Rectangle newRect = new Rectangle(0, 0, 1000, 700); //设置背景色 g.FillRectangle(new SolidBrush(Color.White), newRect); //获取要生成水印的图片 Bitmap newBitmap = new Bitmap(IconImg); g.DrawImage(newBitmap, 16, 16); //定义水印字的字体 Font font = new Font( "Arial", 12, FontStyle.Bold ); //定义水印字的格式刷 LinearGradientBrush brush = new LinearGradientBrush( new Rectangle(600, 600, 71, 23), Color.Red, Color.Blue, 30f, true ); //给照片打上水印 g.DrawString("copyright by test. " + System.DateTime.Now.ToShortDateString(), font, brush, 0, 0); //保存为新的输出图片 System.IO.MemoryStream ms = new System.IO.MemoryStream(); bmp.Save(@"c:\a1.jpg", ImageFormat.Jpeg); ////输出图片 //Response.ClearContent(); //Response.ContentType = "image/jpeg"; //Response.BinaryWrite(ms.ToArray()); } private void button1_Click(object sender, EventArgs e) { string strsavepath = txtsavepath.Text.ToString(); string strfilepath =textBox1.Text; if (textBox2.Text.Trim() == "") { MessageBox.Show("请输入要显示的文字"); textBox2.Focus(); return; } if (textBox1.Text.Trim() == "") { MessageBox.Show("请选择要处理的图片路径,图片必须是JPG格式"); return; } if (txtsavepath.Text.Trim() == "") { MessageBox.Show("请选择处理后的图片保存路径"); return; } if (textBox1.Text == strsavepath) { MessageBox.Show("处理后的图片保存目录不能和原目录相同"); txtsavepath.Text = ""; return ; } try { string[] font1 = txtfont.Text.Split(','); DirectoryInfo TheFolder = new DirectoryInfo(textBox1.Text); //遍历文件夹 int count = TheFolder.GetFiles().Length; int scount = 1; if (count > 0) { pb1.Maximum = count; pb1.Minimum = 1; pb1.Visible = true; } //遍历文件 foreach (FileInfo NextFile in TheFolder.GetFiles()) { pb1.Value = scount; string[] p1 = NextFile.Name.ToString().Split('.'); if (p1[1].ToString().ToLower() == "jpg" || p1[1] == "jpeg") { Makewatermark(NextFile.FullName, strsavepath + "\\" + NextFile.Name.ToString(), textBox2.Text, font1[0].ToString(), float.Parse(font1[1])); } scount++; } MessageBox.Show("处理完成！"); pb1.Visible = false; } catch (Exception ex) { MessageBox.Show(ex.Message); } } public void Makewatermark(string FilePath, string SavePath, string watermarkText,string fontname,float fontsize) { try { System.Drawing.Image image = System.Drawing.Image.FromFile(FilePath); int x = image.Width; int y = image.Height; Graphics g = Graphics.FromImage(image); g.DrawImage(image, 0, 0, image.Width, image.Height); Font f = new Font(fontname, fontsize ); Brush b = new SolidBrush(Color.Red ); string addText = watermarkText.Trim(); //g.DrawString(addText, f, b, x - 500, y - 50); g.DrawString(addText, f, b, x /4, y /2); g.Dispose(); image.Save(SavePath); image.Dispose(); //if (File.Exists(SavePath)) //{ // File.Delete(SavePath); //} } catch (Exception ex) { throw ex; } } private void butpath_Click(object sender, EventArgs e) { if (folderBrowserDialog1.ShowDialog() == DialogResult.OK ) { textBox1.Text = folderBrowserDialog1.SelectedPath; } } private void butsave_Click(object sender, EventArgs e) { if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) { txtsavepath.Text = folderBrowserDialog1.SelectedPath; } } private void button2_Click(object sender, EventArgs e) { if (fontDialog1.ShowDialog() == DialogResult.OK) { txtfont.Text = fontDialog1.Font.Name.ToString()+","+ fontDialog1.Font.Size.ToString(); } } private void button3_Click(object sender, EventArgs e) { this.Close(); } } }

package Cls; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class MyVerifyCode extends HttpServlet { private static MyVerifyCode instance; private final String ATTRIBUTE_NAME = "verifycode"; // ��֤��ַ�� private final int CODE_LENGTH =4; // ��֤��߶�� private static final int Height =30; // ��֤��Ƿ��Ҫ��תЧ�� private boolean ROTATE_FLAG = true; //��Ƿ��Ҫ�� private boolean FONT_FLAG=false; //��Ĭ�� private String font=""; //��Ĵ�С,Ĭ��Ϊ15 private int fontsize=15; private final String RAND_RANGE = "abcdefhgkmnpqrstuvwxyz" + "ABCDEFGHGKLMNPQRSTUVWXYZ" + "2345678"; // private Random rand=new Random(); public static Random rand = new Random(); private final char[] CHARS = RAND_RANGE.toCharArray(); // ��캯�� public MyVerifyCode() { } public static MyVerifyCode getInstance() { if (instance == null) instance = new MyVerifyCode(); return instance; } // ��ַ� private String getRandString() { StringBuffer vcode = new StringBuffer(); for (int i = 0; i < CODE_LENGTH; i++) vcode.append(CHARS[rand.nextInt(CHARS.length)]); return vcode.toString(); } // �� public static float getRandomJiao() { float jiao = 0.0f; if (rand.nextFloat()<=0.5) { jiao = rand.nextFloat()-0.3f; } else { jiao = -rand.nextFloat()+0.3f; } return jiao; } // ��ɫ private Color getRandColor(int ll, int ul) { if (ll > 255) ll = 255; if (ll < 1) ll = 1; if (ul > 255) ul = 255; if (ul < 1) ul = 1; if (ul == ll) ul = ll + 1; int r = rand.nextInt(ul - ll) + ll; int g = rand.nextInt(ul - ll) + ll; int b = rand.nextInt(ul - ll) + ll; Color color = new Color(r, g, b); return color; } private BufferedImage getImage(HttpServletRequest request) { //根据设置的高度计算事宜的fontsize int FontSize=Height*75/96; //根据设置的字体及字的个数计算出适宜的宽度 int width = CODE_LENGTH * FontSize*4/5 + 10; //根据字体大小设置X轴的位移量 int X_=FontSize/2; BufferedImage image = new BufferedImage(width,Height, BufferedImage.TYPE_INT_RGB); // ��ȡͼ�� Graphics graphics = image.getGraphics(); Graphics2D g2 = (Graphics2D) graphics; g2.setColor(getRandColor(100, 255)); g2.setColor(Color.WHITE); g2.fillRect(0, 0, width, Height); g2.translate(0, Height*2/3); double oldrot = 0; String vcode=this.getRandString(); // 把验证码存入session request.getSession(true).setAttribute("codes", vcode); for (int i = 0; i < CODE_LENGTH; i++) { g2.setFont(new Font("Times New Roman", Font.HANGING_BASELINE, FontSize)); double rot = getRandomJiao(); // 旋转画笔 if (ROTATE_FLAG) { g2.rotate(-oldrot); g2.translate(X_+rand.nextInt(8), 0); oldrot = rot; g2.rotate(rot); } String temp = vcode.substring(i, i + 1); g2.setColor(getRandColor(1, 100)); g2.drawString(temp, 0, 0); } // ͼ��Ч g2.dispose(); return image; } public void printImage(HttpServletRequest request, HttpServletResponse response) { // ��ContentType��Ϊ"image/jpeg"��ʶ��ͼ��ʽ�� response.setContentType("image/jpeg"); // ��ҳ�治�� response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 2000); // ��֤�� String verifyCode = this.getRandString(); // ��֤��ͼ�� BufferedImage bi = this.getImage(request); try { // ��Servlet�� ServletOutputStream outStream = response.getOutputStream(); // ��ͼ��ݱ��ΪJPEG��ı�� JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outStream); // ��ͼ��ݽ��б�� encoder.encode(bi); // ǿ�н��뵽ҳ�� outStream.flush(); // �ر�� outStream.close(); } catch (IOException ex) { ex.printStackTrace(); } } public void doGet(HttpServletRequest request, HttpServletResponse response) { printImage(request, response); } }