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如何向Graphics2D的jpeg图片中drawString一串汉字???
fengyuxi
2003-10-16 11:05:52
g.drawString("正常状态的用户", 37,155);
我的java环境可以正确输出这些汉字,
但是以写到jpg图片里,就出方块!
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如何向Graphics2D的jpeg图片中drawString一串汉字???
g.drawString("正常状态的用户", 37,155); 我的java环境可以正确输出这些汉字, 但是以写到jpg图片里,就出方块!
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希偌
2003-10-16
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g.drawImage();
之後
g.drawString
希偌
2003-10-16
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看看偶的文档,可以输出中文:
http://www.csdn.net/develop/read_article.asp?id=16488
fengyuxi
2003-10-16
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g.drawImage(getImage(intLX_YH), null, 50,100);
g.drawString("正常状态的用户", 37,155);
在hp11的weblogic平台下!
文件生成
图片
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
.
JPEG
Codec;
import com.sun.image.codec.
jpeg
.
JPEG
EncodeParam;
import com.sun.image.codec.
jpeg
.
JPEG
ImageEncoder;
public class CreatePic
{
public static void gg()
{
try {
BufferedImage bufImg = new BufferedImage(100,100,BufferedImage.TYPE_INT_RGB);
Graphics2D
g2d = (
Graphics2D
) bufImg.getGraphics();
g2d.
draw
String
("Test123",10,10);
g2d.
draw
String
("aaaaaaaaa",10,20);
g2d.
draw
String
("bbbbbbbbb",10,30);
ByteArrayOutputStream boutstream = new ByteArrayOutputStream();
JPEG
ImageEncoder enc =
JPEG
Codec.create
JPEG
Encoder(boutstream);
JPEG
EncodeParam params =
JPEG
Codec.getDefault
JPEG
EncodeParam(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();
}
}
图片
水印 缩略图+裁剪(MyImageHelper)
using System; using System.Collections.Generic; using System.Text; using System.IO; using System.
Draw
ing; using System.
Draw
ing.
Draw
ing2D; using System.
Draw
ing.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 ///
///
吴剑 2012-08-08
///
图片
绝对地址 ///
缩略图存放地址 ///
指定的边长(正方型) ///
质量(范围0-100) public static void CutForSquare(
string
filePath,
string
fileSaveUrl, int side, int quality) { FileStream fileStream = new FileStream(filePath, FileMode.Open); Stream fromFile = fileStream as Stream; //创建目录
string
dir = Path.GetDirectoryName(fileSaveUrl); 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.
Draw
ing.Image initImage = System.
Draw
ing.Image.FromStream(fromFile, true); //原图宽高均小于模版,不作处理,直接保存 if (initImage.Width <= side && initImage.Height <= side) { initImage.Save(fileSaveUrl, System.
Draw
ing.Imaging.ImageFormat.
Jpeg
); } else { //原始
图片
的宽、高 int initWidth = initImage.Width; int initHeight = initImage.Height; //非正方型先裁剪为正方型 if (initWidth != initHeight) { //截图对象 System.
Draw
ing.Image pickedImage = null; System.
Draw
ing.Graphics pickedG = null; //宽大于高的横图 if (initWidth > initHeight) { //对象实例化 pickedImage = new System.
Draw
ing.Bitmap(initHeight, initHeight); pickedG = System.
Draw
ing.Graphics.FromImage(pickedImage); //设置质量 pickedG.InterpolationMode = System.
Draw
ing.
Draw
ing2D.InterpolationMode.HighQualityBicubic; pickedG.SmoothingMode = System.
Draw
ing.
Draw
ing2D.SmoothingMode.HighQuality; //定位 Rectangle fromR = new Rectangle((initWidth - initHeight) / 2, 0, initHeight, initHeight); Rectangle toR = new Rectangle(0, 0, initHeight, initHeight); //画图 pickedG.
Draw
Image(initImage, toR, fromR, System.
Draw
ing.GraphicsUnit.Pixel); //重置宽 initWidth = initHeight; } //高大于宽的竖图 else { //对象实例化 pickedImage = new System.
Draw
ing.Bitmap(initWidth, initWidth); pickedG = System.
Draw
ing.Graphics.FromImage(pickedImage); //设置质量 pickedG.InterpolationMode = System.
Draw
ing.
Draw
ing2D.InterpolationMode.HighQualityBicubic; pickedG.SmoothingMode = System.
Draw
ing.
Draw
ing2D.SmoothingMode.HighQuality; //定位 Rectangle fromR = new Rectangle(0, (initHeight - initWidth) / 2, initWidth, initWidth); Rectangle toR = new Rectangle(0, 0, initWidth, initWidth); //画图 pickedG.
Draw
Image(initImage, toR, fromR, System.
Draw
ing.GraphicsUnit.Pixel); //重置高 initHeight = initWidth; } //将截图对象赋给原图 initImage = (System.
Draw
ing.Image)pickedImage.Clone(); //释放截图资源 pickedG.Dispose(); pickedImage.Dispose(); } //缩略图对象 System.
Draw
ing.Image resultImage = new System.
Draw
ing.Bitmap(side, side); System.
Draw
ing.Graphics resultG = System.
Draw
ing.Graphics.FromImage(resultImage); //设置质量 resultG.InterpolationMode = System.
Draw
ing.
Draw
ing2D.InterpolationMode.HighQualityBicubic; resultG.SmoothingMode = System.
Draw
ing.
Draw
ing2D.SmoothingMode.HighQuality; //用指定背景色清空画布 resultG.Clear(Color.White); //绘制缩略图 resultG.
Draw
Image(initImage, new System.
Draw
ing.Rectangle(0, 0, side, side), new System.
Draw
ing.Rectangle(0, 0, initWidth, initHeight), System.
Draw
ing.GraphicsUnit.Pixel); //关键质量控制 //获取系统编码类型数组,包含了
jpeg
,bmp,png,gif,tiff ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders(); ImageCodecInfo ici = null; foreach (ImageCodecInfo i in icis) { if (i.MimeType == "image/
jpeg
" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif") { ici = i; } } EncoderParameters ep = new EncoderParameters(1); ep.Param[0] = new EncoderParameter(System.
Draw
ing.Imaging.Encoder.Quality, (long)quality); //保存缩略图 resultImage.Save(fileSaveUrl, ici, ep); //释放关键质量控制所用资源 ep.Dispose(); //释放缩略图资源 resultG.Dispose(); resultImage.Dispose(); //释放原始
图片
资源 initImage.Dispose(); } } #endregion #region 自定义裁剪并缩放 ///
/// 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 ///
///
吴剑 2012-08-08
///
原图Stream对象 ///
保存路径 ///
最大宽(单位:px) ///
最大高(单位:px) ///
质量(范围0-100) public static void CutForCustom(System.IO.Stream fromFile,
string
fileSaveUrl, int maxWidth, int maxHeight, int quality) { //从文件获取原始
图片
,并使用流
中
嵌入的颜色管理信息 System.
Draw
ing.Image initImage = System.
Draw
ing.Image.FromStream(fromFile, true); //原图宽高均小于模版,不作处理,直接保存 if (initImage.Width <= maxWidth && initImage.Height <= maxHeight) { initImage.Save(fileSaveUrl, System.
Draw
ing.Imaging.ImageFormat.
Jpeg
); } else { //模版的宽高比例 double templateRate = (double)maxWidth / maxHeight; //原
图片
的宽高比例 double initRate = (double)initImage.Width / initImage.Height; //原图与模版比例相等,直接缩放 if (templateRate == initRate) { //按模版大小生成最终
图片
System.
Draw
ing.Image templateImage = new System.
Draw
ing.Bitmap(maxWidth, maxHeight); System.
Draw
ing.Graphics templateG = System.
Draw
ing.Graphics.FromImage(templateImage); templateG.InterpolationMode = System.
Draw
ing.
Draw
ing2D.InterpolationMode.High; templateG.SmoothingMode = System.
Draw
ing.
Draw
ing2D.SmoothingMode.HighQuality; templateG.Clear(Color.White); templateG.
Draw
Image(initImage, new System.
Draw
ing.Rectangle(0, 0, maxWidth, maxHeight), new System.
Draw
ing.Rectangle(0, 0, initImage.Width, initImage.Height), System.
Draw
ing.GraphicsUnit.Pixel); templateImage.Save(fileSaveUrl, System.
Draw
ing.Imaging.ImageFormat.
Jpeg
); } //原图与模版比例不等,裁剪后缩放 else { //裁剪对象 System.
Draw
ing.Image pickedImage = null; System.
Draw
ing.Graphics pickedG = null; //定位 Rectangle fromR = new Rectangle(0, 0, 0, 0);//原图裁剪定位 Rectangle toR = new Rectangle(0, 0, 0, 0);//目标定位 //宽为标准进行裁剪 if (templateRate > initRate) { //裁剪对象实例化 pickedImage = new System.
Draw
ing.Bitmap(initImage.Width, (int)System.Math.Floor(initImage.Width / templateRate)); pickedG = System.
Draw
ing.Graphics.FromImage(pickedImage); //裁剪源定位 fromR.X = 0; fromR.Y = (int)System.Math.Floor((initImage.Height - initImage.Width / templateRate) / 2); fromR.Width = initImage.Width; fromR.Height = (int)System.Math.Floor(initImage.Width / templateRate); //裁剪目标定位 toR.X = 0; toR.Y = 0; toR.Width = initImage.Width; toR.Height = (int)System.Math.Floor(initImage.Width / templateRate); } //高为标准进行裁剪 else { pickedImage = new System.
Draw
ing.Bitmap((int)System.Math.Floor(initImage.Height * templateRate), initImage.Height); pickedG = System.
Draw
ing.Graphics.FromImage(pickedImage); fromR.X = (int)System.Math.Floor((initImage.Width - initImage.Height * templateRate) / 2); fromR.Y = 0; fromR.Width = (int)System.Math.Floor(initImage.Height * templateRate); fromR.Height = initImage.Height; toR.X = 0; toR.Y = 0; toR.Width = (int)System.Math.Floor(initImage.Height * templateRate); toR.Height = initImage.Height; } //设置质量 pickedG.InterpolationMode = System.
Draw
ing.
Draw
ing2D.InterpolationMode.HighQualityBicubic; pickedG.SmoothingMode = System.
Draw
ing.
Draw
ing2D.SmoothingMode.HighQuality; //裁剪 pickedG.
Draw
Image(initImage, toR, fromR, System.
Draw
ing.GraphicsUnit.Pixel); //按模版大小生成最终
图片
System.
Draw
ing.Image templateImage = new System.
Draw
ing.Bitmap(maxWidth, maxHeight); System.
Draw
ing.Graphics templateG = System.
Draw
ing.Graphics.FromImage(templateImage); templateG.InterpolationMode = System.
Draw
ing.
Draw
ing2D.InterpolationMode.High; templateG.SmoothingMode = System.
Draw
ing.
Draw
ing2D.SmoothingMode.HighQuality; templateG.Clear(Color.White); templateG.
Draw
Image(pickedImage, new System.
Draw
ing.Rectangle(0, 0, maxWidth, maxHeight), new System.
Draw
ing.Rectangle(0, 0, pickedImage.Width, pickedImage.Height), System.
Draw
ing.GraphicsUnit.Pixel); //关键质量控制 //获取系统编码类型数组,包含了
jpeg
,bmp,png,gif,tiff ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders(); ImageCodecInfo ici = null; foreach (ImageCodecInfo i in icis) { if (i.MimeType == "image/
jpeg
" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif") { ici = i; } } EncoderParameters ep = new EncoderParameters(1); ep.Param[0] = new EncoderParameter(System.
Draw
ing.Imaging.Encoder.Quality, (long)quality); //保存缩略图 templateImage.Save(fileSaveUrl, ici, ep); //templateImage.Save(fileSaveUrl, System.
Draw
ing.Imaging.ImageFormat.
Jpeg
); //释放资源 templateG.Dispose(); templateImage.Dispose(); pickedG.Dispose(); pickedImage.Dispose(); } } //释放资源 initImage.Dispose(); } #endregion #region 等比缩放 ///
///
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.
Draw
ing.Image initImage = System.
Draw
ing.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.
Draw
ing.Graphics gWater = System.
Draw
ing.Graphics.FromImage(initImage)) { System.
Draw
ing.Font fontWater = new Font("黑体", 10); System.
Draw
ing.Brush brushWater = new SolidBrush(Color.White); gWater.
Draw
String
(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.
Draw
ing.Image wrImage = System.
Draw
ing.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.
Draw
Image(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.
Draw
ing.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.
Draw
ing.Image newImage = new System.
Draw
ing.Bitmap((int)newWidth, (int)newHeight); //新建一个画板 System.
Draw
ing.Graphics newG = System.
Draw
ing.Graphics.FromImage(newImage); //设置质量 newG.InterpolationMode = System.
Draw
ing.
Draw
ing2D.InterpolationMode.HighQualityBicubic; newG.SmoothingMode = System.
Draw
ing.
Draw
ing2D.SmoothingMode.HighQuality; //置背景色 newG.Clear(Color.White); //画图 newG.
Draw
Image(initImage, new System.
Draw
ing.Rectangle(0, 0, newImage.Width, newImage.Height), new System.
Draw
ing.Rectangle(0, 0, initImage.Width, initImage.Height), System.
Draw
ing.GraphicsUnit.Pixel); //文字水印 if (watermarkText != "") { using (System.
Draw
ing.Graphics gWater = System.
Draw
ing.Graphics.FromImage(newImage)) { System.
Draw
ing.Font fontWater = new Font("宋体", 10); System.
Draw
ing.Brush brushWater = new SolidBrush(Color.White); gWater.
Draw
String
(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.
Draw
ing.Image wrImage = System.
Draw
ing.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.
Draw
Image(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.
Draw
ing.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/p
jpeg
" || 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
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.
draw
Polyline(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.
draw
String
(
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()); } }
给
图片
加水印
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.
Draw
ing; using System.Text; using System.Windows.Forms; using System.
Draw
ing.
Draw
ing2D; using System.
Draw
ing.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.
Draw
Image(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.
Draw
String
("copyright by test. " + System.DateTime.Now.ToShortDate
String
(), 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.To
String
();
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.To
String
().Split('.'); if (p1[1].To
String
().ToLower() == "jpg" || p1[1] == "
jpeg
") { Makewatermark(NextFile.FullName, strsavepath + "\\" + NextFile.Name.To
String
(), textBox2.Text, font1[0].To
String
(), 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.
Draw
ing.Image image = System.
Draw
ing.Image.FromFile(FilePath); int x = image.Width; int y = image.Height; Graphics g = Graphics.FromImage(image); g.
Draw
Image(image, 0, 0, image.Width, image.Height); Font f = new Font(fontname, fontsize ); Brush b = new SolidBrush(Color.Red );
string
addText = watermarkText.Trim(); //g.
Draw
String
(addText, f, b, x - 500, y - 50); g.
Draw
String
(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.To
String
()+","+ fontDialog1.Font.Size.To
String
(); } } private void button3_Click(object sender, EventArgs e) { this.Close(); } } }
graphics2D
中
抽象方法
graphics2D
.
draw
String
()的实现
我写这篇博的原因: 首先
Graphics2D
是抽象类,里面大部分方法是抽象方法,但是如
graphics2D
.
draw
String
("Hello",0,200);进行绘图不需要自己重写,直接可用,这是为什么? 先给出结论 总结: 类的继承关系 1:Graphics->
Graphics2D
->Sun
Graphics2D
2:GraphicsEnvironment->S...
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