java上传图片裁剪
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1銆丳athUtil.java:
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2銆両mageUtil.java:
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2銆乼est.java:
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② Java在jsp中 如何上传图片 在上传时可以取到图片大小并修改
用第三方工具去取 common-upload,具体取到图片的方法参考代码如下：
FileItemFactory fileItemFactory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(fileItemFactory);
upload.setHeaderEncoding("utf-8");
try {
List<FileItem> items = upload.parseRequest(request);
for (FileItem fileItem : items) {
System.out.println("fileName=" + fileItem.getFieldName());
//获取文件流
InputStream in = fileItem.getInputStream();
ServletContext context = getServletConfig().getServletContext();
String path = context.getRealPath("image");
System.out.println(path);
OutputStream out = new FileOutputStream(new File(path + "\\" + fileItem.getName()));
byte[] buffer = new byte[1024];
int len = 0;
while((len = in.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
out.close();
in.close();
System.out.println("写入完毕");
}
} catch (FileUploadException e) {
e.printStackTrace();
}
③ 上传图片，实现图片压缩 java.lang.IllegalArgumentException: Can't load standard profile: GRAY.pf
servlet代码:
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.jspsmart.upload.File;
import com.jspsmart.upload.Files;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;
public class FileUpload extends HttpServlet {
//定义一个ServletConfig对象
private ServletConfig sc;
/**
* Constructor of the object.
*/
public FileUpload() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.flush();
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
response.setContentType("text/html;charset=utf8");
PrintWriter out = response.getWriter();
//新建一个SmartUpload对象，接收用户上传文件
SmartUpload su = new SmartUpload();
su.initialize(sc, request, response);
su.upload();
Files fs = su.getFiles();
File frist = fs.getFile(0);
String filename = frist.getFileName();
String sctm = System.currentTimeMillis()+"";
//获得文件的扩展名
String ext = frist.getFileExt();
//把文件保存到服务器硬盘(以系统毫秒数命名)
frist.saveAs("/"+sctm+"."+ext);
String username = su.getRequest().getParameter("username");
System.out.println(username);
out.flush();
out.close();
} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void init(ServletConfig sc) throws ServletException {
// Put your code here
this.sc = sc;
}
}
jsp代码:
<body>
<form action="fileUpload" method="post" enctype="multipart/form-data">
<input type="file" name="fileXXX" /><!-- 不懈这个name就接收不到,使用不到 -->
用户名:<input type="text" name="username" />
<br/>
<input type="submit" />
</form>
</body>
④ java上传图片 生成缩略图，如果上传的图片尺寸比较小就压缩处理
//将图按比例缩小。
public static BufferedImage resize(BufferedImage source, int targetW, int targetH) {
// targetW，targetH分别表示目标长和宽
int type = source.getType();
BufferedImage target = null;
double sx = (double) targetW / source.getWidth();
double sy = (double) targetH / source.getHeight();
//这里想实现在targetW，targetH范围内实现等比缩放。如果不需要等比缩放
//则将下面的if else语句注释即可
if(sx>sy)
{
sx = sy;
targetW = (int)(sx * source.getWidth());
}else{
sy = sx;
targetH = (int)(sy * source.getHeight());
}
if (type == BufferedImage.TYPE_CUSTOM) { //handmade
ColorModel cm = source.getColorModel();
WritableRaster raster = cm.(targetW, targetH);
boolean alphaPremultiplied = cm.isAlphaPremultiplied();
target = new BufferedImage(cm, raster, alphaPremultiplied, null);
} else
target = new BufferedImage(targetW, targetH, type);
Graphics2D g = target.createGraphics();
//smoother than exlax:
g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY );
g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy));
g.dispose();
return target;
}
public static void saveImageAsJpg (String fromFileStr,String saveToFileStr,int width,int hight)
throws Exception {
BufferedImage srcImage;
// String ex = fromFileStr.substring(fromFileStr.indexOf("."),fromFileStr.length());
String imgType = "JPEG";
if (fromFileStr.toLowerCase().endsWith(".png")) {
imgType = "PNG";
}
// System.out.println(ex);
File saveFile=new File(saveToFileStr);
File fromFile=new File(fromFileStr);
srcImage = ImageIO.read(fromFile);
if(width > 0 || hight > 0)
{
srcImage = resize(srcImage, width, hight);
}
ImageIO.write(srcImage, imgType, saveFile);
}
public static void main (String argv[]) {
try{
//参数1(from),参数2(to),参数3(宽),参数4(高)
saveImageAsJpg("C:\\Documents and Settings\\xugang\\桌面\\tmr-06.jpg",
"C:\\Documents and Settings\\xugang\\桌面\\2.jpg",
120,120);
} catch(Exception e){
e.printStackTrace();
}
}
⑤ java图片裁剪后图片失真，这是怎么回事呢
输入和输出格式不对吧，比如用bmp读入，png输出。。。。
⑥ 如何在Java中进行图片剪裁 疯狂JAVA
packagetest;
importjava.awt.Color;
importjava.awt.Graphics2D;
importjava.awt.Image;
importjava.awt.geom.AffineTransform;
importjava.awt.image.AffineTransformOp;
importjava.awt.image.BufferedImage;
importjava.io.File;
importjava.io.IOException;
importjava.nio.Buffer;
importjavax.imageio.ImageIO;
importjavax.imageio.stream.ImageOutputStream;
/**
*裁剪、缩放图片工具类
*
*@authorCSDN没有梦想-何必远方
*/
publicclassImgUtils{
/**
*缩放图片方法
*
*@paramsrcImageFile
*要缩放的图片路径
*@paramresult
*缩放后的图片路径
*@paramheight
*目标高度像素
*@paramwidth
*目标宽度像素
*@parambb
*是否补白
*/
publicfinalstaticvoidscale(StringsrcImageFile,Stringresult,
intheight,intwidth,booleanbb){
try{
doubleratio=0.0;//缩放比例
Filef=newFile(srcImageFile);
BufferedImagebi=ImageIO.read(f);
Imageitemp=bi.getScaledInstance(width,height,bi.SCALE_SMOOTH);//bi.SCALE_SMOOTH
//选择图像平滑度比缩放速度具有更高优先级的图像缩放算法。
//计算比例
if((bi.getHeight()>height)||(bi.getWidth()>width)){
doubleratioHeight=(newInteger(height)).doubleValue()
/bi.getHeight();
doubleratioWhidth=(newInteger(width)).doubleValue()
/bi.getWidth();
if(ratioHeight>ratioWhidth){
ratio=ratioHeight;
}else{
ratio=ratioWhidth;
}
AffineTransformOpop=newAffineTransformOp(AffineTransform//仿射转换
.getScaleInstance(ratio,ratio),null);//返回表示剪切变换的变换
itemp=op.filter(bi,null);//转换源BufferedImage并将结果存储在目标
//BufferedImage中。
}
if(bb){//补白
BufferedImageimage=newBufferedImage(width,height,
BufferedImage.TYPE_INT_RGB);//构造一个类型为预定义图像类型之一的
//BufferedImage。
Graphics2Dg=image.createGraphics();//创建一个
//Graphics2D，可以将它绘制到此
//BufferedImage中。
g.setColor(Color.white);//控制颜色
g.fillRect(0,0,width,height);//使用Graphics2D上下文的设置，填充Shape
//的内部区域。
if(width==itemp.getWidth(null))
g.drawImage(itemp,0,(height-itemp.getHeight(null))/2,
itemp.getWidth(null),itemp.getHeight(null),
Color.white,null);
else
g.drawImage(itemp,(width-itemp.getWidth(null))/2,0,
itemp.getWidth(null),itemp.getHeight(null),
Color.white,null);
g.dispose();
itemp=image;
}
ImageIO.write((BufferedImage)itemp,"JPEG",newFile(result));//输出压缩图片
}catch(IOExceptione){
e.printStackTrace();
}
}
/**
*裁剪图片方法
*
*@parambufferedImage
*图像源
*@paramstartX
*裁剪开始x坐标
*@paramstartY
*裁剪开始y坐标
*@paramendX
*裁剪结束x坐标
*@paramendY
*裁剪结束y坐标
*@return
*/
(BufferedImagebufferedImage,
intstartX,intstartY,intendX,intendY){
intwidth=bufferedImage.getWidth();
intheight=bufferedImage.getHeight();
if(startX==-1){
startX=0;
}
if(startY==-1){
startY=0;
}
if(endX==-1){
endX=width-1;
}
if(endY==-1){
endY=height-1;
}
BufferedImageresult=newBufferedImage(endX-startX,endY-startY,
4);
for(intx=startX;x<endX;++x){
for(inty=startY;y<endY;++y){
intrgb=bufferedImage.getRGB(x,y);
result.setRGB(x-startX,y-startY,rgb);
}
}
returnresult;
}
publicstaticvoidmain(String[]args)throwsIOException{
Fileinput=newFile("input.jpg");
BufferedImageimg=ImageIO.read(input);
cropImage(img,10,10,20,20);
Fileoutput=newFile("output.jpg");
ImageIO.write(img,"jpg",output);
}
}
⑦ 服务器端 验证上传图片 格式的 正则 (java)
用字符串判断性能比正则好，
String imgExt = "jpg|jpeg|png|bmp|GIF|JPG|PNG|JPEG";
imgExt .indexOf("图片后缀") >= 0
或者 imgExt .contains("图片后缀")
这两种就可以