java servlet图片,java servlet无刷新上传图片文件并裁剪demo代码（Jcrop）

青旅半醒 2023-01-15 08:24 2阅读 0赞

package servlet;

import java.awt.Rectangle;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.PrintWriter;

import java.util.Iterator;

import java.util.List;

import javax.imageio.ImageIO;

import javax.imageio.ImageReadParam;

import javax.imageio.ImageReader;

import javax.imageio.stream.ImageInputStream;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class ImgServlet extends HttpServlet\{

/\*\*

\*/

private static final long serialVersionUID = 1L;

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException \{

System.out.println(2);

String x=req.getParameter("x");

String y=req.getParameter("y");

String w=req.getParameter("w");

String h=req.getParameter("h");

String img=req.getParameter("img");

System.out.println(img);

String file="";

System.out.println(img.substring(img.lastIndexOf("/")+1,img.length()));

System.out.println(req.getSession().getServletContext().getRealPath("/"));

String s="/upload/"+img.substring(img.lastIndexOf("/")+1,img.length());

System.out.println(s);

try \{

file=cutImg(new File(req.getSession().getServletContext().getRealPath("/")+s),Integer.valueOf(x),Integer.valueOf(y),Integer.valueOf(w),Integer.valueOf(h));

\} catch (NumberFormatException e) \{

// TODO Auto-generated catch block

e.printStackTrace();

\} catch (Exception e) \{

// TODO Auto-generated catch block

e.printStackTrace();

PrintWriter out = resp.getWriter();

System.out.println(file.substring(file.indexOf("u"),file.length()));

out.println(file.substring(file.indexOf("u"),file.length()));

out.flush();

@SuppressWarnings("unchecked")

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException \{

req.setCharacterEncoding("utf-8");

resp.setContentType("text/html;charset=utf-8");

DiskFileItemFactory factory = new DiskFileItemFactory();

ServletFileUpload sfu = new ServletFileUpload(factory);

try \{

List items = sfu.parseRequest(req);

for (int i = 0; i < items.size(); i++) \{

FileItem item = items.get(i);

if(!item.isFormField())\{

ServletContext sctx = getServletContext();

String path = sctx.getRealPath("/upload");

// System.out.println(path);

//获得文件名

String fileName = item.getName();

// System.out.println(fileName);

fileName = fileName.substring(fileName.lastIndexOf("/")+1);

File file = new File(path+"\\\\"+fileName);

if(!file.exists())\{

item.write(file);

String str="/img/upload\\\\"+fileName;

req.setAttribute("img\_path", str.replaceAll("\\\\\\\\", "/"));

req.getRequestDispatcher("img\_success.jsp").forward(req, resp);

\} catch (FileUploadException e) \{

// TODO Auto-generated catch block

e.printStackTrace();

\} catch (Exception e) \{

// TODO Auto-generated catch block

e.printStackTrace();

@SuppressWarnings("unchecked")

public String cutImg(File file,Integer x,Integer y,Integer w,Integer h) throws Exception\{

// 取得图片读入器

Iterator readers = ImageIO.getImageReadersByFormatName("jpg");

ImageReader reader = (ImageReader)readers.next();

// 取得图片读入流

InputStream source=new FileInputStream(file);

ImageInputStream iis = ImageIO.createImageInputStream(source);

reader.setInput(iis, true);

// 图片参数

ImageReadParam param = reader.getDefaultReadParam();

Rectangle rect = new Rectangle(x,y,w,h);

param.setSourceRegion(rect);

BufferedImage bi = reader.read(0,param);

ImageIO.write(bi, "jpg",file);

return file.getAbsolutePath();

java servlet图片,java servlet无刷新上传图片文件并裁剪demo代码（Jcrop）

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