jsp实现文件上传（一）用jspSmartUpload组件实现文件上传

java类（ImageUtil.java）

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;



import javax.imageio.ImageIO;



public class ImageUtil {

    private BufferedImage i = null;

/*

 * 上传图片

 * */

    public void setImg(String imgpath) {

        try {

            this.i = ImageIO.read(new FileInputStream(imgpath));

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }



    public ImageUtil() {



    }



    public ImageUtil(String imgpath) {

        try {

            this.i = ImageIO.read(new FileInputStream(imgpath));

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

/* 

 * 图片加水印文字

 * */

    public void txt(String s, int fontsize, String imgpath) {

        Graphics g = this.i.getGraphics();

        g.setFont(new Font("隶书", Font.BOLD, fontsize));

        // g.setColor(Color.RED);

        g.setColor(new Color(255, 255, 255, 80));

        g.drawString(s, i.getWidth() - 200, this.i.getHeight() - fontsize - 10);

        try {

            ImageIO.write(this.i, "jpg", new File(imgpath));

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    /* 

     * 图片加水印logo

     * */

    public void logo(String logopath, String imgpath) {

        Graphics g = this.i.getGraphics();

        try {

            BufferedImage logo = ImageIO.read(new File(logopath));

            g.drawImage(logo, this.i.getWidth() - 189 - 10,

                    this.i.getHeight() - 69 - 10, this.i.getWidth() - 10,

                    this.i.getHeight() - 10, 0, 0, logo.getWidth(),

                    logo.getHeight(), null);

            ImageIO.write(this.i, "jpg", new File(imgpath));

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

/* 

     * 缩略图

     * */

public void thumd(int ww, int hh, String imgpath) { int w = this.i.getWidth(); int h = this.i.getHeight(); BufferedImage nimg = new BufferedImage(ww, hh, BufferedImage.TYPE_INT_RGB); Graphics g = nimg.getGraphics(); g.drawImage(this.i, 0, 0, ww, hh, 0, 0, w, h, null); try { ImageIO.write(nimg, "jpg", new File(imgpath)); } catch (IOException e) { e.printStackTrace(); } } }

使用上传照片在jsp中使用

SmartUpload su = new SmartUpload();

su.initialize(pageContext);

su.upload();

ImageUtil iu = new ImageUtil();

for(int i=0;i<su.getFiles().getCount();i++){

    File f = su.getFiles().getFile(i);

    if(f.isMissing()){

        continue;

    }

    UUID u = UUID.randomUUID();

    String path = "/upload/"+u.toString()+"."+f.getFileExt();

    f.saveAs(path);

    String pp = request.getServletContext().getRealPath(path);

    iu.setImg(pp);

}