struts2 单文件上传

1 单文件上传

1. 第一步

 <form action="${pageContext.request.contextPath }/upload" method="post" enctype="multipart/form-data">
          <input  type="file" name="file1" />
          <input type="submit" value="上传"/> 
       
      
      </form>

 2. 第二步：struts2 的配置文件

 3. 第三步：

4. 第四步：逻辑实现

 2  文件下载

1. 第一步：

2. 第二步：

 3. 第三步：

 4. 第四步：

 3 验证码

1. 第一步：引入两个工具类

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.Random;

import javax.imageio.ImageIO;

/**
*  @package com.baizhi.bxy.util
*  @author  ImageCodeUtil.java  
*  @ClassName  : ImageCodeUtil  
*  @Version  1.0.0   
*  @ModifiedBy 卜晓�?   
*  @date  2017�?08�?1�? 下午8:34:31
 */
public class ImageCodeUtil {
    /**
     * 验证码难度级�? Simple-数字 Medium-数字和小写字�? Hard-数字和大小写字母
     */
    public enum SecurityCodeLevel {
        Simple, Medium, Hard
    };
    /**
     * 产生默认验证码，4位中等难�?
     *
     * @return
     */
    public static String getSecurityCode() {
        return getSecurityCode(4, SecurityCodeLevel.Medium, false);
    }
    /**
     * 产生长度和难度任意的验证�?
     *
     * @param length
     * @param level
     * @param isCanRepeat
     * @return
     */
    public static String getSecurityCode(int length, SecurityCodeLevel level, boolean isCanRepeat) {
        // 随机抽取len个字�?
        int len = length;
        // 字符集合�?--除去易混淆的数字0,1,字母l,o,O�?
        char[] codes = {
                '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
                'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
        };
        // 根据不同难度截取字符�?
        if (level == SecurityCodeLevel.Simple) {
            codes = Arrays.copyOfRange(codes, 0, 10);
        } else if (level == SecurityCodeLevel.Medium) {
            codes = Arrays.copyOfRange(codes, 0, 36);
        }
        // 字符集和长度
        int n = codes.length;
        // 抛出运行时异�?
        if (len > n && isCanRepeat == false) {
            throw new RuntimeException(String.format("调用SecurityCode.getSecurityCode(%1$s,%2$s,%3$s)出现异常�?" + "当isCanRepeat�?%3$s时，传入参数%1$s不能大于%4$s", len, level, isCanRepeat, n));
        }
        // 存放抽取出来的字�?
        char[] result = new char[len];
        // 判断能否出现重复字符
        if (isCanRepeat) {
            for (int i = 0; i < result.length; i++) {
                // 索引0 and n-1
                int r = (int) (Math.random() * n);
                // 将result中的第i个元素设置为code[r]存放的数�?
                result[i] = codes[r];
            }
        } else {
            for (int i = 0; i < result.length; i++) {
                // 索引0 and n-1
                int r = (int) (Math.random() * n);
                // 将result中的第i个元素设置为code[r]存放的数�?
                result[i] = codes[r];
                // 必须确保不会再次抽取到那个字符，这里用数组中�?后一个字符改写code[r],并将n-1
                codes[r] = codes[n - 1];
                n--;
            }
        }
        return String.valueOf(result);
    }
    /**
     * 生成验证码图�?

     * @param securityCode

     * @return

     */
    public static BufferedImage createImage(String securityCode){

        int codeLength = securityCode.length();//验证码长�?

        int fontSize = 18;//字体大小

        int fontWidth = fontSize+1;

        //图片宽高

        int width = codeLength*fontWidth+6;
        int height = fontSize*2+1;
        //图片

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        Graphics2D g = image.createGraphics();

        g.setColor(Color.WHITE);//设置背景�?

        g.fillRect(0, 0, width, height);//填充背景

        g.setColor(Color.LIGHT_GRAY);//设置边框颜色

        g.setFont(new Font("Arial", Font.BOLD, height-2));//边框字体样式

        g.drawRect(0, 0, width-1, height-1);//绘制边框

        //绘制噪点

        Random rand = new Random();

        g.setColor(Color.LIGHT_GRAY);

        for (int i = 0; i < codeLength*6; i++) {

            int x = rand.nextInt(width);

            int y = rand.nextInt(height);

            g.drawRect(x, y, 1, 1);//绘制1*1大小的矩�?

        }

        //绘制验证�?

        int codeY = height-10;

        g.setColor(new Color(19,148,246));
        
        //Georgia  是个字体，如果想用中文要指定中文字体；eg:"宋体";
        //g.setFont(new Font("Georgia", Font.BOLD, fontSize));
        g.setFont(new Font("宋体", Font.BOLD, fontSize));
        for(int i=0;i<codeLength;i++){
            double deg=new Random().nextDouble()*20;
            g.rotate(Math.toRadians(deg), i*16+13,codeY-7.5);
            g.drawString(String.valueOf(securityCode.charAt(i)), i*16+5, codeY);
            g.rotate(Math.toRadians(-deg), i*16+13,codeY-7.5);
        }
       
        g.dispose();//关闭资源

        return image;

    }
    
    //测试
    public static void main(String[] args) throws IOException{
        //获得随机字符
        String securityCode = getSecurityCode();
        //打印随机字符
        System.out.println("===="+securityCode);
        //生成图片
        BufferedImage image = createImage(securityCode);
        //将生成的验证码图片以png(1.png)的格式输出到D�?        "D:\1.png"   ==  "D:/1.png"
        ImageIO.write(image, "png", new FileOutputStream(new File("D:\4.png")));
    }

  
}

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;

/**
*  @package com.baizhi.bxy.util
*  @author  ImageCodeUtil.java  
*  @ClassName  : ImageCodeUtil  
*  @Version  1.0.0   
*  @ModifiedBy 卜晓�?   
*  @date  2017�?08�?1�? 下午8:34:31
 */

/**
 * 验证码生成器
 * @see 可生成数字�?�大写�?�小写字母及三�?�混合类型的验证�?
 * @see 支持自定义验证码字符数量,支持自定义验证码图片的大�?,支持自定义需排除的特殊字�?,支持自定义干扰线的数�?,支持自定义验证码图文颜色
 */
public class VerifyCodeUtil {
    //使用到Algerian字体，系统里没有的话�?要安装字体，字体只显示大写，去掉�?1,0,i,o几个容易混淆的字�?
    public static final String VERIFY_CODES = "23456789ABCDEFGHJKMNPQRSTUVWXYZabcdefghjkmnpqrstuvwxyz";
    private static Random random = new Random();
 
 
    /**
     * 使用系统默认字符源生成验证码
     * @param verifySize    验证码长�?
     * @return
     */
    public static String generateVerifyCode(int verifySize){
        return generateVerifyCode(verifySize, VERIFY_CODES);
    }
    /**
     * 使用指定源生成验证码
     * @param verifySize    验证码长�?
     * @param sources   验证码字符源
     * @return
     */
    public static String generateVerifyCode(int verifySize, String sources){
        if(sources == null || sources.length() == 0){
            sources = VERIFY_CODES;
        }
        int codesLen = sources.length();
        Random rand = new Random(System.currentTimeMillis());
        StringBuilder verifyCode = new StringBuilder(verifySize);
        for(int i = 0; i < verifySize; i++){
            verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));
        }
        return verifyCode.toString();
    }
 
    /**
     * 生成随机验证码文�?,并返回验证码�?
     * @param w
     * @param h
     * @param outputFile
     * @param verifySize
     * @return
     * @throws IOException
     */
    public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{
        String verifyCode = generateVerifyCode(verifySize);
        outputImage(w, h, outputFile, verifyCode);
        return verifyCode;
    }
 
    /**
     * 输出随机验证码图片流,并返回验证码�?
     * @param w
     * @param h
     * @param os
     * @param verifySize
     * @return
     * @throws IOException
     */
    public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{
        String verifyCode = generateVerifyCode(verifySize);
        outputImage(w, h, os, verifyCode);
        return verifyCode;
    }
 
    /**
     * 生成指定验证码图像文�?
     * @param w
     * @param h
     * @param outputFile
     * @param code
     * @throws IOException
     */
    public static void outputImage(int w, int h, File outputFile, String code) throws IOException{
        if(outputFile == null){
            return;
        }
        File dir = outputFile.getParentFile();
        if(!dir.exists()){
            dir.mkdirs();
        }
        try{
            outputFile.createNewFile();
            FileOutputStream fos = new FileOutputStream(outputFile);
            outputImage(w, h, fos, code);
            fos.close();
        } catch(IOException e){
            throw e;
        }
    }
 
    public static BufferedImage getImage(int w,int h,String code){
        int verifySize = code.length();
        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Random rand = new Random();
        Graphics2D g2 = image.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
        Color[] colors = new Color[5];
        Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,
                Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
                Color.PINK, Color.YELLOW };
        float[] fractions = new float[colors.length];
        for(int i = 0; i < colors.length; i++){
            colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
            fractions[i] = rand.nextFloat();
        }
        Arrays.sort(fractions);
 
        g2.setColor(Color.GRAY);// 设置边框�?
        g2.fillRect(0, 0, w, h);
 
        Color c = getRandColor(200, 250);
        g2.setColor(c);// 设置背景�?
        g2.fillRect(0, 2, w, h-4);
 
        //绘制干扰�?
        Random random = new Random();
        g2.setColor(getRandColor(160, 200));// 设置线条的颜�?
        for (int i = 0; i < 20; i++) {
            int x = random.nextInt(w - 1);
            int y = random.nextInt(h - 1);
            int xl = random.nextInt(6) + 1;
            int yl = random.nextInt(12) + 1;
            g2.drawLine(x, y, x + xl + 40, y + yl + 20);
        }
 
        // 添加噪点
        float yawpRate = 0.05f;// 噪声�?
        int area = (int) (yawpRate * w * h);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(w);
            int y = random.nextInt(h);
            int rgb = getRandomIntColor();
            image.setRGB(x, y, rgb);
        }
 
        shear(g2, w, h, c);// 使图片扭�?
 
        g2.setColor(getRandColor(100, 160));
        int fontSize = h-4;
        Font font = new Font("Algerian", Font.ITALIC, fontSize);
        g2.setFont(font);
        char[] chars = code.toCharArray();
        for(int i = 0; i < verifySize; i++){
            AffineTransform affine = new AffineTransform();
            affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);
            g2.setTransform(affine);
            g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);
        }
 
        g2.dispose();
        return image;
    }
 
    /**
     * 输出指定验证码图片流
     * @param w
     * @param h
     * @param os
     * @param code
     * @throws IOException
     */
    public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{
        BufferedImage image = getImage(w,h,code);
        ImageIO.write(image, "jpg", os);
    }
 
    private static Color getRandColor(int fc, int bc) {
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }
 
    private static int getRandomIntColor() {
        int[] rgb = getRandomRgb();
        int color = 0;
        for (int c : rgb) {
            color = color << 8;
            color = color | c;
        }
        return color;
    }
 
    private static int[] getRandomRgb() {
        int[] rgb = new int[3];
        for (int i = 0; i < 3; i++) {
            rgb[i] = random.nextInt(255);
        }
        return rgb;
    }
 
    private static void shear(Graphics g, int w1, int h1, Color color) {
        shearX(g, w1, h1, color);
        shearY(g, w1, h1, color);
    }
 
    private static void shearX(Graphics g, int w1, int h1, Color color) {
 
        int period = random.nextInt(2);
 
        boolean borderGap = true;
        int frames = 1;
        int phase = random.nextInt(2);
 
        for (int i = 0; i < h1; i++) {
            double d = (double) (period >> 1)
                    * Math.sin((double) i / (double) period
                    + (6.2831853071795862D * (double) phase)
                    / (double) frames);
            g.copyArea(0, i, w1, 1, (int) d, 0);
            if (borderGap) {
                g.setColor(color);
                g.drawLine((int) d, i, 0, i);
                g.drawLine((int) d + w1, i, w1, i);
            }
        }
 
    }
 
    private static void shearY(Graphics g, int w1, int h1, Color color) {
 
        int period = random.nextInt(40) + 10; // 50;
 
        boolean borderGap = true;
        int frames = 20;
        int phase = 7;
        for (int i = 0; i < w1; i++) {
            double d = (double) (period >> 1)
                    * Math.sin((double) i / (double) period
                    + (6.2831853071795862D * (double) phase)
                    / (double) frames);
            g.copyArea(i, 0, 1, h1, 0, (int) d);
            if (borderGap) {
                g.setColor(color);
                g.drawLine(i, (int) d, i, 0);
                g.drawLine(i, (int) d + h1, i, h1);
            }
 
        }
 
    }
    public static void main(String[] args) throws IOException{

        //生成验证码随机字�?(位数)
        String generateVerifyCode = generateVerifyCode(4);
        //打印随机字符
        System.out.println(generateVerifyCode);
        //生成图片(宽度，高度，随即字符)
        BufferedImage image = getImage(255, 80, generateVerifyCode);
        //将生成的验证码图片保存到本地
        ImageIO.write(image, "png", new FileOutputStream(new File("D:\1.png")));
    }
}

2.第二步：  jsp 表单页面

3. 第三步：