标签：背景色 SOS i++ bool stack image dispatch lower 噪声
https://blog.csdn.net/lzxlfly/article/details/93381526package com.yuantiao.smartcardms.util;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
public class CaptchaCodeUtil {
public static void main(String[] args) throws IOException {
// CaptchaCodeUtil captchaCodeUtil = new CaptchaCodeUtil();
// captchaCodeUtil.createImageCode("changhe");
// captchaCodeUtil.write(new FileOutputStream("d:\\00\\jie1.jpg"));
CaptchaCodeUtil code = CaptchaCodeUtil.of(200, 50, "xiechangzhou");
code.write(new FileOutputStream("d:\\00\\jie1.jpg"));
}
/**
* 验证码图片的宽度
*/
private int width=160;
/**
* 验证码图片的宽度
*/
private int height=40;
/**
* 干扰线的数量
*/
private int lineCount=20;
/**
* 验证码
*/
private String code=null;
/**
* 验证码图片上字符个数
*/
private int codeCount=4;
/**
* 验证码图片Buffer
*/
private BufferedImage buffImg = null;
Random random = new Random();
public CaptchaCodeUtil(){
createImageCode();
}
public static CaptchaCodeUtil of(int width, int height, String code){
CaptchaCodeUtil captchaCodeUtil = new CaptchaCodeUtil(width, height, code.length(), 20, code);
captchaCodeUtil.createImageCode(code);
return captchaCodeUtil;
}
/**
* 指定宽高
* @param width
* @param height
*/
public CaptchaCodeUtil(int width, int height){
this.width=width;
this.height=height;
createImageCode();
}
/**
* 指定宽高和干扰线的数量
* @param width
* @param height
* @param lineCount
*/
public CaptchaCodeUtil(int width, int height, int lineCount){
this.width=width;
this.height=height;
this.lineCount=lineCount;
createImageCode();
}
/**
* 指定宽高、验证码字符个数、干扰线数量
* @param width
* @param height
* @param codeCount
* @param lineCount
*/
public CaptchaCodeUtil(int width, int height, int codeCount, int lineCount){
this.width=width;
this.height=height;
this.codeCount=codeCount;
this.lineCount=lineCount;
createImageCode();
}
/**
* 指定宽高、验证码字符个数、干扰线数量、
* @param width
* @param height
* @param codeCount
* @param lineCount
* @param code
*/
public CaptchaCodeUtil(int width, int height, int codeCount, int lineCount, String code){
this.width=width;
this.height=height;
this.codeCount=codeCount;
this.lineCount=lineCount;
createImageCode(code);
}
/**
* 生成验证码
*/
private void createImageCode(){
// 字体的宽度
int fontWidth = width / codeCount;
// 字体的高度
int fontHeight = height - 5;
// 偏移量
int codeY = height - 8;
// 图像buffer
buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = buffImg.getGraphics();
// 设置背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
// 设置字体
Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
g.setFont(font);
// 设置干扰线
setLine(g);
// 添加噪点
// 噪声率
float yawpRate = 0.01f;
int area = (int) (yawpRate * width * height);
for (int i = 0; i < area; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
buffImg.setRGB(x, y, random.nextInt(255));
}
// 得到随机字符
String str1 = randomStr(codeCount);
this.code = str1;
for (int i = 0; i < codeCount; i++) {
String strRand = str1.substring(i, i + 1);
g.setColor(getRandColor(1, 255));
// a为要画出来的东西，x和y表示要画的东西最左侧字符的基线位于此图形上下文坐标系的 (x, y) 位置处
g.drawString(strRand, i*fontWidth+3, codeY);
}
}
/**
* 生成指定字符图片
*/
private void createImageCode(String code) {
// 字体的宽度
int fontWidth = width / codeCount;
// 字体的高度
int fontHeight = height - 5;
int codeY = height - 8;
// 图像buffer
buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = buffImg.getGraphics();
// 设置背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
// 设置字体
Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
g.setFont(font);
// 设置干扰线
setLine(g);
// 添加噪点
// 噪声率
float yawpRate = 0.01f;
int area = (int) (yawpRate * width * height);
for (int i = 0; i < area; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
buffImg.setRGB(x, y, random.nextInt(255));
}
this.code = code;
for (int i = 0; i < code.length(); i++) {
String strRand = code.substring(i, i + 1);
g.setColor(getRandColor(1, 255));
// a为要画出来的东西，x和y表示要画的东西最左侧字符的基线位于此图形上下文坐标系的 (x, y) 位置处
g.drawString(strRand, i*fontWidth+3, codeY);
}
}
/**
* 设置干扰线
* @param g
*/
private void setLine(Graphics g){
for (int i = 0; i < lineCount; i++) {
int xs = random.nextInt(width);
int ys = random.nextInt(height);
int xe = xs + random.nextInt(width);
int ye = ys + random.nextInt(height);
g.setColor(getRandColor(1, 255));
g.drawLine(xs, ys, xe, ye);
}
}
/**
* 得到随机字符
* @param n
* @return
*/
public String randomStr(int n) {
String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
String str2 = "";
int len = str1.length() - 1;
double r;
for (int i = 0; i < n; i++) {
r = (Math.random()) * len;
str2 = str2 + str1.charAt((int) r);
}
return str2;
}
/**
* 得到随机颜色
* @param fc
* @param bc
* @return
*/
private Color getRandColor(int fc, int bc) {
// 给定范围获得随机颜色
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);
}
/**
* 产生随机字体
*/
private Font getFont(int size) {
Random random = new Random();
Font font[] = new Font[5];
font[0] = new Font("Ravie", Font.PLAIN, size);
font[1] = new Font("Antique Olive Compact", Font.PLAIN, size);
font[2] = new Font("Fixedsys", Font.PLAIN, size);
font[3] = new Font("Wide Latin", Font.PLAIN, size);
font[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, size);
return font[random.nextInt(5)];
}
/**
* 扭曲方法
* @param g
* @param w1
* @param h1
* @param color
*/
private void shear(Graphics g, int w1, int h1, Color color) {
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}
private 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 void shearY(Graphics g, int w1, int h1, Color color) {
int period = random.nextInt(40) + 10;
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 void write(OutputStream sos) throws IOException {
ImageIO.write(buffImg, "png", sos);
sos.close();
}
public BufferedImage getBuffImg() {
return buffImg;
}
public String getCode() {
return code.toLowerCase();
}
}package com.yuantiao.smartcardms.web.user.login;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.yuantiao.smartcardms.dao.domain.result.Result;
import com.yuantiao.smartcardms.dao.domain.result.ResultFactory;
import com.yuantiao.smartcardms.dao.domain.user.SysUser;
import com.yuantiao.smartcardms.dict.user.Dict_session_key;
import com.yuantiao.smartcardms.param.user.LoginParam;
import com.yuantiao.smartcardms.service.user.ISysUserService;
import com.yuantiao.smartcardms.service.user.impl.SysUserServiceImpl;
import com.yuantiao.smartcardms.util.CaptchaCodeUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.RandomStringUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.session.HttpServletSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.time.LocalDateTime;
/**
* @description:
* @author: changzhou.xie@yuantiaokj.com
* @date: 2019/11/1 15:55
*/
@Slf4j
@RequestMapping("/user")
@RestController
public class LoginController {
@Autowired
private ISysUserService sysUserService;
@RequestMapping("/checkCode")
public void checkCode(HttpServletRequest request, HttpServletResponse response){
log.info("[系统用户pc登录图片验证码生成]");
String checkCode = RandomStringUtils.randomAlphanumeric(5);
HttpSession session = request.getSession();
BufferedImage bufferedImage = CaptchaCodeUtil.of(200, 50, checkCode).getBuffImg();
try {
ImageIO.write(bufferedImage, "png", response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
log.info("[系统用户pc登录图片验证码生成]将验证码放入session,checkCode={}", checkCode);
session.setAttribute(Dict_session_key.USER_LOGIN_PC_CHECK_CODE, checkCode);
}
@RequestMapping("/login/pc")
public Result login(@RequestBody LoginParam loginParam, HttpServletRequest request){
log.info("[系统用户pc登录][入参]loginParam={}", JSONObject.toJSONString(loginParam));
if(StringUtils.isBlank(loginParam.getCheckCode())){
return ResultFactory.buildFailResult("验证码不能为空");
}
String sessionCheckCode = (String) request.getSession().getAttribute(Dict_session_key.USER_LOGIN_PC_CHECK_CODE);
request.getSession().removeAttribute(Dict_session_key.USER_LOGIN_PC_CHECK_CODE);
if(null == sessionCheckCode || !sessionCheckCode.equalsIgnoreCase(loginParam.getCheckCode())){
return ResultFactory.buildFailResult("验证码错误");
}
if(StringUtils.isBlank(loginParam.getUsername())){
return ResultFactory.buildFailResult("用户名不能为空");
}
if(StringUtils.isBlank(loginParam.getPassword())){
return ResultFactory.buildFailResult("密码不能为空");
}
UsernamePasswordToken token = new UsernamePasswordToken(loginParam.getUsername(), loginParam.getPassword());
Subject subject = SecurityUtils.getSubject();
try {
subject.login(token);
} catch (IncorrectCredentialsException e) {
return ResultFactory.buildFailResult("用户密码错误");
} catch (UnknownAccountException e){
return ResultFactory.buildFailResult("用户名不存在");
} catch (Exception e){
e.printStackTrace();
return ResultFactory.buildFailResult("用户登录失败");
}
log.info("[系统用户pc登录][用户登录成功]");
//获取登录用户
SysUser sysUser = sysUserService.getOne(Wrappers.<SysUser>lambdaQuery()
.eq(SysUser::getUsername, loginParam.getUsername())
.eq(SysUser::getPassword, loginParam.getPassword())
);
request.getSession().setAttribute(Dict_session_key.CURRENT_USER, sysUser);
//更新登录时间 todo 更新登录时间有问题
boolean update = sysUserService.update(Wrappers.<SysUser>lambdaUpdate()
.eq(SysUser::getId, sysUser.getId())
.set(SysUser::getLoginTime, LocalDateTime.now())
);
if (!update){
log.info("[系统用户pc登录][更新用户登录时间失败]");
}
sysUser.setPassword("***");
return ResultFactory.buildSuccessResult(sysUser);
}
@RequestMapping("/logout")
public void logout(){
log.info("[系统用户pc退出]");
Subject subject = SecurityUtils.getSubject();
subject.logout();
}
}严重: Servlet.service() for servlet [dispatcherServlet] in context with path [/smartcard] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: Cannot create a session after the response has been committed] with root cause
java.lang.IllegalStateException: Cannot create a session after the response has been committed
原因：在response.getOutputStream()之后使用request.getSession()，应该放在前面获取session。标签：背景色 SOS i++ bool stack image dispatch lower 噪声
原文地址：https://www.cnblogs.com/mozq/p/11786024.html
