java繪圖相關(guān)類

驗(yàn)證碼工具類

package dt2008.util;

import javax.imageio.ImageIO;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.util.Random;

/**

* 驗(yàn)證碼工具類

*/

public class RandomValidateCodeUtil {

//定義隨機(jī)類

private Random random = new Random();

public void code(HttpServletRequest request, HttpServletResponse response){

//1.創(chuàng)建緩存圖片類

//構(gòu)造方法：new BufferedImage(int width,int height,int model)

BufferedImage image = new BufferedImage(150,50,BufferedImage.TYPE_INT_RGB);

//2.獲取畫(huà)筆

Graphics g = image.getGraphics();

//3.設(shè)置畫(huà)筆顏色

g.setColor(Color.white);//白色

//4.填充矩形

//g.fillRect(x,y,width,height); x,y 起點(diǎn)的坐標(biāo)，width矩形寬度，height矩形的高度

g.fillRect(0,0,150,50);

//5.畫(huà)矩形邊框

//設(shè)置畫(huà)筆顏色(邊框的顏色)

g.setColor(Color.blue);//藍(lán)色

//畫(huà)邊框的語(yǔ)法：g.drawRect(x,y,width,height); x,y 起點(diǎn)的坐標(biāo)，width邊框?qū)挾?#xff0c;height邊框的高度

g.drawRect(1,1,147,47);

//6.畫(huà)4條干擾線

//畫(huà)直線語(yǔ)法：g.drawLine(x1,y1,x2,y2); x1,y1 線的起點(diǎn)坐標(biāo)，x2,y2先的終點(diǎn)坐標(biāo)

for (int i = 0; i < 4; i++) {

//設(shè)置畫(huà)筆為隨機(jī)顏色

g.setColor(getRandomColor());

//隨機(jī)獲取2個(gè)點(diǎn)

int x1 = random.nextInt(147)+1;

int y1 = random.nextInt(47)+1;

int x2 = random.nextInt(147)+1;

int y2 = random.nextInt(47)+1;

//畫(huà)直線

g.drawLine(x1,y1,x2,y2);

}

//7.畫(huà)驗(yàn)證碼字符串

String checkCodeScope = "qwertyupasdfghjkzxcvbnm";

//定義接收拼接隨機(jī)獲取到的驗(yàn)證碼字符變量

StringBuilder checkCodeBuilder = new StringBuilder();

//循環(huán)隨機(jī)獲取4個(gè)驗(yàn)證碼字符

for (int i = 0; i < 4; i++) {

//獲取隨機(jī)位置

int index = random.nextInt(checkCodeScope.length());

//根據(jù)位置獲取字符

char c = checkCodeScope.charAt(index);

//checkCodeBuilder拼接獲取的隨機(jī)字符

checkCodeBuilder.append(c);

//設(shè)置畫(huà)筆的字體

//字符構(gòu)造方法：new Font(字體，樣式，大小)

g.setFont(new Font("微軟雅黑",Font.BOLD,20));

//將每個(gè)字符畫(huà)到圖片上

//語(yǔ)法：g.drawString(字符串,x,y);

g.drawString(c+"",30+i*30,30);

}

request.getSession().setAttribute("SESSION_CHECKCODE", checkCodeBuilder.toString());

//8.將驗(yàn)證碼圖片輸出給瀏覽器

//輸出緩存圖片的語(yǔ)法：ImageIO.write(緩存圖片,圖片的格式,輸出給瀏覽器的字節(jié)流);

try {

ImageIO.write(image,"png",response.getOutputStream());

} catch (IOException e) {

e.printStackTrace();

}

}

//獲取隨機(jī)的顏色

private Color getRandomColor(){

int r = random.nextInt(256);

int g = random.nextInt(256);

int b = random.nextInt(256);

//構(gòu)造方法語(yǔ)法：new Color(int r,int g,int b) //由紅、綠、藍(lán)組成， 每個(gè)顏色值范圍0~255

return new Color(r,g,b);

}

}

Controller(生成驗(yàn)證碼)

package yingshi.web;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.RestController;

import yingshi.util.RandomValidateCodeUtil;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import java.io.IOException;

/**

* 登錄以及驗(yàn)證碼

*/

@RestController

@RequestMapping("login/admin")

public class LoginController {

/**

* 生成驗(yàn)證碼

*/

@RequestMapping("getVerify")

public void getVerify(HttpServletRequest request, HttpServletResponse response) {

RandomValidateCodeUtil randomValidateCodeUtil = new RandomValidateCodeUtil();

randomValidateCodeUtil.code(request, response);

}

}

這時(shí)，可以訪問(wèn)驗(yàn)證碼了，可以在前端那寫(xiě)個(gè)js點(diǎn)擊切換驗(yàn)證碼

接下來(lái)就是校驗(yàn)驗(yàn)證碼(注意：是分大小寫(xiě)的)

package yingshi.web;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.RestController;

import yingshi.util.RandomValidateCodeUtil;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import java.io.IOException;

/**

* 登錄以及驗(yàn)證碼

*/

@RestController

@RequestMapping("login/admin")

public class LoginController {

/**

* 校驗(yàn)后臺(tái)登錄

*/

@RequestMapping("checkVerify")

public String checkVerify(String username, String password, String verifyInput, HttpServletRequest request, HttpServletResponse response) {

//驗(yàn)證碼校驗(yàn)

//獲取session中的驗(yàn)證碼

String sessionCheckCode = (String) request.getSession().getAttribute("SESSION_CHECKCODE");

//判斷驗(yàn)證碼是否正確

if(!verifyInput.equals(sessionCheckCode)){

return "錯(cuò)誤";

}else{

return "正確";

}

}

}

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