SpringMVC 实现国际化与图片验证码

我就是我 2023-10-17 08:04 11阅读 0赞

**一、生成图片验证码（一般在登陆、注册、找回密码等使用）**

（1）生成图片类

@Component
    public class RandomValidateCode {
    
        /**
         * 生成代码
         * 
         * @return
         */
        public static String createValidateCode(int size) {
            String seed = "1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
            int len = seed.length();
            char[] p = new char[size];
            for (int i = 0; i < size; i++) {
                p[i] = seed.charAt((int) Math.floor(Math.random() * len));
            }
            return new String(p);
        }
    
        //产生随机数
        private final Random random = new Random();
    
        private final String randString = "123456789ABCDEFGHIJKLMNPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";// 随机产生的字符串
        private final int width = 135;// 图片宽
        private final int height = 40;// 图片高
        private final int lineSize = 50;// 干扰线数量
        private final int stringNum = 4;// 随机产生字符数量
    
        private final int fontSize = 30;// 随机产生字符数量
    
        /**
         * 生成随机图片
         */
        public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
            HttpSession session = request.getSession();
            // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
            BufferedImage image = new BufferedImage(this.width, this.height, BufferedImage.TYPE_INT_BGR);
            Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
            g.fillRect(0, 0, this.width, this.height);
            g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, this.fontSize));
            g.setColor(this.getRandColor(110, 133));
            // 绘制干扰线
            for (int i = 0; i <= this.lineSize; i++) {
                this.drawLine(g);
            }
            // 绘制随机字符
            String randomString = "";
            for (int i = 1; i <= this.stringNum; i++) {
                randomString = this.drawString(g, randomString, i);
            }
            //删除保存的图片验证
            session.removeAttribute(Constants.RANDOM_CODE_KEY);
            //保存的图片验证
            session.setAttribute(Constants.RANDOM_CODE_KEY, randomString);
            // System.out.println(randomString);
            g.dispose();
            try {
                // 禁止图像缓存。
                response.setHeader("Pragma", "no-cache");
                response.setHeader("Cache-Control", "no-cache");
                response.setDateHeader("Expires", 0);
                // 将内存中的图片通过流动形式输出到客户端
                ImageIO.write(image, "JPEG", response.getOutputStream());
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        /**
         * 获取随机的字符
         */
        public String getRandomString(int num) {
            return String.valueOf(this.randString.charAt(num));
        }
    
        /**
         * 绘制干扰线
         */
        private void drawLine(Graphics g) {
            int x = this.random.nextInt(this.width);
            int y = this.random.nextInt(this.height);
            int xl = this.random.nextInt(13);
            int yl = this.random.nextInt(15);
            g.drawLine(x, y, x + xl, y + yl);
        }
    
        /**
         * 绘制字符串
         */
        private String drawString(Graphics g, String randomString, int i) {
            g.setFont(this.getFont());
            g.setColor(new Color(this.random.nextInt(155), this.random.nextInt(123), this.random.nextInt(176)));
            String rand = String.valueOf(this.getRandomString(this.random.nextInt(this.randString.length())));
            randomString += rand;
            g.translate(this.random.nextInt(3), this.random.nextInt(3));
            g.drawString(rand, (this.width / this.stringNum - 14) * i, this.height - 7);
            return randomString;
        }
    
        /**
         * 获得字体
         */
        private Font getFont() {
            return new Font("Times New Roman", Font.CENTER_BASELINE, this.fontSize);
        }
    
        /**
         * 获得颜色
         */
        private Color getRandColor(int fc, int bc) {
            if (fc > 255) {
                fc = 255;
            }
            if (bc > 255) {
                bc = 255;
            }
            int r = fc + this.random.nextInt(bc - fc - 16);
            int g = fc + this.random.nextInt(bc - fc - 14);
            int b = fc + this.random.nextInt(bc - fc - 18);
            return new Color(r, g, b);
        }
    }

（2）常量 类Constants

public static final String RANDOM_CODE_KEY = "RANDOM_CODE_KEY";

（3）JSP页面 login.jsp

（4）控制类

@Controller
    public class ToolController {
    
    	@RequestMapping("toPage")
    	public String toPage(@RequestParam String pageName) {
    		// return "/WEB-INF/jsp/"+pageName+".jsp";
    		return pageName;
    
    	}
    
    	// 随机产生的图片
    	@Resource
    	RandomValidateCode randomValidateCode;
    
    	@RequestMapping("/pcode")
    	public void pcode(HttpServletRequest request, HttpServletResponse response) {
    		randomValidateCode.getRandcode(request, response);
    
    	}
    
    	@RequestMapping("/doLogin")
    	public String doLogin(HttpServletRequest request,
    			HttpServletResponse response, @RequestParam String pcode) {
    		// 获得图片验证码
    		String code = (String) request.getSession().getAttribute(
    				Constants.RANDOM_CODE_KEY);
    
    		// 判断是否是相同
    		if (pcode.equals(code)) {
    			return "i18n"; // 跳转到i18n.jsp页面
    		} else {
    			if (pcode == null || pcode.equals("")) {
    				System.out.println("pcode=0==>");
    
    			} else {
    				// 保存错误消息
    				request.setAttribute("error", "验证码出错！");
    			}
    			return "login"; // 跳转到login.jsp页面
    
    		}
    
    	}
    }

(5)效果

![Center][]

单击图片

![Center 1][]

输入的与图片验证不一致

![Center 2][]

输入一致,跳转到正确页面

![Center 3][]

二、国际化

常把I18N作为“国际化”的简称，是英文单词 internationalization的首末字符i和n。18为中间的字符数。

（1） Spring通过实现MessageSource接口，来支持国际化

（2） ResourceBundleMessageSource是一个常用的实现

（3） 使用LocaleResolver接口的实现类实现本地化信息的解析

（4） 使用LocaleChangeInterceptor实现本地化信息的监听

（1）在src/main/resources 创建i18n包下存放资源文件

![Center 4][]

message\_en.properties

title=this is test internationalization
    display=this is display
    login.title=picture validate

message\_zh.properties

title=\u6D4B\u8BD5\u56FD\u9645\u5316
    display=\u6D4B\u8BD5\u663E\u793A
    login.title=\u56FE\u7247\u9A8C\u8BC1

(2)本地过滤器语言

package com.hlx.filter;
    
    import java.io.IOException;
    import java.util.Locale;
    
    import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.http.Cookie;
    import javax.servlet.http.HttpServletRequest;
    
    import org.hibernate.validator.internal.util.privilegedactions.NewInstance;
    import org.springframework.web.servlet.i18n.SessionLocaleResolver;
    /**
     * 过滤器
     * @author Administrator
     *
     */
    public class LocalFilter implements Filter {
    
    	@Override
    	public void destroy() {
    		// TODO Auto-generated method stub
    
    	}
    
    	@Override
    	public void doFilter(ServletRequest arg0, ServletResponse arg1,
    			FilterChain arg2) throws IOException, ServletException {
    		// 默认的语言
    		String language="zh";
    		//用cookie来获取
    		Cookie[] cookies = ((HttpServletRequest)arg0).getCookies();
    		//判断
    		if (cookies!=null &&cookies.length>0) {
    			for (Cookie cookie : cookies) {
    				//判断是不是language
    				if("language".equals(cookie.getName())){
    					language  = cookie.getValue(); //获得值
    				}
    			}
    			
    		}
    		System.out.println("change in language="+language);
    		//保存语言
    		((HttpServletRequest)arg0).getSession().setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, new Locale(language));
    		
    		//过滤下一个链
    		arg2.doFilter(arg0, arg1);
    
    	}
    
    	@Override
    	public void init(FilterConfig arg0) throws ServletException {
    		// TODO Auto-generated method stub
    
    	}
    
    }

必须在web.xml文件中配置

<filter>
       <filter-name>LocalFiter</filter-name>
       <filter-class>com.hlx.filter.LocalFilter</filter-class>
      </filter>
      <filter-mapping>
       <filter-name>LocalFiter</filter-name>
       <url-pattern>*.html</url-pattern>
      </filter-mapping>
      <filter-mapping>
       <filter-name>LocalFiter</filter-name>
       <url-pattern>*.jsp</url-pattern>
      </filter-mapping>

(3)配置spring-mvc.xml文件

<bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver">
    	     <property name="defaultLocale" value="zh"/>
    	   </bean>
    	    
    	   <mvc:interceptors>
    	    <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"/>
    	   </mvc:interceptors>
    	   
    	   
    	   <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
    	     <property name="basename" value="i18n/message"/> 
    	     <property name="defaultEncoding"  value="utf-8"/>
    	     <property name="useCodeAsDefaultMessage" value="true"/>
    	   </bean>

(4)Jsp页面 i18n.jsp

![Center 5][]

(5)效果，可以来回的切换中英文

![Center 6][]  
![Center 7][]

[Center]: https://img-blog.csdn.net/20160721112614600?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: https://img-blog.csdn.net/20160721112629381?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 2]: https://img-blog.csdn.net/20160721112657104?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 3]: https://img-blog.csdn.net/20160721112755480?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 4]: https://img-blog.csdn.net/20160721113612148?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 5]: https://img-blog.csdn.net/20160721114910572?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 6]: https://img-blog.csdn.net/20160721114652014?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 7]: https://img-blog.csdn.net/20160721114700131?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center