SpringMVC 实现国际化与图片验证码

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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

@Componentpublic 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

<script type="text/javascript">var i = 1;function fun() {document.getElementById("pcode").src = "pcode.html?v=" + (i++);  //翻下1张图片}</script><body><div style="margin: 0 auto; margin-top: 100px; background:snow"><form method="post" action="doLogin.html" name="form1"><p><input type="text" name="pcode"><!-- 单击图片都可以换下一张 --> <input id="pcode" type="image" src="pcode.html" onclick="fun()">  <input type="submit" /></p></form>${error}</div></body></html>

（4）控制类

@Controllerpublic 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@ResourceRandomValidateCode 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

单击图片

输入的与图片验证不一致

输入一致,跳转到正确页面

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

message_en.properties

title=this is test internationalizationdisplay=this is displaylogin.title=picture validate

message_zh.properties

title=\u6D4B\u8BD5\u56FD\u9645\u5316display=\u6D4B\u8BD5\u663E\u793Alogin.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 {@Overridepublic void destroy() {// TODO Auto-generated method stub}@Overridepublic 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languageif("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);}@Overridepublic void init(FilterConfig arg0) throws ServletException {// TODO Auto-generated method stub}}

必须在web.xml文件中配置

 <!-- 配置过滤器 -->  <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

  <!-- 配置默认的语言，过滤器 -->   <bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver">     <property name="defaultLocale" value="zh"/>   </bean>    <!-- 过滤器 (语言发生变化时触发) -->   <mvc:interceptors>    <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"/>   </mvc:interceptors>      <!--(3) 配置资源文件 -->   <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">     <property name="basename" value="i18n/message"/> <!-- 资源文件的名称 -->     <property name="defaultEncoding"  value="utf-8"/><!-- 文件编码 -->     <property name="useCodeAsDefaultMessage" value="true"/><!-- 不存在对应的资源，那么就用code名字为值 -->   </bean>

(4)Jsp页面 i18n.jsp

<script type="text/javascript">      function changLang(lang){      //日期      var days  = new Date();      //1年      days.setDate(days.getDate()+365);            //会话      document.cookie = "language="+lang+";expires="+days.toGMTString();            //刷新      location.reload();          }    </script>    <body>    <a href="javascript:changLang('en')">英文</a>    <a href="javascript:changLang('zh')">中文</a>      <div style="margin: 0 auto; margin-top: 100px; background:snow">       <spring:message code="display"></spring:message>    </div>  </body>

(5)效果，可以来回的切换中英文

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