SpringMVC 实现国际化与图片验证码

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

<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

@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

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 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

 <!-- 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