1、创建一个Maven项目
2、在pom.xml中引入相关依赖
1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
3 <modelVersion>4.0.0</modelVersion>
4 <groupId>com.wisezone</groupId>
5 <artifactId>wdh_kaptcha</artifactId>
6 <packaging>war</packaging>
7 <version>0.0.1-SNAPSHOT</version>
8 <name>wdh_kaptcha Maven Webapp</name>
9 <url>http://maven.apache.org</url>
10
11 <properties>
12 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
13 <!-- 定义spring的版本变量在dependency里面直接引用 -->
14 <spring.version>4.3.2.RELEASE</spring.version>
15 <slf4j.version>1.7.2</slf4j.version>
16 </properties>
17
18 <dependencies>
19 <!-- spring mvc -->
20 <dependency>
21 <groupId>org.springframework</groupId>
22 <artifactId>spring-webmvc</artifactId>
23 <version>${spring.version}</version>
24 </dependency>
25 <!-- web开发要有servlet -->
26 <dependency>
27 <groupId>javax.servlet</groupId>
28 <artifactId>javax.servlet-api</artifactId>
29 <version>3.0.1</version>
30 </dependency>
31
32 <!-- 日志打印相关的jar -->
33 <dependency>
34 <groupId>org.slf4j</groupId>
35 <artifactId>slf4j-log4j12</artifactId>
36 <version>${slf4j.version}</version>
37 </dependency>
38 <dependency>
39 <groupId>org.slf4j</groupId>
40 <artifactId>slf4j-api</artifactId>
41 <version>${slf4j.version}</version>
42 </dependency>
43
44 <!-- 验证码的生成 -->
45 <dependency>
46 <groupId>com.github.axet</groupId>
47 <artifactId>kaptcha</artifactId>
48 <version>0.0.9</version>
49 </dependency>
50 </dependencies>
51 <build>
52 <finalName>wdh_kaptcha</finalName>
53 <!-- 资源文件的设置 -->
54 <resources>
55 <resource>
56 <directory>src/main/resources</directory>
57 </resource>
58 <resource>
59 <directory>src/main/java</directory>
60 <includes>
61 <include>**/*.properties</include>
62 <include>**/*.xml</include>
63 </includes>
64 <!-- 是否替换资源中的属性 -->
65 <filtering>false</filtering>
66 </resource>
67 </resources>
68 <plugins>
69 <!-- compiler plugin -->
70 <plugin>
71 <groupId>org.apache.maven.plugins</groupId>
72 <artifactId>maven-compiler-plugin</artifactId>
73 <version>2.3.2</version>
74 <configuration>
75 <source>1.7</source>
76 <target>1.7</target>
77 <encoding>UTF-8</encoding>
78 <compilerArguments>
79 <bootclasspath>${java.home}/lib/rt.jar</bootclasspath>
80 </compilerArguments>
81 </configuration>
82 </plugin>
83 <plugin>
84 <groupId>org.eclipse.jetty</groupId>
85 <artifactId>jetty-maven-plugin</artifactId>
86 <version>9.2.1.v20140609</version>
87 </plugin>
88 </plugins>
89 </build>
90 </project>
3、启动WEB容器要在web.xml中配置前端控制器（DispatcherServlet）
1 <?xml version="1.0" encoding="UTF-8"?>
2 <web-app id="WebApp_ID" version="3.0"
3 xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
5 <servlet>
6 <servlet-name>appServlet</servlet-name>
7 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
8 <init-param>
9 <param-name>contextConfigLocation</param-name>
10 <param-value>classpath:*.xml</param-value>
11 </init-param>
12 <!-- 表示启动容器时初始化该Servlet -->
13 <load-on-startup>1</load-on-startup>
14
15 </servlet>
16
17 <servlet-mapping>
18 <servlet-name>appServlet</servlet-name>
19 <!-- 这是拦截请求, /代表拦截所有请求, 也可以是.html或者.action这类的 -->
20 <url-pattern>/</url-pattern>
21 </servlet-mapping>
22
23 <filter>
24 <filter-name>CharacterEncodingFilter</filter-name>
25 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
26 <init-param>
27 <param-name>encoding</param-name>
28 <param-value>UTF-8</param-value>
29 </init-param>
30 </filter>
31 <filter-mapping>
32 <filter-name>CharacterEncodingFilter</filter-name>
33 <url-pattern>/*</url-pattern>
34 </filter-mapping>
35 </web-app>
4、src/main/resources中配置相关信息
a、log4j.properties
1 log4j.rootLogger=DEBUG, Console
2
3 #Console
4 log4j.appender.Console=org.apache.log4j.ConsoleAppender
5 log4j.appender.Console.layout=org.apache.log4j.PatternLayout
6 log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n
7
8 log4j.logger.java.sql.ResultSet=INFO
9 log4j.logger.org.apache=INFO
10 log4j.logger.java.sql.Connection=DEBUG
11 log4j.logger.java.sql.Statement=DEBUG
12 log4j.logger.java.sql.PreparedStatement=DEBUG
b、servlet-context.xml
1 <?xml version="1.0" encoding="UTF-8"?>
2 <beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xmlns:context="http://www.springframework.org/schema/context"
5 xmlns:p="http://www.springframework.org/schema/p"
6 xsi:schemaLocation="
7 http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
8 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
9
10 <!-- 扫描package方便注解依赖注入-->
11 <context:component-scan base-package="com.wisezone" />
12
13 <!--图片验证码配置 -->
14 <bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">
15 <property name="config">
16 <bean class="com.google.code.kaptcha.util.Config">
17 <constructor-arg>
18 <props>
19 <prop key="kaptcha.border">yes</prop><!--是否有边框 -->
20 <prop key="kaptcha.border.color">105,179,90</prop><!--设置边框颜色 -->
21 <prop key="kaptcha.textproducer.font.color">green</prop><!--验证码文本字符颜色 默认为Color.BLACK -->
22 <prop key="kaptcha.session.key">code</prop><!--验证码 -->
23 <prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop><!--设置字体样式 -->
24 <prop key="kaptcha.border.thickness"></prop><!--边框粗细度 默认为1 -->
25 <prop key="kaptcha.producer.impl"></prop><!--验证码生成器 默认为DefaultKaptcha -->
26 <prop key="kaptcha.textproducer.impl"></prop><!-- 验证码文本生成器 默认为DefaultTextCreator -->
27 <prop key="kaptcha.textproducer.char.string"></prop><!--验证码文本字符内容范围 默认为abcde2345678gfynmnpwx -->
28 <prop key="kaptcha.textproducer.char.length">4</prop><!-- 验证码文本字符长度 默认为5 -->
29 <prop key="kaptcha.textproducer.font.size">50</prop><!--验证码文本字符大小 默认为40 -->
30 <prop key="kaptcha.textproducer.char.space">6</prop> <!--验证码文本字符间距 默认为2 -->
31 <prop key="kaptcha.image.width">200</prop> <!--验证码图片宽度 默认为200 -->
32 <prop key="kaptcha.image.height">60</prop> <!--验证码图片高度 默认为40 -->
33 </props>
34 </constructor-arg>
35 </bean>
36 </property>
37 </bean>
38
39
40 </beans>
5、Demo演示
KaptchaController.java
1 package com.wisezone.kaptcha;
2
3 import java.awt.image.BufferedImage;
4
5 import javax.imageio.ImageIO;
6 import javax.servlet.ServletOutputStream;
7 import javax.servlet.http.HttpServletRequest;
8 import javax.servlet.http.HttpServletResponse;
9
10 import org.springframework.beans.factory.annotation.Autowired;
11 import org.springframework.stereotype.Controller;
12 import org.springframework.web.bind.annotation.RequestMapping;
13
14 import com.google.code.kaptcha.Constants;
15 import com.google.code.kaptcha.Producer;
16
17
18 @Controller
19 @RequestMapping("kaptcha")
20 public class KaptchaController {
21
22 @Autowired
23 private Producer captchaProducer;
24
25 @RequestMapping("getKaptchaImage")
26 public void getKaptchaImage(HttpServletRequest request,
27 HttpServletResponse response) throws Exception {
28
29 response.setDateHeader("Expires", 0);
30
31 // Set standard HTTP/1.1 no-cache headers.
32 response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
33 // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
34 response.addHeader("Cache-Control", "post-check=0, pre-check=0");
35 // Set standard HTTP/1.0 no-cache header.
36 response.setHeader("Pragma", "no-cache");
37 // return a jpeg
38 response.setContentType("image/jpeg");
39 // create the text for the image
40 String capText = captchaProducer.createText();
41 // store the text in the session
42 request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
43 // create the image with the text
44 BufferedImage bi = captchaProducer.createImage(capText);
45 ServletOutputStream out = response.getOutputStream();
46 // write the data out
47 ImageIO.write(bi, "jpg", out);
48 try {
49 out.flush();
50 } finally {
51 out.close();
52 }
53 }
54 }
6、启动容器查看结果：
浏览器：http://localhost:8080/kaptcha/getKaptchaImage
