整合Servlet三大组件

一、创建Spring Boot项目 - IntegrateThreeComponents01

二、整合Servlet组件

1、编写自定义MyServlet类

2、编写Servlet配置类

3、启动应用，访问http://localhost:8080/hello 测试效果

三、功能扩展 - 返回6位数字字母验证码

1、创建自定义Servlet类 - CodeServlet

package com.hy.lesson12.servlet;import org.springframework.stereotype.Component;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Random;@Component
public class CodeServlet extends HttpServlet {@Overridepublic void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {
//        resp.setCharacterEncoding("UTF-8");// 解决中文乱码
//        resp.setContentType("text/html;charset=utf8");resp.setDateHeader("Expires", -1);// 浏览器不缓存resp.getWriter().println(randomCode(6));}@Overridepublic void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {doGet(req, resp);}/*** 产生指定位数随机码** @param len* @return*/public String randomCode(int len) {char[] codes = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I','J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T','U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4','5', '6', '7', '8', '9'};StringBuffer buffer = new StringBuffer();for (int i = 0; i < len; i++) {int index = new Random().nextInt(35);buffer.append(codes[index]);}return buffer.toString();}
}

2、在Servlet配置类里注册CodeServlet

3、启动应用，访问http://localhost:8080/hello 测试效果

刷新一下

四、整合Filter组件

1、编写自定义Filter类

package com.hy.lesson12.filter;import org.springframework.stereotype.Component;import javax.servlet.*;
import java.io.IOException;@Component
public class MyFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,FilterChain filterChain) throws IOException, ServletException {//过滤器可以对request请求处理之前进行一些预处理servletRequest.setAttribute("hello", "过滤器向你问候：牛年大吉！");//也可以在request请求处理之后进行一些处理servletResponse.setCharacterEncoding("UTF-8");//解决中文乱码servletResponse.setContentType("text/html;charset=utf8");filterChain.doFilter(servletRequest, servletResponse); // 不要忘记了此句，否则程序正常请求流程就不走了}@Overridepublic void destroy() {}
}

2、编写过滤器配置类FileterConfig

package com.hy.lesson12.config;import com.hy.lesson12.filter.MyFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import java.util.Arrays;@Configuration
public class FilterConfig {@Beanpublic FilterRegistrationBean getFilter(MyFilter myFilter){FilterRegistrationBean filterRegistrationBean= new FilterRegistrationBean<>(myFilter);filterRegistrationBean.setUrlPatterns(Arrays.asList("/hello", "/code")); // 定义要过滤的路径return  filterRegistrationBean;}
}

3、修改MyServlet

4、修改CodeServlet

5、访问http://localhost:8080/hello 测试效果

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