Spring4 In Action-7.1.2-自定义DispatcherServlet配置、添加其他的Servlet和Filter

AbstractAnnotationConfigDispatcherServletInitializer的实现类，加载Web的基本配置

代码下载：http://download.csdn.net/download/poiuy1991719/10128895

编写SpitterWebInitializer类：

package spittr.config;

import javax.servlet.MultipartConfigElement;
import javax.servlet.ServletRegistration.Dynamic;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class SpitterWebInitializer extends
        AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class<?>[] { RootConfig.class };
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class<?>[] { WebConfig.class };
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }

    @Override
    protected void customizeRegistration(Dynamic registration) {// 对DispatcherServlet进行额外配置
        registration.setMultipartConfig(new MultipartConfigElement(
                "/tmp/spittr/uploads", 2097152, 4194304, 0));
    }

}

编写Web配置类：

package spittr.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
/***
 * 配置web
 */
@Configuration //配置类，需要的注解
@EnableWebMvc  //启用Spring MVC
@ComponentScan("spittr.web")  //启用组件扫描，就会扫描到控制器
public class WebConfig extends WebMvcConfigurerAdapter {

    @Bean
    public ViewResolver viewResolver() {//配置JSP视图解析器
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");//在请求路径前，加入资源路径
        resolver.setSuffix(".jsp");//在请求路径后，加入资源名称，比如/WEB-INF/views/home.jsp
        resolver.setViewClass(org.springframework.web.servlet.view.JstlView.class);
        return resolver;
    }

    @Override
    public void configureDefaultServletHandling(  //处理静态资源
            DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        super.addResourceHandlers(registry);
    }

}

编写其他组件启动类：

package spittr.config;

import java.util.regex.Pattern;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.context.annotation.Import;
import org.springframework.core.type.filter.RegexPatternTypeFilter;

import spittr.config.RootConfig.WebPackage;

@Configuration
@Import(DataConfig.class)
@ComponentScan(basePackages = { "spittr" }, excludeFilters = { @Filter(type = FilterType.CUSTOM, value = WebPackage.class) })
public class RootConfig {
    public static class WebPackage extends RegexPatternTypeFilter {
        public WebPackage() {
            super(Pattern.compile("spittr\.web"));
        }
    }
}

package spittr.config;

import javax.sql.DataSource;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcOperations;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

@Configuration
public class DataConfig {

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql:///spittle");
        dataSource.setUsername("root");
        dataSource.setPassword("root");

        return dataSource;
    }

    @Bean
    public JdbcOperations jdbcTemplate(DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

}

基本工作完成，下面就开始进入正题：

一、添加另外的自定义Servlet：WebApplicationInitializer类的实现：仅仅完成基本的输出

package com.regist.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyServlet extends HttpServlet {

    public MyServlet() {
        super();
    }

    public void destroy() {
        super.destroy();
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        out.print("    This is ");
        out.print(this.getClass());
        out.println(", using the GET method");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        out.print("    This is ");
        out.print(this.getClass());
        out.println(", using the POST method");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

    public void init() throws ServletException {
    }

}

package com.regist.servlet.config;

import javax.servlet.ServletRegistration.Dynamic;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import org.springframework.web.WebApplicationInitializer;

import com.regist.servlet.MyServlet;

/***
 * 往容器中，注册其他的组件，只需实现WebApplicationInitializer接口即可
 * 本方法，注册了一个Servlet
 */
public class MyServletInitializer implements WebApplicationInitializer{

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        System.out.println("-------------------------------------");
        Dynamic myServlet = servletContext.addServlet("myServlet", MyServlet.class);//注册Servlet    
        myServlet.addMapping("/myServlet/*");//映射路径
    }

}

二、添加Filter拦截器：WebApplicationInitializer类的实现：

package com.regist.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

public class MyFilter implements Filter {

    // 来访数量
    private int count;

    @Override
    public void destroy() {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        System.out.println("------------过滤器执行");
        chain.doFilter(request, response); // 向下传递过滤器
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

}

package com.regist.filter.config;

import javax.servlet.FilterRegistration.Dynamic;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import org.springframework.web.WebApplicationInitializer;

import com.regist.filter.MyFilter;

public class MyFilterInitializer implements WebApplicationInitializer{

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        System.out.println("-----------------class:MyFilterInitializer-------------------");
        Dynamic filter = servletContext.addFilter("myFilter", MyFilter.class);
        filter.addMappingForUrlPatterns(null, false, "/myServlet/*");//映射路径
    }

}