spring mvc —— servlet 控制器 1

港控/mmm° 2022-06-02 04:40 205阅读 0赞

**Servlet3.0中Servlet的使用**

**目录**

1.注解配置

2.异步调用

3.文件上传

相对于之前的版本，Servlet3.0中的Servlet有以下改进：

l  支持注解配置。

l  支持异步调用。

l  直接有对文件上传的支持。

controller

@WebServlet(name = "ControllerServlet", urlPatterns = {
    
            "/input-product", "/save-product" })
    public class ControllerServlet extends HttpServlet {
    
    
        private static final long serialVersionUID = 1579L;
    
    
        @Override
        public void doGet(HttpServletRequest request,
                HttpServletResponse response)
                throws IOException, ServletException {
            process(request, response);
        }
    
    
        @Override
        public void doPost(HttpServletRequest request,
                HttpServletResponse response)
                throws IOException, ServletException {
            process(request, response);
        }
    
    
        private void process(HttpServletRequest request,
                HttpServletResponse response)
                throws IOException, ServletException {
    
    
            String uri = request.getRequestURI();
            /*
             * uri is in this form: /contextName/resourceName,
             * for example: /appdesign1/input-product.
             * However, in the event of a default context, the
             * context name is empty, and uri has this form
             * /resourceName, e.g.: /input-product
             */
            int lastIndex = uri.lastIndexOf("/");
            String action = uri.substring(lastIndex + 1);
            // execute an action
            String dispatchUrl = null;
            if ("input-product".equals(action)) {
                // no action class, just forward
                dispatchUrl = "/jsp/ProductForm.jsp";
            } else if ("save-product".equals(action)) {
                // create form
                ProductForm productForm = new ProductForm();
                // populate action properties
                productForm.setName(request.getParameter("name"));
                productForm.setDescription(
                        request.getParameter("description"));
                productForm.setPrice(request.getParameter("price"));
    
    
                // create model
                Product product = new Product();
                product.setName(productForm.getName());
                product.setDescription(productForm.getDescription());
                try {
                product.setPrice(new BigDecimal(productForm.getPrice()));
                } catch (NumberFormatException e) {
                }
                // execute action method
                SaveProductAction saveProductAction =
                new SaveProductAction();
                saveProductAction.save(product);
    
    
                // store model in a scope variable for the view
                request.setAttribute("product", product);
                dispatchUrl = "/jsp/ProductDetails.jsp";
            }
    
    
            if (dispatchUrl != null) {
                RequestDispatcher rd =
                        request.getRequestDispatcher(dispatchUrl);
                rd.forward(request, response);
            }
        }
    
    }

pom

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    	<groupId>appdesign2</groupId>
    	<artifactId>appdesign2</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>war</packaging>
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.apache.maven.plugins</groupId>
    				<artifactId>maven-war-plugin</artifactId>
    				<version>2.6</version>
    				<configuration>
    					<failOnMissingWebXml>false</failOnMissingWebXml>
    				</configuration>
    			</plugin>
    		</plugins>
    	</build>
    	<dependencies>
    		<dependency>
    			<groupId>javax.servlet</groupId>
    			<artifactId>javax.servlet-api</artifactId>
    			<version>3.1.0</version>
    			<scope>provided</scope>
    		</dependency>
    	</dependencies>
    	<properties>
    		<maven.compiler.source>1.8</maven.compiler.source>
    	</properties>
    </project>

具体介绍 ： http://elim.iteye.com/blog/2013691

参考书籍 ：Spring MVC学习指南（第2版）

源码 ： [https://github.com/kaifengxu/spring-mvc-xuexizhinan/tree/master/chapter-02/sts/appdesign1][https_github.com_kaifengxu_spring-mvc-xuexizhinan_tree_master_chapter-02_sts_appdesign1]

[https_github.com_kaifengxu_spring-mvc-xuexizhinan_tree_master_chapter-02_sts_appdesign1]: https://github.com/kaifengxu/spring-mvc-xuexizhinan/tree/master/chapter-02/sts/appdesign1