<?xml version="1.0" encoding="utf-8" ?>    <web-app> <display-name>Archetype Created Web Application</display-name>  <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:Work3.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>

时间: 2023-10-29 09:06:55 浏览: 182

这是一个 Java 的 web.xml 配置文件，用于配置一个 web 应用程序。其中包含了 Servlet 配置和映射信息，也包含了 Spring MVC 的配置信息。具体来说： - `<servlet>` 标签定义了一个 Servlet，其名称为 `dispatcherServlet`，使用的类是 `org.springframework.web.servlet.DispatcherServlet`。初始化参数 `contextConfigLocation` 指定了 Spring MVC 的配置文件为 `classpath:Work3.xml`。 - `<servlet-mapping>` 标签定义了将 `/` URL 映射到 `dispatcherServlet` Servlet 上，也就是说所有的请求都将通过 `dispatcherServlet` 进行处理。该配置文件的作用是将所有的请求交由 Spring MVC 的 DispatcherServlet 进行处理，并且使用的 Spring MVC 配置文件为 `Work3.xml`。

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Warehouse Management</title> </head> <body> <h1>Warehouse Management</h1> <p>Scan the barcode to get the warehouse number:</p> <input type="text" id="barcode"> <button onclick="getWarehouseNo()">Get Warehouse Number</button> <p id="warehouseNo"></p> <br> <hr> <p>Add warehouse number manually:</p> <input type="text" id="manualBarcode"> <input type="text" id="manualWarehouseNo"> <button onclick="addWarehouse()">Add Warehouse</button> <br> <hr> <p>View all warehouses:</p> <ul id="warehouseList"></ul> </body> <script src="warehouse.js"></script> </html>function getWarehouseNo() { let barcode = document.getElementById("barcode").value; let xhr = new XMLHttpRequest(); xhr.open("GET", "/api/warehouse/" + barcode, true); xhr.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { document.getElementById("warehouseNo").innerHTML = "Warehouse Number: " + this.responseText; } }; xhr.send();}function addWarehouse() { let barcode = document.getElementById("manualBarcode").value; let warehouseNo = document.getElementById("manualWarehouseNo").value; let xhr = new XMLHttpRequest(); xhr.open("POST", "/api/warehouse/" + barcode + "/" + warehouseNo, true); xhr.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { alert("Warehouse added successfully"); } }; xhr.send();}function getAllWarehouse() { let xhr = new XMLHttpRequest(); xhr.open("GET", "/api/warehouse", true); xhr.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { let data = JSON.parse(this.responseText); let warehouseList = document.getElementById("warehouseList"); for (let warehouse in data) { let list = document.createElement("li"); list.innerHTML = warehouse + ": " + data[warehouse].join(", "); warehouseList.appendChild(list); } } }; xhr.send();}getAllWarehouse();根据这些前端代码写出对应的后端java代码按三层架构来写以及启动类

以下是对应的后端Java代码，按照三层架构来实现： 1. DAO层代码 WarehouseDao.java ``` package com.example.warehousemanagement.dao; import java.util.HashMap; import java.util.Map; public class WarehouseDao { private static Map<String, String[]> warehouseMap = new HashMap<>(); public String[] getWarehouseByBarcode(String barcode) { return warehouseMap.get(barcode); } public void addWarehouse(String barcode, String warehouseNo) { String[] warehouseNumbers = warehouseMap.getOrDefault(barcode, new String[0]); String[] newWarehouseNumbers = new String[warehouseNumbers.length + 1]; System.arraycopy(warehouseNumbers, 0, newWarehouseNumbers, 0, warehouseNumbers.length); newWarehouseNumbers[newWarehouseNumbers.length - 1] = warehouseNo; warehouseMap.put(barcode, newWarehouseNumbers); } public Map<String, String[]> getAllWarehouses() { return warehouseMap; } } ``` 2. Service层代码 WarehouseService.java ``` package com.example.warehousemanagement.service; import com.example.warehousemanagement.dao.WarehouseDao; import java.util.Map; public class WarehouseService { private WarehouseDao warehouseDao; public WarehouseService() { warehouseDao = new WarehouseDao(); } public String[] getWarehouseByBarcode(String barcode) { return warehouseDao.getWarehouseByBarcode(barcode); } public void addWarehouse(String barcode, String warehouseNo) { warehouseDao.addWarehouse(barcode, warehouseNo); } public Map<String, String[]> getAllWarehouses() { return warehouseDao.getAllWarehouses(); } } ``` 3. Controller层代码 WarehouseController.java ``` package com.example.warehousemanagement.controller; import com.example.warehousemanagement.service.WarehouseService; import javax.ws.rs.*; import javax.ws.rs.core.MediaType; import javax.ws.rs.core.Response; import java.util.Map; @Path("warehouse") public class WarehouseController { private WarehouseService warehouseService; public WarehouseController() { warehouseService = new WarehouseService(); } @GET @Path("{barcode}") @Produces(MediaType.TEXT_PLAIN) public Response getWarehouseByBarcode(@PathParam("barcode") String barcode) { String[] warehouseNumbers = warehouseService.getWarehouseByBarcode(barcode); if (warehouseNumbers == null) { return Response.status(Response.Status.NOT_FOUND).entity("Warehouse not found").build(); } else { return Response.ok(warehouseNumbers[0]).build(); } } @POST @Path("{barcode}/{warehouseNo}") public Response addWarehouse(@PathParam("barcode") String barcode, @PathParam("warehouseNo") String warehouseNo) { warehouseService.addWarehouse(barcode, warehouseNo); return Response.ok().build(); } @GET @Produces(MediaType.APPLICATION_JSON) public Response getAllWarehouses() { Map<String, String[]> warehouseMap = warehouseService.getAllWarehouses(); return Response.ok(warehouseMap).build(); } } ``` 4. 启动类代码 WarehouseManagementApplication.java ``` package com.example.warehousemanagement; import org.glassfish.jersey.server.ResourceConfig; import org.glassfish.jersey.servlet.ServletContainer; import org.glassfish.jersey.servlet.ServletProperties; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; @WebServlet(name = "WarehouseManagementApplication", urlPatterns = {"/api/*"}) public class WarehouseManagementApplication extends HttpServlet { @Override public void init() throws ServletException { ResourceConfig config = new ResourceConfig(); config.packages("com.example.warehousemanagement.controller"); ServletContainer container = new ServletContainer(config); this.getServletContext().setAttribute(ServletProperties.JAXRS_APPLICATION_CONTEXT_ATTRIBUTE, config); } } ``` 5. web.xml代码 ``` <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <servlet> <servlet-name>WarehouseManagementApplication</servlet-name> <servlet-class>com.example.warehousemanagement.WarehouseManagementApplication</servlet-class> </servlet> <servlet-mapping> <servlet-name>WarehouseManagementApplication</servlet-name> <url-pattern>/api/*</url-pattern> </servlet-mapping> </web-app> ``` 6. warehouse.js代码 (无需修改) ``` function getWarehouseNo() { let barcode = document.getElementById("barcode").value; let xhr = new XMLHttpRequest(); xhr.open("GET", "/api/warehouse/" + barcode, true); xhr.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { document.getElementById("warehouseNo").innerHTML = "Warehouse Number: " + this.responseText; } }; xhr.send(); } function addWarehouse() { let barcode = document.getElementById("manualBarcode").value; let warehouseNo = document.getElementById("manualWarehouseNo").value; let xhr = new XMLHttpRequest(); xhr.open("POST", "/api/warehouse/" + barcode + "/" + warehouseNo, true); xhr.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { alert("Warehouse added successfully"); } }; xhr.send(); } function getAllWarehouse() { let xhr = new XMLHttpRequest(); xhr.open("GET", "/api/warehouse", true); xhr.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { let data = JSON.parse(this.responseText); let warehouseList = document.getElementById("warehouseList"); for (let warehouse in data) { let list = document.createElement("li"); list.innerHTML = warehouse + ": " + data[warehouse].join(", "); warehouseList.appendChild(list); } } }; xhr.send(); } getAllWarehouse(); ``` 注意事项： 1. 需要在pom.xml中添加Jersey依赖 2. 需要在web.xml中添加Jersey Servlet的配置 3. 需要启动Tomcat等Servlet容器来运行这个项目

web.xml无法声明元素 web-app

如果您无法在 web.xml 文件中声明元素 web-app，那么可能是以下原因之一： 1. 缺少 XML 头信息：web.xml 文件必须包含 XML 头信息，指定 XML 版本和字符编码。例如： ``` <?xml version="1.0" encoding="UTF-8"?> ``` 2. 未指定正确的 DTD：web.xml 文件必须指定正确的 DTD（Document Type Definition），以便验证 XML 的有效性。例如： ``` <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"> ``` 3. 文件名错误：请确保您的 web.xml 文件名正确，并且位于 WEB-INF 目录下。如果您已经检查了上述问题，仍然无法声明元素 web-app，请提供更具体的错误信息或上下文，以便更好地帮助您解决问题。

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web.xml无法声明元素 web-app

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