Spring MVC模式樣本（採用解耦控制器+校正器），mvc

Spring MVC模式樣本（採用解耦控制器+校正器），mvc

Product

package com.mstf.bean;import java.io.Serializable;/** * Product類，封裝了一些資訊，包含三個屬性 * @author wangzheng * */public class Product implements Serializable {private static final long serialVersionUID = 1L;private String name;private String description;private float price;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getDescription() {return description;}public void setDescription(String description) {this.description = description;}public float getPrice() {return price;}public void setPrice(float price) {this.price = price;}}

　　ProductForm

package com.mstf.bean.form;/** * ProductForm是表單類 * 作用：當資料校正失敗時，用於儲存和展示使用者在原始表單的輸入 * @author wangzheng * */public class ProductForm {private String name;private String description;private String price;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getDescription() {return description;}public void setDescription(String description) {this.description = description;}public String getPrice() {return price;}public void setPrice(String price) {this.price = price;}}

　　Controller

package com.mstf.controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public interface Controller {String handleRequest(HttpServletRequest req,HttpServletResponse resp);}

　　InputProductController

package com.mstf.controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class InputProductController implements Controller {@Overridepublic String handleRequest(HttpServletRequest req,HttpServletResponse resp) {return "/WEB-INF/jsp/ProductForm.jsp";}}

　　SaveProductController

package com.mstf.controller;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.mstf.bean.Product;import com.mstf.bean.form.ProductForm;import com.mstf.validator.ProductValidator;public class SaveProductController implements Controller {@Overridepublic String handleRequest(HttpServletRequest req,HttpServletResponse resp) {// 構建一個ProductForm表單對象         ProductForm productForm = new ProductForm();        // 寫入表單對象        productForm.setName(req.getParameter("name"));        productForm.setDescription(req.getParameter("description"));        productForm.setPrice(req.getParameter("price"));                //引入校正器        ProductValidator productValidator=new ProductValidator();        List<String> errors=productValidator.validate(productForm);        if(errors.isEmpty()) {        // 建立模型        Product product = new Product();            product.setName(productForm.getName());            product.setDescription(productForm.getDescription());            product.setPrice(Float.parseFloat(productForm.getPrice()));            req.setAttribute("product", product);            return "/WEB-INF/jsp/ProductDetails.jsp";        } else {        req.setAttribute("errors", errors);        req.setAttribute("form", productForm);        return "/WEB-INF/jsp/ProductForm.jsp";        } }}

　　DispatcherServlet

package com.mstf.servlet;import java.io.IOException;import javax.servlet.RequestDispatcher;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.mstf.controller.InputProductController;import com.mstf.controller.SaveProductController;public class DispatcherServlet extends HttpServlet {private static final long serialVersionUID = 1L;@Overridepublic void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {process(req, resp);}@Overridepublic void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {process(req, resp);}/** * 這個方法用來處理所有輸入請求 * @param req * @param resp * @throws IOException * @throws ServletException */private void process(HttpServletRequest req,HttpServletResponse resp) throws IOException,ServletException {req.setCharacterEncoding("UTF-8"); //轉碼resp.setCharacterEncoding("UTF-8");String uri=req.getRequestURI(); // 擷取請求URIint lastIndex=uri.lastIndexOf("/");String action=uri.substring(lastIndex+1); // 擷取action名稱String dispatchUrl=null;// 執行方法if(action.equals("product_input.action")) {InputProductController controller=new InputProductController();dispatchUrl=controller.handleRequest(req, resp);} else if (action.equals("product_save.action")) {SaveProductController controller=new SaveProductController();dispatchUrl=controller.handleRequest(req, resp);}if(dispatchUrl!=null) {RequestDispatcher rd=req.getRequestDispatcher(dispatchUrl);rd.forward(req, resp);}}}

　ProductValidator

package com.mstf.validator;import java.util.ArrayList;import java.util.List;import com.mstf.bean.form.ProductForm;/** * 校正器 * @author wangzheng * */public class ProductValidator {public List<String> validate(ProductForm productForm) {List<String> errors = new ArrayList<String>();String name = productForm.getName();if (name == null || name.trim().isEmpty()) {errors.add("必須輸入名稱！");}String price = productForm.getPrice();if (price == null || price.trim().isEmpty()) {errors.add("必須輸入價格！");} else {try {Float.parseFloat(price);} catch (NumberFormatException e) {errors.add("輸入的價格無效！");}}return errors;}}

　　ProductDetails.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>詳情</title><style type="text/css">@IMPORT url("css/main.css");</style></head><body><div id="global">    <h4>產品已儲存</h4>    <p>        <h5>詳細列表:</h5>        名稱: ${product.name}<br>        簡介: ${product.description}<br>        價格: ￥${product.price}    </p></div></body></html>

　　ProductForm.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>添加</title><style type="text/css">@IMPORT url("css/main.css");</style></head><body><div id="global"><c:if test="${requestScope.errors != null }"><p id="errors">操作出錯！<ul><c:forEach var="error" items="${requestScope.errors }"><li>${error }</li></c:forEach></ul></p></c:if><form action="product_save.action" method="post"><fieldset><legend>添加：</legend><p>    <label for="name">名稱: </label><input type="text" id="name" name="name" tabindex="1">            </p>            <p>    <label for="description">簡介: </label><input type="text" id="description" name="description" tabindex="2"></p>            <p>    <label for="price">價格: </label><input type="text" id="price" name="price" tabindex="3"></p><p id="buttons"><input id="reset" type="reset" tabindex="4"><input id="submit" type="submit" tabindex="5" value="添加"></p></fieldset></form></div></body></html>