public Result<CollectInfo> add(@RequestBody CollectInfoVo collectInfo, HttpServletRequest request) { collectInfoService.add(collectInfo, request); return Result.success(collectInfo); }

这是一个使用Spring框架编写的Java后端接口，接收一个CollectInfoVo类型的请求体和HttpServletRequest对象，返回一个Result类型的响应体。在方法体内，调用了collectInfoService的add方法，将请求体和HttpServletRequest对象作为参数传入。最后返回一个包含响应数据的成功的Result类型的响应体。

相关问题

dao包有ProductDao，UserDao，service有ProductService，UserService，servlet有BaseServlet，filter有BaseFilter（除了load.jsp请求和load.action请求，其他请求资源访问必须先登录），页面中包括一个搜索栏和一个表格。搜索栏包括商品Id（精确查询）和商品名称（模糊查询）两个输入框，以及一个搜索商品按钮。表格中包括全选/全不选的复选框、商品id、商品类别、类别名称和操作（删除），以及最下方的批量删除按钮。 在数据库中，有一个product表，包括pid、pname、pimage、shop_price四个字段，以及一个category表，包括cid和cname两个字段。在页面中，勾选复选框后，下方会显示商品Id、商品图片和商品价格。完善代码

好的，以下是一个基于您提供的要求和框架的代码示例。请注意，这只是一个示例，具体实现细节可能与您的要求有所不同，需要您根据实际情况进行调整。

ProductDao.java

public class ProductDao {
    
    // 获取数据库连接
    private Connection getConnection() {
        // TODO: 实现获取数据库连接的方法
    }
    
    // 根据 id 查询商品
    public Product getProductById(int pid) {
        Connection conn = getConnection();
        String sql = "SELECT * FROM product WHERE pid = ?";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, pid);
        ResultSet rs = pstmt.executeQuery();
        if (rs.next()) {
            Product product = new Product();
            product.setPid(rs.getInt("pid"));
            product.setPname(rs.getString("pname"));
            product.setPimage(rs.getString("pimage"));
            product.setShopPrice(rs.getDouble("shop_price"));
            return product;
        } else {
            return null;
        }
    }
    
    // 根据名称模糊查询商品
    public List<Product> getProductsByName(String name) {
        Connection conn = getConnection();
        String sql = "SELECT * FROM product WHERE pname LIKE ?";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, "%" + name + "%");
        ResultSet rs = pstmt.executeQuery();
        List<Product> products = new ArrayList<>();
        while (rs.next()) {
            Product product = new Product();
            product.setPid(rs.getInt("pid"));
            product.setPname(rs.getString("pname"));
            product.setPimage(rs.getString("pimage"));
            product.setShopPrice(rs.getDouble("shop_price"));
            products.add(product);
        }
        return products;
    }
    
    // 根据 id 删除商品
    public boolean deleteProductById(int pid) {
        Connection conn = getConnection();
        String sql = "DELETE FROM product WHERE pid = ?";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setInt(1, pid);
        int result = pstmt.executeUpdate();
        return result > 0;
    }
    
    // 批量删除商品
    public boolean deleteProducts(List<Integer> pids) {
        Connection conn = getConnection();
        String sql = "DELETE FROM product WHERE pid IN (";
        for (int i = 0; i < pids.size(); i++) {
            sql += "?";
            if (i != pids.size() - 1) {
                sql += ",";
            }
        }
        sql += ")";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        for (int i = 0; i < pids.size(); i++) {
            pstmt.setInt(i + 1, pids.get(i));
        }
        int result = pstmt.executeUpdate();
        return result > 0;
    }
    
}

UserService.java

public class UserService {
    
    private UserDao userDao = new UserDao();
    
    // 用户登录
    public boolean login(String username, String password) {
        User user = userDao.getUserByUsername(username);
        if (user != null && user.getPassword().equals(password)) {
            return true;
        } else {
            return false;
        }
    }
    
}

BaseServlet.java

public abstract class BaseServlet extends HttpServlet {
    
    // 获取 ProductService 和 UserService 实例
    protected ProductService productService = new ProductService();
    protected UserService userService = new UserService();
    
    // 处理 GET 请求
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO: 实现 GET 请求处理逻辑
    }
    
    // 处理 POST 请求
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO: 实现 POST 请求处理逻辑
    }
    
}

BaseFilter.java

public class BaseFilter implements Filter {
    
    // 过滤器初始化
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO: 实现过滤器初始化逻辑
    }
    
    // 过滤器销毁
    public void destroy() {
        // TODO: 实现过滤器销毁逻辑
    }
    
    // 过滤请求
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;
        HttpSession session = req.getSession();
        if (session.getAttribute("user") == null) {
            resp.sendRedirect(req.getContextPath() + "/login.jsp");
        } else {
            chain.doFilter(request, response);
        }
    }
    
}

ProductServlet.java

public class ProductServlet extends BaseServlet {
    
    private ProductDao productDao = new ProductDao();
    
    // 处理 GET 请求
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String action = request.getParameter("action");
        if ("search".equals(action)) {
            String pidStr = request.getParameter("pid");
            String pname = request.getParameter("pname");
            if (pidStr != null && !pidStr.isEmpty()) {
                int pid = Integer.parseInt(pidStr);
                Product product = productDao.getProductById(pid);
                if (product != null) {
                    request.setAttribute("products", Collections.singletonList(product));
                } else {
                    request.setAttribute("message", "未找到对应商品");
                }
            } else if (pname != null && !pname.isEmpty()) {
                List<Product> products = productDao.getProductsByName(pname);
                if (products.isEmpty()) {
                    request.setAttribute("message", "未找到对应商品");
                } else {
                    request.setAttribute("products", products);
                }
            } else {
                request.setAttribute("message", "请输入查询条件");
            }
            request.getRequestDispatcher("/product_list.jsp").forward(request, response);
        } else if ("delete".equals(action)) {
            String[] pids = request.getParameterValues("pids[]");
            if (pids != null && pids.length > 0) {
                List<Integer> pidList = new ArrayList<>();
                for (String pid : pids) {
                    pidList.add(Integer.parseInt(pid));
                }
                boolean result = productDao.deleteProducts(pidList);
                if (result) {
                    request.setAttribute("message", "删除成功");
                } else {
                    request.setAttribute("message", "删除失败");
                }
            } else {
                request.setAttribute("message", "请选择要删除的商品");
            }
            request.getRequestDispatcher("/product_list.jsp").forward(request, response);
        } else {
            request.setAttribute("message", "非法请求");
            request.getRequestDispatcher("/product_list.jsp").forward(request, response);
        }
    }
    
}

product_list.jsp

<%@ page contentType="text/html;charset=UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>商品列表</title>
    <link rel="stylesheet" href="${pageContext.request.contextPath}/css/style.css">
    <script src="${pageContext.request.contextPath}/js/jquery-3.6.0.min.js"></script>
    <script>
        $(function () {
            // 全选/全不选
            $("#check_all").click(function () {
                $(".check_item").prop("checked", $(this).prop("checked"));
            });
            // 批量删除
            $("#btn_delete").click(function () {
                var pids = [];
                $(".check_item:checked").each(function () {
                    pids.push($(this).val());
                });
                if (pids.length == 0) {
                    alert("请选择要删除的商品");
                    return;
                }
                if (confirm("确定要删除选中的商品吗？")) {
                    $.ajax({
                        url: "${pageContext.request.contextPath}/product?action=delete",
                        type: "POST",
                        data: {pids: pids},
                        success: function (data) {
                            alert(data.message);
                            window.location.reload();
                        },
                        error: function () {
                            alert("请求失败，请稍后再试");
                        }
                    });
                }
            });
        });
    </script>
</head>
<body>
<div class="container">
    <h1>商品列表</h1>
    <div class="search">
        <form action="${pageContext.request.contextPath}/product" method="GET">
            <label>商品ID：</label>
            <input type="text" name="pid">
            <label>商品名称：</label>
            <input type="text" name="pname">
            <button type="submit">搜索商品</button>
        </form>
    </div>
    <div class="message">
        <c:if test="${not empty message}">
            <span>${message}</span>
        </c:if>
    </div>
    <table>
        <thead>
        <tr>
            <th><input type="checkbox" id="check_all"></th>
            <th>商品ID</th>
            <th>商品名称</th>
            <th>商品图片</th>
            <th>商品价格</th>
            <th>操作</th>
        </tr>
        </thead>
        <tbody>
        <c:if test="${not empty products}">
            <c:forEach items="${products}" var="product">
                <tr>
                    <td><input type="checkbox" class="check_item" value="${product.pid}"></td>
                    <td>${product.pid}</td>
                    <td>${product.pname}</td>
                    <td><img src="${product.pimage}"></td>
                    <td>${product.shopPrice}</td>
                    <td><a href="#">删除</a></td>
                </tr>
            </c:forEach>
        </c:if>
        </tbody>
    </table>
    <div class="actions">
        <button id="btn_delete">批量删除</button>
    </div>
</div>
</body>
</html>

以上是一个基于您提供的要求和框架的代码示例。其中，ProductDao 负责与数据库进行交互，UserService 负责处理用户登录相关的业务逻辑，BaseServlet 和 BaseFilter 分别为 servlet 和 filter 的基类，ProductServlet 处理与商品相关的请求，product_list.jsp 为展示商品列表的页面。在 JavaScript 中，使用 jQuery 实现了全选/全不选和批量删除的功能。

1：javaweb实现项目全局编码过滤器功能 2：实现登录过滤器功能 3：在商品列表上增加个“添加”按钮，打开一个页面，里面有表单（某个商品），单击添加功能，将商品信息进行添加后进入到商品展示列表展示添加商品后的页面，实现商品图片的上传功能。（扩充：单击按钮打开利用bootstrap创建的模态框，模态框中有个商品表单，单击添加，商品添加成功后回到商品展示列表中）

1. 要实现全局编码过滤器功能，可以在web.xml文件中添加一个Filter，然后在该Filter中设置request和response的编码格式为UTF-8，以便于支持中文字符。下面是一个示例代码：

<filter>
  <filter-name>CharsetEncodingFilter</filter-name>
  <filter-class>com.example.CharsetEncodingFilter</filter-class>
  <init-param>
    <param-name>encoding</param-name>
    <param-value>UTF-8</param-value>
  </init-param>
</filter>

<filter-mapping>
  <filter-name>CharsetEncodingFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

2. 要实现登录过滤器功能，可以在web.xml文件中添加一个Filter，然后在该Filter中判断用户是否已经登录，如果没有登录，则跳转到登录页面。下面是一个示例代码：

<filter>
  <filter-name>LoginFilter</filter-name>
  <filter-class>com.example.LoginFilter</filter-class>
</filter>

<filter-mapping>
  <filter-name>LoginFilter</filter-name>
  <url-pattern>/admin/*</url-pattern>
</filter-mapping>

3. 要在商品列表上增加一个“添加”按钮，并实现商品图片的上传功能，可以使用HTML、CSS、JavaScript和Java等技术实现。下面是一个示例代码：

<!-- 商品列表页面 -->
<html>
<head>
  <title>商品列表</title>
  <script src="https://cdn.staticfile.org/jquery/3.5.1/jquery.min.js"></script>
  <script>
    // 点击“添加”按钮时，打开模态框
    $(document).on('click', '#add-btn', function() {
      $('#add-modal').modal('show');
    });
    
    // 点击“提交”按钮时，上传商品信息
    $(document).on('click', '#submit-btn', function() {
      var form = new FormData($('#add-form')[0]);
      $.ajax({
        url: 'add-product',
        type: 'POST',
        data: form,
        processData: false,
        contentType: false,
        success: function(result) {
          // 添加成功后，刷新页面
          location.reload();
        },
        error: function() {
          alert('添加商品失败！')
        }
      });
    });
  </script>
</head>
<body>
  <h1>商品列表</h1>
  <table>
    <thead>
      <tr>
        <th>ID</th>
        <th>名称</th>
        <th>价格</th>
        <th>操作</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>1</td>
        <td>商品1</td>
        <td>10元</td>
        <td><button id="add-btn">添加</button></td>
      </tr>
      <tr>
        <td>2</td>
        <td>商品2</td>
        <td>20元</td>
        <td><button id="add-btn">添加</button></td>
      </tr>
      <tr>
        <td>3</td>
        <td>商品3</td>
        <td>30元</td>
        <td><button id="add-btn">添加</button></td>
      </tr>
    </tbody>
  </table>
  
  <!-- 添加商品模态框 -->
  <div class="modal fade" id="add-modal" tabindex="-1" role="dialog" aria-labelledby="add-modal-title" aria-hidden="true">
    <div class="modal-dialog" role="document">
      <div class="modal-content">
        <div class="modal-header">
          <h5 class="modal-title" id="add-modal-title">添加商品</h5>
          <button type="button" class="close" data-dismiss="modal" aria-label="Close">
            <span aria-hidden="true">&times;</span>
          </button>
        </div>
        <div class="modal-body">
          <form id="add-form">
            <div class="form-group">
              <label for="name">名称：</label>
              <input type="text" class="form-control" id="name" name="name" required>
            </div>
            <div class="form-group">
              <label for="price">价格：</label>
              <input type="text" class="form-control" id="price" name="price" required>
            </div>
            <div class="form-group">
              <label for="image">图片：</label>
              <input type="file" class="form-control-file" id="image" name="image" accept="image/*" required>
            </div>
          </form>
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-primary" id="submit-btn">提交</button>
          <button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button>
        </div>
      </div>
    </div>
  </div>
</body>
</html>

在Java中，可以使用Servlet和JSP等技术处理上传的商品信息，并将其保存到数据库中。下面是一个示例代码：

// 添加商品Servlet
@WebServlet("/add-product")
@MultipartConfig
public class AddProductServlet extends HttpServlet {
  private ProductService productService = new ProductService();
  
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String name = request.getParameter("name");
    String price = request.getParameter("price");
    Part imagePart = request.getPart("image");
    InputStream image = imagePart.getInputStream();
    productService.addProduct(name, price, image);
  }
}

// 商品Service
public class ProductService {
  private ProductDao productDao = new ProductDao();
  
  public void addProduct(String name, String price, InputStream image) {
    Product product = new Product();
    product.setName(name);
    product.setPrice(price);
    product.setImage(image);
    productDao.addProduct(product);
  }
}

// 商品Dao
public class ProductDao {
  private Connection getConnection() throws SQLException {
    String url = "jdbc:mysql://localhost:3306/db_name?useUnicode=true&characterEncoding=UTF-8";
    String user = "root";
    String password = "root";
    return DriverManager.getConnection(url, user, password);
  }
  
  public void addProduct(Product product) {
    String sql = "INSERT INTO product (name, price, image) VALUES (?, ?, ?)";
    try (Connection conn = getConnection();
         PreparedStatement stmt = conn.prepareStatement(sql)) {
      stmt.setString(1, product.getName());
      stmt.setString(2, product.getPrice());
      stmt.setBlob(3, product.getImage());
      stmt.executeUpdate();
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }
}

// 商品实体类
public class Product {
  private int id;
  private String name;
  private String price;
  private InputStream image;
  
  // 省略getter和setter方法
}

以上代码只是一个简单的示例，实际开发中还需要进行参数校验、异常处理、日志记录等操作。