diff --git a/src/main/java/com/example/newgroupshell/common/enums/InvoiceTypeEnum.java b/src/main/java/com/example/newgroupshell/common/enums/InvoiceTypeEnum.java
new file mode 100644
index 0000000000000000000000000000000000000000..11422f4cba23282ae8e2f2622ccf2648e2fbf830
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/common/enums/InvoiceTypeEnum.java
@@ -0,0 +1,6 @@
+package com.example.newgroupshell.common.enums;
+
+public enum InvoiceTypeEnum {
+    EXPENSE,
+    INCOME
+}
diff --git a/src/main/java/com/example/newgroupshell/controller/InvoiceCtrl.java b/src/main/java/com/example/newgroupshell/controller/InvoiceCtrl.java
new file mode 100644
index 0000000000000000000000000000000000000000..ff06e1a8ab2dba45b8ee6cf39dd418cda50b020d
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/controller/InvoiceCtrl.java
@@ -0,0 +1,72 @@
+package com.example.newgroupshell.controller;
+
+import com.example.newgroupshell.pojo.Invoice;
+import com.example.newgroupshell.service.InvoiceService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api/invoice")
+public class InvoiceCtrl {
+
+    @Autowired
+    private InvoiceService invoiceService;
+
+    @PostMapping
+    public Invoice addInvoice(@RequestBody Invoice record) {
+        return invoiceService.addInvoice(record);
+    }
+
+    // 根据ID获取发票信息
+    @GetMapping("/{id}")
+    public Invoice getInvoiceById(@PathVariable Integer id) {
+        return invoiceService.getInvoiceById(id);
+    }
+
+    @GetMapping
+    public List<Invoice> getAllInvoices() {
+        return invoiceService.getAllInvoices();
+    }
+
+    @PutMapping("/{id}")
+    public Invoice updateInvoice(@PathVariable Integer id, @RequestBody Invoice record) {
+        record.setId(id);
+        return invoiceService.updateInvoice(record);
+    }
+
+    @DeleteMapping("/{id}")
+    public String deleteInvoice(@PathVariable Integer id) {
+        return invoiceService.deleteInvoice(id);
+    }
+
+    // 获取指定时间段内的总支出
+    @GetMapping("/expenses")
+    public BigDecimal getExpensesByTime(@RequestParam LocalDateTime start, @RequestParam LocalDateTime end) {
+        return invoiceService.getExpensesByTime(start, end);
+    }
+
+    // 获取指定时间段内的总收入
+    @GetMapping("/incomes")
+    public BigDecimal getIncomesByTime(@RequestParam LocalDateTime start, @RequestParam LocalDateTime end) {
+        return invoiceService.getIncomesByTime(start, end);
+    }
+
+    // 获取指定时间段内的净收入
+    @GetMapping("/netIncome")
+    public BigDecimal getNetIncomeByTime(@RequestParam LocalDateTime start, @RequestParam LocalDateTime end) {
+        return invoiceService.getNetIncomeByTime(start, end);
+    }
+
+    // 获取指定类别和时间段内的支出汇总
+    @GetMapping("/expensesByCategory")
+    public Map<String, BigDecimal> getExpensesByCategory(@RequestParam String category,
+                                                         @RequestParam LocalDateTime start,
+                                                         @RequestParam LocalDateTime end) {
+        return invoiceService.getExpensesByCategory(category, start, end);
+    }
+}
diff --git a/src/main/java/com/example/newgroupshell/controller/TaskCtrl.java b/src/main/java/com/example/newgroupshell/controller/TaskCtrl.java
new file mode 100644
index 0000000000000000000000000000000000000000..c05dc6afe6e7ecf09f43a8ec0f095c9cce1a73ca
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/controller/TaskCtrl.java
@@ -0,0 +1,54 @@
+package com.example.newgroupshell.controller;
+
+import com.example.newgroupshell.pojo.Task;
+import com.example.newgroupshell.common.enums.TaskStatusEnum;
+import com.example.newgroupshell.service.TaskService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/task")
+public class TaskCtrl {
+
+    @Autowired
+    private TaskService taskService;
+
+    // 创建任务
+    @PostMapping
+    public Task createTask(@RequestBody Task task) {
+        return taskService.createTask(task);
+    }
+
+    // 更新任务
+    @PutMapping("/{id}")
+    public Task updateTask(@PathVariable Integer id, @RequestBody Task task) {
+        task.setId(id);
+        return taskService.updateTask(task);
+    }
+
+    // 删除任务
+    @DeleteMapping("/{id}")
+    public boolean deleteTask(@PathVariable Integer id) {
+        return taskService.deleteTask(id);
+    }
+
+    // 按创建者ID获取任务列表
+    @GetMapping("/creator/{creatorId}")
+    public List<Task> listTasksByCreator(@PathVariable Integer creatorId) {
+        return taskService.listTasksByCreator(creatorId);
+    }
+
+    // 按受托人ID获取任务列表
+    @GetMapping("/assignee/{assigneeId}")
+    public List<Task> listTasksByAssignee(@PathVariable Integer assigneeId) {
+        return taskService.listTasksByAssignee(assigneeId);
+    }
+
+    // 按状态获取任务列表
+    @GetMapping("/status")
+    public List<Task> listTasksByStatus(@RequestParam TaskStatusEnum status) {
+        return taskService.listTasksByStatus(status);
+    }
+}
diff --git a/src/main/java/com/example/newgroupshell/mapper/InvoiceMapper.java b/src/main/java/com/example/newgroupshell/mapper/InvoiceMapper.java
new file mode 100644
index 0000000000000000000000000000000000000000..f6c1bcf3ebc5178079d188e0e75895b4b34473e4
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/mapper/InvoiceMapper.java
@@ -0,0 +1,34 @@
+package com.example.newgroupshell.mapper;
+
+import com.example.newgroupshell.common.enums.InvoiceTypeEnum;
+import com.example.newgroupshell.pojo.Invoice;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.time.LocalTime;
+import java.util.List;
+
+@Mapper
+public interface InvoiceMapper {
+    Invoice insert(Invoice record);
+
+    Invoice findById(@Param("id") Integer id);
+
+    List<Invoice> findAllInvoice();
+
+    Invoice updateInvoiceById(Invoice record);
+
+    String deleteById(@Param("id") Integer id);
+
+    BigDecimal sumAmountByDate(@Param("type") InvoiceTypeEnum type,
+                               @Param("start") LocalDateTime start,
+                               @Param("end") LocalDateTime end);
+
+    List<Invoice> findByCategoryAndDate(@Param("category") String category,
+                                        @Param("start") LocalDateTime start,
+                                        @Param("end") LocalDateTime end);
+
+
+}
diff --git a/src/main/java/com/example/newgroupshell/mapper/TaskMapper.java b/src/main/java/com/example/newgroupshell/mapper/TaskMapper.java
index 8291fadec2d5705e34f75559536c66a40a03ad85..dac4b4c4c618dbe2cd41373047466e0a5c316c06 100644
--- a/src/main/java/com/example/newgroupshell/mapper/TaskMapper.java
+++ b/src/main/java/com/example/newgroupshell/mapper/TaskMapper.java
@@ -7,17 +7,16 @@ import org.apache.ibatis.annotations.*;
 import java.util.List;
 
 @Mapper
-public interface TaskMapper
-{
-	int insertTask(Task task);
-	
-	int updateTaskById(Task task);
-	
-	int deleteTaskById(@Param("tid") Integer tid);
-	
-	List<Task> findTasksByAssigneeId(@Param("assigneeId") Integer assigneeId);
-	
-	List<Task> findTasksByCreatorId(@Param("creatorId") Integer creatorId);
-	
-	List<Task> findTasksByStatus(@Param("status") TaskStatusEnum status);
+public interface TaskMapper {
+    int insertTask(Task task);
+
+    int updateTaskById(Task task);
+
+    int deleteTaskById(@Param("id") Integer id);
+
+    List<Task> findTasksByAssigneeId(@Param("assigneeId") Integer assigneeId);
+
+    List<Task> findTasksByCreatorId(@Param("creatorId") Integer creatorId);
+
+    List<Task> findTasksByStatus(@Param("status") TaskStatusEnum status);
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/newgroupshell/pojo/Invoice.java b/src/main/java/com/example/newgroupshell/pojo/Invoice.java
new file mode 100644
index 0000000000000000000000000000000000000000..0d1e659fa1c67610cea9b1984947b18abd4f5e39
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/pojo/Invoice.java
@@ -0,0 +1,61 @@
+package com.example.newgroupshell.pojo;
+
+import com.example.newgroupshell.common.enums.InvoiceTypeEnum;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+/**
+ * Invoice class represents an invoice object with its attributes and methods.
+ *
+ * @author Tabnine
+ * @version 1.0
+ */
+@Data
+@ToString
+@NoArgsConstructor
+@AllArgsConstructor
+public class Invoice {
+    /**
+     * The unique identifier for the invoice.
+     * 主键，自增
+     */
+    private Integer id;
+
+    /**
+     * The amount of the invoice.
+     * 使用BigDecimal进行与财务相关的计算，避免出现浮点数运算误差
+     */
+    private BigDecimal amount;
+
+
+    private InvoiceTypeEnum type;
+    /**
+     * 非空
+     */
+
+    /**
+     * The description of the invoice.
+     */
+    private String description;
+
+    /**
+     * The category of the invoice.
+     */
+    private String category;
+
+    /**
+     * The date and time when the invoice was created.
+     */
+    private LocalDateTime createdTime;
+
+    /**
+     * The user ID associated with the invoice.
+     * 外键引用user表的id
+     */
+    private Integer userId;
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/newgroupshell/service/InvoiceService.java b/src/main/java/com/example/newgroupshell/service/InvoiceService.java
new file mode 100644
index 0000000000000000000000000000000000000000..b34511509281b7fb5978e050018f9297c51b8171
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/service/InvoiceService.java
@@ -0,0 +1,31 @@
+package com.example.newgroupshell.service;
+
+import com.example.newgroupshell.pojo.Invoice;
+import org.springframework.stereotype.Service;
+
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Map;
+
+@Service
+public interface InvoiceService {
+
+    public Invoice addInvoice(Invoice record);
+
+    public Invoice getInvoiceById(Integer id);
+
+    public List<Invoice> getAllInvoices();
+
+    public Invoice updateInvoice(Invoice record);
+
+    public String deleteInvoice(Integer id);
+
+    public BigDecimal getExpensesByTime(LocalDateTime start, LocalDateTime end);
+
+    BigDecimal getIncomesByTime(LocalDateTime start, LocalDateTime end);
+
+    BigDecimal getNetIncomeByTime(LocalDateTime start, LocalDateTime end);
+
+    Map<String, BigDecimal> getExpensesByCategory(String category, LocalDateTime start, LocalDateTime end);
+}
diff --git a/src/main/java/com/example/newgroupshell/service/impl/InvoiceServiceImpl.java b/src/main/java/com/example/newgroupshell/service/impl/InvoiceServiceImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..b8d57b28f2ff1ccabda9037edadc0622f69c5424
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/service/impl/InvoiceServiceImpl.java
@@ -0,0 +1,75 @@
+package com.example.newgroupshell.service.impl;
+
+import com.example.newgroupshell.common.enums.InvoiceTypeEnum;
+import com.example.newgroupshell.mapper.InvoiceMapper;
+import com.example.newgroupshell.pojo.Invoice;
+import com.example.newgroupshell.service.InvoiceService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+@Service
+public class InvoiceServiceImpl implements InvoiceService {
+
+    @Autowired
+    private InvoiceMapper invoiceMapper;
+
+    @Override
+    public Invoice addInvoice(Invoice record) {
+        return invoiceMapper.insert(record);
+    }
+
+    //TODO:实现Controller类的函数
+    @Override
+    public Invoice getInvoiceById(Integer id) {
+        return invoiceMapper.findById(id);
+    }
+
+    @Override
+    public List<Invoice> getAllInvoices() {
+        return invoiceMapper.findAllInvoice();
+    }
+
+    @Override
+    public Invoice updateInvoice(Invoice record) {
+        return invoiceMapper.updateInvoiceById(record);
+    }
+
+    @Override
+    public String deleteInvoice(Integer id) {
+        invoiceMapper.deleteById(id);
+        return "Record deleted successfully!";
+    }
+
+    //TODO:实现Controller类的函数
+    @Override
+    public BigDecimal getExpensesByTime(LocalDateTime start, LocalDateTime end) {
+        return invoiceMapper.sumAmountByDate(InvoiceTypeEnum.EXPENSE, start, end);
+    }
+
+    @Override
+    public BigDecimal getIncomesByTime(LocalDateTime start, LocalDateTime end) {
+        return invoiceMapper.sumAmountByDate(InvoiceTypeEnum.INCOME, start, end);
+    }
+
+    @Override
+    public BigDecimal getNetIncomeByTime(LocalDateTime start, LocalDateTime end) {
+        BigDecimal income = invoiceMapper.sumAmountByDate(InvoiceTypeEnum.INCOME, start, end);
+        BigDecimal expenses = invoiceMapper.sumAmountByDate(InvoiceTypeEnum.EXPENSE, start, end);
+        return income.subtract(expenses);
+    }
+
+
+    //从数据库查询特定类别和时间范围内的发票，然后计算每个类别的总金额，并以Map形式返回结果
+    @Override
+    public Map<String, BigDecimal> getExpensesByCategory(String category, LocalDateTime start, LocalDateTime end) {
+        List<Invoice> records = invoiceMapper.findByCategoryAndDate(category, start, end);
+        return records.stream().collect(Collectors.groupingBy(Invoice::getCategory,
+                Collectors.reducing(BigDecimal.ZERO, Invoice::getAmount, BigDecimal::add)));
+    }
+}
diff --git a/src/main/resources/mapper/InvoiceMapper.xml b/src/main/resources/mapper/InvoiceMapper.xml
new file mode 100644
index 0000000000000000000000000000000000000000..0d5d8b38622c8e07d46dbf3a372086037c6cd1f2
--- /dev/null
+++ b/src/main/resources/mapper/InvoiceMapper.xml
@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.example.newgroupshell.mapper.InvoiceMapper">
+
+    <sql id="Base_Column_List">
+        id, amount, type, description, category, created_time, user_id
+    </sql>
+
+    <insert id="insert" parameterType="com.example.newgroupshell.pojo.Invoice">
+        INSERT INTO invoice (<include refid="Base_Column_List"/>)
+        VALUES (#{id}, #{amount},#{type}, #{description}, #{category}, #{created_time}, #{user_id})
+    </insert>
+
+    <select id="findById" resultType="com.example.newgroupshell.pojo.Invoice">
+        SELECT *
+        FROM invoice
+        WHERE id = #{id}
+    </select>
+
+    <select id="findAllInvoice" resultType="com.example.newgroupshell.pojo.Invoice">
+        SELECT *
+        FROM invoice
+#         WHERE user_id = #{userId}
+    </select>
+
+    <update id="updateInvoiceById" parameterType="com.example.newgroupshell.pojo.Invoice">
+        UPDATE invoice
+        <set>
+            <if test="amount != null">
+                amount = #{amount},
+            </if>
+            <if test="type != null">
+                type = #{type},
+            </if>
+            <if test="description != null">
+                description = #{description},
+            </if>
+            <if test="category != null">
+                category = #{category},
+            </if>
+            <if test="created_time != null">
+                created_time = #{createdTime},
+            </if>
+            <if test="user_id != null">
+                user_id = #{userId},
+            </if>
+        </set>
+        WHERE id = #{id}
+    </update>
+
+    <delete id="deleteById">
+        DELETE
+        FROM invoice
+        WHERE id = #{id}
+    </delete>
+
+    <select id="sumAmountByDate" resultType="java.math.BigDecimal">
+        SELECT SUM(amount) AS totalAmount
+        FROM invoice
+        WHERE type = #{type}
+          AND created_time BETWEEN #{start} AND #{end}
+    </select>
+
+    <select id="findByCategoryAndDate" resultType="com.example.newgroupshell.pojo.Invoice">
+        SELECT *
+        FROM invoice
+        WHERE category = #{category}
+          AND created_time BETWEEN #{start} AND #{end}
+    </select>
+
+
+</mapper>
diff --git a/src/main/resources/mapper/TaskMapper.xml b/src/main/resources/mapper/TaskMapper.xml
index 3b04bb091476c3bb8705c08c23ade16047e3a84b..390a7af5f04916c34264125f70190ad2873d88e1 100644
--- a/src/main/resources/mapper/TaskMapper.xml
+++ b/src/main/resources/mapper/TaskMapper.xml
@@ -3,14 +3,14 @@
 <mapper namespace="com.example.newgroupshell.mapper.TaskMapper">
 
     <sql id="Base_Column_List">
-        tid, title, description,create_time, update_time,start_time, deadline, assignee_id, creator_id, priority, status
+        id, title, description,create_time, update_time,start_time, deadline, assignee_id, creator_id, priority, status
     </sql>
     <!-- 插入任务 -->
-    <insert id="insertTask" useGeneratedKeys="true" keyProperty="tid"
+    <insert id="insertTask" useGeneratedKeys="true" keyProperty="id"
             parameterType="com.example.newgroupshell.pojo.Task">
         INSERT INTO task
         <trim prefix="(" suffix=")" suffixOverrides=",">
-            <if test="tid != null">tid,</if>
+            <if test="id != null">id,</if>
             <if test="title != null">title,</if>
             <if test="description != null">description,</if>
             <if test="create_time != null">create_time,</if>
@@ -23,7 +23,7 @@
             <if test="status != null">status,</if>
         </trim>
         <trim prefix="values (" suffix=")" suffixOverrides=",">
-            <if test="tid != null">#{tid},</if>
+            <if test="id != null">#{id},</if>
             <if test="title != null">#{title},</if>
             <if test="description != null">#{description},</if>
             <if test="create_time != null">#{createdTime},</if>
@@ -73,14 +73,14 @@
                 status = #{status},
             </if>
         </set>
-        WHERE id = #{tid}
+        WHERE id = #{id}
     </update>
 
     <!-- 删除任务 -->
     <delete id="deleteTaskById">
         DELETE
         FROM task
-        WHERE id = #{tid}
+        WHERE id = #{id}
     </delete>
 
     <!-- 根据指派人ID查找任务 -->