【愚公系列】2023年05月 Java面面刷题系统-003.报表与权限模块

一、报表与权限模块

1. 报表

报表是一种用于展示数据、统计信息、业务流程等的文件或文档，通常用于管理决策、业务分析和信息沟通等方面。报表可以包括表格、图表、图像、文本等形式，通过数据的可视化展示，帮助用户更好地了解业务情况、分析趋势、制定计划、评估绩效等。报表在各种领域都有应用，如财务、市场、生产、人力资源等。

在Java中对于Excel报表的技术实现上也有很多种选择：

• JXL：支持xls文件操作

• POI：支持xls和xlsx文件操作

我们只要来讲POI技术，要使用POI就要导入其坐标，如下

<!--POI-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.0.1</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.0.1</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>4.0.1</version>
</dependency>

1.1 POI写Excel文件

1、在测试包下创建POI测试类：PoiTest

public class PoiTest {

@Test
public void testWriteByPoi() throws IOException {
//1.获取到对应的Excel文件，工作簿文件
Workbook wb = new XSSFWorkbook();
//2.创建工作表
Sheet sheet = wb.createSheet();
wb.createSheet("这是啥呀");

//3.创建工作表中的行对象
Row row = sheet.createRow(1);
//4.创建工作表中行中的列对象
Cell cell = row.createCell(1);
//5.在列中写数据
cell.setCellValue("测试一下单元格");

//创建一个文件对象，作为excel文件内容的输出文件
File f = new File("test.xlsx");
//输出时通过流的形式对外输出，包装对应的目标文件
OutputStream os = new FileOutputStream(f);
//将内存中的workbook数据写入到流中
wb.write(os);
wb.close();
os.close();
}
}

使用单元测试进行测试！

1.2 POI读Excel文件

创建读Excel的测试方法：testReadByPoi

@Test
public void testReadByPoi() throws IOException {
//1.获取要读取的文件工作簿对象
Workbook wb = new XSSFWorkbook("test.xlsx");
//2.获取工作表
Sheet s = wb.getSheetAt(0);
//3.获取行
Row row = s.getRow(3);
//4.获取列
Cell cell = row.getCell(1);
//5.根据数据的类型获取数据
// String data = cell.getStringCellValue();
// double data = cell.getNumericCellValue();
boolean data = cell.getBooleanCellValue();

System.out.println(data);

wb.close();
}

直接读取第一节创建好的Excel文件

1.3 题目模板表头制作

导出报表的模板：资料\Excel解析\模板.xlsx

@Test
public void testProjectPoi() throws IOException {
//1.获取到对应的Excel文件，工作簿文件
Workbook wb = new XSSFWorkbook();
//2.创建工作表
Sheet s = wb.createSheet("题目数据文件");
//制作标题
s.addMergedRegion(new CellRangeAddress(1,1,1,12));
Row row_1 = s.createRow(1);
Cell cell_1_1 = row_1.createCell(1);
cell_1_1.setCellValue("在线试题导出信息");
//创建一个样式
CellStyle cs_title = wb.createCellStyle();
cs_title.setAlignment(HorizontalAlignment.CENTER);
cs_title.setVerticalAlignment(VerticalAlignment.CENTER);
cell_1_1.setCellStyle(cs_title);
//制作表头

//制作数据区

//创建一个文件对象，作为excel文件内容的输出文件
File f = new File("test.xlsx");
//输出时通过流的形式对外输出，包装对应的目标文件
OutputStream os = new FileOutputStream(f);
//将内存中的workbook数据写入到流中
wb.write(os);
wb.close();
os.close();
}

1.4 题目模板标题制作

下面我们接着来做Excel的表头

在测试方法testProjectPoi中继续编写代码

@Test
public void testProjectPoi() throws IOException {
//1.获取到对应的Excel文件，工作簿文件
Workbook wb = new XSSFWorkbook();
//2.创建工作表
Sheet s = wb.createSheet("题目数据文件");
//设置通用配置
// s.setColumnWidth(4,100);
//制作标题
s.addMergedRegion(new CellRangeAddress(1,1,1,12));
Row row_1 = s.createRow(1);
Cell cell_1_1 = row_1.createCell(1);
cell_1_1.setCellValue("在线试题导出信息");
//创建一个样式
CellStyle cs_title = wb.createCellStyle();
cs_title.setAlignment(HorizontalAlignment.CENTER);
cs_title.setVerticalAlignment(VerticalAlignment.CENTER);
cell_1_1.setCellStyle(cs_title);
//制作表头
String[] fields = {"题目ID","所属公司ID","所属目录ID","题目简介","题干描述",
"题干配图","题目分析","题目类型","题目难度","是否经典题","题目状态","审核状态"};
Row row_2 = s.createRow(2);
for (int i = 0; i < fields.length; i++) {
Cell cell_2_temp = row_2.createCell(1 + i); //++
cell_2_temp.setCellValue(fields[i]); //++

CellStyle cs_field = wb.createCellStyle();
cs_field.setAlignment(HorizontalAlignment.CENTER);
cell_2_temp.setCellStyle(cs_field);
}

//制作数据区

//创建一个文件对象，作为excel文件内容的输出文件
File f = new File("test.xlsx");
//输出时通过流的形式对外输出，包装对应的目标文件
OutputStream os = new FileOutputStream(f);
//将内存中的workbook数据写入到流中
wb.write(os);
wb.close();
os.close();
}

1.5 题目模板数据制作

我们继续来做数据区

@Test
public void testProjectPoi() throws IOException {
//1.获取到对应的Excel文件，工作簿文件
Workbook wb = new XSSFWorkbook();
//2.创建工作表
Sheet s = wb.createSheet("题目数据文件");
//设置通用配置
// s.setColumnWidth(4,100);
CellStyle cs_field = wb.createCellStyle();
cs_field.setAlignment(HorizontalAlignment.CENTER);
cs_field.setBorderTop(BorderStyle.THIN);
cs_field.setBorderBottom(BorderStyle.THIN);
cs_field.setBorderLeft(BorderStyle.THIN);
cs_field.setBorderRight(BorderStyle.THIN);


//制作标题
s.addMergedRegion(new CellRangeAddress(1,1,1,12));
Row row_1 = s.createRow(1);
Cell cell_1_1 = row_1.createCell(1);
cell_1_1.setCellValue("在线试题导出信息");
//创建一个样式
CellStyle cs_title = wb.createCellStyle();
cs_title.setAlignment(HorizontalAlignment.CENTER);
cs_title.setVerticalAlignment(VerticalAlignment.CENTER);
cell_1_1.setCellStyle(cs_title);
//制作表头
String[] fields = {"题目ID","所属公司ID","所属目录ID","题目简介","题干描述",
"题干配图","题目分析","题目类型","题目难度","是否经典题","题目状态","审核状态"};
Row row_2 = s.createRow(2);

for (int i = 0; i < fields.length; i++) {
Cell cell_2_temp = row_2.createCell(1 + i); //++
cell_2_temp.setCellValue(fields[i]); //++
cell_2_temp.setCellStyle(cs_field);
}


//制作数据区
List<Question> questionList = new ArrayList<>();
Question qq = new Question();
qq.setId("1");
qq.setPicture("12");
qq.setReviewStatus("13");
qq.setAnalysis("14");
qq.setCatalogId("15");
qq.setCompanyId("16");
qq.setDifficulty("17");
qq.setIsClassic("18");
qq.setRemark("19");
qq.setState("21");
qq.setSubject("31");
qq.setType("41");
questionList.add(qq);
Question qqq = new Question();
qqq.setId("1");
qqq.setPicture("12");
qqq.setReviewStatus("13");
qqq.setAnalysis("14");
qqq.setCatalogId("15");
qqq.setCompanyId("16");
qqq.setDifficulty("17");
qqq.setIsClassic("18");
qqq.setRemark("19");
qqq.setState("21");
qqq.setSubject("31");
qqq.setType("41");
questionList.add(qqq);


int row_index = 0;
for (Question q : questionList) {
int cell_index = 0;
Row row_temp = s.createRow(3 + row_index++);

Cell cell_data_1 = row_temp.createCell(1 + cell_index++);
cell_data_1.setCellValue(q.getId()); //++
cell_data_1.setCellStyle(cs_field);

Cell cell_data_2 = row_temp.createCell(1 + cell_index++);
cell_data_2.setCellValue(q.getCompanyId()); //++
cell_data_2.setCellStyle(cs_field);

Cell cell_data_3 = row_temp.createCell(1 + cell_index++);
cell_data_3.setCellValue(q.getCatalogId()); //++
cell_data_3.setCellStyle(cs_field);

Cell cell_data_4 = row_temp.createCell(1 + cell_index++);
cell_data_4.setCellValue(q.getRemark()); //++
cell_data_4.setCellStyle(cs_field);

Cell cell_data_5 = row_temp.createCell(1 + cell_index++);
cell_data_5.setCellValue(q.getSubject()); //++
cell_data_5.setCellStyle(cs_field);

Cell cell_data_6 = row_temp.createCell(1 + cell_index++);
cell_data_6.setCellValue(q.getPicture()); //++
cell_data_6.setCellStyle(cs_field);

Cell cell_data_7 = row_temp.createCell(1 + cell_index++);
cell_data_7.setCellValue(q.getAnalysis()); //++
cell_data_7.setCellStyle(cs_field);

Cell cell_data_8 = row_temp.createCell(1 + cell_index++);
cell_data_8.setCellValue(q.getType()); //++
cell_data_8.setCellStyle(cs_field);

Cell cell_data_9 = row_temp.createCell(1 + cell_index++);
cell_data_9.setCellValue(q.getDifficulty()); //++
cell_data_9.setCellStyle(cs_field);

Cell cell_data_10 = row_temp.createCell(1 + cell_index++);
cell_data_10.setCellValue(q.getIsClassic()); //++
cell_data_10.setCellStyle(cs_field);

Cell cell_data_11 = row_temp.createCell(1 + cell_index++);
cell_data_11.setCellValue(q.getState()); //++
cell_data_11.setCellStyle(cs_field);

Cell cell_data_12 = row_temp.createCell(1 + cell_index++);
cell_data_12.setCellValue(q.getReviewStatus()); //++
cell_data_12.setCellStyle(cs_field);
}

//创建一个文件对象，作为excel文件内容的输出文件
File f = new File("test.xlsx");
//输出时通过流的形式对外输出，包装对应的目标文件
OutputStream os = new FileOutputStream(f);
//将内存中的workbook数据写入到流中
wb.write(os);
wb.close();
os.close();
}

1.6 题目报表数据准备

1、找到/WEB-INF/pages/store/question/list.jsp页面，修改导出题目的链接

<button type="button" class="btn btn-default" title="导出题目" onclick=location.href="${ctx}/store/question?operation=downloadReport"> <i class="fa fa-download"></i>导出题目</button>

2、在后台servlet中添加对应的方法

// uri:/store/question?operation=list
@WebServlet("/store/question")
public class QuestionServlet extends BaseServlet {

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String operation = request.getParameter("operation");
if("list".equals(operation)){
this.list(request,response);
}
//其他的else if判断省略
else if("downloadReport".equals(operation)){
this.downloadReport(request,response);
}
}

private void downloadReport(HttpServletRequest request, HttpServletResponse response) throws IOException {
//生成报告的文件，然后传递到前端页面
questionService.getReport();
}
}

3、在业务层QuestionService添加一个方法getReport

public void getReport() throws IOException;

4、在对应的实现类中去实现该方法，把之前在测试类中的测试方法testProjectPoi里面的所有代码拷贝过来，其中数据我们应该是从数据库中查询出来，因此调用dao完成数据的查询

@Override
public void getReport() throws IOException{
//获取对应要展示的数据
SqlSession sqlSession = null;
List<Question> questionList = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
QuestionDao questionDao = MapperFactory.getMapper(sqlSession,QuestionDao.class);
//3.调用Dao层操作
questionList = questionDao.findAll();
}catch (Exception e){
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}


//1.获取到对应的Excel文件，工作簿文件
Workbook wb = new XSSFWorkbook();
//2.创建工作表
Sheet s = wb.createSheet("题目数据文件");
//设置通用配置
// s.setColumnWidth(4,100);
CellStyle cs_field = wb.createCellStyle();
cs_field.setAlignment(HorizontalAlignment.CENTER);
cs_field.setBorderTop(BorderStyle.THIN);
cs_field.setBorderBottom(BorderStyle.THIN);
cs_field.setBorderLeft(BorderStyle.THIN);
cs_field.setBorderRight(BorderStyle.THIN);
//制作标题
s.addMergedRegion(new CellRangeAddress(1,1,1,12));
Row row_1 = s.createRow(1);
Cell cell_1_1 = row_1.createCell(1);
cell_1_1.setCellValue("在线试题导出信息");
//创建一个样式
CellStyle cs_title = wb.createCellStyle();
cs_title.setAlignment(HorizontalAlignment.CENTER);
cs_title.setVerticalAlignment(VerticalAlignment.CENTER);
cell_1_1.setCellStyle(cs_title);


//制作表头
String[] fields = {"题目ID","所属公司ID","所属目录ID","题目简介","题干描述",
"题干配图","题目分析","题目类型","题目难度","是否经典题","题目状态","审核状态"};
Row row_2 = s.createRow(2);
for (int i = 0; i < fields.length; i++) {
Cell cell_2_temp = row_2.createCell(1 + i); //++
cell_2_temp.setCellValue(fields[i]); //++
cell_2_temp.setCellStyle(cs_field);
}
//制作数据区
int row_index = 0;
for (Question q : questionList) {
int cell_index = 0;
Row row_temp = s.createRow(3 + row_index++);

Cell cell_data_1 = row_temp.createCell(1 + cell_index++);
cell_data_1.setCellValue(q.getId()); //++
cell_data_1.setCellStyle(cs_field);

Cell cell_data_2 = row_temp.createCell(1 + cell_index++);
cell_data_2.setCellValue(q.getCompanyId()); //++
cell_data_2.setCellStyle(cs_field);

Cell cell_data_3 = row_temp.createCell(1 + cell_index++);
cell_data_3.setCellValue(q.getCatalogId()); //++
cell_data_3.setCellStyle(cs_field);

Cell cell_data_4 = row_temp.createCell(1 + cell_index++);
cell_data_4.setCellValue(q.getRemark()); //++
cell_data_4.setCellStyle(cs_field);

Cell cell_data_5 = row_temp.createCell(1 + cell_index++);
cell_data_5.setCellValue(q.getSubject()); //++
cell_data_5.setCellStyle(cs_field);

Cell cell_data_6 = row_temp.createCell(1 + cell_index++);
cell_data_6.setCellValue(q.getPicture()); //++
cell_data_6.setCellStyle(cs_field);

Cell cell_data_7 = row_temp.createCell(1 + cell_index++);
cell_data_7.setCellValue(q.getAnalysis()); //++
cell_data_7.setCellStyle(cs_field);

Cell cell_data_8 = row_temp.createCell(1 + cell_index++);
cell_data_8.setCellValue(q.getType()); //++
cell_data_8.setCellStyle(cs_field);

Cell cell_data_9 = row_temp.createCell(1 + cell_index++);
cell_data_9.setCellValue(q.getDifficulty()); //++
cell_data_9.setCellStyle(cs_field);

Cell cell_data_10 = row_temp.createCell(1 + cell_index++);
cell_data_10.setCellValue(q.getIsClassic()); //++
cell_data_10.setCellStyle(cs_field);

Cell cell_data_11 = row_temp.createCell(1 + cell_index++);
cell_data_11.setCellValue(q.getState()); //++
cell_data_11.setCellStyle(cs_field);

Cell cell_data_12 = row_temp.createCell(1 + cell_index++);
cell_data_12.setCellValue(q.getReviewStatus()); //++
cell_data_12.setCellStyle(cs_field);
}

//创建一个文件对象，作为excel文件内容的输出文件
File f = new File("test.xlsx");
//输出时通过流的形式对外输出，包装对应的目标文件
OutputStream os = new FileOutputStream(f);
//将内存中的workbook数据写入到流中
wb.write(os);
wb.close();
os.close();
}

1.7 题目报表业务实现

现在后台已经能够生成Excel文件并且填充了数据，但是真实的业务中我们是需要将这个文件下载到客户端

1、修改接口方法getReport，添加返回值

/**
* 获取包含了数据的流对象
* @return 包含了报表数据的流对象
* @throws IOException
*/
ByteArrayOutputStream getReport() throws IOException;

2、在实现类中实现该方法时，将内存中的Excel相关数据写入到ByteArrayOutputStream流中

@Override
public ByteArrayOutputStream getReport() throws IOException {
//前面的代码无变动 故省略


/**
//创建一个文件对象，作为excel文件内容的输出文件
File f = new File("test.xlsx");
//输出时通过流的形式对外输出，包装对应的目标文件
OutputStream os = new FileOutputStream(f);
//将内存中的workbook数据写入到流中
wb.write(os);
wb.close();
os.close();
*/
//将内存中的workbook数据写入到流中
ByteArrayOutputStream os = new ByteArrayOutputStream();
wb.write(os);
wb.close();
return os;
}

3、修改后台servlet的downloadReport方法

private void downloadReport(HttpServletRequest request, HttpServletResponse response) throws IOException {
//返回的数据类型为文件xlsx类型
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
String fileName = new String("测试文件名.xlsx".getBytes(),"iso8859-1");
response.addHeader("Content-Disposition","attachment;fileName="+fileName);

//生成报告的文件，然后传递到前端页面
ByteArrayOutputStream os = questionService.getReport();
//获取产生响应的流对象
ServletOutputStream sos = response.getOutputStream();
//将数据从原始的字节流对象中提取出来写入到servlet对应的输出流中
os.writeTo(sos);
//将输出流刷新
sos.flush();
os.close();
}

2.权限系统设计与开发

2.1 权限系统简介与结构设计

RBAC（Role-Based Access Control）是一种权限控制模型，基于角色的访问控制。它将用户和资源分配到不同的角色中，用户只能在其角色所允许的范围内访问资源，从而实现对系统的安全控制。

RBAC模型包括以下四个主要组成部分：

• 用户：系统中使用资源的人员。

• 角色：用户的职责或职位。角色是在系统中执行操作的访问控制的基本单元。

• 权限：操作或任务的权限，如访问文件或运行程序。

• 资源：系统中需要受保护的对象，如文件、数据库等。

在RBAC模型中，管理员首先定义角色和相关的权限，然后将用户分配到角色中。用户只能访问其所属角色的权限和资源，无法访问其他角色的资源。这种模型可以有效地减少管理工作量和提高系统的安全性。

RBAC模型还可以通过角色继承和用户组来进一步扩展。角色继承允许一个角色继承另一个角色的权限，从而简化了角色的管理。用户组允许将一组用户分配到同一角色中，从而更好地管理用户和角色。

2.2 角色与模块功能快速开发

1、创建角色实体：Role

public class Role {
private String id;
private String name;
private String remark;
private Date createTime;
// getter/setter略
}

2、创建角色Dao：RoleDao

public interface RoleDao {
int save(Role role);

int delete(Role role);

int update(Role role);

Role findById(String id);

List<Role> findAll();
}

3、创建业务层接口：RoleService

public interface RoleService {
/**
* 添加
* @param role
* @return
*/
void save(Role role);

/**
* 删除
* @param role
* @return
*/
void delete(Role role);

/**
* 修改
* @param role
* @return
*/
void update(Role role);

/**
* 查询单个
* @param id 查询的条件（id）
* @return 查询的结果，单个对象
*/
Role findById(String id);

/**
* 查询全部的数据
* @return 全部数据的列表对象
*/
List<Role> findAll();

/**
* 分页查询数据
* @param page 页码
* @param size 每页显示的数据总量
* @return
*/
PageInfo findAll(int page, int size);
}

4、创建接口的实现：com.itheima.service.system.impl

public class RoleServiceImpl implements RoleService {
@Override
public void save(Role role) {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
RoleDao roleDao = MapperFactory.getMapper(sqlSession,RoleDao.class);
//id使用UUID的生成策略来获取
String id = UUID.randomUUID().toString();
role.setId(id);
//3.调用Dao层操作
roleDao.save(role);
//4.提交事务
TransactionUtil.commit(sqlSession);
}catch (Exception e){
TransactionUtil.rollback(sqlSession);
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}

@Override
public void delete(Role role) {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
RoleDao roleDao = MapperFactory.getMapper(sqlSession,RoleDao.class);
//3.调用Dao层操作
roleDao.delete(role);
//4.提交事务
TransactionUtil.commit(sqlSession);
}catch (Exception e){
TransactionUtil.rollback(sqlSession);
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}

@Override
public void update(Role role) {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
RoleDao roleDao = MapperFactory.getMapper(sqlSession,RoleDao.class);
//3.调用Dao层操作
roleDao.update(role);
//4.提交事务
TransactionUtil.commit(sqlSession);
}catch (Exception e){
TransactionUtil.rollback(sqlSession);
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}

@Override
public Role findById(String id) {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
RoleDao roleDao = MapperFactory.getMapper(sqlSession,RoleDao.class);
//3.调用Dao层操作
return roleDao.findById(id);
}catch (Exception e){
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}

@Override
public List<Role> findAll() {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
RoleDao roleDao = MapperFactory.getMapper(sqlSession,RoleDao.class);
//3.调用Dao层操作
return roleDao.findAll();
}catch (Exception e){
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}

@Override
public PageInfo findAll(int page, int size) {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
RoleDao roleDao = MapperFactory.getMapper(sqlSession,RoleDao.class);
//3.调用Dao层操作
PageHelper.startPage(page,size);
List<Role> all = roleDao.findAll();
PageInfo pageInfo = new PageInfo(all);
return pageInfo;
}catch (Exception e){
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}
}

5、创建sevlet：RoleServlet

// uri:/system/role?operation=list
@WebServlet("/system/role")
public class RoleServlet extends BaseServlet {

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String operation = request.getParameter("operation");
if("list".equals(operation)){
this.list(request,response);
}else if("toAdd".equals(operation)){
this.toAdd(request,response);
}else if("save".equals(operation)){
this.save(request, response);
}else if("toEdit".equals(operation)){
this.toEdit(request,response);
}else if("edit".equals(operation)){
this.edit(request,response);
}else if("delete".equals(operation)){
this.delete(request,response);
}else if("author".equals(operation)){
this.author(request,response);
}
}

private void list(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
//进入列表页
//获取数据
int page = 1;
int size = 5;
if(StringUtils.isNotBlank(request.getParameter("page"))){
page = Integer.parseInt(request.getParameter("page"));
}
if(StringUtils.isNotBlank(request.getParameter("size"))){
size = Integer.parseInt(request.getParameter("size"));
}
PageInfo all = roleService.findAll(page, size);
//将数据保存到指定的位置
request.setAttribute("page",all);
//跳转页面
request.getRequestDispatcher("/WEB-INF/pages/system/role/list.jsp").forward(request,response);
}

private void toAdd(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
//加载所有的部门信息放入到roleList
List<Role> all = roleService.findAll();
request.setAttribute("roleList",all);
//跳转页面
request.getRequestDispatcher("/WEB-INF/pages/system/role/add.jsp").forward(request,response);
}

private void save(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
//将数据获取到，封装成一个对象
Role role = BeanUtil.fillBean(request,Role.class,"yyyy-MM-dd");
//调用业务层接口save
roleService.save(role);
//跳转回到页面list
response.sendRedirect(request.getContextPath()+"/system/role?operation=list");
}

private void toEdit(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//查询要修改的数据findById
String id = request.getParameter("id");
Role role = roleService.findById(id);
//将数据加载到指定区域，供页面获取
request.setAttribute("role",role);
//跳转页面
request.getRequestDispatcher("/WEB-INF/pages/system/role/update.jsp").forward(request,response);
}

private void edit(HttpServletRequest request, HttpServletResponse response) throws IOException {
//将数据获取到，封装成一个对象
Role role = BeanUtil.fillBean(request,Role.class,"yyyy-MM-dd");
//调用业务层接口save
roleService.update(role);
//跳转回到页面list
response.sendRedirect(request.getContextPath()+"/system/role?operation=list");
}

private void delete(HttpServletRequest request, HttpServletResponse response) throws IOException {
//将数据获取到，封装成一个对象
Role role = BeanUtil.fillBean(request,Role.class);
//调用业务层接口save
roleService.delete(role);
//跳转回到页面list
response.sendRedirect(request.getContextPath()+"/system/role?operation=list");
}

private void author(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
//获取要授权的角色id
String roleId = request.getParameter("id");
//使用id查询对应的数据（角色id对应的模块信息）
Role role = roleService.findById(roleId);
request.setAttribute("role",role);
//根据当前的角色id获取所有的模块数据，并加载关系数据
List<Map> map = moduleService.findAuthorDataByRoleId(roleId);
//map转成json数据
ObjectMapper om = new ObjectMapper();
String json = om.writeValueAsString(map);
request.setAttribute("roleModuleJson",json);
// TODO 数据未查询
//跳转到树页面中
request.getRequestDispatcher("/WEB-INF/pages/system/role/author.jsp").forward(request,response);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request,response);
}
}

同时需要在BaseServlet中添加RoleService

public class BaseServlet extends HttpServlet {
protected CompanyService companyService;
protected DeptService deptService;
protected UserService userService;
protected CourseService courseService;
protected CatalogService catalogService;
protected QuestionService questionService;
protected QuestionItemService questionItemService;
protected RoleService roleService;

@Override
public void init() throws ServletException {
companyService = new CompanyServiceImpl();
deptService = new DeptServiceImpl();
userService = new UserServiceImpl();
courseService = new CourseServiceImpl();
catalogService = new CatalogServiceImpl();
questionService = new QuestionServiceImpl();
questionItemService = new QuestionItemServiceImpl();
roleService = new RoleServiceImpl();
}
}

按照相同的方式将模块的相关功能快速开发完成

1、创建模块实体：Module

public class Module {
private String id;
private String parentId;
private String name;
private Long ctype;
private Long state;
private String curl;
private String remark;

private Module module;
// getter/setter略
}

2、创建模块dao：ModuleDao

public interface ModuleDao {
int save(Module module);

int delete(Module module);

int update(Module module);

Module findById(String id);

List<Module> findAll();
}

3、创建业务层接口：ModuleService

public interface ModuleService {
/**
* 添加
* @param module
* @return
*/
void save(Module module);

/**
* 删除
* @param module
* @return
*/
void delete(Module module);

/**
* 修改
* @param module
* @return
*/
void update(Module module);

/**
* 查询单个
* @param id 查询的条件（id）
* @return 查询的结果，单个对象
*/
Module findById(String id);

/**
* 查询全部的数据
* @return 全部数据的列表对象
*/
List<Module> findAll();

/**
* 分页查询数据
* @param page 页码
* @param size 每页显示的数据总量
* @return
*/
PageInfo findAll(int page, int size);

}

4、创建业务层实现类：ModuleServiceImpl

public class ModuleServiceImpl implements ModuleService {
@Override
public void save(Module module) {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
ModuleDao moduleDao = MapperFactory.getMapper(sqlSession,ModuleDao.class);
//id使用UUID的生成策略来获取
String id = UUID.randomUUID().toString();
module.setId(id);
//3.调用Dao层操作
moduleDao.save(module);
//4.提交事务
TransactionUtil.commit(sqlSession);
}catch (Exception e){
TransactionUtil.rollback(sqlSession);
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}

@Override
public void delete(Module module) {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
ModuleDao moduleDao = MapperFactory.getMapper(sqlSession,ModuleDao.class);
//3.调用Dao层操作
moduleDao.delete(module);
//4.提交事务
TransactionUtil.commit(sqlSession);
}catch (Exception e){
TransactionUtil.rollback(sqlSession);
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}

@Override
public void update(Module module) {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
ModuleDao moduleDao = MapperFactory.getMapper(sqlSession,ModuleDao.class);
//3.调用Dao层操作
moduleDao.update(module);
//4.提交事务
TransactionUtil.commit(sqlSession);
}catch (Exception e){
TransactionUtil.rollback(sqlSession);
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}

@Override
public Module findById(String id) {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
ModuleDao moduleDao = MapperFactory.getMapper(sqlSession,ModuleDao.class);
//3.调用Dao层操作
return moduleDao.findById(id);
}catch (Exception e){
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}

@Override
public List<Module> findAll() {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
ModuleDao moduleDao = MapperFactory.getMapper(sqlSession,ModuleDao.class);
//3.调用Dao层操作
return moduleDao.findAll();
}catch (Exception e){
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}

@Override
public PageInfo findAll(int page, int size) {
SqlSession sqlSession = null;
try{
//1.获取SqlSession
sqlSession = MapperFactory.getSqlSession();
//2.获取Dao
ModuleDao moduleDao = MapperFactory.getMapper(sqlSession,ModuleDao.class);
//3.调用Dao层操作
PageHelper.startPage(page,size);
List<Module> all = moduleDao.findAll();
PageInfo pageInfo = new PageInfo(all);
return pageInfo;
}catch (Exception e){
throw new RuntimeException(e);
//记录日志
}finally {
try {
TransactionUtil.close(sqlSession);
}catch (Exception e){
e.printStackTrace();
}
}
}
}

5、创建servlet：ModuleServlet

// uri:/system/module?operation=list
@WebServlet("/system/module")
public class ModuleServlet extends BaseServlet {

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String operation = request.getParameter("operation");
if("list".equals(operation)){
this.list(request,response);
}else if("toAdd".equals(operation)){
this.toAdd(request,response);
}else if("save".equals(operation)){
this.save(request, response);
}else if("toEdit".equals(operation)){
this.toEdit(request,response);
}else if("edit".equals(operation)){
this.edit(request,response);
}else if("delete".equals(operation)){
this.delete(request,response);
}
}

private void list(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
//进入列表页
//获取数据
int page = 1;
int size = 10;
if(StringUtils.isNotBlank(request.getParameter("page"))){
page = Integer.parseInt(request.getParameter("page"));
}
if(StringUtils.isNotBlank(request.getParameter("size"))){
size = Integer.parseInt(request.getParameter("size"));
}
PageInfo all = moduleService.findAll(page, size);
//将数据保存到指定的位置
request.setAttribute("page",all);
//跳转页面
request.getRequestDispatcher("/WEB-INF/pages/system/module/list.jsp").forward(request,response);
}

private void toAdd(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
//加载所有的信息放入到moduleList
List<Module> all = moduleService.findAll();
request.setAttribute("moduleList",all);
//跳转页面
request.getRequestDispatcher("/WEB-INF/pages/system/module/add.jsp").forward(request,response);
}

private void save(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
//将数据获取到，封装成一个对象
Module module = BeanUtil.fillBean(request,Module.class,"yyyy-MM-dd");
//调用业务层接口save
moduleService.save(module);
//跳转回到页面list
response.sendRedirect(request.getContextPath()+"/system/module?operation=list");
}

private void toEdit(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//查询要修改的数据findById
String id = request.getParameter("id");
Module module = moduleService.findById(id);
//将数据加载到指定区域，供页面获取
request.setAttribute("module",module);
//跳转页面
request.getRequestDispatcher("/WEB-INF/pages/system/module/update.jsp").forward(request,response);
}

private void edit(HttpServletRequest request, HttpServletResponse response) throws IOException {
//将数据获取到，封装成一个对象
Module module = BeanUtil.fillBean(request,Module.class,"yyyy-MM-dd");
//调用业务层接口save
moduleService.update(module);
//跳转回到页面list
response.sendRedirect(request.getContextPath()+"/system/module?operation=list");
}

private void delete(HttpServletRequest request, HttpServletResponse response) throws IOException {
//将数据获取到，封装成一个对象
Module module = BeanUtil.fillBean(request,Module.class);
//调用业务层接口save
moduleService.delete(module);
//跳转回到页面list
response.sendRedirect(request.getContextPath()+"/system/module?operation=list");
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request,response);
}
}

同时需要在BserServlet中添加ModuleService

public class BaseServlet extends HttpServlet {
protected CompanyService companyService;
protected DeptService deptService;
protected UserService userService;
protected CourseService courseService;
protected CatalogService catalogService;
protected QuestionService questionService;
protected QuestionItemService questionItemService;
protected RoleService roleService;
protected ModuleService moduleService;

@Override
public void init() throws ServletException {
companyService = new CompanyServiceImpl();
deptService = new DeptServiceImpl();
userService = new UserServiceImpl();
courseService = new CourseServiceImpl();
catalogService = new CatalogServiceImpl();
questionService = new QuestionServiceImpl();
questionItemService = new QuestionItemServiceImpl();
roleService = new RoleServiceImpl();
moduleService = new ModuleServiceImpl();
}
}