智能供銷系統_7導入導出功能

時間  2019-11-29
標籤 智能 供銷系統 導入 導出 功能 简体版
原文   原文鏈接

用到的技術有EasyPOIjavascript

# 一.導入導出的認識html

> 操做辦公軟件(word,excel,ppt) 03,07
>>  JXL(只支持excel,內存優化) POI(功能強大,支持普遍)java

# POI的基本使用
## 1.1 導包web

<!-- poi支持的jar包 -->
<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi</artifactId>
  <version>3.11</version>
</dependency>
<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi-ooxml</artifactId>
  <version>3.11</version>
</dependency>

 

## 1.2 建立 excel文件 [可經過官方文檔查詢例子]spring

```
//建立一個新的excel,而且寫99乘法表:導出
@Test
public void testCreateExcel() throws Exception{
    //1.建立一個工做薄(在內存中)
    SXSSFWorkbook wb = new SXSSFWorkbook();
    //2.建立一張表格
    Sheet sheet = wb.createSheet("99乘法表");
    //3.在表格建立行
    for(int i=1;i<=9;i++){
        Row row = sheet.createRow(i-1);
        //4.在表格中建立列(格子)
        for(int j=1;j<=i;j++){
            Cell cell = row.createCell(j-1);
            //5.格子中寫東西
            cell.setCellValue(i+"*"+j+"="+(i*j));
        }
    }
    FileOutputStream out = new FileOutputStream("99.xlsx");
    wb.write(out);
    out.close();
}


```
## 1.2 讀取excel文件
```數據庫

//讀取excel:導入
@Test
public void testReadExcel() throws Exception{
    //讀取了emp-poi.xlsx ,建立了Workbook(內存)
    InputStream inp = new FileInputStream("emp-poi.xlsx");
    Workbook wb = WorkbookFactory.create(inp);
    //拿到對應的表
    Sheet sheet = wb.getSheetAt(0);
    //拿到這表的總行數
    int lastRowNum = sheet.getLastRowNum();
    for (int i = 1; i <= lastRowNum; i++) {
        //拿到每一行
        Row row = sheet.getRow(i);
        //拿到這一行的總列數
        short lastCellNum = row.getLastCellNum();
        for (int j = 0; j < lastCellNum; j++) {
            //拿到這一個格子與它的數據
            Cell cell = row.getCell(j);
            System.out.print(cell.getStringCellValue()+" ");
        }
        System.out.println();
    }

}

 

# 三.EasyPOI的使用
> 文檔:http://easypoi.mydoc.io/apache

## 3.1 導包
> 注意:今天使用EasyPOI須要把以前的poi導包去掉緩存

```app

<!-- easypoi的支持 -->
<dependency>
  <groupId>cn.afterturn</groupId>
  <artifactId>easypoi-base</artifactId>
  <version>3.2.0</version>
</dependency>
<dependency>
  <groupId>cn.afterturn</groupId>
  <artifactId>easypoi-web</artifactId>
  <version>3.2.0</version>
</dependency>
<dependency>
  <groupId>cn.afterturn</groupId>
  <artifactId>easypoi-annotation</artifactId>
  <version>3.2.0</version>
</dependency>


```dom

## 3.2 準備domain

@Excel(name="對應Excel表中的頭")

### POIEmployee

```
@ExcelTarget("emp")
public class PoiEmployee {
    @Excel(name = "名稱")
    private String name;
    @Excel(name="郵件",width = 25)
    private String email;
    @Excel(name="年齡")
    private Integer age;
    @Excel(name="性別",replace = {"男_true","女_false"})
    private Boolean sex;
    @Excel(name="出生日期",format = "yyyy-MM-dd")
    private Date bornDate = new Date();
    //type=2:表明這是一張圖片
    @Excel(name = "頭像",type = 2,height = 25)
    private String headImage;
    @ExcelEntity
    private PoiDepartment department;

    // 不要忘了加上getter,setter
}
```

### POIDepartment

```
@ExcelTarget("dept")
public class PoiDepartment {

    @Excel(name="部門名稱_emp,名稱_dept")
    private String name;

    @Excel(name="部門地址_emp,地址_dept")
    private String address;

    @Excel(name="郵件_dept")
    private String email;

    // 不要忘了加上getter,setter
}


```

## 3.3 EasyPOI建立excel文件

```
 

/**
list的值本身準備一下
 * new ExportParams(title,sheetName):導出的屬性設置
    title:表頭名稱
    sheetName：sheet表的名稱
 * PoiEmployee .class：導出的實體類型
 * list:導出的數據（List<PoiEmployee>）
 */
Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("部門名稱","bbb"),
        PoiEmployee.class, list);
FileOutputStream fos = new FileOutputStream("poidept.xlsx");
workbook.write(fos);
fos.close();
```

## 3.4 EasyPOI讀取excel文件
```

ImportParams params = new ImportParams();
    //params.setTitleRows(1);
    params.setHeadRows(1);

    List<PoiEmployee> list = ExcelImportUtil.importExcel(
            new File("poiemp.xlsx"),
            PoiEmployee.class, params);

    list.forEach(e -> {
        System.out.println(e+","+e.getDepartment());
    });


```


# 四 EasyPOI集成SpringMVC完成導入導出

## 4.1 導出功能
> EasyPOI支持SpringMVC

### 4.1.1 掃描view

`<context:component-scan base-package="cn.afterturn.easypoi.view" />

`


### 4.1.2 配置視圖解析器
> p:order="0" 先找這個bean的解析，再找其它的
`

<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" p:order="0" />

`

### 4.1.3 前臺傳入相應的查詢數據
```
 

<form id="searchForm" method="post" action="/employee/download">
    用戶名: <input name="username" class="easyui-textbox" style="width:80px">
    郵件: <input name="email" class="easyui-textbox" style="width:80px">
    部門:
    <input name="departmentId"  class="easyui-combobox"
           data-options="panelHeight:'auto',valueField:'id',textField:'name',url:'/util/deptlist'" />
    <a href="javascript:;" data-method="search" class="easyui-linkbutton" iconCls="icon-search">查詢</a>
    <!-- button不寫type,它就是提交 -->
    <button class="easyui-linkbutton" iconCls="icon-redo">導出</button>
</form>


```

### 4.1.4 後臺接收參數進行導出
> 注：頭像路徑必需是真實路徑,若是打印出來的路徑有誤能夠用字符串工具修改

@RequestMapping("/download")
public String download(ModelMap map, HttpServletRequest request,EmployeeQuery query){
    //拿到全部員工
    List<Employee> employeeList = employeeService.findByQuery(query);
    //拿到當前項目的路徑
    String realPath = request.getServletContext().getRealPath("");
    //修改(拼接)員工頭像的路徑
    employeeList.forEach(e -> {
        e.setHeadImage(realPath+e.getHeadImage());
    });

    ExportParams params = new ExportParams("員工信息", "列表", ExcelType.XSSF);
    params.setFreezeCol(5);

    map.put(NormalExcelConstants.DATA_LIST, employeeList); // 數據集合
    map.put(NormalExcelConstants.CLASS, Employee.class);//導出實體
    map.put(NormalExcelConstants.PARAMS, params);//參數
    map.put(NormalExcelConstants.FILE_NAME, "employee");//文件名稱
    //easypoiExcelView
    return NormalExcelConstants.EASYPOI_EXCEL_VIEW;//View名稱
}


```


## 4.2 導入功能

### 4.2.1 訪問頁面

#### ImportController```

@RequestMapping("/import")
public class ImportController {

    @RequestMapping("/index")
    public String index(){
        return "import";
    }
}


```

#### import.jsp
```

<!-- 注意:上傳須要加enctype -->
<form method="post" action="/import/empXlsx" enctype="multipart/form-data">
    <input class="easyui-filebox" name="empFile" data-options="prompt:'選擇一個excel文件..'" style="width:80%">
    <button class="easyui-linkbutton">導入</button>
</form>


```


### 4.2.1 導入實現

> 上傳解析器必定要有名字：multipartResolver
> 必需加一個默認密碼,由於配有默認的密碼加密,因此咱們也須要加密後再存,這裏直接用
> 員工對應的部門必需有id(根據名稱拿到對應的部門)

```
@RequestMapping("/empXlsx")
public String empXlsx(MultipartFile empFile) throws Exception{
//        System.out.println(empFile);
//        System.out.println(empFile.getName());  //empFile:上傳控件名稱
//        System.out.println(empFile.getOriginalFilename()); //emp.xlsx:上傳的文件名稱
//        System.out.println(empFile.getSize()); //文件大小
//        System.out.println(empFile.getContentType());//文件的memi類型
//        System.out.println(empFile.getInputStream());
    //準備一些導入的參數
    ImportParams params = new ImportParams();
    params.setTitleRows(1);
    params.setHeadRows(1);
    //把上傳的excel文件中的數據變成Employee
    List<Employee> list = ExcelImportUtil.importExcel(
            empFile.getInputStream(),
            Employee.class, params);

    //把員工進行保存
    list.forEach(e -> {
        //設置一個默認密碼
        e.setPassword("123456");
        //根據名稱到數據庫中拿到部門
        Department department = e.getDepartment();
        if(department!=null){
            Department dbDept =  departmentService.findByName(department.getName());
            e.setDepartment(dbDept);
        }
        employeeService.save(e);
    });


    return "import";
}
```

## 4.3 導入驗證
> 使用的是JSR 303 規範----缺乏這個包會致使驗證功能失敗/報錯

### 4.3.1 導入驗證包
```

<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-validator</artifactId>
  <version>5.2.4.Final</version>
</dependency>


```

### 4.3.2 加上驗證的註解```

@Excel(name = "用戶名")
@NotNull(message = "用戶名不能爲空")
private String username;
private String password;
@Excel(name = "郵箱",width = 25)
private String email;

@Excel(name = "年齡")
@Max(value=80,message = "年齡不能超過80歲")
@Min(value = 20,message = "年齡不能小於20歲")
private Integer age;

@Excel(name="頭像",type = 2,height = 25)
private String headImage; //頭像

//jpa在管理的懶加載對象
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="department_id")
@ExcelEntity  //缺乏這個註解沒法再表格中讀取到這個屬性
private Department department;


```

### 4.3.3 加上自定義註解
> 不要忘了,這個類型是須要Spring掃描
```

@Component
public class EmployeeExcelVerifyHandler implements IExcelVerifyHandler<Employee> {

    @Autowired
    private IEmployeeService employeeService;

    @Override
    public ExcelVerifyHandlerResult verifyHandler(Employee employee) {
        //若是用戶存在，咱們就返回一個false
        //  checkUsername:這個用戶名是否可使用
        if(!employeeService.checkUsername(employee.getUsername())){
            ExcelVerifyHandlerResult result = new ExcelVerifyHandlerResult(false);
            result.setMsg("用戶名已經存在！");
            return result;
        }
        return  new ExcelVerifyHandlerResult(true);
    }
}


```

### 4.3.3 導入功能修改

> 要驗證，必需設置  params.setNeedVerfiy(true);
>> 自定義驗證:params.setVerifyHandler(employeeExcelVerifyHandler);
>>> result.getList(); 拿到全部經過驗證的數據
>> result.getFailList():拿到全部錯誤的數據
> result.getFailWorkbook();拿到錯誤的文本```

@Autowired
private EmployeeExcelVerifyHandler employeeExcelVerifyHandler;
...
@RequestMapping("/empXlsx")
public String empXlsx(MultipartFile empFile, HttpServletResponse response) throws Exception{
    //準備一些導入的參數
    ImportParams params = new ImportParams();
    params.setTitleRows(1);
    params.setHeadRows(1);
    params.setNeedVerfiy(true); //須要作驗證
    //設置驗證處理器
    params.setVerifyHandler(employeeExcelVerifyHandler);

    //把上傳的excel文件中的數據變成Employee
    ExcelImportResult<Employee> result = ExcelImportUtil.importExcelMore(
            empFile.getInputStream(),
            Employee.class, params);

    //拿到相應的值
    List<Employee> list = result.getList();
    //把員工進行保存
    list.forEach(e -> {
        //設置一個默認密碼
        e.setPassword("123456");
        //根據名稱到數據庫中拿到部門
        Department department = e.getDepartment();
        if(department!=null){
            Department dbDept =  departmentService.findByName(department.getName());
            e.setDepartment(dbDept);
        }
        employeeService.save(e);
    });

    //拿到錯誤的值
//        List<Employee> errList = result.getFailList();
//        errList.forEach(e -> System.out.println("錯誤的："+e));
    //有錯誤的狀況進行導出
    if(result.isVerfiyFail()){
        //拿到錯誤的文件
        Workbook failWorkbook = result.getFailWorkbook();
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); //mime類型
        response.setHeader("Content-disposition", "attachment;filename=error.xlsx");
        response.setHeader("Pragma", "No-cache");//設置不要緩存
        OutputStream ouputStream = response.getOutputStream();
        failWorkbook.write(ouputStream);
        ouputStream.flush();
        ouputStream.close();
    }
    return "import";
}

```

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