增加excel导出通用组件

build.gradle

@@ -21,7 +21,7 @@ allprojects {
 
 subprojects {
     ext {
-        version '0.5.0'
+        version '0.5.1'
         spring_version = "2.3.0.RELEASE"
     }
 

src/gaea.app/build.gradle

@@ -3,6 +3,7 @@ dependencies {
     compile("org.springframework.boot:spring-boot-starter-web:$spring_version")
     compile("org.springframework.boot:spring-boot-starter-mail:$spring_version")
     compile group: 'net.sf.dozer', name: 'dozer', version: '5.5.1'
+    compile group: 'org.apache.poi', name: 'poi', version: '4.1.2'
 }
 
 publishing {

src/gaea.app/src/main/kotlin/com/synebula/gaea/app/component/poi/excel/Excel.kt

@@ -0,0 +1,107 @@
+package com.synebula.gaea.app.component.poi.excel
+
+import org.apache.poi.hssf.usermodel.HSSFCell
+import org.apache.poi.hssf.usermodel.HSSFCellStyle
+import org.apache.poi.hssf.usermodel.HSSFWorkbook
+import org.apache.poi.ss.usermodel.BorderStyle
+import org.apache.poi.ss.usermodel.HorizontalAlignment
+import org.apache.poi.ss.usermodel.Sheet
+import org.apache.poi.ss.usermodel.VerticalAlignment
+import java.lang.Exception
+import java.lang.RuntimeException
+import kotlin.math.ceil
+
+/**
+ * Excel操作对象
+ */
+object Excel {
+
+    /**
+     * 导出excel
+     *
+     * @param data 需要导出的数据
+     * @return excel表格数据
+     */
+    fun export(data: ExcelData, writeTo: (wb: HSSFWorkbook) -> Unit) {
+        // 第一步，创建一个HSSFWorkbook，对应一个Excel文件
+        val wb = HSSFWorkbook()
+        // 第二步，在workbook中添加一个sheet,对应Excel文件中的sheet，并设置默认样式
+        val sheet = wb.createSheet(data.title)
+
+        // 第四步，创建单元格，并设置值表头 设置表头居中
+        val titleStyle = wb.createCellStyle()
+        titleStyle.alignment = HorizontalAlignment.CENTER// 创建一个居中格式
+        titleStyle.verticalAlignment = VerticalAlignment.CENTER
+        val titleFont = wb.createFont()
+        titleFont.bold = true
+        titleStyle.setFont(titleFont)
+        this.setBorderStyle(titleStyle, BorderStyle.THIN)
+
+        //声明列对象
+        // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
+        var row = sheet.createRow(0)
+        row.height = 25 * 20
+        var cell: HSSFCell
+        //创建标题
+        for (col in data.columnNames.indices) {
+            try {
+                cell = row.createCell(col)
+                cell.setCellStyle(titleStyle)
+                cell.setCellValue(data.columnNames[col])
+                this.setColumnWidth(data.columnNames[col], col, sheet)
+            } catch (ex: RuntimeException) {
+                throw Exception("创建索引${col}列[${data.columnNames[col]}]时出现异常", ex)
+            }
+        }
+
+        val contentStyle = wb.createCellStyle()
+        contentStyle.alignment = HorizontalAlignment.LEFT// 创建一个修改居左格式
+        contentStyle.verticalAlignment = VerticalAlignment.CENTER
+        this.setBorderStyle(contentStyle, BorderStyle.THIN)
+
+        //创建内容
+        var col = 0
+        for (i in data.data.indices) {
+            try {
+                row = sheet.createRow(i + 1)
+                row.height = 20 * 20
+                col = 0
+                while (col < data.data[i].size) {
+                    cell = row.createCell(col)
+                    cell.setCellStyle(contentStyle)
+                    cell.setCellValue(data.data[i][col])
+                    this.setColumnWidth(data.data[i][col], col, sheet)
+
+                    col++
+                }
+            } catch (ex: RuntimeException) {
+                throw Exception("创建索引${i}行[${data.columnNames[col]}]时出现异常", ex)
+            }
+        }
+        writeTo(wb)
+    }
+
+    /**
+     * 设置列宽
+     *
+     * @param content 列内容
+     * @param col 列索引
+     * @param sheet 需要设置的表格
+     */
+    private fun setColumnWidth(content: String, col: Int, sheet: Sheet) {
+        //设置列宽
+        val width = (content.length * 1.5 * 256).toInt()
+        if (width > sheet.getColumnWidth(col))
+            sheet.setColumnWidth(col, width)
+    }
+
+    /**
+     * 设置cell style的边框
+     */
+    private fun setBorderStyle(style: HSSFCellStyle, borderStyle: BorderStyle) {
+        style.borderTop = borderStyle
+        style.borderRight = borderStyle
+        style.borderBottom = borderStyle
+        style.borderLeft = borderStyle
+    }
+}

src/gaea.app/src/main/kotlin/com/synebula/gaea/app/component/poi/excel/ExcelData.kt

@@ -0,0 +1,5 @@
+package com.synebula.gaea.app.component.poi.excel
+
+class ExcelData(var title: String = "",
+                var columnNames: List<String> = listOf(),
+                var data: List<List<String>> = listOf())