最近在公司实习时，项目中总遇到excel表的导出，就产生写一个组件实现此功能的想法，在此感谢MaximusGet的帮助，基于jdk1.5元数据注解、注释来实现属性名、列名解耦合，模板组件化，或者可以通过LinkedHashMap实现
package cn.edu.yxy.bean;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* @author 杨新彦
* @ 时间 2012-2-2
* @ 状态 创建
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface ExcelAnnotation {
public int id() default 0;//excel列id
public String name(); //excel列名
}
列名显示顺序比较
package cn.edu.yxy.util;
import java.lang.reflect.Field;
import java.util.Comparator;
import cn.edu.yxy.bean.ExcelAnnotation;
/**
* @author 杨新彦
* @ 时间 2012-2-2
* @ 状态 创建
*/
public class FieldComparator implements Comparator<Object> {
public int compare(Object arg0, Object arg1) {
Field fieldOne = (Field)arg0;
Field fieldTwo = (Field)arg1;
ExcelAnnotation annoOne = fieldOne.getAnnotation(ExcelAnnotation.class);
ExcelAnnotation annoTwo = fieldTwo.getAnnotation(ExcelAnnotation.class);
if(annoOne==null||annoTwo==null){
return 0;
}
int result = annoOne.id()-annoTwo.id();
if(result>0){
return 1;
}else if(result<0){
return -1;
}else {
return 0;
}
}
}
//通用组件
package cn.edu.yxy.util;
import java.io.File;
/**
* @author 杨新彦
* @ 时间 2012-2-2
* @ 状态 创建
*/
public class DataToExcelModel {
private static int sheetCount = 0;
private static int max = 0;
private static List<String> columnArr = null; // 属性名集合
private static List<Method> methodArr = null; // 待打印属性的get方法
/**
*
* @param source 数据源
* @param className 实体类类名
* @param path 文件存放路径
* @return true：执行成功；false：执行失败
* @throws Exception
*/
@SuppressWarnings("all")
public static boolean createExcel(List source,String className,String path,final int pageCount) throws Exception {
HSSFWorkbook wb = new HSSFWorkbook();
if(null != source){
max = source.size(); //总记录数
sheetCount = max / pageCount + (max % pageCount == 0 ? 0 : 1); //总页数
}else{
return createFile(path, wb);
}
Class classEntity = null;
try {
classEntity = Class.forName(className);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
//排序对应的属性名
Field[] arrField = sortArributeName(classEntity);
//生成方法集合并缓存
createMethod(arrField, classEntity);
// 生成对应的方法名,要打印的列名
int nameSize = arrField.length;
for (int i = 0; i < sheetCount; i++) {
HSSFSheet sheet = wb.createSheet("sheet" + i);
HSSFRow row = sheet.createRow(0);
HSSFCell cell = null;
int begin = pageCount * (i);
//打印表头
for (int j = 0; j < nameSize; j++) {
cell = row.createCell((short) j);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(columnArr.get(j));
}
int k = 0;
while (k < pageCount && (begin + k < max)) {
Object object = source.get(begin + k);
row = sheet.createRow(k + 1);
for (int m = 0; m < nameSize; m++) {
cell = row.createCell((short) m);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
try {
cell.setCellValue(null == ((methodArr.get(m)).invoke(object)) ? "" : (methodArr.get(m)).invoke(object).toString());
} catch (Exception e) {
e.printStackTrace();
}
}
k++;
}
}
return createFile(path,wb);
}
private static void createMethod(Field[] arrField,Class<?> classEntity){
String columnName; // 打印的列�
String beanName; // 属性名
String methodName; // 方法名
columnArr = new ArrayList<String>(); // 属性名集合
methodArr = new ArrayList<Method>();
for (Field field : arrField) {
ExcelAnnotation ann = field.getAnnotation(ExcelAnnotation.class);
columnName = ann.name();
columnArr.add(columnName);
beanName = field.getName();
StringBuffer sb = new StringBuffer();
sb.append("get");
sb.append(beanName.substring(0, 1).toUpperCase());
sb.append(beanName.substring(1));
methodName = sb.toString();
Method method = null;
try {
method = classEntity.getMethod(methodName);
} catch (Exception e) {
e.printStackTrace();
}
methodArr.add(method);
}
}
/**
* 生成文件，存放在制定的路径
* @param path 路径
* @param wb HSSFWorkbook
* @return true 执行成功
* @throws IOException
*/
private static boolean createFile(String path,HSSFWorkbook wb){
boolean flag = false;
//判断文件是否存在，若存在删除
File file = new File(path);
if(file.exists()){
file.delete();
}
FileOutputStream out = null;
try {
out = new FileOutputStream(path);
wb.write(out);
flag = true;
} catch (Exception e) {
e.printStackTrace();
}finally{
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return flag;
}
/**
* 排序表头
* @param classEntity
* @return
*/
private static Field[] sortArributeName(Class<?> classEntity){
// 对需要打印的属性名排序
Field[] fields = classEntity.getDeclaredFields();
ArrayList<Field> arrFieldList = new ArrayList<Field>();
for (Field field : fields) {
if (field.isAnnotationPresent(ExcelAnnotation.class)) {
arrFieldList.add(field);
}
}
Field[] arrField = {};
arrField = arrFieldList.toArray(arrField);
//排序显示
Arrays.sort(arrField, new FieldComparator());
return arrField;
}
}
javabean信息
package cn.edu.yxy.bean;
/**
* @author 杨新彦
* @ 时间 2012-2-2
* @ 状态 创建
*/
public class DepartmentBean {
public DepartmentBean() {
super();
}
/**
* id<br>
* 单位id
*/
private long id;
/**
* name<br>
* 单位名称
*/
@ExcelAnnotation(id = 8,name = "单位名称")
private String name;
/**
* code<br>
* 单位编码
*/
@ExcelAnnotation(id = 2,name = "单位编码")
private String code;
// get、set方法
参考http://maximusget.iteye.com/blog/734108