还原Excel内容到 java bean list 的通用方法.

            以前通常会把java bean list 输出为EXCEL文件，作为报表供客户下载，有时候也需要读入客户准备好的Excel文档，并将这些数据导入到数据库中，或者做其他处理, 一般来说导入 excel 文件到内存中应该比较容易，但jxls这个库提供了另外一种处理方式，通过配置文件配置指定导入的column和对应的pojo类的属性.虽然自己也可以做到，但人家已经实现了，还是很方便的, 唯一郁闷的是 导入的jar包比较多，比较变态.

主要用到的工具 jxls: http://jxls./



1. 一个公用的处理方法, 将导入的excel文件转为 java bean list:

程序代码

package com.yihaomen.parseexceltojavabeanlist;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import net.sf.jxls.reader.ReaderBuilder;
import net.sf.jxls.reader.XLSReader;

public class Util<T> {

    public List<T> parseExcelFileToBeans(File xlsFile,
            File jxlsConfigFile)
            throws Exception {
        XLSReader xlsReader = ReaderBuilder.buildFromXML(jxlsConfigFile);
        List<T> result = new ArrayList<T>();
        Map<String, Object> beans = new HashMap<String, Object>();
        beans.put("result", result);
        InputStream inputStream = null;
        try {
            inputStream = new BufferedInputStream(new FileInputStream(xlsFile));
            xlsReader.read(inputStream, beans);            
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            if (inputStream !=null){
                inputStream.close();
            }
        }        
        return result;
        }
}

要转换的java bean 的定义如下:

程序代码

package com.yihaomen.parseexceltojavabeanlist;

public class Person {

      private String firstName;
      private String lastName;
      private int age;

      public Person() {
      }
      public String getFirstName() {
        return firstName;
      }
      public void setFirstName(String firstName) {
        this.firstName = firstName;
      }
      public String getLastName() {
        return lastName;
      }
      public void setLastName(String lastName) {
        this.lastName = lastName;
      }
      public int getAge() {
        return age;
      }
      public void setAge(int age) {
        this.age = age;
      }
    }

重点是配置文件的处理，看 excel 文件 与 java bean之间的 对应关系:

程序代码

<workbook>
  <worksheet name="Sheet1">
    <section startRow="0" endRow="0" />
    <loop startRow="1" endRow="1" items="result" var="person" varType="com.yihaomen.parseexceltojavabeanlist.Person">
      <section startRow="1" endRow="1">
        <mapping row="1" col="0">person.firstName</mapping>
        <mapping row="1" col="1">person.lastName</mapping>
        <mapping row="1" col="2">person.age</mapping>
      </section>
      <loopbreakcondition>
        <rowcheck offset="0">
          <cellcheck offset="0" />
        </rowcheck>
      </loopbreakcondition>
    </loop>
  </worksheet>
</workbook>

测试代码如下:

程序代码

package com.yihaomen.parseexceltojavabeanlist;

import java.io.File;
import java.util.List;

public class TestApp {
    
    public static void main(String[] args) throws Exception {
        String path = System.getProperty("user.dir");
        Util util = new Util<Person>();
        String excelFilePath = path + File.separator + "personData.xls";
        String configFilePath = path + File.separator + "personConfig.xml";
        List<Person> persons = util.parseExcelFileToBeans(new File(excelFilePath),
                new File(configFilePath));
        
        for(Person p : persons){
            System.out.println(p.getFirstName());
        }
        
    }

}

Excel 文件内容如下:

程序代码

FirstName     LastName              Age
Joe                   Bloggs              25
John                    Doe                      30

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