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Java读取Excel文件内容的简单实例

2019年07月22日  | 移动技术网IT编程  | 我要评论

借助于apathe的，由于上传文件不支持.jar所以请下载后将文件改为.jar，在应用程序中添加poi.jar包，并将需要读取的excel文件放入根目录即可

本例使用java来读取excel的内容并展出出结果，代码如下：

复制代码 代码如下:

import java.io.bufferedinputstream;
import java.io.file;
import java.io.fileinputstream;
import java.io.filenotfoundexception;
import java.io.ioexception;
import java.text.decimalformat;
import java.text.simpledateformat;
import java.util.arraylist;
import java.util.arrays;
import java.util.date;
import java.util.list;

import org.apache.poi.hssf.usermodel.hssfcell;
import org.apache.poi.hssf.usermodel.hssfdateutil;
import org.apache.poi.hssf.usermodel.hssfrow;
import org.apache.poi.hssf.usermodel.hssfsheet;
import org.apache.poi.hssf.usermodel.hssfworkbook;
import org.apache.poi.poifs.filesystem.poifsfilesystem;

public class exceloperate {

    public static void main(string[] args) throws exception {
       file file = new file("exceldemo.xls");
       string[][] result = getdata(file, 1);
       int rowlength = result.length;
       for(int i=0;i<rowlength;i++) {
           for(int j=0;j<result[i].length;j++) {
              system.out.print(result[i][j]+"\t\t");
           }
           system.out.println();
       }

    }
    /**
     * 读取excel的内容，第一维数组存储的是一行中格列的值，二维数组存储的是多少个行
     * @param file 读取数据的源excel
     * @param ignorerows 读取数据忽略的行数，比喻行头不需要读入 忽略的行数为1
     * @return 读出的excel中数据的内容
     * @throws filenotfoundexception
     * @throws ioexception
     */
    public static string[][] getdata(file file, int ignorerows)
           throws filenotfoundexception, ioexception {
       list<string[]> result = new arraylist<string[]>();
       int rowsize = 0;
       bufferedinputstream in = new bufferedinputstream(new fileinputstream(
              file));
       // 打开hssfworkbook
       poifsfilesystem fs = new poifsfilesystem(in);
       hssfworkbook wb = new hssfworkbook(fs);
       hssfcell cell = null;
       for (int sheetindex = 0; sheetindex < wb.getnumberofsheets(); sheetindex++) {
           hssfsheet st = wb.getsheetat(sheetindex);
           // 第一行为标题，不取
           for (int rowindex = ignorerows; rowindex <= st.getlastrownum(); rowindex++) {
              hssfrow row = st.getrow(rowindex);
              if (row == null) {
                  continue;
              }
              int temprowsize = row.getlastcellnum() + 1;
              if (temprowsize > rowsize) {
                  rowsize = temprowsize;
              }
              string[] values = new string[rowsize];
              arrays.fill(values, "");
              boolean hasvalue = false;
              for (short columnindex = 0; columnindex <= row.getlastcellnum(); columnindex++) {
                  string value = "";
                  cell = row.getcell(columnindex);
                  if (cell != null) {
                     // 注意：一定要设成这个，否则可能会出现乱码
                     cell.setencoding(hssfcell.encoding_utf_16);
                     switch (cell.getcelltype()) {
                     case hssfcell.cell_type_string:
                         value = cell.getstringcellvalue();
                         break;
                     case hssfcell.cell_type_numeric:
                         if (hssfdateutil.iscelldateformatted(cell)) {
                            date date = cell.getdatecellvalue();
                            if (date != null) {
                                value = new simpledateformat("yyyy-mm-dd")
                                       .format(date);
                            } else {
                                value = "";
                            }
                         } else {
                            value = new decimalformat("0").format(cell
                                   .getnumericcellvalue());
                         }
                         break;
                     case hssfcell.cell_type_formula:
                         // 导入时如果为公式生成的数据则无值
                         if (!cell.getstringcellvalue().equals("")) {
                            value = cell.getstringcellvalue();
                         } else {
                            value = cell.getnumericcellvalue() + "";
                         }
                         break;
                     case hssfcell.cell_type_blank:
                         break;
                     case hssfcell.cell_type_error:
                         value = "";
                         break;
                     case hssfcell.cell_type_boolean:
                         value = (cell.getbooleancellvalue() == true ? "y"
                                : "n");
                         break;
                     default:
                         value = "";
                     }
                  }
                  if (columnindex == 0 && value.trim().equals("")) {
                     break;
                  }
                  values[columnindex] = righttrim(value);
                  hasvalue = true;
              }

              if (hasvalue) {
                  result.add(values);
              }
           }
       }
       in.close();
       string[][] returnarray = new string[result.size()][rowsize];
       for (int i = 0; i < returnarray.length; i++) {
           returnarray[i] = (string[]) result.get(i);
       }
       return returnarray;
    }

    /**
     * 去掉字符串右边的空格
     * @param str 要处理的字符串
     * @return 处理后的字符串
     */
     public static string righttrim(string str) {
       if (str == null) {
           return "";
       }
       int length = str.length();
       for (int i = length - 1; i >= 0; i--) {
           if (str.charat(i) != 0x20) {
              break;
           }
           length--;
       }
       return str.substring(0, length);
    }
}

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