导入jar包.png

二、直接贴简单的学习代码

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Date;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

public class ReadFile {
     public void reader(String filePath) {
            try {
                File file = new File(filePath);
                if (file.isFile() && file.exists()) {
                    InputStreamReader read = new InputStreamReader(new FileInputStream(file), "UTF-8");
                    BufferedReader br = new BufferedReader(read);
                    String s = "";
                    String tmpstr = "";
                    while ((s = br.readLine()) != null) {
                        tmpstr += s;
                    }
                    if (tmpstr != null) {
                        process(tmpstr);
                    } 
                    System.out.println("--- end ---");
                }
            }catch (IOException e) {
                System.out.println("Error reading file content!");
                e.printStackTrace();
            }
            
        }
     
     /**
      * {
            success: true,
            root: [{
                type: 'long',
                propName: 'xmpp.nat.serverport',
                location: '0',
                propValue: '5228',
                desc: '打洞服务器端口 5228(缺省)'
            }, {
                type: 'char',
                propName: 'xmpp.security.default.pi.level',
                location: '0',
                propValue: '-1',
                desc: '缺省主控方继承级别 -1表示继承所有顶级部门权限(缺省) 0只是继承一级部门'
            }]
        }
      * @param txtStr
      */
     
     private static void process(String txtStr) {
            JSONObject json = JSONObject.parseObject(txtStr);
            Object datas = json.get("root");
            List<Property> root_list = JSON.parseArray(datas+"", Property.class);
            //创建工作簿
            HSSFWorkbook workBook = new HSSFWorkbook();
            //创建工作表  工作表的名字叫helloWorld
            HSSFSheet sheet = workBook.createSheet("系统属性");
            for(int i=0; i<root_list.size(); i++) {
                //创建行,第3行
                HSSFRow row0 = sheet.createRow(i);
                //创建单元格，操作第三行第三列
                HSSFCell cell0 = row0.createCell(0);
                HSSFCell cell1 = row0.createCell(1);
                HSSFCell cell2 = row0.createCell(2);
                cell0.setCellValue(root_list.get(i).getPropName());
                cell1.setCellValue(root_list.get(i).getPropValue());
                cell2.setCellValue(root_list.get(i).getDesc());
                
            }
            FileOutputStream fout = null;
            Date date = new Date();
            try {
                fout = new FileOutputStream(new File("C:\\Users\\Administrator\\Desktop\\property("+date.getTime()+").xls"));
            } catch (FileNotFoundException e1) {
                e1.printStackTrace();
            }
            try {
                workBook.write(fout);
            } catch (IOException e1) {
                e1.printStackTrace();
            }
            try {
                fout.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
                workBook.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
}