Java读取创建Excel；验签，加密

Posted 2020-08-23 学习是不让自己瞎想的最好方式

需要架包：poi相关jar,Md5.jar
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package com.fanqi.test;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.json.JSONArray;
import org.json.JSONObject;

public class TestDemo1 {
	
	/*
	 * 读取Excel数据
	 */
	public List<Map<String, Object>> readExcel(String filename) {
		
		FileInputStream in;
		XSSFWorkbook workbook = null;
		try {
			in = new FileInputStream(filename);
			workbook = new XSSFWorkbook(in);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		XSSFSheet sheet = workbook.getSheetAt(0);
		int num = 0;
		List<Map<String, Object>> listCanshu = new ArrayList<Map<String, Object>>();
			for(int i=1;i<=sheet.getLastRowNum();i++){
				Map<String, Object> map = new TreeMap<String, Object>();
				String  cell0 = sheet.getRow(i).getCell(0).getStringCellValue();
				String  cell1 = sheet.getRow(i).getCell(1).getStringCellValue();
				map.put("canshu1", cell0);
				map.put("canshu2", cell1);
				listCanshu.add(map);
		}
			return listCanshu;	
	}
	/*
	 * 组装成JSON形式
	 */
	public JSONArray zuZhuangCanShu(List<Map<String, Object>> listCanshu) {
		
		JSONArray jArray = new JSONArray();
		for(int i=0;i<listCanshu.size();i++ ){
			JSONObject json = new JSONObject(listCanshu.get(i));
			jArray.put(json);
		}
		return jArray;		
	}
	/*
	 * 验签，加密
	 */
	public List signMD5(List<Map<String, Object>> l) {
		
		List list = new ArrayList();
		for(int i=0;i<l.size();i++){
			String str = "";
			StringBuffer buffer = null;
			byte[] result = null;
			Set set = l.get(i).entrySet();
			Iterator it = set.iterator();
			while(it.hasNext()){
				Map.Entry mapEntry = (Map.Entry) it.next();
				String key = (String) mapEntry.getKey();
				String value = (String) mapEntry.getValue();
				str = str + key + "=" + value + "&";
			}
			str = str.substring(0, str.length()-1);
			try {
				MessageDigest md = MessageDigest.getInstance("MD5");
				result = md.digest(str.getBytes());
				buffer = new StringBuffer();
				for(byte r : result){
					String s =Integer.toHexString(0xff & r);
					if(s.length()==1){
						buffer.append("0"+s);
					}else{
						buffer.append(s);
					}
				}
				
			} catch (NoSuchAlgorithmException e) {
				e.printStackTrace();
			}
			list.add(buffer.toString());
		}
		
		return list;	
	}
	
	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		TestDemo1 t = new TestDemo1();
		List<Map<String, Object>> l = t.readExcel("D:\\1.xlsx");
		JSONArray jArray = t.zuZhuangCanShu(l);		
		List list = t.signMD5(l);
		System.out.println(list.get(0));
		System.out.println(list.get(1));
		System.out.println(list.get(2));
	}

}

 

 1 package cn.fanqi.fq;
 2 
 3 import java.io.FileNotFoundException;
 4 import java.io.FileOutputStream;
 5 import java.io.IOException;
 6 import java.util.ArrayList;
 7 import org.apache.poi.ss.usermodel.IndexedColors;
 8 import org.apache.poi.xssf.usermodel.XSSFCellStyle;
 9 import org.apache.poi.xssf.usermodel.XSSFFont;
10 import org.apache.poi.xssf.usermodel.XSSFRow;
11 import org.apache.poi.xssf.usermodel.XSSFSheet;
12 import org.apache.poi.xssf.usermodel.XSSFWorkbook;
13 
14 public class TestDemo {
15 
16 public void createExcel() {
17 
18 XSSFWorkbook x = new XSSFWorkbook();
19 
20 XSSFFont font1 = x.createFont();
21 font1.setFontHeightInPoints((short) 15);
22 font1.setFontName("Pristina");
23 font1.setColor(IndexedColors.GREEN.index);
24 //font1.setColor(HSSFColor.YELLOW.index);
25 XSSFCellStyle style = x.createCellStyle();
26 style.setFont(font1);
27 
28 XSSFSheet sheet = x.createSheet();
29 XSSFRow row0 = sheet.createRow(0);
30 row0.createCell(0).setCellValue("姓名");
31 row0.getCell(0).setCellStyle(style);
32 row0.createCell(1).setCellValue("性别");
33 row0.getCell(1).setCellStyle(style);
34 row0.createCell(2).setCellValue("年龄");
35 row0.getCell(2).setCellStyle(style);
36 row0.createCell(3).setCellValue("职位");
37 row0.getCell(3).setCellStyle(style);
38 row0.createCell(4).setCellValue("工作年限");
39 row0.getCell(4).setCellStyle(style);
40 
41 User u = new User();
42 u.setName("郭大侠");
43 u.setSex("男");
44 u.setAge("30");
45 u.setJob("Java开发");
46 u.setExperience("2");
47 
48 User u1 = new User();
49 u1.setName("陶大婶");
50 u1.setSex("男");
51 u1.setAge("28");
52 u1.setJob("Java开发");
53 u1.setExperience("3");
54 
55 ArrayList<User> arrayList = new ArrayList<User>();
56 arrayList.add(u);
57 arrayList.add(u1);
58 
59 for(int i=1; i<3; i++){
60 XSSFRow row = sheet.createRow(i);
61 row.createCell(0).setCellValue(arrayList.get(i-1).getName());
62 row.createCell(1).setCellValue(arrayList.get(i-1).getSex());
63 row.createCell(2).setCellValue(arrayList.get(i-1).getAge());
64 row.createCell(3).setCellValue(arrayList.get(i-1).getJob());
65 row.createCell(4).setCellValue(arrayList.get(i-1).getExperience());
66 }
67 
68 try {
69 x.write(new FileOutputStream("E:\\test.xlsx"));
70 } catch (FileNotFoundException e) {
71 e.printStackTrace();
72 } catch (IOException e) {
73 e.printStackTrace();
74 }
75 }
76 
77 public static void main(String[] args) {
78 
79 TestDemo t = new TestDemo();
80 t.createExcel();
81 }
82 }