一. 思路

今天接到个小任务,让把json文件转换成excel文件,按照列展开.

思路:既然json已经都已经是现成的,那直接将json文件做读操作,在通过不同的key,找到对应的信息,在存到单元格中,在写操作,生成excel文档

二.jar包

涉及到的jar包,阿里的fastjson和poi的jar包

三.代码

我的json文档里数据的格式是这样的

[
{
"total": 1,
"name": "规则限制:XXXX",
"timeStr": 1619242800000,
"message": "XXX",
"hehe": ""
},

{
"total": 2,
"name": "服务异常:XXXX",
"timeStr": 1619240400000,
"message": "XXX！",
"hehe": ""
}
]

 1.先对json文件进行读操作,提取String对象,在将String对象转换为JsonArray

public static String readJsonFile(String path) {
String jsonString = "";
try {
File file = new File(path);
FileReader fileReader = new FileReader(file);
Reader reader = new InputStreamReader(new FileInputStream(file),"utf-8");
int ch = 0;
StringBuffer sb = new StringBuffer();
while ((ch = reader.read()) != -1) {
sb.append((char) ch);
}
fileReader.close();
reader.close();
jsonString = sb.toString();
return jsonString;
} catch (Exception e) {
e.printStackT
3ff8
race();
return null;
}
}

我试过直接读文件,出现中文乱码,所以记得用UTF-8编码,否则会是乱码

2.文件内容以String的形式获取到,这时创建excel文件,在将String转换为jsonArray形式遍历,分别插入到excel文件的单元格cell中,在做写操作

public static void main(String[] args) {
String json = ToJson.readJsonFile("C:\\Users\\yu\\Desktop\\new.json");

//System.out.println(json);
//JSONObject object = JSON.parseObject(json);

try {
//生成excel文件存放的地址
String uploadFile = "D:/test.xlsx";
OutputStream excel = new FileOutputStream(uploadFile);
XSSFWorkbook workBook = new XSSFWorkbook();
XSSFSheet sheet = workBook.createSheet();

XSSFRow row = null;//行
XSSFCell cell = null;//单元格

row = sheet.createRow(0);
//这是创建excel上边的标题头
String[] names = { "total", "异常", "页面名称", "信息","时间","工号"};
for (int index = 0; index < 5; index++) {
cell = row.createCell(index);
cell.setCellValue(names[index]);
}
int count = 1;

JSONArray dataArray = JSONArray.parseArray(json);
for(int i = 0; i < dataArray.size();i++){
JSONObject dataObj =  dataArray.getJSONObject(i);
//获取不同key中的值
String total = dataObj.getString("total");
String name = dataObj.getString("name");
String[] nameArray = name.split(":");//这个是通过分号获得两个值,分别写在excel中
String name1 = nameArray[0];
String name2 = nameArray[1];
String timeStr = dataObj.getString("timeStr");
String time = ToJson.stampToTime(timeStr);//这个根据时间戳转换为正常年月日,时分秒
String message = dataObj.getString("message");
String staffId = dataObj.getString("hehe");

row = sheet.createRow(count);
cell = row.createCell(0);
cell.setCellValue(total);

cell = row.createCell(1);
cell.setCellValue(name1);

cell = row.createCell(2);
cell.setCellValue(name2);

cell = row.createCell(3);
cell.setCellValue(message);

cell = row.createCell(4);
cell.setCellValue(time);

cell = row.createCell(5);
cell.setCellValue(staffId);

count++;

}
workBook.write(excel);

} catch (Exception e) {
e.printStackTrace();
}

}

时间戳的转换方法:

public static String  stampToTime(String stamp) {
String sd = "";
Date d = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sd = sdf.format(new Date(Long.parseLong(stamp))); // 时间戳转换日期
return sd;
}

运行即可获得excel文件

全部代码:

package com.china.excelToJson;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;

public class ToJson {

public static void main(String[] args) {
String json = ToJson.readJsonFile("C:\\Users\\yu\\Desktop\\new.json");

//System.out.println(json);
//JSONObject object = JSON.parseObject(json);

try {
//生成excel文件存放的地址
String uploadFile = "D:/test.xlsx";
OutputStream excel = new FileOutputStream(uploadFile);
XSSFWorkbook workBook = new XSSFWorkbook();
XSSFSheet sheet = workBook.createSheet();

XSSFRow row = null;//行
XSSFCell cell = null;//单元格

row = sheet.createRow(0);
//这是创建excel上边的标题头
String[] names = { "total", "异常", "页面名称", "信息","时间","工号"};
for (int index = 0; index < 5; index++) {
cell = row.createCell(index);
cell.setCellValue(names[index]);
}
int count = 1;

JSONArray dataArray = JSONArray.parseArray(json);
for(int i = 0; i < dataArray.size();i++){
JSONObject dataObj =  dataArray.getJSONObject(i);
//获取不同key中的值
String total = dataObj.getString("total");
String name = dataObj.getString("name");
String[] nameArray = name.split(":");//这个是通过分号获得两个值,分别写在excel中
String name1 = nameArray[0];
String name2 = nameArray[1];
String timeStr = dataObj.getString("timeStr");
String time = ToJson.stampToTime(timeStr);//这个根据时间戳转换为正常年月日,时分秒
String message = dataObj.getString("message");
String staffId = dataObj.getString("hehe");

row = sheet.createRow(count);
cell = row.createCell(0);
cell.setCellValue(total);

cell = row.createCell(1);
cell.setCellValue(name1);

cell = row.createCell(2);
cell.setCellValue(name2);

cell = row.createCell(3);
cell.setCellValue(message);

cell = row.createCell(4);
cell.setCellValue(time);

cell = row.createCell(5);
cell.setCellValue(staffId);

count++;

}
workBook.write(excel);

} catch (Exception e) {
e.printStackTrace();
}

}

public static String  stampToTime(String stamp) {
String sd = "";
Date d = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sd = sdf.format(new Date(Long.parseLong(stamp))); // 时间戳转换日期
return sd;
}

public static String readJsonFile(String fileName) {
String jsonStr = "";
try {
File jsonFile = new File(fileName);
FileReader fileReader = new FileReader(jsonFile);
Reader reader = new InputStreamReader(new FileInputStream(jsonFile),"utf-8");
int ch = 0;
StringBuffer sb = new StringBuffer();
while ((ch = reader.read()) != -1) {
sb.append((char) ch);
}
fileReader.close();
reader.close();
jsonStr = sb.toString();
return jsonStr;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}