基于Java实现Json文件转换为Excel文件
作者：菜鸟小于
这篇文章主要为大家详细介绍了如何利用Java实现Json文件转换为Excel文件，文中的示例代码讲解详细，具有一定的借鉴价值，需要的可以参考一下
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.printStackTrace();
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;
}
}
}到此这篇关于基于Java实现Json文件转换为Excel文件的文章就介绍到这了,更多相关Java Json转Excel内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！