java读取文件内容,解析Json格式数据
一、读取txt文件内容(Json格式数据)
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public static String reader(String filePath) { try { File file = new File(filePath); if (file.isFile() && file.exists()) { InputStreamReader read = new InputStreamReader(new FileInputStream(file), "UTF-8"); BufferedReader bufferedReader = new BufferedReader(read); String lineTxt = bufferedReader.readLine(); while (lineTxt != null) { return lineTxt; } } } catch (UnsupportedEncodingException | FileNotFoundException e) { System.out.println("Cannot find the file specified!"); e.printStackTrace(); } catch (IOException e) { System.out.println("Error reading file content!"); e.printStackTrace(); } return null;} |
二、解析处理Json格式数据
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private static void process(String txtStr) { JSONObject json = JSONObject.fromObject(txtStr); JSONArray datas = json.getJSONObject("data").getJSONArray("rows"); List<Map<String, Object>> list = new ArrayList<>(); for (int i = 0; i < datas.length(); i++) { Map<String, Object> map = new HashMap<>(); JSONObject obj = datas.getJSONObject(i).getJSONObject("cells"); String name = obj.getString("weibo_name"); String code = obj.getString("weibo_id"); String url = BASE_URL + obj.getString("url"); map.put("name", name); map.put("code", code); map.put("url", url); list.add(map); } if (!list.isEmpty()) { insert(list); }} |
三、结果存入数据库
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private static void insert(List<Map<String, Object>> list) { for (Map<String, Object> map : list) { //遍历数据，写存储方法 }} |
四、测试
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public static void main(String[] args) { String filePath = "E:\\wugang\\data\\weiboyi\\wechat.txt"; String txtStr = reader(filePath); if (txtStr != null) { process(txtStr); } else { System.out.println("Read the content is empty!"); } System.out.println("--- end ---");} |
java 读取txt文件中的json数据，进行导出
txt文件中的内容如下
以下代码可直接运行
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package com.hwt.count.test;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.List;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFCellStyle;import org.apache.poi.hssf.usermodel.HSSFFont;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.hssf.util.CellRangeAddress;import org.apache.poi.hssf.util.HSSFColor;import net.sf.json.JSONObject;public class Testaa { public static void main(String[] args) { try { String path = "C:/Users/dell/Desktop/test.txt"; File file = new File(path); InputStreamReader isr = new InputStreamReader(new FileInputStream(file),"GBK"); BufferedReader br = new BufferedReader(isr); String content = br.readLine() ; br.close(); isr.close(); content = content.substring(2, content.length()-2); content = content.replace("},{", ";"); String[] arrContent = content.split(";"); //设置列头名称和表体数据 String[] rowsName = new String[]{"code_type","code","name"}; List<Object[]> dataList = new ArrayList<Object[]>(); for(String arrc : arrContent){ JSONObject jsonObj = JSONObject.fromObject("{"+arrc+"}"); String code = jsonObj.getString("code"); String name = jsonObj.getString("name"); Object[] obj = new Object[rowsName.length]; obj[0] = "TYPE"; obj[1] = code; obj[2] = name; dataList.add(obj); } //设置列头名称和表体数据 HSSFWorkbook workbook = setWorkBookDate(dataList,rowsName); try { // 将workbook对象输出到文件test.xls FileOutputStream fos = new FileOutputStream("C:/Users/dell/Desktop/test.xls"); workbook.write(fos); fos.flush(); // 缓冲 fos.close(); // 关闭流 }catch (Exception e1) { e1.printStackTrace(); } } catch (Exception e) { e.printStackTrace(); } } private static HSSFWorkbook setWorkBookDate(List<Object[]> dataList,String[] rowsName){ //创建工作簿对象 HSSFWorkbook workbook = new HSSFWorkbook(); //创建工作表，设置当前页名称 HSSFSheet sheet = workbook.createSheet("测试"); //设置默认行高 sheet.setDefaultRowHeight((short)350); //合并表头表尾的单元格 /*sheet.addMergedRegion(new CellRangeAddress(0, 2, 0, 3)); sheet.addMergedRegion(new CellRangeAddress(3, 3, 0, 3)); //冻结行 workbook.getSheetAt(0).createFreezePane(0, 4); RegionUtil.setBorderBottom(1, new CellRangeAddress(3, 3, 0, 3), workbook.getSheetAt(0), workbook);//设置边框*/ // 获取表头样式对象 // 获取表体样式对象 HSSFCellStyle style = getCommonStyle(workbook); // 定义所需列数 int columnNum = rowsName.length; //创建列头 HSSFRow rowHead = sheet.createRow(0); for(int n = 0;n < columnNum;n++){ HSSFCell cellRow = rowHead.createCell(n,HSSFCell.CELL_TYPE_STRING);//创建列头对应个数的单元格 cellRow.setCellValue(rowsName[n]);//设置列头单元格的值 cellRow.setCellStyle(style);//设置列头单元格样式 } //将查询出的数据设置到sheet对应的单元格中 for(int i=0;i<dataList.size();i++){ Object[] obj =new Object[dataList.get(i).length]; obj[0] = dataList.get(i)[0]; obj[1] = dataList.get(i)[1]; obj[2] = dataList.get(i)[2]; HSSFRow row = sheet.createRow(i+1);//创建所需的行数 for(int j = 0; j < obj.length; j++){ HSSFCell cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING);//设置单元格的数据类型 if(!"".equals(obj[j]) && obj[j] != null){ cell.setCellValue(obj[j].toString());//设置单元格的值 }else{ cell.setCellValue("");//设置单元格的值为空字符串 } cell.setCellStyle(style);//设置单元格样式 } } //让列宽随着导出的列长自动适应 for (int colNum = 0; colNum < columnNum; colNum++) { int columnWidth = sheet.getColumnWidth(colNum) / 256; for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) { HSSFRow currentRow; //当前行未被使用过 if (sheet.getRow(rowNum) == null) { currentRow = sheet.createRow(rowNum); } else { currentRow = sheet.getRow(rowNum); } if (currentRow.getCell(colNum) != null) { HSSFCell currentCell = currentRow.getCell(colNum); if(currentCell != null && !"".equals(currentCell)){ if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) { int length = currentCell.getStringCellValue().getBytes().length; if (columnWidth < length) { columnWidth = length; } } } } } if(colNum == 0){ //设置表体第一列的宽度 sheet.setColumnWidth(colNum, (columnWidth+4) * 400); }else{ //设置表体其他列的宽度 sheet.setColumnWidth(colNum, (columnWidth+4) * 400); } } return workbook; } public static HSSFCellStyle getCommonStyle(HSSFWorkbook workbook) { // 设置字体 HSSFFont font = workbook.createFont(); //设置字体大小 font.setFontHeightInPoints((short)11); //字体加粗 //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //设置字体名字 font.setFontName("Courier New"); //设置样式; HSSFCellStyle style = workbook.createCellStyle(); //设置底边框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //设置底边框颜色; style.setBottomBorderColor(HSSFColor.BLACK.index); //设置左边框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); //设置左边框颜色; style.setLeftBorderColor(HSSFColor.BLACK.index); //设置右边框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); //设置右边框颜色; style.setRightBorderColor(HSSFColor.BLACK.index); //设置顶边框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); //设置顶边框颜色; style.setTopBorderColor(HSSFColor.BLACK.index); //在样式用应用设置的字体; style.setFont(font); //设置自动换行; style.setWrapText(false); //设置水平对齐的样式为居中对齐; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //设置垂直对齐的样式为居中对齐; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; }} |
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/u011389474/article/details/52700443
