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  • 将List<Map>中的datas转换为json格式写入文件

    private static boolean writeToTextFileByJson(List<Map<String, Object>> datas, String title, String columns,
    			String fileName, String encode) {
    		final BufferedWriter bw;
    		boolean flag = true;
    		try {
    			boolean hasExists = new File(fileName).exists();
    			if(!hasExists){
    			createLocDir(fileName);//创建目录
    			}
    			File f = new File(fileName);
    			bw = new BufferedWriter(new FileWriter(f, false));
    			final String[] allcolumns = columns.substring(0, columns.length()).split(",");
    			Map<String, Object> resultMap = new HashMap<String, Object>();
    			String mobile = "";
    			List<Map<String,Object>> columnList = new ArrayList<Map<String,Object>>();
    			
    			//mobileMap.put("mobile", (String) m.get(allcolumns[0].toUpperCase()));
    					Object value ="";
    					for(Map<String, Object> map : datas) {
    						for (int i = 1; i < allcolumns.length; i++) {
    							String columnName = allcolumns[i];
    						Set<String> set = map.keySet();
    						if(set.contains(columnName)){
    							value =  map.get(columnName);
    						}
    						mobile = (String) map.get(allcolumns[0].toUpperCase());
    						resultMap.put("mobile", mobile);
    						HashMap<String, Object> columnMap = new HashMap<String, Object>();
    						columnMap.put("colum_name", columnName); 
    						columnMap.put("value", value);
    						columnList.add(columnMap);
    					resultMap.put("column", columnList);
    					String json = JsonUtil.toJson(resultMap).toString();
    					bw.write(json);
    					columnList.clear();
    					}
    			}
    			
    			if (bw != null) {
    				bw.close();
    			}
    		} catch (Exception e) {
    			flag = false;
    			LOG.error("createFile(" + fileName + ") error:", e);
    			e.printStackTrace();
    		} 
    		return flag;
    	}
    
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  • 原文地址:https://www.cnblogs.com/yangsy0915/p/4890757.html
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