全栈工程师开发手册 （作者：栾鹏）
java教程全解
java将数据写入csv文件，从csv文件中读取数据
测试代码
public static void main(String[] arges){//自定义数组ArrayList<ArrayList<String>> alldata=new ArrayList<ArrayList<String>>();alldata.add(new ArrayList<String>(Arrays.asList("1","11","111"))); //添加一行alldata.add(new ArrayList<String>(Arrays.asList("2","22","222"))); //添加一行alldata.add(new ArrayList<String>(Arrays.asList("3","33","333"))); //添加一行//保存成csv文件Array2CSV(alldata,"test.csv");//读取csv文件ArrayList<ArrayList<String>> alldata1=CSV2Array("test.csv");//遍历数组for (ArrayList<String> arrayList : alldata1) {for (String string : arrayList) {System.out.println(string);}}}
将数据写入csv文件
//导出到csv文件public static void Array2CSV(ArrayList<ArrayList<String>> data, String path){try {BufferedWriter out =new BufferedWriter(new OutputStreamWriter(new FileOutputStream(path),"UTF-8"));for (int i = 0; i < data.size(); i++){ArrayList<String> onerow=data.get(i);for (int j = 0; j < onerow.size(); j++){out.write(DelQuota(onerow.get(j)));out.write(",");}out.newLine();}out.flush();out.close();} catch (Exception e) {e.printStackTrace();}}public static String DelQuota(String str){String result = str;String[] strQuota = { "~", "!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "`", ";", "'", ",", ".", "/", ":", "/,", "<", ">", "?" };for (int i = 0; i < strQuota.length; i++){if (result.indexOf(strQuota[i]) > -1)result = result.replace(strQuota[i], "");}return result;}
从csv文件中读取数据
public static ArrayList<ArrayList<String>> CSV2Array(String path){try {BufferedReader in =new BufferedReader(new InputStreamReader(new FileInputStream(path),"UTF-8"));ArrayList<ArrayList<String>> alldata=new ArrayList<ArrayList<String>>();String line;String[] onerow;while ((line=in.readLine())!=null) {onerow = line.split(","); //默认分割符为逗号，可以不使用逗号List<String> onerowlist = Arrays.asList(onerow);ArrayList<String> onerowaArrayList = new ArrayList<String>(onerowlist);alldata.add(onerowaArrayList);}in.close();return alldata;} catch (Exception e) {return null;}}
