java file乱码_java读取文件乱码

List lines=new ArrayList();

BufferedReader br = new BufferedReader(new FileReader(fileName));

String line = null;

while ((line = br.readLine()) != null) {

lines.add(line);

}

br.close();

Java的I/O类处理如图：

Reader 类是 Java 的 I/O 中读字符的父类，而 InputStream 类是读字节的父类，InputStreamReader 类就是关联字节到字符的桥梁，它负责在 I/O 过程中处理读取字节到字符的转换，而具体字节到字符的解码实现它由 StreamDecoder 去实现，在 StreamDecoder 解码过程中必须由用户指定 Charset 编码格式。值得注意的是如果你没有指定 Charset，将使用本地环境中的默认字符集，例如在中文环境中将使用 GBK 编码。

总结：Java读取数据流的时候，一定要指定数据流的编码方式，否则将使用本地环境中的默认字符集。

public static List fileinput() {

// TODO Auto-generated method stub

List list = new ArrayList();

try {

String fileName = "C://Users/Administrator/Desktop/备份/bustno.txt";

StringBuffer sb = new StringBuffer("");

InputStreamReader sr = new InputStreamReader(new FileInputStream(fileName),"UTF-8");

BufferedReader br = new BufferedReader(sr);

String str = null;

while ((str = br.readLine()) != null) {

String[] firstSplit = str.split("\n");

int recordNum = firstSplit.length;

for(int i=0; i < recordNum;i++){

String[] one = str.split("\\|");

Organ organ = new Organ();

organ.setParentID(0);

organ.setOrganValue(one[0].substring(0, 3));

organ.setOrganName(one[1]);

list.add(organ);

}

}

br.close();

sr.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.print("read succeeded");

return list;

}

list结果集分组：

private static void fenzu(String filepath) throws IOException, ParseException {

// TODO Auto-generated method stub

SimpleDateFormat simpleDate = new SimpleDateFormat("yyyy-MM");

List valueList = new ArrayList();//将结果集转化为二维数组

StringBuffer sb = new StringBuffer("");

InputStreamReader sr = new InputStreamReader(new FileInputStream(filepath),"UTF-8");

BufferedReader br = new BufferedReader(sr);

String str = null;

List list = new ArrayList();

while ((str = br.readLine()) != null) {

String[] firstSplit = str.split("\n");

int recordNum = firstSplit.length;

for(int i=0; i < recordNum;i++){

String[] one = str.split("\t");

Canal canalone = new Canal();

canalone.setCanal(one[0]);

canalone.setSa_tx_m(one[1]);

canalone.setCr_tx_amt(one[2]);

list.add(canalone);

}}

System.out.print("list size :"+list.size()+ "\n");

//结果集分组

List uniqueList = new ArrayList();//存放Canal个数

for (int j = 0; j < list.size(); j++) {

Canal canal = list.get(j);

if (!uniqueList.contains(canal.getCanal()))

{

System.out.print("uniqueList not contains : " +canal.getCanal().toString() + "\n" );

String[][] b = new String[2][12];//String[0][]为canal,长度为1，String[1][]对应每个月的数值

b[0][0] = canal.getCanal();//canal

String amtValue = list.get(j).getCr_tx_amt();// 金额

Calendar Date = Calendar.getInstance();

Date.setTime(simpleDate.parse(canal.getSa_tx_m()));

int month = Date.get(Calendar.MONTH); // 因为数组的编号要减一，这里不用加一

b[1][month] = amtValue;

uniqueList.add(canal.getCanal());//将canal种类放在集合里

valueList.add(b);//将数值集合放在valueList里

} else {

for (int k = 0; k < valueList.size(); k++) {

String[][] b = valueList.get(k);

if (b[0][0].equals(canal.getCanal())) {

valueList.remove(k);//先remove结果集里不完整的记录

System.out.print("has found canal : " + canal.getCanal() + "\n");

String amtValue = canal.getCr_tx_amt();// 金额

Calendar Date = Calendar.getInstance();

Date.setTime(simpleDate.parse(canal

.getSa_tx_m()));

int month = Date.get(Calendar.MONTH); // 因为数组的编号要减一，这里不用加一

b[1][month] = amtValue.toString();

valueList.add(b);//加了数值再add到分组的list里

break; //找到就返回

}

}

}

}

}