关于多线程hutool查表存放数据null问题

// 进行分页查询

SmallTool.printMess("数量大于1万分页查询");

//+++++++++++++++++++++++++++++++++++++++++++++

int onePageNum =10000;

int from =1;

int max =0;

List tableNum = Db.use().query("select count(1) as count from " + tableName);

int count = tableNum.get(0).getInt("count");

if (count >0) {

max = Db.use().queryNumber("select max(id) from " + tableName).intValue();

}

int page = max / onePageNum;

if (max % onePageNum !=0) {

page++;

}

List tempNum = Collections.synchronizedList(new ArrayList<>());

List pageInfos =new ArrayList<>();

for (int i =1; i <= page; i++) {

int start = (i -1) * onePageNum + from;

int stop = i * onePageNum + from -1;

if (stop > max) {

stop = max + onePageNum;

}

pageInfos.add(new PageInfo(start, stop));

}

List finalRes = Collections.synchronizedList(new ArrayList<>(10000000));

int finalPage = page;

pageInfos.parallelStream().forEach(pg -> {

List tableData =null;

tempNum.add(pg.getFrom());

SmallTool.printMess(" 现在开始： " + pg.getFrom() +" -- " + pg.getTo() +" 总条数： " +finalPage +" 目前已处理： " +tempNum.size() +" 表名： " +tableName);

try {

tableData = Db.use().query("select * from " +tableName +" where id  between " + pg.getFrom() +" and " + pg.getTo());

}catch (SQLException throwables) {

throwables.printStackTrace();

}

finalRes.addAll(tableData);

});

res = finalRes;

多线程查表 存放数据  list 必须是 线程安全的 用synchronizedList 进行存放