java多线程向数据库中加载数据

读取本地文件，每行为一条记录，文件大小550M，200万条数据。先将文件读取的内存中，再开启6个线程连接postgresql不同coordinator端口导入数据。代码如下：

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;


public class InsertThread implements Runnable {


public static void main(String[] args) {
// String file = "f://weibo.200w"; 
// String tb = "tb2";
// String ip = "102";
String file = args[0];
String tb = args[1];
String ip = args[2];
String[] port = { "2341", "2342", "2343", "2344", "2345", "2346" };
List list = null;
try {
// 获得源数据
list = getContent(file);
System.out.println(list.size());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


InsertThread myThread1 = new InsertThread();
myThread1.setPramater(tb, ip, port[0], list);
Thread thread1 = new Thread(myThread1);


InsertThread myThread2 = new InsertThread();
myThread2.setPramater(tb, ip, port[1], list);
Thread thread2 = new Thread(myThread2);


InsertThread myThread3 = new InsertThread();
myThread3.setPramater(tb, ip, port[2], list);
Thread thread3 = new Thread(myThread3);


InsertThread myThread4 = new InsertThread();
myThread4.setPramater(tb, ip, port[3], list);
Thread thread4 = new Thread(myThread4);


InsertThread myThread5 = new InsertThread();
myThread5.setPramater(tb, ip, port[4], list);
Thread thread5 = new Thread(myThread5);


InsertThread myThread6 = new InsertThread();
myThread6.setPramater(tb, ip, port[5], list);
Thread thread6 = new Thread(myThread6);


thread1.start();
thread2.start();
thread3.start();
thread4.start();
thread5.start();
thread6.start();
}


private String tb;
private String ip;
private String port;
private List list;


public void setPramater(String tb, String ip, String port, List list) {
this.tb = tb;
this.ip = ip;
this.port = port;
this.list = list;
}


public void run() {
PreparedStatement ps = null;
String sql = null;
Connection conn = null;


try {
Class.forName("org.postgresql.Driver");
String url = "jdbc:postgresql://192.168.8." + ip + ":" + port
+ "/postgres";
try {
conn = DriverManager.getConnection(url, "postgres", "postgres");
} catch (SQLException e) {
e.printStackTrace();
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
int count = 0;
try {
conn.setAutoCommit(false);
sql = "insert into "
+ tb
+ " values(?,?,?,?,?,?,?::timestamptz,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
ps = conn.prepareStatement(sql);
} catch (SQLException e) {
e.printStackTrace();
}
Long beginTime = System.currentTimeMillis();
Long begin = System.currentTimeMillis();


for (int i = 0; i < list.size(); i++) {
String[] con = list.get(i).split(",", -1);
if (con.length != 38) {
continue;
}
count++;
try {
for (int j = 0; j < con.length; j++) {
if (con[j] == null) {
ps.setString(j + 1, "NULL");
} else {
ps.setString(j + 1, con[j].trim());
}
}
ps.addBatch();
if (count > 0 && count % 10000 == 0) {// 可以设置不同的大小;如50，100，500，1000等等
ps.executeBatch();
conn.commit();
ps.clearBatch();
Long midTime = System.currentTimeMillis();
System.out.println("-----------------" + count);
System.out.println("导入1万条数据性能" + (10000 * 1000)
/ (midTime - begin));
begin = midTime;
}
} catch (SQLException e) {
e.printStackTrace();
continue;
}
}
try {
ps.executeBatch();
conn.commit();
ps.clearBatch();
} catch (SQLException e) {
e.printStackTrace();
}


long sum = 1000 * count;
long endTime = System.currentTimeMillis();


System.out.println("pst+batch：" + count + "条");
System.out.println("pst+batch：" + (endTime - beginTime) / 1000 + "秒");
System.out.println("pst+batch：" + sum / (endTime - beginTime) + "条/秒");


if (ps != null) {
try {
ps.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}


public static List getContent(String file) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream(file), "UTF-8"));
String line = br.readLine();
List list = new ArrayList();
while (line != null) {
list.add(line);
line = br.readLine();
}
br.close();
return list;
}
}