java里测试时间代码

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long start=System.currentTimeMillis();//获取最初时间　

createBatch(); //测试的代码段，通常可以将主要算法封装在这里

long end=System.currentTimeMillis();//获取运行结束时间　　

System.out.println("程序运行时间："+(end-start)+"ms");

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long start = System.currentTimeMillis();
  createBatch();
  long end = System.currentTimeMillis();
  System.out.println("程序所用时间：" + (end - start) + "ms");

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以运行1000次为例子：

程序所用时间：26601ms
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源代码如下：

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package cn.itcase.jdbc2;

import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class BatchTest {

/**
* 批处理
* @param args
* @throws SQLException
*/
public static void main(String[] args) throws SQLException {
  long start = System.currentTimeMillis();
  createBatch();
  long end = System.currentTimeMillis();
  System.out.println("程序所用时间：" + (end - start) + "ms");

}

static void create(int i) throws SQLException {
  Connection conn = null;
  PreparedStatement ps = null;
  ResultSet rs = null;
  try {
   conn = JdbcUtils.getConnection();
   String sql = "insert into user(name,birthday,money) values (?,?,?)";
   ps = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);//设置主键
   ps.setString(1, "batch name" + i);
   ps.setDate(2, new Date(System.currentTimeMillis()));
   ps.setFloat(3, 100f + i);

   ps.executeUpdate();
  } finally {
   JdbcUtils.free(rs, ps, conn);
  }
}

static void createBatch() throws SQLException {
  Connection conn = null;
  PreparedStatement ps = null;
  ResultSet rs = null;
  try {
   conn = JdbcUtils.getConnection();
   String sql = "insert into user(name,birthday,money) values (?,?,?)";
   ps = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);//设置主键
   for(int i = 0; i < 10; i++){
   ps.setString(1, "batch name" + i);
   ps.setDate(2, new Date(System.currentTimeMillis()));
   ps.setFloat(3, 100f + i);

   ps.addBatch();
   }

   int[] is = ps.executeBatch();
  } finally {
   JdbcUtils.free(rs, ps, conn);
  }
}

}