按订单号（String常量池唯一，即对象唯一）加同步锁

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package com.mmhlive.bdp.service;public class TestLock implements Runnable{public static void main(String[] args) {TestLock tl1=new TestLock("th1");TestLock tl2=new TestLock("th2");new Thread(tl1).start();new Thread(tl2).start();}public TestLock(String name) { this.name=name;}private String name;@Overridepublic void run() {  synchronized ("orderId") {System.out.println(name);try {Thread.sleep(10000000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

输出：th1

package com.mmhlive.bdp.service;public class TestLock implements Runnable{public static void main(String[] args) {TestLock tl1=new TestLock("th1");TestLock tl2=new TestLock("th2");new Thread(tl1).start();new Thread(tl2).start();}public TestLock(String name) { this.name=name;}private String name;@Overridepublic void run() { Object obj=new Object();// synchronized ("orderId") { synchronized (new String("orderId")) {System.out.println(name);try {Thread.sleep(10000000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

输出：

th1
th2

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