13COM.NET

第一种情况，Service类：

@Async
public String test1() {
    String threadName = Thread.currentThread().getName();
    log.error("{}: 1 start", threadName);
    try {
        Thread.sleep(5000L);
    } catch (Exception e){
    }
    log.error("{}: 1 end", threadName);
    return "s1";
}

@Async
public String test2() {
    String threadName = Thread.currentThread().getName();
    log.error("{}: 2 start", threadName);
    try {
        Thread.sleep(2000L);
    } catch (Exception e){
    }
    log.error("{}: 2 end", threadName);
    return "s2";
}

Controller类：

try {
    String threadName = Thread.currentThread().getName();
    log.error("{}: 0 start", threadName);
    PrintWriter out = response.getWriter();
    String f1 = testService.test1();