java 线程的 run() 没有返回值，怎么办？

来源：互联网发布：软件企业人才需求编辑：程序博客网时间：2024/06/02 04:13

项目需求

用线程 Thread 执行一些方法后, 需要判断执行是否成功

public void run() {}

run( ) 方法返回值是空, 怎么办?

解决方法

Note

使用 call() 方法

Callable接口是 jdk 5 后新增的接口

代码

package com.example.thread;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.concurrent.Callable;import android.util.Log;import com.example.StreamTool.StreamTool;public class MyThread1 implements Callable<String>  {    private static final String tag = "xxxyyy";    private String phone;    private String name;    public MyThread1(String name, String phone) {        this.name = name;        this.phone = phone;    } //  public MyThread1(String name, String phone) {//      super(name);//      this.phone = phone;//    } //    public void run() {//      Log.i(tag, Thread.currentThread().getName() + "......start");//      String newpath = "http://www.dianping.com/ajax/json/account/reg/mobile/send?m=" + phone + "&flow=t&callback=DP._JSONPRequest._5";//      StringBuilder strBui = new StringBuilder(newpath);////      try {//          URL url = new URL(strBui.toString());//          HttpURLConnection con = (HttpURLConnection) url.openConnection();//          con.addRequestProperty("Content-Type", "text/html; charset=UTF-8");//          con.addRequestProperty(//                         "User-Agent",//                         "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36");//          con.addRequestProperty("Cookie", "_hc.v=\"\\\"0ffcdf91-a4d6-4b08-8800-3d59d2e2fe45.1413899372\\\"\"; abtest=\"48,124\\|52,133\\|47,122\\|44,106\\|45,115\"; __utma=1.29319792.1412090870.1413609669.1413645970.5; __utmz=1.1413645970.5.2.utmcsr=t.dianping.com|utmccn=(referral)|utmcmd=referral|utmcct=/xian; _tr.u=7dhY0yFhd9rY065F; tc=17; cy=17; cye=xian; t_rct=2172824|2171729|6457678; PHOENIX_ID=0a01743f-1492e1321c8-46e6a; 13.t=17deda7d2a7d8e46d84bf12a74627b72; 13.ts=cd3bd6495620e2a204912c4bdfd43220; thirdtoken=891671FC6B450418DD6E0611A3E4CF48; _hc.v=\"\\\"1bdad871-405e-46e3-97d6-46571ad48e14.1413897928\\\"\"; _tr.s=Zy1Ca2OAe1ptv06o; JSESSIONID=891671FC6B450418DD6E0611A3E4CF48");//          con.addRequestProperty("Referer", "http://t.dianping.com/register");//          con.setConnectTimeout(5000);//          con.setRequestMethod("GET");//          //          if (con.getResponseCode() == 200){//              InputStream inputStr = con.getInputStream();//              String info = new String(StreamTool.read(inputStr), "UTF-8");//              Log.i(tag, Thread.currentThread().getName() + info);//          }//      } catch (MalformedURLException e) {//          // TODO Auto-generated catch block//          e.printStackTrace();//      } catch (IOException e) {//          // TODO Auto-generated catch block//          e.printStackTrace();//      } catch (Exception e) {//          // TODO Auto-generated catch block//          e.printStackTrace();//      }//      //        //    }    @Override    public String call() throws Exception {            Log.i(tag, Thread.currentThread().getName() + "......start");            String newpath = "http://www.dianping.com/ajax/json/account/reg/mobile/send?m=" + phone + "&flow=t&callback=DP._JSONPRequest._5";            StringBuilder strBui = new StringBuilder(newpath);            try {                URL url = new URL(strBui.toString());                HttpURLConnection con = (HttpURLConnection) url.openConnection();                con.addRequestProperty("Content-Type", "text/html; charset=UTF-8");                con.addRequestProperty(                               "User-Agent",                               "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36");                con.addRequestProperty("Cookie", "_hc.v=\"\\\"0ffcdf91-a4d6-4b08-8800-3d59d2e2fe45.1413899372\\\"\"; abtest=\"48,124\\|52,133\\|47,122\\|44,106\\|45,115\"; __utma=1.29319792.1412090870.1413609669.1413645970.5; __utmz=1.1413645970.5.2.utmcsr=t.dianping.com|utmccn=(referral)|utmcmd=referral|utmcct=/xian; _tr.u=7dhY0yFhd9rY065F; tc=17; cy=17; cye=xian; t_rct=2172824|2171729|6457678; PHOENIX_ID=0a01743f-1492e1321c8-46e6a; 13.t=17deda7d2a7d8e46d84bf12a74627b72; 13.ts=cd3bd6495620e2a204912c4bdfd43220; thirdtoken=891671FC6B450418DD6E0611A3E4CF48; _hc.v=\"\\\"1bdad871-405e-46e3-97d6-46571ad48e14.1413897928\\\"\"; _tr.s=Zy1Ca2OAe1ptv06o; JSESSIONID=891671FC6B450418DD6E0611A3E4CF48");                con.addRequestProperty("Referer", "http://t.dianping.com/register");                con.setConnectTimeout(5000);                con.setRequestMethod("GET");                float x = 3.4f;                if (con.getResponseCode() == 200){                    InputStream inputStr = con.getInputStream();                    String info = new String(StreamTool.read(inputStr), "UTF-8");                    Log.i(tag, Thread.currentThread().getName() + info);                    if(info.contains("200"))                        return "200";                }            } catch (MalformedURLException e) {                // TODO Auto-generated catch block                e.printStackTrace();            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            } catch (Exception e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        // TODO Auto-generated method stub        return "404";    } }

处理返回值

ExecutorService exec = Executors.newCachedThreadPool();ArrayList<Future<String>> results = new ArrayList<Future<String>>();for(int i = 0; i < num; i++)    results.add(exec.submit(selectThread(telnumber)));for (Future<String> fs:results)    try {        if (fs.get().equals("200"))            success++;    } catch (InterruptedException e) {        // TODO Auto-generated catch block        e.printStackTrace();    } catch (ExecutionException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }return success;

0 0