背景：在政府开发了一个应用系统，主要功能是让企业填写企业资质信息，然后通过给定的公式，统计这一系列的信息，以得分的形式展示给政府领导查看。目前有1300家企业填报。由于得分是实时显示的，所以导致统计功能很慢。

代码运行流程：

1、查出1300企业信息

2、遍历1300企业信息，ji计算每家企业得分信息。每家预计时间为0.3秒。合计390秒。导致页面请求超时

3、导出(用jxl jar)

解决方案：

由于处理业务的，所以需要能有返回值的线程。用：Callable

直接上代码

1、调用线程的代码

List<Map<String,Object>> list = (List<Map<String, Object>>) map.get("rows");int taskSize = 20;// 创建一个线程池ExecutorService pool = Executors.newFixedThreadPool(taskSize);// 创建多个有返回值的任务 List<Future> listFuture = new ArrayList<Future>();for (int i = 0; i < taskSize; i++) { System.out.println("我启用多线程啦啦啦"); int evgCount = list.size()/taskSize; Callable c = new MyCallable(list.subList(evgCount*i, evgCount*(i+1)),session,staticFlag, declareService,declareMasterService,enterpriseQueryService); // 执行任务并获取Future对象 Future f = pool.submit(c); listFuture.add(f);}pool.shutdown();// 获取所有并发任务的运行结果 List<Map<String, Object>> listResult = new ArrayList<Map<String, Object>>();for (Future f : listFuture) { List<Map<String, Object>> listModel = new ArrayList<Map<String, Object>>(); try { listModel = (List<Map<String, Object>>) f.get(); } catch (InterruptedException e) { e.printStackTrace(); } catch (ExecutionException e) { e.printStackTrace(); } listResult.addAll(listModel);}map.put("rows", listResult);

2、线程的代码

package usi.jszx.controller;import java.util.List;import java.util.Map;import java.util.concurrent.Callable;import javax.servlet.http.HttpSession;import org.apache.commons.lang3.StringUtils;import usi.jszx.entity.ScoreMain;import usi.jszx.service.DeclareMasterService;import usi.jszx.service.DeclareService;import usi.jszx.service.EnterpriseQueryService;import usi.sys.dto.AuthInfo;import usi.sys.util.ConstantUtil;class MyCallable implements Callable<Object> { //-----------------以下为线程调用的方法---------------- private List<Map<String,Object>> list; private HttpSession session; private String staticFlag; private DeclareService declareService; private DeclareMasterService declareMasterService; private EnterpriseQueryService enterpriseQueryService; public MyCallable(List<Map<String,Object>> list,HttpSession session,String staticFlag, DeclareService declareService,DeclareMasterService declareMasterService,EnterpriseQueryService enterpriseQueryService) { this.list = list; this.session = session; this.staticFlag = staticFlag; this.declareService = declareService; this.declareMasterService = declareMasterService; this.enterpriseQueryService = enterpriseQueryService; } @Override public Object call() throws Exception { AuthInfo info = (AuthInfo)session.getAttribute(ConstantUtil.AUTH_INFO); for (int i = 0; i < list.size(); i++) { Map<String,Object> maplist = list.get(i); String mainId= maplist.get("ID")+""; this.gradeMaster(session, mainId, maplist.get("orgId")+"",declareMasterService,enterpriseQueryService); List<Map<String,Object>> listscore = declareMasterService.queryScoreMain(maplist.get("ID")+"",info.getRightType(), "report"); // declareMasterService.queryScoreMain(mainId,info.getRightType(),isreport); int isdouble = 1; if(listscore.size()>30){ maplist.put("SOCRETOTAL", listscore.get(46).get("SCORE")); isdouble = 2; } else if(listscore.size()>22){ maplist.put("SOCRETOTAL", listscore.get(23).get("SCORE")); } if("3".equals(staticFlag)){ for (int j = 0; j < 23; j++) { if(j<9){ maplist.put("VALUE0"+(j+1), listscore.get(j*isdouble).get("SHOW_VALUE")); } else{ maplist.put("VALUE"+(j+1), listscore.get(j*isdouble).get("SHOW_VALUE")); } } } //地市展示 String COUNTYID = maplist.get("COUNTYID")+""; if("340826".equals(COUNTYID)||"341822".equals(COUNTYID)){ maplist.put("CITYNAME",maplist.get("COUNTYNAME")+""); } //企业类型 String DECLARE_EVALUATE = maplist.get("DECLARE_EVALUATE")+""; if("1".equals(DECLARE_EVALUATE)){ maplist.put("DECLARE_EVALUATE_NAME","申报"); } else{ maplist.put("DECLARE_EVALUATE_NAME","评价"); } //审核状态 String SHSTATUS = maplist.get("SHSTATUS")+""; if("9".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "草稿"); } else if("0".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "企业提交"); } else if("1".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "市审核通过"); } else if("2".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "市审核不通过"); } else if("3".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "省审核通过"); } else if("4".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "省审核不通过"); } else if("5".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "省级审核中"); } else if("6".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "退回企业修改"); } else if("7".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "市级审核中"); } else if("11".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "修改为申报"); } else if("12".equals(SHSTATUS)){ maplist.put("STRSHSTATUS", "修改为评价"); } if("1".equals(staticFlag)){ //添加修改意见 List<Map<String, Object>> listDetail = declareService.queryAuditLog(mainId); if(listDetail.size()>0){ String AUDIT_OPINION = listDetail.get(0).get("AUDIT_OPINION")+""; if(!StringUtils.isEmpty(AUDIT_OPINION)&&!"null".equals(AUDIT_OPINION)){ maplist.put("AUDIT_OPINION", AUDIT_OPINION); } else{ maplist.put("AUDIT_OPINION", ""); } } //是否更名 曾用名 String ORGNAME = maplist.get("ORGNAME")+""; String PJNAME = maplist.get("PJNAME")+""; if(StringUtils.isEmpty(PJNAME)||"null".equals(PJNAME) ||PJNAME.equals(ORGNAME)){ maplist.put("ISGENGMING", "否"); maplist.put("PJNAME_E", ""); } else{ maplist.put("ISGENGMING", "是"); maplist.put("PJNAME_E", PJNAME); } } else if("2".equals(staticFlag)){ } } return list; } public float gradeMaster(HttpSession session,String mainId,String orgId, DeclareMasterService declareMasterService,EnterpriseQueryService enterpriseQueryService) { AuthInfo info = (AuthInfo)session.getAttribute(ConstantUtil.AUTH_INFO); String rightType=info.getRightType(); declareMasterService.deleteScoreMain(mainId); float[] resultFirst = new float[100]; /** 先查询所有 附表列表* 查看得分的地方，是直接查找主表数据的* * 既然审核了，主表数据肯定存起来了* */ List<Map<String,Object>> listDetail = declareMasterService.queryTaskDetail(mainId); if("2".equals(rightType)||"3".equals(rightType)){ //将String 转为 float for (int i = 0; i < listDetail.size(); i++) { Map<String,Object> map = listDetail.get(i); if(StringUtils.isEmpty(map.get("DECLARE_CITY_VALUE")+"") ||"null".equals(map.get("DECLARE_CITY_VALUE")+"")){ resultFirst[i]=0f; } else{ resultFirst[i] = float.parsefloat(map.get("DECLARE_CITY_VALUE")+""); } } } else{ //将String 转为 float for (int i = 0; i < listDetail.size(); i++) { Map<String,Object> map = listDetail.get(i); if(StringUtils.isEmpty(map.get("DECLARE_PROVINCE_VALUE")+"") ||"null".equals(map.get("DECLARE_PROVINCE_VALUE")+"")){ resultFirst[i]=0f; } else{ resultFirst[i] = float.parsefloat(map.get("DECLARE_PROVINCE_VALUE")+""); } } } Map<String,Object> enterprise= enterpriseQueryService.getInfoByOrgId(orgId).get(0); //根据 安徽省企业技术中心评价指标计算公式 进行算值 下一步算分 float ratio1 = 0f; float ratio2 = 0f; float ratio3 = 0f; try { ratio1 = float.parsefloat(enterprise.get("RATIO1")+""); ratio2 = float.parsefloat(enterprise.get("RATIO2")+""); ratio3 = float.parsefloat(enterprise.get("RATIO3")+""); } catch (Exception e) { } Map<String,Object> map = DeclareController.getValue(resultFirst,ratio1,ratio2,ratio3); float[] resultValue = (float[]) map.get("resultValue"); float[] resultScoreValue = (float[]) map.get("resultScoreValue"); float[] resultScore = DeclareController.getScore(resultScoreValue); float scoreTotal = 0f; List<Map<String,Object>> listScore = declareMasterService.queryScoreDic(); for (int i = 0; i < listScore.size(); i++) { ScoreMain scoreMain = new ScoreMain(); scoreMain.setMainId(mainId); scoreMain.setScoreName(listScore.get(i).get("SCORE_NAME")+""); scoreMain.setScoreUnit(listScore.get(i).get("SCORE_UNIT")+""); scoreMain.setScoreWeight(listScore.get(i).get("SCORE_WEIGHT")+""); scoreMain.setDisOrder(listScore.get(i).get("DIS_ORDER")+""); scoreMain.setShowValue(resultValue[i]+""); scoreMain.setScoreValue(resultScoreValue[i]+""); scoreMain.setScore(resultScore[i]+""); declareMasterService.inserScoreMain(scoreMain); scoreTotal +=resultScore[i]; } return scoreTotal; }}

说明：MyCallable仅仅是业务处理方式繁杂。可忽略，最后从390秒提速致40秒。

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