Java的一个问题？

Question

我的一个实现类是如下：
package com.anhuily.callcenter.gps.deviceinfo;import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import com.cms.db.dao.NoSuchColumnException;
import com.cms.db.dao.Row;
import com.cms.db.dao.SQLCommandBean;
import com.cms.db.dao.UnsupportedTypeException;/**
 * <p>
 * Title: EMSFLOW流程管理平台
 * </p>
 * <p>
 * Description: 此代码由EMSFLOW代码生成工具产生
 * </p>
 *  
 * <p>
 * EMSFLOW SoftWare:www.emsflow.com
 * </p>
 * 
 * 
 *    用来处理数据库访问
 */public class DeviceinfoBZ {
private int totalRow; public int getTotalRow() {
return totalRow;
} public List<DeviceInfo> findgpsbyzrrmc(String zrr, String condition,String tablename,
int offset, int limit) {
String sql = "select g.no,c.zrrmc,t.carnum,t.snno,t.simid,realtime,map_x,map_y,acc,wjdy from t_gps_position_"
+ tablename
+ " g  "
+ "inner join (select no,snno,simid,carnum,carid from T_GPS_CAR_SIMID_CONFIG) t on t.no=g.carid  "
+ "inner join (select zrrmc,clid,no from V_SYS_CAR where zrr='"
+ zrr
+ "') c on c.no=t.carid "
+ "where "+condition
+ " order by realtime";
List<DeviceInfo> listinfo = new ArrayList<DeviceInfo>(); SQLCommandBean sBean = new SQLCommandBean("GPS");
Collection c = null;
DeviceInfo dInfo = null;
int intTemp = 0;
int i = 1;
try {
String sqlString = "select count(1) from sysobjects where id = object_id('t_gps_position_"
+ tablename + "') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
sBean.setSqlValue(sqlString);
Collection collection = sBean.executeQuery();
Iterator iterator = collection.iterator();
if (iterator.hasNext()) {
Row row = (Row) iterator.next(); if (!"0".equals(row.getString(1))
&& !"".equals(row.getString(1))) {
sBean.setSqlValue(sql);
c = sBean.executeQuery(offset, limit);
this.setTotalRow(sBean.getTotalRow());
Iterator iter = c.iterator();
while (iter.hasNext()) {
row = (Row) iter.next();
dInfo = new DeviceInfo();
dInfo.setId(row.getString(1));
dInfo.setZrrmc(row.getString(2));
dInfo.setCarnum(row.getString(3));
dInfo.setSnno(row.getString(4));
dInfo.setSimid(row.getString(5));
dInfo.setRealtime(row.getString(6));
dInfo.setMap_x(row.getString(7));
dInfo.setMap_y(row.getString(8));
dInfo.setAcc(row.getString(9));
dInfo.setWjdy(row.getString(10)); if (offset != 0) {
intTemp = ((limit * offset) / limit);
}
dInfo.setId(String.valueOf(i + intTemp));
i++; listinfo.add(dInfo);
}
} } } catch (SQLException e) {
e.printStackTrace();
} catch (UnsupportedTypeException e) {
e.printStackTrace();
} catch (NoSuchColumnException e) {
e.printStackTrace();
} finally {
c = null;
sBean = null;
}
return listinfo;
}
 /**
  * 导成excel表查询
  * **/
public List<DeviceInfo> expgpsbyzrrmc(String zrr, String condition,String tablename) { 
String sql = "select g.no,c.zrrmc,t.carnum,t.snno,t.simid,realtime,map_x,map_y,acc,wjdy from t_gps_position_"
+ tablename
+ " g  "
+ "inner join (select no,snno,simid,carnum,carid from T_GPS_CAR_SIMID_CONFIG) t on t.no=g.carid  "
+ "inner join (select zrrmc,clid,no from V_SYS_CAR where zrr='"
+ zrr
+ "') c on c.no=t.carid "
+ "where "+condition
+ "order by realtime"; 
List<DeviceInfo> listinfo = new ArrayList<DeviceInfo>(); 
SQLCommandBean sBean = new SQLCommandBean("GPS"); 
Collection c = null;
DeviceInfo dInfo = null; 
try {
String sqlString = "select count(1) from sysobjects where id = object_id('t_gps_position_"
+ tablename + "') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
sBean.setSqlValue(sqlString);
Collection collection = sBean.executeQuery();
Iterator iterator = collection.iterator();
if (iterator.hasNext()) {
Row row = (Row) iterator.next(); 
if (!"0".equals(row.getString(1))
&& !"".equals(row.getString(1))) {
sBean.setSqlValue(sql);
c = sBean.executeQuery();
this.setTotalRow(sBean.getTotalRow());
Iterator iter = c.iterator();
while (iter.hasNext()) {
row = (Row) iter.next();
dInfo = new DeviceInfo();
dInfo.setId(row.getString(1));
dInfo.setZrrmc(row.getString(2));
dInfo.setCarnum(row.getString(3));
dInfo.setSnno(row.getString(4));
dInfo.setSimid(row.getString(5));
dInfo.setRealtime(row.getString(6));
dInfo.setMap_x(row.getString(7));
dInfo.setMap_y(row.getString(8));
dInfo.setAcc(row.getString(9));
dInfo.setWjdy(row.getString(10));
listinfo.add(dInfo);
}
} 
} 
} catch (SQLException e) {
e.printStackTrace();
} catch (UnsupportedTypeException e) {
e.printStackTrace();
} catch (NoSuchColumnException e) {
e.printStackTrace();
} finally {
c = null;
sBean = null;
} 
return listinfo; 
} 
public void setTotalRow(int totalRow) {
this.totalRow = totalRow;
}}

Answer 1

action如下：
package com.anhuily.callcenter.gps.deviceinfo;import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.VerticalAlignment;
import jxl.write.Label;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;import com.anhuily.callcenter.fuwu.common.DateUtils;
import com.cms.action.BaseAction;
import com.cms.common.Pager;
import com.cms.common.exception.BusinessException;
import com.cms.common.exception.SystemException;public class DeviceinfoAction extends BaseAction {
private static int PAGE_LENGTH = 30; @Override
public ActionForward executeAction(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws BusinessException, SystemException, ServletException,
IOException {
ActionForward aForward = null;
String amapping = mapping.getParameter();
if ("".equalsIgnoreCase(amapping)) {
aForward = mapping.findForward("failure");
} else if ("devicelist".equalsIgnoreCase(amapping)) {
aForward = deviceList(mapping, form, request, response);
} else if ("exportexcel".equalsIgnoreCase(amapping)) {
exportexcel(mapping, form, request, response);
}
return aForward;
} public ActionForward deviceList(ActionMapping mapping, ActionForm form2,
HttpServletRequest request, HttpServletResponse response) {
String date = request.getParameter("dplanDate");
String firsttime = request.getParameter("dplanDateQuriy2");
String endtime = request.getParameter("dplanDateQuriy22");
String zrr = request.getParameter("yid");
if (date == null || "".equals(date)) {
date = DateUtils.toady();
}
if (firsttime == null || "".equals(firsttime)) {
firsttime = "00:00:00";
}
if (endtime == null || "".equals(endtime)) {
endtime = "01:00:00";
}
DeviceinfoBZ dinfoBZ = new DeviceinfoBZ();
String url = request.getContextPath() + request.getServletPath();
int offset;
int length = PAGE_LENGTH;
String pageOffset = request.getParameter("pager.offset");
if (pageOffset == null || pageOffset.equals("")) {
offset = 0;
} else {
offset = Integer.parseInt(pageOffset);
} String condition = " realtime>='"+date + " "+firsttime+"' and realtime<='" +date+ " "+endtime+"' ";
String tablename = date.substring(0, 4) + "_"+ date.substring(4, 6) + "_" + date.substring(6, 8); List<DeviceInfo> list = dinfoBZ.findgpsbyzrrmc(zrr, condition,tablename, offset,
length);
String pagerHeader = Pager.generate(offset, dinfoBZ.getTotalRow(),
length, url + "?yid=" + zrr + "&dplanDate=" + date
+ "&dplanDateQuriy2=" + firsttime
+ "&dplanDateQuriy22=" + endtime + "", condition);
request.setAttribute("offset", new Integer(0));
request.setAttribute("pagerHeader", pagerHeader);
request.setAttribute("length", new Integer(length));
request.setAttribute("list", list); request.setAttribute("yid", zrr); 
request.setAttribute("date", date);
request.setAttribute("firsttime", firsttime);
request.setAttribute("endtime", endtime);
return mapping.findForward("success"); 
}
/**
 *  导成excel表
 * **/
public void exportexcel(ActionMapping mapping, ActionForm form2,
HttpServletRequest request, HttpServletResponse response) {
String date = request.getParameter("dplanDate");
String firsttime = request.getParameter("dplanDateQuriy2");
String endtime = request.getParameter("dplanDateQuriy22"); 

String zrr = request.getParameter("yid");
if (date == null || "".equals(date)) {
date = DateUtils.toady();
}
if (firsttime == null || "".equals(firsttime)) {
firsttime = "00:00:00";
}
if (endtime == null || "".equals(endtime)) {
endtime = "01:00:00";
} 
DeviceinfoBZ dinfoBZ = new DeviceinfoBZ();  
String condition = " realtime>='"+date + " "+firsttime+"' and realtime<='" +date+ " "+endtime+"' ";
String tablename = date.substring(0, 4) + "_"+ date.substring(4, 6) + "_" + date.substring(6, 8); 
File file = null,file1 = null;
try {
//操作excel
String rootPath = this.getServlet().getServletContext()
.getRealPath("/");
file = new File(rootPath + "\\download\\gpsdevice.xls");
file1 = new File(rootPath + "\\download\\gpsdevice1.xls");
Workbook wb = Workbook.getWorkbook(file);
WritableWorkbook wwb = Workbook.createWorkbook(file1, wb);
WritableSheet sheet = wwb.getSheet(0);
WritableFont titleFont2 = new WritableFont(WritableFont.ARIAL, 10,
WritableFont.NO_BOLD, false);
WritableCellFormat cTitleFont2 = new WritableCellFormat(titleFont2); jxl.write.NumberFormat nf1 = new jxl.write.NumberFormat("###,###");
WritableCellFormat wcf_n = new WritableCellFormat(nf1);
wcf_n.setAlignment(Alignment.CENTRE);
wcf_n.setVerticalAlignment(VerticalAlignment.CENTRE); List<DeviceInfo> l = dinfoBZ.expgpsbyzrrmc(zrr, condition,tablename);
for (int i = 0; i < l.size(); i++) { DeviceInfo d = (DeviceInfo) l.get(i);
sheet.addCell(new jxl.write.Number(0, i + 2, (i + 1), wcf_n));
// sheet.addCell(new Label(0,i+2,d.getId(),cTitleFont2));                  
sheet.addCell(new Label(1, i + 2, d.getZrrmc(), cTitleFont2));
sheet.addCell(new Label(2, i + 2, d.getCarnum(), cTitleFont2));
sheet.addCell(new Label(3, i + 2, d.getSnno(), cTitleFont2));
sheet.addCell(new Label(4, i + 2, d.getSimid(), cTitleFont2));
sheet
.addCell(new Label(5, i + 2, d.getRealtime(),
cTitleFont2));
sheet.addCell(new Label(6, i + 2, d.getMap_x(), cTitleFont2));
sheet.addCell(new Label(7, i + 2, d.getMap_y(), cTitleFont2));
sheet.addCell(new Label(8, i + 2, d.getWjdy(), cTitleFont2));
sheet.addCell(new Label(9, i + 2, d.getAcc(), cTitleFont2));
} 
wwb.write();
wwb.close();
wb.close(); 
if (file1.exists()) {
response.reset();
response
.setContentType("application/vnd.ms-excel;charset=gb2312");
response.addHeader("Content-Disposition",
"attachment; filename=\""
+ new String(("gps信息技术管理报表.xls")
.getBytes("gb2312"), "ISO8859_1")
+ "\"");
int fileLength = (int) file1.length();
response.setContentLength(fileLength);
if (fileLength != 0) {
InputStream inStream = new FileInputStream(file1);
byte[] buf = new byte[4096];
ServletOutputStream servletOS = response.getOutputStream();
int readLength;
while (((readLength = inStream.read(buf)) != -1)) {
servletOS.write(buf, 0, readLength);
}
inStream.close();
servletOS.flush();
servletOS.close();
}
}
file1.delete(); 
} catch (Exception e) {
e.printStackTrace();
}finally{
file = null;
file1 = null;
}
}
}我想用junit进行测试 我该怎样写junit呢？
请高手指点一下
谢谢

Answer 2

1。导入jUnit包
2。public class DeviceinfoBZ extends TestCase{

Answer 3

导入junit包, 4比较好用点,在你需要测试的方法上面加个@Test的注解就可以了,! 

Answer 4

myeclipse下 选中要测试的class点击 new -> Junit test case

Answer 5

1。导入jUnit包
2。public class DeviceinfoBZTest extends TestCase{DeviceinfoBZ testDeviceinfoBZ; public void setup(){
 super.setup();
  testDeviceinfoBZ =new DeviceinfoBZ ();
 }
  
 public void test方法名(){
  assertTure或者assertNotNull或者assertEquals(testDeviceinfoBZ.方法名)
 }不过你这里是struts1里面的action，没有分离数据库连接代码， 最好是把连接代码写到一个类中，然后进行测试，这样好点。}

Answer 6

package com.anhuily.callcenter.gps.deviceinfo;import static org.junit.Assert.*;import java.util.ArrayList;
import java.util.List;import org.junit.BeforeClass;
import org.junit.Test; 
public class DeviceinforTest {
static DeviceinfoBZ db=null;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
db=new DeviceinfoBZ();
} @Test
public void testGetTotalRow() {
fail("Not yet implemented");
} @Test
public void testFindgpsbyzrrmc() { 
db.findgpsbyzrrmc("160700010"
," realtime>='20100609 00:00:00' and realtime<='20100609 01:00:00' "
,"2010_06_09"
, 0, 30);
fail("Not yet implemented");
} @Test
public void testExpgpsbyzrrmc() {
fail("Not yet implemented");
} @Test
public void testSetTotalRow() {
fail("Not yet implemented");
}}
这是我写的junit类
可是它报空指针异常啊

Answer 7

异常为：
connect error : java.lang.NullPointerException
java.sql.SQLException: connect error : java.lang.NullPointerException
at com.cms.db.dao.SQLCommandBean.getConnection(SQLCommandBean.java:152)
at com.cms.db.dao.SQLCommandBean.executeQuery(SQLCommandBean.java:259)
at com.anhuily.callcenter.gps.deviceinfo.DeviceinfoBZ.findgpsbyzrrmc(DeviceinfoBZ.java:60)
at com.anhuily.callcenter.gps.deviceinfo.DeviceinforTest.testFindgpsbyzrrmc(DeviceinforTest.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99)
at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)
at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)
at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:71)
at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)
at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

Answer 8

看下这几行对应的代码，应该是getConnection的问题
at com.cms.db.dao.SQLCommandBean.getConnection(SQLCommandBean.java:152)
at com.cms.db.dao.SQLCommandBean.executeQuery(SQLCommandBean.java:259)
at com.anhuily.callcenter.gps.deviceinfo.DeviceinfoBZ.findgpsbyzrrmc(DeviceinfoBZ.java:60)
at com.anhuily.callcenter.gps.deviceinfo.DeviceinforTest.testFindgpsbyzrrmc(DeviceinforTest.java:24)