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截取字符�?针对字符串插入数据库,长度问题)

Thu, 08 Nov 2007 03:42:00 GMT

/**
* 截取字节数组长度不超�q�len的字�W�串,oracle数据库中varchar2(4000)长度相当于java中byte�?000个长�?br /> * */
     public String cutString(String str,int len){
    byte[] a=str.getBytes();
    byte[] b=new byte[len];
    if(a.length>len){
    System.arraycopy(a, 0, b, 0, len);
    }
    return new String(b);
     }

张金�?/a> 2007-11-08 11:42 发表评论

Tue, 16 Oct 2007 08:55:00 GMT

/**
   import com.lowagie.text.*;
   import com.lowagie.text.pdf.PdfWriter;
   import java.io.*;
   import java.text.*;
   文��输出
*/
public static void billImagePdfGenerator(String pdfMsg, String brand, OutputStream output)
    {
        Document document = new Document(PageSize.A4);
        String tempStr = "";
        try
        {
            PdfWriter.getInstance(document, output);
            document.open();
            Image jpg = Image.getInstance("emice/jsp/images/bi" + brand + ".jpg");
            jpg.scalePercent(80F);
            document.add(jpg);
            BufferedReader reader = null;
            reader = new BufferedReader(new StringReader(pdfMsg));
            while((tempStr = reader.readLine()) != null)
            {
                if(tempStr.startsWith("Page "))
                    document.newPage();
                Phrase phrase = new Phrase(10F, tempStr + "\n", FontFactory.getFont("Courier", 9F));
                document.add(phrase);
            }
            document.close();
            reader.close();
        }
        catch(DocumentException de)
        {
            System.err.println(de.getMessage());
        }
        catch(IOException ioe)
        {
            System.err.println(ioe.getMessage());
        }
    }



/**
     获取向前或者向后几天的日期
*/
public static final String getCaseFormatTime(int shiftDay)
    {
        Calendar cal = Calendar.getInstance();
        int year = cal.get(1);
        int month = cal.get(2);
        int date = cal.get(5);
        int hour = cal.get(11);
        int minute = cal.get(12);
        int second = cal.get(13);
        date += shiftDay;
        cal.set(year, month, date, hour, minute, second);
        Date d = cal.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US);
        String dateString = sdf.format(d);
        return dateString;
    }



    /**
      获取当前旉��
    */
    public static final String getCurrentFormatDate()
    {
        Date d = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US);
        String dateString = sdf.format(d);
        return dateString;
    }

    /**
      获取资源文�g内容
      import org.apache.struts.util.MessageResources;
      import org.apache.struts.util.PropertyMessageResourcesFactory;
    */
    public static String getMessage(String resourceName, String messageName)
    {
        MessageResources resource = (new PropertyMessageResourcesFactory()).createResources(resourceName);
        String value = resource.getMessage(messageName);
        if(value == null)
            value = "";
        return value;
    }

张金�?/a> 2007-10-16 16:55 发表评论

杂议java知识

Tue, 08 May 2007 03:16:00 GMT

在windows�q�_��下，按回车会'\r','\n'两个字符�Q�而在linux下只产生一�?\n'字符

String�c�d��StringBuffer(StringBuilder)�c?br>1 String�c�d��象中的内容一但初始化��׃��能再改变�?br>2 StringBuffer�cȝ��于封装内容可以改变的字符丌Ӏ��用toString()�Ҏ��转换成String�c�d��?br>3 StringBuilder�c?JDK1.5新加的类)实现了和StringBuffer的同��L��功能�Q�它的操作速度更快�Q�但它不保证多线�E�的安全性，所以如果它门不参与多线�E�推荐��用StringBuilder�c�，而参与多�U�程推荐使用StringBuffer�c?
4 String中提供的一些改变内容的�Ҏ��Q�实际上都是调用了StringBuffer�cȝ��Ҏ��。String="a"+1+"b";�~�译时等效于String x=new StringBuffer().append("a").append(a).append("b").toString();
5 字符串常量，实际上是一中特�D�的匿名String对象�Q��用字�W�串帔R��有时可以节省内存�I�间�?br>String(byte[] bytes, int offset, int length) //构造函数将byte[]转换成string�c�d��
public String substring(int beginIndex,int endIndex)//从beginIndex开始截取到endIndex-1为止�Q�截取的长度为endIndex-beginIndex.

数据�c�d��与包装类
boolean---Boolean byte---Byte char--Character short--Short int--Integer long--Long float--Float double--Double
基本数据�c�d��不具有对象的�Ҏ��，而包装类��h��对象的特性�?br>String--->Integer的方�?nbsp; new Integer(String str);Integer.valueOf(str);
Integer--->int的方�?nbsp; Integer.intValue();
String--->int的三个方法，Integer.parseInt(str);new Integer(String str).intValue;Integer.valueOf(str).intValue();
int--->String String.valueOf(int);

集合�c?br>集合�cȝ��于存储一�l�对象，其中的每个对象称之�ؓ元素�Q�经�怼�用到的有Vector,Enumeration,ArrayList,Collection,Iterator,Set,List�{�集合类和接口。Enumeration,Collection,Iterator,set,List�q�些接口不是集合�c�，而是提供了各�U�方法来操作集合�c�d��象�?/font>

Vector�c�M��Enumeration接口
Vector v=new Vector;
Emumeration e=v.elements();
while(e.hasMoreElements())
{
e.nextElement();
}
Enumeration是个接口�c�，可以从各�U�数据类型中取出元素�?/font>

Collection接口与Iterator接口�?br>ArraryList是实现Collection接口的类�?br>ArrayList与Vector的区�?
ArrayList没有实现�U�程的同步，而Vector实现了线�E�的同步�Q�但ArrayList的执行效率比Vector高，所以程序不存在�U�程安全问题时应使用ArrayList.

Collection,Set,List的区别：
Collection是Set,List的父�c�，Collection各元素对象之间没有指定的��序�Q�允许有重复元素和多个null元素对象�?br>Set各元素对象之间没有指定的��序�Q�不允许有重复元素，最多允许有一个叫null的元素对象�?br>List各元素对象之间有指定的顺序，允许有重复元素和多个null元素对象�?/font>

Hashtable�c?br>Hashtable是高�U�数据结构，可以快速检索数据，动态存储一�p�d��的对象，对存储的每一个对�?�?都要安排另一个对�?�U�Cؓ关键�?与之相关联�?br>存储数据:Hashtable.put(Object key,Object value) 值和关键字可一是�Q何非�I�的对象。存储数据时如关键字相同�Q�则原来的那个��D��覆盖掉�?br>��索数�?Hashtable.get(Object key) 用作关键字的�c�d��覆盖Object.hashCode�Ҏ��和Object.equals�Ҏ��.
String�cȝ��hashCode已经覆盖了关键字�cȝ��hashCode�Q�只要两个字�W�串相等�Q�他们的hashCode也相�{�。但StringBuffer�c�L��有覆盖关键字�cȝ��hashCode.

Properties�c?br>1 Propeties�c�L��Hashtable的子�c?br>2 增加了将Hashtable对象中的关键字和��g��存到文�g和从文�g中读取关键字和值到Hashtable对象中的�Ҏ��?br>3 如果要用Properties.store(FileOutputStream out,String str)�Ҏ��存储Properties对象中的内容�Q�每个属性的关键字和值多必须是String�c�d��的。从文�g中装载数据��用的是Properties.load()�Ҏ��?br>4 Properties.get()�Ҏ��q�回的是Object�c�d��的，Properties.getProperty(..)�q�回的是String�c�d��的。Properties.setProperty(...)的参数类型必��L��String�c�d��.(取得或设�|�Properties中的�?

System与Runtime�c?br>System�c�M��所有的成员都是静态的�Q?br>1 exit(int status)提前�l�止虚拟机的�q�行�Q�正常操作传递的参数�?�Q�异常终止传递的是非零倹{�?br>2 currentTimeMillis�Ҏ��q�回的是一个自1970�q?�?�?�?�?�U��v的以毫秒为单位的long 型的大数字�?br>3 Java虚拟机的�pȝ��属性：System.getProperties()和System.setProperties()�Ҏ��分别取得和设�|�Java虚拟机的�pȝ��属性。Enumeration e=System.getProperties().propertyNames();

Runtime�c?br>��装了Java虚拟��E�，一个Java虚拟机对应一个Runtime实例对象�Q�不能直接创��Z��个对象，通过Runtime.getRuntime()�Ҏ��q�回一个Runtime的实例对象的引用。用exec�Ҏ��可以启动一个子�q�程�q�回的是一个Process的对象。例�Q�Process p=Runtime.getRuntime().exec("notepad.exe Test.java");参数��E�名和用该进�E�打开文�g名�?/font>

张金�?/a> 2007-05-08 11:16 发表评论

Fri, 16 Mar 2007 07:28:00 GMT

摘要: 1 /** */ /** 2 * 3 */ 4 ... 阅读全文

张金�?/a> 2007-03-16 15:28 发表评论

文�g上传

Fri, 16 Mar 2007 07:27:00 GMT

1 package com.stt.doss.common.util.upload;
2
3 import java.io.BufferedInputStream;
4 import java.io.BufferedOutputStream;
5 import java.io.File;
6 import java.io.FileNotFoundException;
7 import java.io.FileOutputStream;
8 import java.io.IOException;
9 import java.io.InputStream;
10 import java.io.OutputStream;
11
12 import org.apache.commons.logging.Log;
13 import org.apache.commons.logging.LogFactory;
14 import org.apache.struts.upload.FormFile;
15
16 /**
17 *

18 * Title:
19 *

20 *

21 * Description:
22 *

23 *

24 * Copyright: Copyright (c) 2006
25 *

26 *

27 * Company: stt
28 *

29 *
30 * @author william
31 * @version 1.0
32 */
33 public class UploadHelper {
34
35      private static Log log = LogFactory.getLog(UploadHelper. class );
36
37      public static void uploadFileForm(FormFile formFile, String folderPath,
38             String fileName) {
39         log.info( " UploadHelper() uploadFileForm start. " );
40          // retrieve the file data
41         InputStream inputStream = null ;
42         OutputStream outputStream = null ;
43
44          int bytesRead = 0 ;
45          byte [] buffer = new byte [ 8192 ];
46
47         File file = new File(folderPath);
48          if ( ! file.exists()) {
49              boolean f = file.mkdir();
50              if ( ! f) {
51                 f = file.mkdirs();
52                  if ( ! f) {
53
54                 }
55             }
56
57         }
58
59          try {
60             StringBuffer filePath = new StringBuffer();
61             filePath.append(folderPath);
62             filePath.append(File.separator);
63             filePath.append(fileName);
64
65             inputStream = new BufferedInputStream(formFile.getInputStream(),
66                      2048 );
67             outputStream = new BufferedOutputStream( new FileOutputStream(
68                     filePath.toString()), 2048 );
69
70              // read and write
71              while ((bytesRead = inputStream.read(buffer, 0 , 8192 )) != - 1 ) {
72                 outputStream.write(buffer, 0 , bytesRead);
73             }
74         } catch (FileNotFoundException fnfe) {
75             fnfe.printStackTrace();
76         } catch (IOException ioe) {
77             ioe.printStackTrace();
78         } finally {
79              try {
80                  // close the stream
81                 outputStream.close();
82                 inputStream.close();
83             } catch (IOException ioe) {
84                 ioe.printStackTrace();
85             }
86              // destroy the temporary file
87             formFile.destroy();
88         }
89
90     } // end uploadFileForm
91
92      public static void deleteFile(String path) {
93         log.info( " UploadHelper() deleteFile start. " );
94         File file = new File(path);
95         file.delete();
96     }
97 }
98

张金�?/a> 2007-03-16 15:27 发表评论

文�g下蝲

Fri, 16 Mar 2007 07:26:00 GMT

1 package com.stt.doss.common.util.upload;
2
3 import java.io.BufferedOutputStream;
4 import java.io.FileInputStream;
5 import java.io.FileNotFoundException;
6 import java.io.IOException;
7 import java.io.UnsupportedEncodingException;
8
9 import javax.servlet.http.HttpServletResponse;
10
11 import com.stt.doss.util.Convertor;
12
13 /**
14 *

15 * Title:
16 *

17 *

18 * Description:处理下蝲文�g工具�c?br /> 19 *

20 *

21 * Copyright: Copyright (c) 2006
22 *

23 *

24 * Company: stt
25 *

26 *
27 * @author william
28 * @version 1.0
29 */
30 public class DownloadHelper {
31
32      /**
33      * 下蝲文�g
34      *
35      * @param response
36      * @param fileName
37      * @param filePath
38       */
39      public static void downloadFile(HttpServletResponse response, String fileName,
40             String fileAllPath) {
41
42         StringBuffer sb = new StringBuffer( 150 );
43         sb.append( " attachment;  filename= " );
44         sb.append(Convertor.iso2gbk(fileName));
45
46          if ( null != fileAllPath && fileName != null ) {
47             FileInputStream fis = null ;
48             BufferedOutputStream bos = null ;
49              try {
50                 response
51                         .setContentType( " application/x-msdownload;charset=GB2312 " );
52
53                 response.setHeader( " Content-Disposition " , new String(sb
54                         .toString().getBytes(), " ISO-8859-1 " ));
55                 fis = new FileInputStream(Convertor.iso2gbk(fileAllPath));
56                 bos = new BufferedOutputStream(response.getOutputStream());
57                  byte [] buffer = new byte [ 2048 ];
58                  while (fis.read(buffer) != - 1 ) {
59                     bos.write(buffer);
60                 }
61                 bos.write(buffer, 0 , buffer.length);
62                  // fis.close();
63                  // bos.close();
64             } catch (UnsupportedEncodingException e) {
65                  // TODO Auto-generated catch block
66                 e.printStackTrace();
67                  throw new RuntimeException();
68             } catch (FileNotFoundException e) {
69                  // TODO Auto-generated catch block
70                 e.printStackTrace();
71                  throw new RuntimeException();
72             } catch (IOException e) {
73                  // TODO Auto-generated catch block
74                 e.printStackTrace();
75                  throw new RuntimeException();
76             } finally {
77                  try {
78                      if (fis != null ) {
79                         fis.close();
80                     }
81                      if (bos != null ) {
82                         bos.close();
83                     }
84                 } catch (IOException e) {
85                      // TODO Auto-generated catch block
86                     e.printStackTrace();
87                      throw new RuntimeException();
88                 }
89
90             }
91         }
92
93     }
94 }
95

张金�?/a> 2007-03-16 15:26 发表评论

前台分页

Fri, 16 Mar 2007 07:25:00 GMT

摘要: 1 package com.stt.doss.common.util; 2 3 import java.io.IOException; 4 import ... 阅读全文

张金�?/a> 2007-03-16 15:25 发表评论

字符串变数组

Fri, 16 Mar 2007 07:24:00 GMT

1 package com.stt.doss.common.util;
2
3 import java.util.StringTokenizer;
4
5 public class StringUtils {
6      public static String[] str2Array(String str,String s) {
7          if (str == null ) {
8              return null ;
9         }
10         StringTokenizer st = new StringTokenizer(str,s);
11         String[] strs = new String[st.countTokens()];
12          int i = 0 ;
13          while (st.hasMoreTokens()) {
14             strs[i] = st.nextToken();
15             i ++ ;
16         }
17
18          return strs;
19     }
20
21 }

张金�?/a> 2007-03-16 15:24 发表评论

去除所有引��L��操作

Wed, 07 Feb 2007 05:23:00 GMT

//先去�? ",得到"...................................."�q�样的一个字�W�串,然后再去除一头一��引号
public static void replaceChar(String s){
        //String s = "01290943050280128550\" \"01\" \"0\" \"13548418074\" \"923041\" \"13548418074\" \"1862      \" \"1862SMS   \" \"01\" \"0     \" \"0     \" \"0      \" \"0\" \"85 \" \"280 \" \"002801\" \"      \" \"13800280500\" \"20070129094305\" \"20070129094314\" \"PXY08 \" \"0";
        String ss = s.replaceAll("\" \"","");
        System.out.println(" ss ="+ss);
        ss = ss.replaceAll("\"","");
        System.out.println(" ss ="+ss);
    }

public static void readFile(){
        try{
            File file = new File("D:\\dosp\\t.txt");
            java.io.FileReader reader = new FileReader(file);

            BufferedReader br = new BufferedReader(reader);
            String s = br.readLine();
            System.out.println(" s = " + s);
            replaceChar(s);
        }catch(Exception e){
            e.printStackTrace();
        }
    }
public static void main(String[] args) {
        Test test = new Test();
        readFile();
    }

以下是在文本t.txt中的例子(处于一�?每个字段用引��h��?各个字段之间有空�?

"01282356000280118304" "01" "0" "           " "923084" "13466390573" "5198      " "-GSSP     " "03" "0     " "1500 " "DB:0115" "1" "101" "    " "002801" "      " "13800280500" "20070128235602" "20070128235602" "Agent0" "0         "

�q�过上面函数处理后得�?
�W�一步得�?
"01282356000280118304010           923084134663905735198      -GSSP     030     1500 DB:01151101    002801      138002805002007012823560220070128235602Agent00         "

�W�二步得�?
01282356000280118304010           923084134663905735198      -GSSP     030     1500 DB:01151101    002801      138002805002007012823560220070128235602Agent00

张金�?/a> 2007-02-07 13:23 发表评论

与数据库操作相关的工��L��

Wed, 07 Feb 2007 03:11:00 GMT

摘要: 1 package com.stt.dosp.datacollect.util; 2 3 import java.sql.Connection; 4 imp... 阅读全文

张金�?/a> 2007-02-07 11:11 发表评论

Wed, 07 Feb 2007 03:02:00 GMT

摘要: 1 package com.stt.dosp.datacollect.util; 2 3 // import java.io.BufferedReader; 4 ... 阅读全文

张金�?/a> 2007-02-07 11:02 发表评论

Wed, 07 Feb 2007 03:00:00 GMT

/**
     * �q�行SQL字符串的规则化�?br />     * 目前只处理将其中�?转换为内容，卛_��上�{义符�?br />     */
    public static String normalizeString(String sql){
        // 在null的情况下�Q�返�?"�Q�以便插入数据库�?br />        // 因�ؓnull在数据库中插入后成�ؓ"null"�Q�不正确�?br />        if ( (null == sql) || ("".equals(sql)) )
            return "";

        int lastIndex = sql.lastIndexOf("'");
        if ( lastIndex < 0 )
            return sql;
        if ( 0 == lastIndex )
            return "'" + sql;

int[] sepIndexArray = new int[lastIndex + 1 + 2];
sepIndexArray[0] = 0;

        int startIndex = -1;
        int sepIndex = 1;
        while ( (startIndex = sql.indexOf("'", startIndex + 1)) >= 0 )
            sepIndexArray[sepIndex++] = startIndex;

sepIndexArray[sepIndex] = sql.length();

        String result = sql.substring(sepIndexArray[0], sepIndexArray[1]);
        for ( int i = 1; i < sepIndex; i++ )
            result = result
                + "'" + sql.substring(sepIndexArray[i], sepIndexArray[i + 1]);

return result;
}

张金�?/a> 2007-02-07 11:00 发表评论

Wed, 07 Feb 2007 02:59:00 GMT

/**
* 格式化日�?
* */
    public static String formatTime( Calendar cal, String format ){
        SimpleDateFormat localTimeFormatter
            = new SimpleDateFormat(format);
        return localTimeFormatter.format(cal.getTime());
    }
    /**
* 格式化日�?
* */
    public static Calendar formatDate( String time, String format ){
        try{
            Date d = new Date();
            SimpleDateFormat timeFormatter1
                = new SimpleDateFormat(format);
            d = timeFormatter1.parse(time);
            Calendar cal = Calendar.getInstance();
            cal.setTime(d);
            return cal;
        }catch ( Exception ex ){
            log.error("error: ", ex);
            return Calendar.getInstance();
        }
    }

张金�?/a> 2007-02-07 10:59 发表评论

分割字符�?先去除所有空�?再去引号操作

Wed, 07 Feb 2007 02:57:00 GMT

    /**
* 分割字符�?先去除所有空�?再去引号操作
* */
protected String[] splitString(String lineString){
   ArrayList list = new ArrayList();
   StringBuffer sb = new StringBuffer();
   String[] temp_columnArray = null;
   String[] columnArray = null;
   //字符串如果含有空��|��则空��gؓ“半角状态下的空格”，如果为全角状态下�Q�则�I�格长度�?
   lineString = lineString.trim();
   char[] chars = lineString.toCharArray();
   int length = chars.length;
   for(int i = 0; i < chars.length; i++){
    if(String.valueOf(chars[i]).trim().length()<1){
     length --;
    }else{
     sb.append(String.valueOf(chars[i]));
    }
   }
         System.out.println(sb.toString());
         String str = sb.toString();
         temp_columnArray = str.split("['\"']");
         for(int i = 0; i < temp_columnArray.length; i++){
        if(temp_columnArray[i].trim().length()>=1){
           list.add(temp_columnArray[i]);
        }
         }
         columnArray = (String[])list.toArray(new String[(temp_columnArray.length/2)-1]);
         System.out.println(columnArray.length);
         for(int i = 0; i < columnArray.length; i++){
        System.out.println(columnArray[i]);
         }
  return columnArray;
}

字符串范�?处于一行中,�q�且每个字段有引�?: "01290943050280128550" "01" "0" "13548418074" "923041" "13548418074" "1862      " "1862SMS   " "01" "0     " "0     " "0      " "0" "85 " "280 " "002801" "   33   " "13800280500" "20070129094305" "20070129094314" "PXY08 " "0         "

张金�?/a> 2007-02-07 10:57 发表评论

Wed, 07 Feb 2007 02:49:00 GMT

/**
* 分割字符�?去除字符串中的所有空�?--1
* */
protected String[] splitString(String lineString){
   ArrayList list = new ArrayList();
   String[] columnArray = null;
   //字符串如果含有空��|��则空��gؓ“半角状态下的空格”，如果为全角状态下�Q�则�I�格长度�?
//   String lineString = "        z   j   p ";
   lineString = lineString.trim();
   char[] chars = lineString.toCharArray();
   int length = chars.length;
   for(int i = 0; i < chars.length; i++){
    if(String.valueOf(chars[i]).trim().length()<1){
     length --;
    }else{
     list.add(String.valueOf(chars[i]));
    }
   }
   columnArray = (String[])list.toArray(new String[length]);

  return columnArray;
}

例如lineString ="        z   j   p ", 则最后的columnArray数组内容为{z,j,p},长度�?

张金�?/a> 2007-02-07 10:49 发表评论