非常实用的Java工具类

1、package d150814_0_3;import java.io.BufferedInputStream;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import j

2、ava.io.OutputStream;import java.io.OutputStreamWriter;import java.security.MessageDigest;import java.text.DecimalFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Enumeration;import java.util.Properties;import java.util.jar.JarEntry;import java.util.jar.JarFil

3、e;import java.util.zip.ZipEntry;import java.util.zip.ZipFile;/* * 常用函数集 */public class Util /* * 默认类型 */ public final static String CONTENT_TYPE = "text/html; charset=GBK" /* * 界面风格常数 网格检索 */ public final static int M_VIEW=1; /* * 界面风格常数 单记录编辑 */ public final static int M_EDIT=2; /* * 界面风格

4、常数 网格+记录编辑 */ public final static int M_INP=3; /* * 界面风格常数 网格+记录查询 */ public final static int M_QRY=4; /* * 界面风格常数 网格+嵌入记录编辑 */ public final static int M_LINEINP=5; /* * 界面风格常数 网格+嵌入记录查询 */ public final static int M_LINEQRY=6; /* * 界面风格常数 网格+窗口记录编辑 */ public final static int M_WININP=7; /* * 界面风格常数

5、网格+窗口记录查询 */ public final static int M_WINQRY=8; /* * 界面工作选项不显示菜单 */ public final static int PM_NOMENU=1; /* * 界面工作选项不分页 */ public final static int PM_NOPAGE=2; /* * 界面工作选项模式窗体 */ public final static int PM_MODAL=4; /* * 默认表格背景色 */ public static String GRIDBGCOLOR="#F2F2F2"/A9B6CD /* * 默认编

6、辑背景色 */ public static String EDITBGCOLOR="#F2F2F2"/A9B6CD /* * 默认表格选择记录色 */ public static String HICOLOR="#C8D1C6" /"#ffff99" /"#d0d0d0" /* * 默认表格选中记录色 */ public static String CHOOSECOLOR="#ccffcc" /"#ff99ff" /* * 默认表头背景色 */ public static S

7、tring HEADBGCOLOR="#c0c0c0" /* * 默认表头字体颜色 */ public static String HEADFONTCOLOR="#0000FF" /* * 默认条件背景色 */ public static String CONDBGCOLOR="#d0d0d0" /* * 默认条件标题字体颜色 */ public static String CONDTITLEFONTCOLOR="#0000ff" /* * 默认条件标题背景色 */ public static String CON

8、DTITLEBGCOLOR="#d0d0d0" /* * 返回临时目录 */ public static File tempDir() String temp=System.getProperty("Temp",null); if (temp=null | temp.length()=0) temp="Temp" File f=new File(temp); if (!f.exists() f.mkdir(); return f; /错误处理和记录 static StringBuffer errs=new StringBuffer()

9、; static int ErrNum=0; /* * 错误提示,建议都用此函数输出调试信息 */ public static void Err(String err) ErrNum+; if (ErrNum>100) errs.delete(0,errs.indexOf("n")+1); errs.append(err+"n"); System.err.println(err); /* * 返回最后100行的错误信息 */ public static String Err() return errs.toString(); /* * 字符串截取函

10、数. * * 返回以semi分隔开的第n段字符串.n从1开始 */ public static String middle(String s,String semi,int n) if (s=null) return null; int nn=0; /表示当前层次 boolean found=true; int i=0; if (n<=0) n=1; int len=0; while (i<s.length() char c=s.charAt(i); if (c='(' && !semi.equals("(") &&

11、; !semi.equals("&") nn+; else if (c=')' && !semi.equals(")") && !semi.equals("&") if (nn>0) nn-; else if (nn=0 && found) n-; if (n=0) /找到数据，获得数据就可以了 int j=i+len; int j0=j; while (j<s.length() c=s.charAt(j); if (c='('

12、 && !semi.equals("(") && !semi.equals("&") nn+; else if (c=')' && !semi.equals(")") && !semi.equals("&") if (nn>0) nn-; else if (nn=0) if (j+semi.length()<=s.length() if (s.substring(j,j+semi.length().equal

13、s(semi) return s.substring(j0,j); j+; if (j0<s.length() return s.substring(j0); else return "" else if (len=0) i-; else i+=semi.length()-1; i+; if (i+semi.length()<s.length() found=s.substring(i,i+semi.length().equals(semi); else break; len=semi.length(); return "" /* * 字符串

14、截断函数. * * 返回以semi分隔的第n段及其后面的所有字符的串,包括后面可能的任何符号 */ public static String tail(String s,String semi,int n) int nn=0; /表示当前层次 boolean found=true; int i=0; if (n<=0) n=1; int len=0; while (i<s.length() char c=s.charAt(i); if (c='(' && !semi.equals("(") && !semi.equ

15、als("&") nn+; else if (c=')' && !semi.equals(")") && !semi.equals("&") if (nn>0) nn-; else if (nn=0 && found) n-; if (n=0) /找到数据，获得数据就可以了 int j=i+len; if (j>=s.length() return "" else return s.substring(j); else if

16、 (len=0) i-; else i+=semi.length()-1; i+; if (i+semi.length()<s.length() found=s.substring(i,i+semi.length().equals(semi); else break; len=semi.length(); return "" /* * 日期转换函数. 返回"mm月dd日"格式 */ public static String shortDate(java.util.Date d) SimpleDateFormat fmt=new SimpleDate

17、Format("MM月dd日"); return fmt.format(d); /* * 日期函数转字符串. * * format是日期格式yyyyMMddHHmmss,注意大小写. */ public static String dtos(java.util.Date d,String format) if (d=null) return "" SimpleDateFormat fmt=new SimpleDateFormat(format); String s=fmt.format(d); return s; /* * 字符串专日期. * * 合法的

18、日期格式是"1972-01-01". 允许输入成中文的""替代"-"允许用"."代替"-" 允许没有"-"分隔,但必须是8位数字; 允许日期时间格式串传入(字段只取空格前部分) */ public static java.util.Date stod(String s) if (s.equals("") s="" if (s.length()=8) s=s.substring(0,4)+"-"+s.substring

19、(4,6)+"-"+s.substring(6,8); while (s.indexOf("")>=0) s=middle(s,"",1)+"-"+tail(s,"",2); while (s.indexOf(".")>=0) s=middle(s,".",1)+"-"+tail(s,".",2); return stod(s,"yyyy-MM-dd"); /* * 字符串按格式转为日

20、期. * * 如果空,则返回null; * 如果转换错误, 首先尝试按"日期时间格式"处理,如果仍然错误,返回null */ public static java.util.Date stod(String s,String format) if (s.equals("") s="" if (s.equals("") return null; try SimpleDateFormat fmt=new SimpleDateFormat(format); return fmt.parse(s); catch (Pars

21、eException e) if (format.equals("yyyy-MM-dd HH:mm:ss") try SimpleDateFormat fmt=new SimpleDateFormat("yyyy-MM-dd HH:mm"); return fmt.parse(s); catch(ParseException ee) try SimpleDateFormat fmt=new SimpleDateFormat("yyyy-MM-dd"); return fmt.parse(s); catch(ParseException

22、 eee) Err("Util.stod ERR:"+eee+" fmt="+format); else Err("Util.stod ERR:"+e+" fmt="+format); return null; /* * 整数简化函数. * * 超过1000,按K处理, 超过1000000按M处理 否则为B */ public static String shortInt(long nn) double f=nn; DecimalFormat fmt=new DecimalFormat("0.0"

23、;); if (f<1000) return f+"B" else if (nn<1000000) return fmt.format(f/1000)+"K" else return fmt.format(f/1000000)+"M" /* * 实数格式化函数. * * format可为#和0的组合,其中可用分号代替逗号表示千分位 */ public static String formatFloat(double f,String format) DecimalFormat fmt=new DecimalFormat(f

24、ormat.replace('',','); String res=fmt.format(f); if (format.equals("#") && res.equals("0") res="" return res; /* * 字符转整数. * * 如果发生错误,返回0 */ public static int stoi(String s) try return Integer.parseInt(s); catch (Exception e) return 0; /* * 字符转长整数

25、. * * 如果发生错误,返回0 */ public static long stol(String s) try return Long.parseLong(s); catch (Exception e) return 0; /* * 字符转浮点数. * * 如果发生错误,返回0 */ public static double stof(String s) try return Double.parseDouble(s); catch (Exception e) return 0; /* * 字符集转换8859格式函数. * * 如果错误,则返回原串 */ public static Str

26、ing toISO(String str) if ( str = null ) return null; try return new String(str.getBytes(), "8859_1"); catch (Exception e) return str; /* * 简单的字符穿编码 */ public static String encode(String ss,String enc) StringBuffer sb=new StringBuffer(""); int x=0; for (int i=0;i<ss.length();i+

27、) int z=ss.charAt(i)enc.charAt(x); x+; if (x>=enc.length() x=0; if (i>0) sb.append('|'); sb.append(Long.toHexString(z); return sb.toString(); /* * 简单的字符穿解码 */ public static String decode(String ss,String enc) if (ss=null) return null; StringBuffer sb=new StringBuffer(""); int

28、 x=0; for (int i=1;i+) try String s=middle(ss,"|",i); if (s.length()=0) break; int z=Long.decode("#"+s).intValue()enc.charAt(x); x+; if (x>=enc.length() x=0; sb.append(char)z); catch (Exception e) return sb.toString(); /BASE64的字符串编码和解码 private static byte basis_64 = 'A'

29、;,'B','C','D','E','F','G','H', 'I','J','K','L','M','N','O','P', 'Q','R','S','T','U','V','W','X', 'Y','Z&

30、#39;,'a','b','c','d','e','f', 'g','h','i','j','k','l','m','n', 'o','p','q','r','s','t','u','v', 'w','x','

31、;y','z','0','1','2','3', '4','5','6','7','8','9','.','$', '?','?','?','?','?','?','?','?', '?','?','?',&

32、#39;?','?','?','?','?', '?','?','?','?','?','?','?','?', '?','?','?','?','?','?','?','?', '?','?','?','?'

33、;,'?','?','?','?', '?','?','?','?','?','?','?','?', '?','?','?','?','?','?','?','?', '?','?','?','?','?&

34、#39;,'?','?','?' ; private static byte index_64 = -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 63, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, 52, 53, 54, 55, 56, 57, 58, 59, 60

35、, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 ; private static byte CHA

36、R64(byte c) if (c<0 | c> 127) return -1; return index_64c; /* * 64位编码. * * 返回实际长度，0=fail -1=BufOverflow */ static int encode64(byte in, int inlen, byte out, int outmax) int olen = (inlen + 2) / 3 * 4; if (outmax < olen) return -1; int i=0,j=0; /blah = outi; while (inlen >= 3) byte n=(byt

37、e)(char)inj>>>2)&0x3f); outi=basis_64n; i+; n=(byte)(char)inj << 4) & 0x30) | (char)inj+1>>>4)&0xf)&0x3f); outi=basis_64n; i+; n=(byte)(char)inj+1 << 2) & 0x3c) | (char)inj+2>>>6)&0x3)&0x3f); outi=basis_64n; i+; n=(byte)(char)inj+2 &

38、amp; 0x3f); outi=basis_64n; i+; inlen -= 3; j+=3; if (inlen > 0) byte n=(byte)(char)inj>>>2)&0x3f); outi = basis_64n; byte oval =(byte)(char)inj << 4) & 0x30); if (inlen > 1) oval |= (char)inj+1 >>> 4)&0xf; i+; outi=basis_64oval; i+; outi=(inlen < 2) ? (b

39、yte)'!' : basis_64(byte)(char)inj+1 << 2) & 0x3c); i+; outi= (byte)'!' i+; if (olen < outmax) outi=0; return olen; /* * 64位解码 */ public static int decode64(byte in, int inlen, byte out) int len=0; byte c1,c2,c3,c4; int i=0,j=0; /if (in0 = '.' && in1 = 

40、9; ') i+=2; if (ini =0) return -1; for (int lup = 0; lup < inlen / 4; lup+) c1 = ini; if (CHAR64(c1) = -1) return -1; c2 = ini+1; if (CHAR64(c2) = -1) return -1; c3 = ini+2; if (c3 != '!' && CHAR64(c3) = -1) return -1; c4 = ini+3; if (c4 != '!' && CHAR64(c4) =

41、-1) return -1; /Util.Err("c1="+c1+",c2="+c2+","+c3+","+c4); i+=4; /Util.Err("c1="+CHAR64(c1)+",c2="+CHAR64(c2)+","+CHAR64(c3)+","+CHAR64(c4); outj= (byte)(char)CHAR64(c1) << 2) & 0xfc) | (char)CHAR64(c2) >&g

42、t;> 4); j+; len+; if (c3 != '!') outj=(byte)(char)CHAR64(c2) << 4) & 0xf0) | (char)CHAR64(c3) >>> 2); j+; +len; if (c4 != '!') outj=(byte)(char)CHAR64(c3) << 6) & 0xc0) | (char)CHAR64(c4); j+; +len; outj=0; return len; /* * 字节专字符串 */ public static Stri

43、ng getBytes(byte buf,int from,int len) StringBuffer st=new StringBuffer(""); for (int i=0;i<len;i+) st.append(char)bufi+from); return st.toString(); /* * 字符串64位编码 */ public static String encode(String ss) /Util.Err("encoding "+ss); if (ss=null) return null; if (ss.length()=0)

44、return "" byte x=ss.getBytes(); byte z=new bytex.length+x.length+4; /for (int i=0;i<x.length;i+) Util.Err("x"+i+"="+xi); int size=encode64(x,x.length,z,z.length); if (size<=0) return "" String s=getBytes(z,0,size); x=null; z=null; return s; /* * 64位编码流文件

45、 * param is输入流 * param buf输出 * throws IOException */ public static void encodeStream(InputStream is,StringBuffer buf) throws IOException /Util.Err("encoding "+ss); if (is=null) return; byte x=new byte3072; byte z=new bytex.length+x.length+4; while (true) int size = is.read(x); if (size=-1)

46、 break; int sz = encode64(x, size, z, z.length); if (sz > 0) String s = getBytes(z, 0, sz); buf.append(s); x=null; z=null; /* * 对数据流的64位编码 */ public static void encodeStream(InputStream is,OutputStream os) throws IOException /Util.Err("encoding "+ss); if (is=null) return; byte x=new byt

47、e3072; byte z=new bytex.length+x.length+4; while (true) int size = is.read(x); if (size=-1) break; int sz = encode64(x, size, z, z.length); if (sz > 0) os.write(z,0,sz); x=null; z=null; /* * 对数据流的64位解码 */ public static void decodeStream(InputStream is,OutputStream os) throws IOException if (is=nu

48、ll) return; byte x=new byte4096; byte z=new byte4096; while(true) int nn=0; while (nn<4096) int num = is.read(x); if (num = -1) break; nn+=num; if (nn=0) break; int size=decode64(x,nn,z); os.write(z,0,size); /* * 保存属性到文件 */ public static void saveProperties(File f,Properties p,String but) try Out

49、putStreamWriter m = new OutputStreamWriter(new FileOutputStream(f),"UTF8");for (Enumeration e=p.keys();e.hasMoreElements();)String key=(String)e.nextElement();String val=(String)p.get(key);if (but!=null && but.length()>0)if (key.startsWith(but) continue;if (key.length()=0) conti

50、nue;m.write(key+"="+val+"rn");m.close(); catch (Exception e) Util.Err("saveProperties ERR:"+e); /* * 对zip文件的读函数. * * entry为目录和文件名 */ public static InputStream loadZipStream(String fn,String entry) File f=new File(fn); if (!f.exists() return null; try ZipFile z = new Zip

51、File(f); ZipEntry en = z.getEntry(entry); if (en = null) return null; return z.getInputStream(en); catch(Exception e) return null; /* * 对jar文件的读函数. * * entry为目录和文件名 */ public static InputStream loadJarStream(String fn,String entry) File f=new File(fn); if (!f.exists() return null; try JarFile z = ne

52、w JarFile(f); JarEntry en = z.getJarEntry(entry); if (en = null) return null; return z.getInputStream(en); catch(Exception e) return null; /* * 转换为Java格式字符串. * * m: 1=单引号处理 2=双引号处理 3=都处理 */ public static String stos(String s,int m) StringBuffer b=new StringBuffer(s); int i=0; while (i<b.length() if (b.charAt(i)='"' && (