一些非常有用的JAVA常用方法(1)
类别: JAVA教程 
作者:xiaoyou
出处: www.csdn.com
<%!
stc_RSYB_Name stcRSYName1[];
stc_SYB_INF stcSYBINF1[];
%>
<%/*
String p = (String) session.getValue("access");
if (p==null || !p.equals("1")) {
response.sendRedirect("error.htm");
return;
}*/
%>
<%!
file://得到机器名字或IP
String get_Myhostname(javax.servlet.http.HttpServletRequest request){
String myhostname = null;
try{
myhostname = request.getRemoteHost();
myhostname = myhostname.toUpperCase();
}catch(Exception e){}
return myhostname;
}
file://处理空字符串
String dealNull(String str) {
String returnstr = null;
if (str == null) returnstr = "";
else returnstr = str;
return returnstr;
}
file://处理空对象
Object dealNull(Object obj){
Object returnstr = null;
if (obj == null) returnstr = (Object)("");
else returnstr = obj;
return returnstr;
}
int dealEmpty(String s) {
s = dealNull(s);
if (s.equals("")) return 0;
return Integer.parseInt(s);
}
String replace(String str,String substr,String restr){
String[] tmp = split(str,substr);
String returnstr = null;
if(tmp.length!=0) {
returnstr = tmp[0];
for(int i = 0 ; i < tmp.length - 1 ; i++)
returnstr =dealNull(returnstr) + restr +tmp[i+1];
}
return dealNull(returnstr);
}
String htmlEncode(String txt){
txt = replace(txt,"&","&");
txt = replace(txt,"&","&");
txt = replace(txt,""",""");
txt = replace(txt,"/"",""");
txt = replace(txt,"<","<");
txt = replace(txt,"<","<");
txt = replace(txt,">",">");
txt = replace(txt,">",">");
txt = replace(txt," "," ");
txt = replace(txt," "," ");
return txt;
}
String unHtmlEncode(String txt){
txt = replace(txt,"&","&");
txt = replace(txt,""","/"");
txt = replace(txt,"<","<");
txt = replace(txt,">",">");
txt = replace(txt," "," ");
return txt;
}
file://ALERT Function
void sAlert(String title,String msg,String focus, JspWriter out){
try {
out.println("<script language=\'javascript\'>");
out.println("alert(/"" + title + "/" + /"//r//n/" + /"" + replace(replace(msg,"\'\'","\'"),"/"","///"") +"/");");
out.println(focus);
out.println("</script>");
} catch(Exception e) { System.out.println(e);}
}
file://CONFIRM Function
void sConfirm(String title,String msg ,String location,JspWriter out){
try{
out.println("<script language=\'javascript\'>");
out.println("if(confirm(/"" + title + "/" + /"//r//n/" + /"" + replace(msg,"/"","///"") + "/")){" );
out.println("var d = (new Date()).toString();");
out.println(location + "+ d;");
out.println("}");
out.println("parent.document.form1.text1.select();");
out.println("</script>");
} catch (Exception e) { }
}
file://得到字符串长度
int getStringLength(String s) {
int p = 0;
try {
int iLength = 0;
int irealLength = 0;
int j = 0;
p = s.getBytes("Shift_JIS").length;
} catch(java.io.UnsupportedEncodingException e) {}
return p;
}
void formatString(String s,int b,JspWriter out){
b--;
String t = "";
try {
int leng = getStringLength(s);
int j = 0;
if (leng > b) {
for (int i = 1; i <= b ; i++) {
t = s.substring(0,i);
if (t.getBytes("Shift_JIS").length <= b ) {
j++;
} else break;
}
file://j = j+1;
file://System.out.println("b=" + b + "----" + "j=" + j);
for(int i = 0;i < j; i++){
if(s.substring(i,i+1).equals(" "))
out.print(" ");
if(!s.substring(i,i+1).equals(" "))
out.print(htmlEncode(s.substring(i,i+1)));
}
if (s.substring(0,j).getBytes("Shift_JIS").length == b){
out.print("|");
}else{
out.print(" |");
}
} else {
for (int i = 0; i < b - leng ; i++)
t = t + " ";
for (int i = 0; i < s.length(); i++){
if(s.substring(i,i+1).equals(" "))
out.print(" ");
if(!s.substring(i,i+1).equals(" "))
out.print(htmlEncode(s.substring(i,i+1)));
}
out.print(htmlEncode(t + "|"));
}
} catch(Exception e){System.out.println("----" + e);}
}
file://判断是否为数字
boolean isNumeric(String number)
{
try
{
Integer.parseInt(number);
return true;
}
catch(NumberFormatException sqo)
{
return false;
}
}
file://判断是否为日期
String mk_date(String c_date,int c_mode)
{
String wk_buf= "";
String ToDay = "";
try
{
ToDay = Integer.toString(java.util.Calendar.getInstance().get(java.util.Calendar.YEAR));
switch(c_mode)
{
case 0:
{
wk_buf = c_date.substring(2, 4) + "/" + c_date.substring(4, 6);
if (c_date.length() == 8)
{
wk_buf = wk_buf + "/" + c_date.substring(6, 8);
}
break;
}
case 1:
{
for (int i=0; i<c_date.length();i++)
{
if (c_date.substring(i, i+1) == " ")
{
wk_buf = wk_buf + "0";
}
else
{
wk_buf = wk_buf + c_date.substring(i, i+1);
}
}
c_date = wk_buf;
wk_buf = "";
if (c_date.substring(0, 1) != "0" )
{
wk_buf = "19";
}
else
{
wk_buf = "20";
}
wk_buf = wk_buf + c_date.substring(0, 2) + c_date.substring(3, 5);
if (c_date.length() == 8)
{
wk_buf = wk_buf + c_date.substring(6, 8);
}
break;
}
case 2:
{
wk_buf = c_date.substring(0, 4) + c_date.substring(5, 7) + c_date.substring(8, 10);
break;
}
case 3:
{
for(int i=0; i<c_date.length();i++ )
{
if (c_date.substring(i, i+1) == " ")
{
wk_buf = wk_buf + "0";
}
else
{
wk_buf = wk_buf + c_date.substring(i, i+1);
}
}
c_date = wk_buf;
wk_buf = "";
if (Integer.parseInt(c_date.substring(0,2)) > Integer.parseInt(ToDay.substring(2, 4)))
{
wk_buf = Integer.toString(Integer.parseInt(ToDay.substring(0,2)) - 1);
}
else
{
wk_buf = ToDay.substring(0,2);
}
wk_buf = wk_buf + c_date.substring(0,2) + c_date.substring(3,5);
if (c_date.length() == 8)
{
wk_buf = wk_buf + c_date.substring(6,8);
}
break;
}
case 4:
{
wk_buf = c_date.substring(0,4) + "/" + c_date.substring(4,6) + "/" + c_date.substring(6, 8);
break;
}
case 5:
{
wk_buf = c_date.substring(0,4) + c_date.substring(5, 7);
break;
}
}
}
catch(Exception e)
{
System.out.println("wrong : " + e);
}
return wk_buf;
}
出处: www.csdn.com
<%!
stc_RSYB_Name stcRSYName1[];
stc_SYB_INF stcSYBINF1[];
%>
<%/*
String p = (String) session.getValue("access");
if (p==null || !p.equals("1")) {
response.sendRedirect("error.htm");
return;
}*/
%>
<%!
file://得到机器名字或IP
String get_Myhostname(javax.servlet.http.HttpServletRequest request){
String myhostname = null;
try{
myhostname = request.getRemoteHost();
myhostname = myhostname.toUpperCase();
}catch(Exception e){}
return myhostname;
}
file://处理空字符串
String dealNull(String str) {
String returnstr = null;
if (str == null) returnstr = "";
else returnstr = str;
return returnstr;
}
file://处理空对象
Object dealNull(Object obj){
Object returnstr = null;
if (obj == null) returnstr = (Object)("");
else returnstr = obj;
return returnstr;
}
int dealEmpty(String s) {
s = dealNull(s);
if (s.equals("")) return 0;
return Integer.parseInt(s);
}
String replace(String str,String substr,String restr){
String[] tmp = split(str,substr);
String returnstr = null;
if(tmp.length!=0) {
returnstr = tmp[0];
for(int i = 0 ; i < tmp.length - 1 ; i++)
returnstr =dealNull(returnstr) + restr +tmp[i+1];
}
return dealNull(returnstr);
}
String htmlEncode(String txt){
txt = replace(txt,"&","&");
txt = replace(txt,"&","&");
txt = replace(txt,""",""");
txt = replace(txt,"/"",""");
txt = replace(txt,"<","<");
txt = replace(txt,"<","<");
txt = replace(txt,">",">");
txt = replace(txt,">",">");
txt = replace(txt," "," ");
txt = replace(txt," "," ");
return txt;
}
String unHtmlEncode(String txt){
txt = replace(txt,"&","&");
txt = replace(txt,""","/"");
txt = replace(txt,"<","<");
txt = replace(txt,">",">");
txt = replace(txt," "," ");
return txt;
}
file://ALERT Function
void sAlert(String title,String msg,String focus, JspWriter out){
try {
out.println("<script language=\'javascript\'>");
out.println("alert(/"" + title + "/" + /"//r//n/" + /"" + replace(replace(msg,"\'\'","\'"),"/"","///"") +"/");");
out.println(focus);
out.println("</script>");
} catch(Exception e) { System.out.println(e);}
}
file://CONFIRM Function
void sConfirm(String title,String msg ,String location,JspWriter out){
try{
out.println("<script language=\'javascript\'>");
out.println("if(confirm(/"" + title + "/" + /"//r//n/" + /"" + replace(msg,"/"","///"") + "/")){" );
out.println("var d = (new Date()).toString();");
out.println(location + "+ d;");
out.println("}");
out.println("parent.document.form1.text1.select();");
out.println("</script>");
} catch (Exception e) { }
}
file://得到字符串长度
int getStringLength(String s) {
int p = 0;
try {
int iLength = 0;
int irealLength = 0;
int j = 0;
p = s.getBytes("Shift_JIS").length;
} catch(java.io.UnsupportedEncodingException e) {}
return p;
}
void formatString(String s,int b,JspWriter out){
b--;
String t = "";
try {
int leng = getStringLength(s);
int j = 0;
if (leng > b) {
for (int i = 1; i <= b ; i++) {
t = s.substring(0,i);
if (t.getBytes("Shift_JIS").length <= b ) {
j++;
} else break;
}
file://j = j+1;
file://System.out.println("b=" + b + "----" + "j=" + j);
for(int i = 0;i < j; i++){
if(s.substring(i,i+1).equals(" "))
out.print(" ");
if(!s.substring(i,i+1).equals(" "))
out.print(htmlEncode(s.substring(i,i+1)));
}
if (s.substring(0,j).getBytes("Shift_JIS").length == b){
out.print("|");
}else{
out.print(" |");
}
} else {
for (int i = 0; i < b - leng ; i++)
t = t + " ";
for (int i = 0; i < s.length(); i++){
if(s.substring(i,i+1).equals(" "))
out.print(" ");
if(!s.substring(i,i+1).equals(" "))
out.print(htmlEncode(s.substring(i,i+1)));
}
out.print(htmlEncode(t + "|"));
}
} catch(Exception e){System.out.println("----" + e);}
}
file://判断是否为数字
boolean isNumeric(String number)
{
try
{
Integer.parseInt(number);
return true;
}
catch(NumberFormatException sqo)
{
return false;
}
}
file://判断是否为日期
String mk_date(String c_date,int c_mode)
{
String wk_buf= "";
String ToDay = "";
try
{
ToDay = Integer.toString(java.util.Calendar.getInstance().get(java.util.Calendar.YEAR));
switch(c_mode)
{
case 0:
{
wk_buf = c_date.substring(2, 4) + "/" + c_date.substring(4, 6);
if (c_date.length() == 8)
{
wk_buf = wk_buf + "/" + c_date.substring(6, 8);
}
break;
}
case 1:
{
for (int i=0; i<c_date.length();i++)
{
if (c_date.substring(i, i+1) == " ")
{
wk_buf = wk_buf + "0";
}
else
{
wk_buf = wk_buf + c_date.substring(i, i+1);
}
}
c_date = wk_buf;
wk_buf = "";
if (c_date.substring(0, 1) != "0" )
{
wk_buf = "19";
}
else
{
wk_buf = "20";
}
wk_buf = wk_buf + c_date.substring(0, 2) + c_date.substring(3, 5);
if (c_date.length() == 8)
{
wk_buf = wk_buf + c_date.substring(6, 8);
}
break;
}
case 2:
{
wk_buf = c_date.substring(0, 4) + c_date.substring(5, 7) + c_date.substring(8, 10);
break;
}
case 3:
{
for(int i=0; i<c_date.length();i++ )
{
if (c_date.substring(i, i+1) == " ")
{
wk_buf = wk_buf + "0";
}
else
{
wk_buf = wk_buf + c_date.substring(i, i+1);
}
}
c_date = wk_buf;
wk_buf = "";
if (Integer.parseInt(c_date.substring(0,2)) > Integer.parseInt(ToDay.substring(2, 4)))
{
wk_buf = Integer.toString(Integer.parseInt(ToDay.substring(0,2)) - 1);
}
else
{
wk_buf = ToDay.substring(0,2);
}
wk_buf = wk_buf + c_date.substring(0,2) + c_date.substring(3,5);
if (c_date.length() == 8)
{
wk_buf = wk_buf + c_date.substring(6,8);
}
break;
}
case 4:
{
wk_buf = c_date.substring(0,4) + "/" + c_date.substring(4,6) + "/" + c_date.substring(6, 8);
break;
}
case 5:
{
wk_buf = c_date.substring(0,4) + c_date.substring(5, 7);
break;
}
}
}
catch(Exception e)
{
System.out.println("wrong : " + e);
}
return wk_buf;
}
