一些非常有用的JAVA常用方法

核心提示：作者:xiaoyou 出处: www.csdn.com <%!stc_RSYB_Name stcRSYName1[];stc_SYB_INF stcSYBINF1[];%><%/* String p = (String) session.getValue("access"); if

　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,""",""");