1、首先看一下File中参数的集中形式
①//构造函数File(String pathname)
File f1 = new File("c:\\1.txt");
②//File(String parent,String child)
File f2 = new File("c:\\abc","2.txt");
③//File(File parent,String child)
File f3 =new File("c:"+File.separator+"abc");//separator 是跨平台分隔符
File f4 =new File(f3,"3.txt");
2、File f1 可以定义绝对路径，也可以定义相对路径
3、区分相对和绝对
①绝对路径：
a.带盘符,如E:/book.xml
b.以http开头,/img/book.jpg
②相对路径：
a.带"/"开头,如/book.xml
b.不带"/"开头,如book.xml
4、相对和绝对的校验方式：
public String filter3(String param){
if(param!=null || param!=""){
if(":".equals(param.indexOf(1,2))){//是绝对路径
param = param.replaceAll("../", "").replaceAll("./", "");
String params [] = param.substring(2,param.length()).split("/");
String aa = "";
if(params.length>0){
for(int i=0;i
//正则表达式：/ * : < > ?
Pattern pattern = pile("[\\s\\\\/:\\*\\?\\\"<>\\|]");
Matcher matcher = pattern.matcher(params[i]);
aa += matcher.replaceAll("") + "/" ;
}
}
param = param.substring(0,2) + aa ;
param = param.substring(0,param.length()-1);
}else if("http:".equals(param.toLowerCase().indexOf(0,5))){
param = param.replaceAll("../", "").replaceAll("./", "");
String params [] = param.substring(5,param.length()).split("/");
String aa = "";
if(params.length>0){
for(int i=0;i
//正则表达式：/ * : < > ?
Pattern pattern = pile("[\\s\\\\/:\\*\\?\\\"<>\\|]");
Matcher matcher = pattern.matcher(params[i]);
aa += matcher.replaceAll("") + "/" ;
}
}
param = param.substring(0,5) + aa ;
param = param.substring(0,param.length()-1);
}else{//是相对路径
param = param.replaceAll(":", "");
String params [] = param.substring(5,param.length()).split("/");
String aa = "";
if(params.length>0){
for(int i=0;i
//正则表达式：/ * : < > ?
Pattern pattern = pile("[\\s\\\\/:\\*\\?\\\"<>\\|]");
Matcher matcher = pattern.matcher(params[i]);
aa += matcher.replaceAll("") + "/" ;
}
}
param = param.substring(0,5) + aa ;
param = param.substring(0,param.length()-1);
}
}
return param;
}
