<%
try {
FileReader fr=new FileReader(request.getRealPath("/")+"\\counter.txt");
BufferedReader br=new BufferedReader(fr);
String countno = br.readLine();
if (countno == null) {
FileWriter fw=new FileWriter(request.getRealPath("/")+"\\counter.txt");
PrintWriter pw=new PrintWriter(fw);
pw.print("1");
pw.close();
fw.close();
}
else{
out.println("本页面是第"+countno+"次被访问!!");
FileWriter fw=new FileWriter(request.getRealPath("/")+"\\counter.txt");
PrintWriter pw=new PrintWriter(fw);
pw.print(String.valueOf(Integer.parseInt(countno)+1));
pw.close();
fw.close();
}}
catch(Exception e){
FileWriter fw=new FileWriter(request.getRealPath("/")+"\\counter.txt");
PrintWriter pw=new PrintWriter(fw);
pw.print("1");
out.println("本页面是第"+1+"次被访问!!");
pw.close();
fw.close();
}
%>
为什么代码中的PrintWriter()不能用BufferedWriter()代替呢?
他们之间有什么区别?
try {
FileReader fr=new FileReader(request.getRealPath("/")+"\\counter.txt");
BufferedReader br=new BufferedReader(fr);
String countno = br.readLine();
if (countno == null) {
FileWriter fw=new FileWriter(request.getRealPath("/")+"\\counter.txt");
PrintWriter pw=new PrintWriter(fw);
pw.print("1");
pw.close();
fw.close();
}
else{
out.println("本页面是第"+countno+"次被访问!!");
FileWriter fw=new FileWriter(request.getRealPath("/")+"\\counter.txt");
PrintWriter pw=new PrintWriter(fw);
pw.print(String.valueOf(Integer.parseInt(countno)+1));
pw.close();
fw.close();
}}
catch(Exception e){
FileWriter fw=new FileWriter(request.getRealPath("/")+"\\counter.txt");
PrintWriter pw=new PrintWriter(fw);
pw.print("1");
out.println("本页面是第"+1+"次被访问!!");
pw.close();
fw.close();
}
%>
为什么代码中的PrintWriter()不能用BufferedWriter()代替呢?
他们之间有什么区别?
解决方案 »
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