怎么样循环读出文本文件里的所有数据？

[AaddB]

File file = new File(request.getRealPath("test")+"/byo.txt");
if(file.exists())
{
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr) ;
String str="";
while(!br.Next())
{
str=br.readLine();
out.println(str);
}
}
这里哪儿不对呀？谢谢

[Andrawu]

/**
* Returns the content of the file in a String.
* If an error occurs, like if the file does not exists, null is returned.
*/
public String getContent() {
String content = "";
File file = new File(fileName);
if (!file.exists()) {
setErrorMessage("Error: The file '" + fileName + "' does not exists.");
return null;
}
else if (file != null) {
try {
// Create an BufferedReader so we can read a line at the time.
BufferedReader reader = new BufferedReader(new FileReader(file));
String inLine = reader.readLine();
while (inLine != null) {
if (inLine.length() + 1 > columns)
columns = inLine.length() + 1;
content += (inLine + System.getProperty("line.separator"));
inLine = reader.readLine();
rowCount++;
}
return content;
}
catch (IOException e) {
setErrorMessage("Error reading the file: " + e.getMessage());
return null;
}
}
else {
setErrorMessage("Unknown error!");
return null;
}
}
}

[希偌]

File file = new File(request.getRealPath("test")+"/byo.txt");
if(file.exists())
{
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr) ;
String str="";
while(str!=null)
{
str=br.readLine();
out.println(str+"<br>");
}
}
%>

[希偌]

楼上的有点问题，这样：
File file = new File(request.getRealPath("test")+"/byo.txt");
if(file.exists())
{
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr);
String str=br.readLine();
while(str!=null)
{
out.println(str+"<br>");
str=br.readLine();
}
}