在Java ME中读取行 [英] Read lines in Java ME
本文介绍了在Java ME中读取行的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
InputStream
中读取一行吗?解决方案
'或'\r\\\'结尾。下面的类将处理所有这些情况。
public class LineReader {
private Reader in;
private int bucket = -1;
public LineReader(Reader in){
this.in = in;
public boolean hasLine()抛出IOException {
if(bucket!= - 1)return true;
bucket = in.read();
return bucket!= - 1;
}
//读取一行,删除/ r和/ n。缓冲字符串
public String readLine()throws IOException {
int tmp;
StringBuffer out = new StringBuffer();
//读入数据
while(true){
//首先检查桶。如果为空,则从输入流中读取
if(bucket!= - 1){
tmp = bucket;
bucket = -1;
} else {
tmp = in.read();
if(tmp == - 1)break;
}
//如果换行,则放弃它。如果我们得到一个\r,我们需要向前看,所以可以使用桶
if(tmp =='\r'){
int nextChar = in.read();
if(tmp!='\\\
')bucket = nextChar; //忽略\r\\\
,而不是\r\r
break;
} else if(tmp =='\\\
'){
break;
} else {
//否则直接附加字符
out.append((char)tmp);
}
}
返回out.toString();
}
}
Does Java ME allow you to read a line from an InputStream
?
解决方案
This is not as trivial as it sounds. Unfortunately, lines could end with '\r', '\n' or '\r\n'. The following class will handle all of these cases.
public class LineReader{
private Reader in;
private int bucket=-1;
public LineReader(Reader in){
this.in=in;
}
public boolean hasLine() throws IOException{
if(bucket!=-1)return true;
bucket=in.read();
return bucket!=-1;
}
//Read a line, removing any /r and /n. Buffers the string
public String readLine() throws IOException{
int tmp;
StringBuffer out=new StringBuffer();
//Read in data
while(true){
//Check the bucket first. If empty read from the input stream
if(bucket!=-1){
tmp=bucket;
bucket=-1;
}else{
tmp=in.read();
if(tmp==-1)break;
}
//If new line, then discard it. If we get a \r, we need to look ahead so can use bucket
if(tmp=='\r'){
int nextChar=in.read();
if(tmp!='\n')bucket=nextChar;//Ignores \r\n, but not \r\r
break;
}else if(tmp=='\n'){
break;
}else{
//Otherwise just append the character
out.append((char) tmp);
}
}
return out.toString();
}
}
这篇关于在Java ME中读取行的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文