标签：date() exception 一个 说明 acl string 文件内容 AC ace
该类是字节输出流的抽象类，定义了输出流的各种操作方法。如下图是OutputStream的层次结构：
new ByteArrayOutputStream();
new ByteArrayOutputStream(int size); //size表示初始化字节数组缓冲区的大小
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bos.write(‘q‘);
bos.write(‘a‘); //将字节写入该字符数组
bos.reset(); //重置该字节数组，即将如上写入的‘q‘ ‘a‘字节清空
byte[] b = {‘a‘,‘b‘,‘c‘,‘d‘,‘e‘,‘f‘,‘g‘,‘h‘,‘i‘,‘j‘,‘k‘,‘l‘,‘m‘,‘n‘};
bos.write(b, 1, 7); //从b数组的第一个下标连续写入长度为7个字符
try {
FileOutputStream fs = new FileOutputStream("SourceFile/employee");
bos.writeTo(fs); //将字符数组写入文档
fs.close();
bos.flush();
bos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
FileOutputStream fs1 = new FileOutputStream(FileDescriptor.out);
FileOutputStream fs2 = new FileOutputStream(new File("SourceFile/employee"), true); //在该文件的末尾添加内容
fs1.write("https://www.cnblogs.com/zhanglei93/".getBytes()); //write()方法可以写入byte数组、int
fs1.close();
fs2.write("https://www.cnblogs.com/zhanglei93/".getBytes());
fs2.flush(); //清空缓存里的数据，并通知底层去进行实际的写操作
fs2.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new BufferedOutputStream(OutputStream)
new BufferedOutputStream(OutputStream,int) //int的值规定了byte数组的大小
try {
FileOutputStream fs = new FileOutputStream("SourceFile/employee");
BufferedOutputStream bos = new BufferedOutputStream(fs);
bos.write("https://www.cnblogs.com/zhanglei93/".getBytes()); //write()方法可以写入byte数组、int
fs.close();
bos.flush();
bos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new PrintStream(File);
new PrintStream(OutputStream);
new PrintStream(String); //文件路径及名称
new PrintStream(File, String); //String 编码格式
new PrintStream(OutputStream, boolean); //是否自动刷新
new PrintStream(OutputStream, boolean, String); //是否自动刷新、编码格式
new PrintStream(String, String); //文件路径及名称、编码格式
关于该类的详细说明见：http://www.cnblogs.com/skywang12345/p/io_16.html
该类是字符输出流的抽象类，定义了输出流的各种操作方法。如下图是Writer的层次结构：
new BufferedWriter(Writer)
new BufferedWriter(Writer, int) //int大小为默认数组的大小
try {
BufferedWriter bw = new BufferedWriter(new FileWriter("SourceFile/employee"));
bw.write("http://www.cnblogs.com/zhanglei93/".toCharArray()); //写入char数组
bw.write("http://www.cnblogs.com/zhanglei93/"); //写入String,还可以写入int
CharSequence csq = "http://www.cnblogs.com/zhanglei93/p/5846592.html";
bw.append(csq, 0, 34);
bw.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
new CharArrayWriter();
new CharArrayWriter(int);
CharArrayWriter cw = new CharArrayWriter(5);
for(Employee e : employees){
try {
cw.write(e.getName());
cw.append(e.getSalary() + "");
cw.write(e.getDate().toString() + "\r\n");
FileWriter fw = new FileWriter("SourceFile/employee");
cw.writeTo(fw);
fw.close();
cw.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
new FileWriter(File)
new FileWriter(FileDescriptor)
new FileWriter(String)
new FileWriter(File, boolean)
new FileWriter(String, boolean)
具体的使用方法见:http://docs.oracle.com/javase/8/docs/api/java/io/FileWriter.html
具体见：http://docs.oracle.com/javase/7/docs/api/java/io/PrintWriter.html
PrintWriter pw = null;
/**
* PrintWriter(String fileName, String csn)
* 创建具有指定文件名称和字符集且不带自动行刷新的新 PrintWriter。如不执行pw.close()则不刷新文件内容
* @param name
* @param code
* @param employees
*/
public void writeData(String name, String code, Employee[] employees){
try {
pw = new PrintWriter(name, code);
writeToFile(pw, employees);
pw.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* PrintWriter(Writer out, boolean autoFlush)
* 创建新 PrintWriter, flag = true表示能自动刷新,即不执行pw.close()也会自动刷新内容到文件
* @param write
* @param flag
* @param employees
*/
public void writeData(Writer write, boolean flag, Employee[] employees){
pw = new PrintWriter(write, flag);
writeToFile(pw, employees);
pw.close();
}
private void writeToFile(PrintWriter pw, Employee[] employees){
pw.println(employees.length);
for(Employee e : employees)
e.writeEmployee(pw);
}
标签：date() exception 一个 说明 acl string 文件内容 AC ace
原文地址：https://www.cnblogs.com/cxhfuujust/p/9129635.html
