代码语言：javascript
复制 try {
FileOutputStream fileOutputStream = new FileOutputStream(file.getPath());
byte[] bytes = aa.getBytes();
try {
fileOutputStream.write(bytes);
fileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
代码语言：javascript
复制 try {
FileInputStream fileInputStream = new FileInputStream(file.getPath());
byte[] bytes = new byte[1024 * 8];
int ch;
while ((ch = fileInputStream.read(bytes))!=-1){
System.out.println(new String(bytes,0,ch));
}
} catch (Exception e) {
e.printStackTrace();
}
代码语言：javascript
复制 try {
FileWriter fileWriter = new FileWriter(file.getPath() ,true);
BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
bufferedWriter.write("222222222222222222222222");
bufferedWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
代码语言：javascript
复制 try {
FileReader fileReader = new FileReader(file.getPath());
char[] bytes = new char[1024 * 8];
int ch;
while ((ch = fileReader.read(bytes))!=-1){
System.out.println(new String(bytes,0,ch));
}
} catch (Exception e) {
e.printStackTrace();
}
代码语言：javascript
复制 File file =new File("E:\Win10.ios");
if (!file.exists()){
file.exists();
}
new Thread(new Runnable() {
RandomAccessFile rwd;
int cv;
@Override
public void run() {
try {
URL url = new URL("");
try {
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("GET");
//从上次下载完成的地方下载
int start =(int) file.length();
//设置下载位置(从服务器上取要下载文件的某一段)
httpURLConnection.setRequestProperty("Range", "bytes=" file.length() "-" getlength(url.toString());//设置下载范围
//设置文件写入位置
rwd = new RandomAccessFile(file, "rwd");
//从文件的某一位置开始写入
rwd.seek(start);
httpURLConnection.connect();
if (httpURLConnection.getResponseCode()==206){
InputStream inputStream = httpURLConnection.getInputStream();
byte[] bytes = new byte[1024 * 8];
int ch;
while ((ch = inputStream.read(bytes)) != -1){
rwd.write(bytes,0,ch);
cv = ch;
}
inputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
}).start();
}
public static int getlength(String url){
int Length = 0;
try {
URL url1 = new URL(url);
try {
HttpURLConnection httpURLConnection = (HttpURLConnection) url1.openConnection();
httpURLConnection.setRequestMethod("GET");
httpURLConnection.connect();
if (httpURLConnection.getResponseCode() ==HttpURLConnection.HTTP_OK){
Length = httpURLConnection.getContentLength();
}
} catch (IOException e) {
e.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
}
return Length;
}
