Compressed file:
public static boolean oneFileToZip (String sourceFilePath, String [] fileNames, String zipFilePath, String zipName) {// compress the target location where to compress the file name of the array, save the file compression, file compression to save the name
boolean flag = false;
FileInputStream fis = null;
BufferedInputStream bis = null;
FileOutputStream fos = null;
ZipOutputStream zos = null;
File sourceFile = new File(sourceFilePath);
if(sourceFile.exists() == false){
System.out.println ( "compressed file path to be:" + sourceFilePath + "does not exist.");
}else{
try {
File zipFile = new File (zipFilePath + "/" + zipName + "zip."); // create a compressed file saved file
if(zipFile.exists()){
System.out.println ( "exists in the directory named:" + zipFilePath + zipName + ". Zip" + ". Package file"); // for file existence judgment
}else{
File[] sourceFiles = new File[fileNames.length];
for (int i=0;i<fileNames.length;i++){
File file = new File(sourceFilePath+"/"+fileNames[i]);
sourceFiles[i] = file;
}
if(null == sourceFiles || sourceFiles.length<1){
System.out.println ( "there is no need to compress the file");
}else{
fos = new FileOutputStream(zipFile);
zos = new ZipOutputStream(new BufferedOutputStream(fos));
byte[] bufs = new byte[1024*10];
for(int i=0;i<sourceFiles.length;i++){
// Create ZIP entity, and added to the archive
ZipEntry zipEntry = new ZipEntry(sourceFiles[i].getName());
zos.putNextEntry (zipEntry);
// Read the file to be compressed and written to the compressed bag
fis = new FileInputStream(sourceFiles[i]);
bis = new BufferedInputStream(fis, 1024*10);
int read = 0;
while((read=bis.read(bufs, 0, 1024*10)) != -1){
zos.write(bufs,0,read);
}
}
flag = true;
}
}
} catch (FileNotFoundException e) {
e.printStackTrace ();
throw new RuntimeException(e);
} catch (IOException e) {
e.printStackTrace ();
throw new RuntimeException(e);
} finally{
try {
if(null != bis) bis.close();
if(null != zos) zos.close();
} catch (IOException e) {
e.printStackTrace ();
throw new RuntimeException(e);
}
}
}
return flag;
}
Generating a random number within a certain range:
Integer MaxNum = new Integer(Max);
Integer memory = new Integer (Min);
// generates a random number in the range of
DecimalFormat df = new DecimalFormat("#.000");
double x = my + (Math.random () * (MaxNum memory));
String str = df.format(x);
System.out.println(str);
Read and write files in the same directory project (under SpringBoot modify the settings Properties)
public static Boolean setRemoteProperty(String key,String value) {
File directory = new File("");
String FileName = "remoteProject.properties";
try{
String courseFile = directory.getCanonicalPath();
File file = new File(courseFile,FileName);
if(file.isFile()){
// modify the file
Properties prop = new Properties();
prop.load(new FileInputStream(file));
OutputStream fos = new FileOutputStream(file);
prop.setProperty(key.trim(), value.trim());
prop.store(fos, null);
fos.close();
}else{
//Create a file
file.createNewFile();
Properties prop = new Properties();
prop.load(new FileInputStream(file));
OutputStream fos = new FileOutputStream(file);
prop.setProperty(key.trim(), value.trim());
prop.store(fos, null);
fos.close();
}
}catch (IOException e){
e.printStackTrace ();
}
return true;
}