Java中如何通过txt文件存储和取出数据?

Python045

Java中如何通过txt文件存储和取出数据?,第1张

Java中读取txt文件可以使用file类先创建一个对象，然后使用I/O操作，进行读取或者写入操作，示例如下：\x0d\x0aimportjava.io.BufferedReader\x0d\x0aimportjava.io.File\x0d\x0aimportjava.io.FileInputStream\x0d\x0aimportjava.io.FileNotFoundException\x0d\x0aimportjava.io.FileOutputStream\x0d\x0aimportjava.io.IOException\x0d\x0aimportjava.io.InputStreamReader\x0d\x0aimportjava.io.PrintWriter\x0d\x0a\x0d\x0apublicclassdemo2{\x0d\x0aprivatestaticStringpath="f:/demo1.txt"\x0d\x0aprivatestaticFilefile\x0d\x0astatic{\x0d\x0afile=newFile(path)\x0d\x0aif(!file.exists()){\x0d\x0atry{\x0d\x0afile.createNewFile()\x0d\x0a}catch(IOExceptione){\x0d\x0ae.printStackTrace()\x0d\x0a}\x0d\x0a}\x0d\x0a}\x0d\x0a\x0d\x0apublicstaticvoidmain(String[]args)throwsIOException{\x0d\x0aStudentstu=newStudent(1,"张三",90)\x0d\x0awriteDataToFile(file,stu)\x0d\x0areadDataFromFile(file)\x0d\x0a}\x0d\x0a\x0d\x0aprivatestaticvoidreadDataFromFile(Filefile)throwsIOException{\x0d\x0aBufferedReaderreader=newBufferedReader(newInputStreamReader(newFileInputStream(file)))\x0d\x0aStringstr=""\x0d\x0awhile((str=reader.readLine())!=null){\x0d\x0aString[]stuInfo=str.split(",")\x0d\x0aSystem.out.println("学号："+stuInfo[0]+"姓名："+stuInfo[1]+"score："+stuInfo[2])\x0d\x0a}\x0d\x0a}\x0d\x0a\x0d\x0aprivatestaticvoidwriteDataToFile(Filefile,Studentstu)throwsFileNotFoundException{\x0d\x0aPrintWriterout=newPrintWriter(newFileOutputStream(file,true))\x0d\x0aout.println(stu.toString())\x0d\x0aout.close()\x0d\x0a}\x0d\x0a}

importjava.io.BufferedReader\x0d\x0aimportjava.io.File\x0d\x0aimportjava.io.FileReader\x0d\x0aimportjava.io.IOException\x0d\x0a\x0d\x0apublicclassReadFile{\x0d\x0a\x0d\x0apublicstaticvoidmain(String[]args)throwsIOException{\x0d\x0a\x0d\x0aStringfileContent=readFileContent("")\x0d\x0a\x0d\x0aSystem.out.println(fileContent)\x0d\x0a}\x0d\x0a\x0d\x0a//参数string为你的文件名\x0d\x0aprivatestaticStringreadFileContent(StringfileName)throwsIOException{\x0d\x0a\x0d\x0aFilefile=newFile(fileName)\x0d\x0a\x0d\x0aBufferedReaderbf=newBufferedReader(newFileReader(file))\x0d\x0a\x0d\x0aStringcontent=""\x0d\x0aStringBuildersb=newStringBuilder()\x0d\x0a\x0d\x0awhile(content!=null){\x0d\x0acontent=bf.readLine()\x0d\x0a\x0d\x0aif(content==null){\x0d\x0abreak\x0d\x0a}\x0d\x0a\x0d\x0asb.append(content.trim())\x0d\x0a}\x0d\x0a\x0d\x0abf.close()\x0d\x0areturnsb.toString()\x0d\x0a}\x0d\x0a}