java生成文件/插入数据

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;


public class C1 {
    private static String path="E:\file\";
    private static String filenameTemp;
    public static boolean createFile(String fileName)
    {
    Boolean bool=false;
    filenameTemp=path+fileName+".txt";
    File file = new File(filenameTemp);
    try {
        if(!file.exists()){
            file.createNewFile();
            bool=true;
            System.out.println("success create file,the file is "+ filenameTemp);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return bool;
    }
    
    //写入内容：
    /**
     * 向文件中写入内容
     * @param filepath 文件路径与名称
     * @param newstr  写入的内容
     * @return
     * @throws IOException
     */
     public static boolean writeFileContent(String filepath,String newstr) throws IOException{
            Boolean bool = false;
            String filein = newstr+"
";//新写入的行，换行
            String temp  = "";
            
            FileInputStream fis = null;
            InputStreamReader isr = null;
            BufferedReader br = null;
            FileOutputStream fos  = null;
            PrintWriter pw = null;
            try {
                File file = new File(filepath);//文件路径(包括文件名称)
                //将文件读入输入流
                fis = new FileInputStream(file);
                isr = new InputStreamReader(fis);
                br = new BufferedReader(isr);
                StringBuffer buffer = new StringBuffer();
                
                //文件原有内容
                for(int i=0;(temp =br.readLine())!=null;i++){
                    buffer.append(temp);
                    // 行与行之间的分隔符 相当于“
”
                    buffer = buffer.append(System.getProperty("line.separator"));
                }
                buffer.append(filein);
                
                fos = new FileOutputStream(file);
                pw = new PrintWriter(fos);
                pw.write(buffer.toString().toCharArray());
                pw.flush();
                bool = true;
                System.out.println("Insert data successfully.");


            } catch (Exception e) {
                // TODO: handle exception
                e.printStackTrace();
            }finally {
                //不要忘记关闭
                if (pw != null) {
                    pw.close();
                }
                if (fos != null) {
                    fos.close();
                }
                if (br != null) {
                    br.close();
                }
                if (isr != null) {
                    isr.close();
                }
                if (fis != null) {
                    fis.close();
                }
            }
            return bool;
        }
        
//        /**
//         * 删除文件
//         * @param fileName 文件名称
//         * @return
//         */
        public static boolean delFile(String fileName){
            Boolean bool = false;
            filenameTemp = path+fileName+".txt";
            File file  = new File(filenameTemp);
            try {
                if(file.exists()){
                    file.delete();
                    bool = true;
                    System.out.println("success delete file,the file is " + filenameTemp);

                }
            } catch (Exception e) {
                // TODO: handle exception
            }
            return bool;
        }
        
    
    
    public static void main(String[] args) throws IOException
    {
        createFile("james");
//        delFile("james");
        writeFileContent("E:\file\james.txt","插入数据啦");
    }
}