通过IO文件流读取 修改build.prop配置文件

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class ConfigModify {

    public static void main(String[] args)  {
        
        File file = new File("c:\\build.prop");
        if(file.exists()){
            System.out.println("build.prop配置文件存在...");
            //得到文件流
            FileInputStream fin = null;
            BufferedReader reader = null;
            //以行为单位，将字符串放入数组
            String[] array = null;
            //原始配置信息字符串
            String originalContent = null;
            try{
                fin = new FileInputStream(file);
                reader = new BufferedReader(new InputStreamReader(fin));
            
                StringBuilder sb = new StringBuilder();
                String str = "";
                while((str = reader.readLine())!=null){
                    sb.append(str+"\n");
                }
                originalContent = sb.toString();
                reader.close();
                fin.close();    //关闭文件流
                System.out.println("读取原始配置信息成功...");
                System.out.println("关闭文件输入流...");
                
                
            }catch (FileNotFoundException e) {
                e.printStackTrace();
            }catch (IOException e) {
                e.printStackTrace();
            }catch (Exception e) {
                e.printStackTrace();
            }
            
            //以换行为分隔 返回字符串数组
            array = originalContent.split("\n");
            for (int i = 0; i < array.length; i++) {
                if(array[i].contains("ro.product.model")){
                    array[i] = "ro.product.model=iPhone 6 Plus";
                }else if(array[i].contains("ro.product.brand")){
                    array[i] = "ro.product.brand=iPhone";
                }else if(array[i].contains("ro.product.board")){
                    array[i] = "ro.product.brand=iPhone";
                }else if(array[i].contains("ro.product.manufacturer")){
                    array[i] = "ro.product.manufacturer=iPhone";
                }else {
                    
                }
            }
            
            
            FileOutputStream fos = null;
            BufferedWriter writer = null;
            try {
                StringBuilder sBuilder = new StringBuilder();
                for (int i = 0; i < array.length; i++) {
                    sBuilder.append(array[i]+"\n");
                }
                
                String finalMsg =  sBuilder.toString();
                System.out.println("######################");
                
                fos = new FileOutputStream(file);
                writer = new BufferedWriter(new OutputStreamWriter(fos));
                
                writer.append(finalMsg);
                writer.flush();
                writer.close();
                System.out.println("替换配置信息成功...");
                System.out.println("写入新配置信息成功...");
                System.out.println("关闭文件输出流...");
                fos.close();
            }catch (FileNotFoundException e) {
                e.printStackTrace();
            }catch (IOException e) {
                e.printStackTrace();
            }catch (Exception e) {
                e.printStackTrace();
            }
        }else {
            System.out.println("build.prop file is not exist");
        }
    }
}