Json读写本地文件实现代码

import java.io.*;

/**
 * created by tang on 14-3-1.
 */
public class jsonutils {

    //从给定位置读取json文件
    public static string readjson(string path){
        //从给定位置获取文件
        file file = new file(path);
        bufferedreader reader = null;
        //返回值,使用stringbuffer
        stringbuffer data = new stringbuffer();
        //
        try {
            reader = new bufferedreader(new filereader(file));
            //每次读取文件的缓存
            string temp = null;
            while((temp = reader.readline()) != null){
                data.append(temp);
            }
        } catch (filenotfoundexception e) {
            e.printstacktrace();
        } catch (ioexception e) {
            e.printstacktrace();
        }finally {
            //关闭文件流
            if (reader != null){
                try {
                    reader.close();
                } catch (ioexception e) {
                    e.printstacktrace();
                }
            }
        }
        return data.tostring();
    }

    //给定路径与json文件，存储到硬盘
    public static void writejson(string path,object json,string filename){
        bufferedwriter writer = null;
        file file = new file(path + filename + ".json");
        //如果文件不存在，则新建一个
        if(!file.exists()){
            try {
                file.createnewfile();
            } catch (ioexception e) {
                e.printstacktrace();
            }
        }
        //写入
        try {
            writer = new bufferedwriter(new filewriter(file));
            writer.write(json.tostring());
        } catch (ioexception e) {
            e.printstacktrace();
        }finally {
            try {
                if(writer != null){
                    writer.close();
                }
            } catch (ioexception e) {
                e.printstacktrace();
            }
        }
//        system.out.println("文件写入成功！");
    }
}