java读取json文件并转换为String

import java.io.*;


public class Output {
	//测试
	public static void main(String[] args){
		String json = "null";
		try {
			json = readJsonData("I:\\History_Project\\echarts\\life-expectancy.json");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println(json);
	}
	
	public static String readJsonData(String pactFile) throws IOException {
		// 读取文件数据
		//System.out.println("读取文件数据util");
		
		StringBuffer strbuffer = new StringBuffer();
		File myFile = new File(pactFile);//"D:"+File.separatorChar+"DStores.json"
		if (!myFile.exists()) {
			System.err.println("Can't Find " + pactFile);
		}
		try {
			FileInputStream fis = new FileInputStream(pactFile);
			InputStreamReader inputStreamReader = new InputStreamReader(fis, "UTF-8");
			BufferedReader in  = new BufferedReader(inputStreamReader);
			
			String str;
			while ((str = in.readLine()) != null) {
				strbuffer.append(str);  //new String(str,"UTF-8")
			}
			in.close();
		} catch (IOException e) {
			e.getStackTrace();
		}
		//System.out.println("读取文件结束util");
		return strbuffer.toString();
	}
	
}