IOutils工具类

package com.test.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;


public class IOUtils {
    private IOUtils() {
    }

    public static String readInputStreamToString(InputStream stream, Charset charset) throws IOException {
        char[] buffer = new char[1024];
        StringBuilder out = new StringBuilder();
        InputStreamReader in = new InputStreamReader(stream, charset);

        while (true) {
            int rsz = in.read(buffer, 0, buffer.length);
            if (rsz < 0) {
                return out.toString();
            }

            out.append(buffer, 0, rsz);
        }
    }

    public static String readFileToString(File file, Charset charset) throws IOException {
        return readInputStreamToString(new FileInputStream(file), charset);
    }
}