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java开发常用工具类封装

There is a newer version: 1.1.0

package com.litongjava.utils.projectvariable;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;

public class FileUtil {
  /**
   * 将字符串写如文件
   */
  public static void writeFile(String filePath, String input) throws IOException {
    FileWriter fw = new FileWriter(filePath);
    PrintWriter out = new PrintWriter(fw);
    out.write(input);
    out.println();
    fw.close();
    out.close();
  }

  /**
   * 读取文本文件内容
   */
  public static String readFile(String filePath) throws IOException {
    StringBuffer sb = new StringBuffer();
    readToBuffer(sb, filePath);
    return sb.toString();
  }

  /**
   * 将文本文件中的内容读入到buffer中
   */
  public static void readToBuffer(StringBuffer buffer, String filePath) throws IOException {
    InputStream is = new FileInputStream(filePath);
    String line; // 用来保存每行读取的内容
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    line = reader.readLine(); // 读取第一行
    while (line != null) { // 如果 line 为空说明读完了
      buffer.append(line); // 将读到的内容添加到 buffer 中
      buffer.append("\n"); // 添加换行符
      line = reader.readLine(); // 读取下一行
    }
    reader.close();
    is.close();
  }
}