IO流读写文本文件

IO流读写文本文件

import java.io.BufferedReader;
import java.io.FileReader;

public class ReadFile {
FileReader reader = null;
String filePath = "";
BufferedReader br = null;

public ReadFile(String filePath) throws Exception{
this.filePath = filePath;
reader = new FileReader(filePath);
br = new BufferedReader(reader);
}

public void initReader() throws Exception{
reader = new FileReader(filePath);
br = new BufferedReader(reader);
}
//读文件的一行
public String readLine() throws Exception{
String lineString = "";
if((lineString = br.readLine()) != null){
return lineString;
}
return null;
}
//读整个文件
public String readFileToString() throws Exception{
String lineString = "";
StringBuffer buffer = new StringBuffer();
while((lineString = br.readLine()) != null){
buffer.append(lineString).append("/n");
}
return buffer.toString();
}

public void closeReader() throws Exception{
br.close();
reader.close();
}

public String getFilePath() {
return filePath;
}

public void setFilePath(String filePath) {
this.filePath = filePath;
}

//写文件

public static void write(String path, String content) {
String s = new String();
String s1 = new String();
try {
File f = new File(path);
if (f.exists()) {
System.out.println("文件存在");
} else {
System.out.println("文件不存在，正在创建...");
if (f.createNewFile()) {
System.out.println("文件创建成功！");
} else {
System.out.println("文件创建失败！");
}

}
BufferedReader input = new BufferedReader(new FileReader(f));

while ((s = input.readLine()) != null) {
s1 += s + "/n";
}
System.out.println("文件内容：" + s1);
input.close();
s1 += content;

BufferedWriter output = new BufferedWriter(new FileWriter(f));
output.write(s1);
output.close();
} catch (Exception e) {
e.printStackTrace();
}
}

}

 

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