java 将字符串写入到文本文件

￡神魔★判官ぃ 2022-06-08 12:22 312阅读 0赞

**简单的写入方法一：**

import [java.io][].FileWriter;  
import [java.io][].IOException;  
  
public class TestFile \{   
public static void main(String\[\] args) \{   
StringBuffer sb=new StringBuffer();  
sb.append("12345\\n");  
sb.append("abcde\\n");  
sb.append("123.abc");  
try \{   
FileWriter fw=new FileWriter("c:/test.txt");  
fw.write(sb.toString());  
fw.close();  
\} catch (IOException e) \{   
e.printStackTrace();

\}  
\}  
\}

简单写入方法二：

`import` `java.io.*;`

`public` `class` `C {`

`` `public` `static` `void` `main( String[ ] args )` `throws` `Exception {`

`` `PrintWriter pw =` `new` `PrintWriter(` `new` `FileWriter(` `"D:\\写入文字.txt"` `) );`

`` `pw.print(` `"百度知道"` `);`

`//pw.append("百度知道")`

`` `pw.close();`

`` `}`

`}`

**复杂的写入 ：**

import java.io.BufferedReader;  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.InputStreamReader;  
import java.io.PrintWriter;  
import java.util.UUID;  
  
public class ForFile \{  
//生成文件路径  
private static String path = "D:\\\\file\\\\";  
  
//文件路径+名称  
private static String filenameTemp;  
/\*\*  
\* 创建文件  
\* @param fileName 文件名称  
\* @param filecontent 文件内容  
\* @return 是否创建成功，成功则返回true  
\*/  
public static boolean createFile(String fileName,String filecontent)\{  
Boolean bool = false;  
filenameTemp = path+fileName+".txt";//文件路径+名称+文件类型  
File file = new File(filenameTemp);  
try \{  
//如果文件不存在，则创建新的文件  
if(!file.exists())\{  
file.createNewFile();  
bool = true;  
System.out.println("success create file,the file is "+filenameTemp);  
//创建文件成功后，写入内容到文件里  
writeFileContent(filenameTemp, filecontent);  
\}  
\} catch (Exception e) \{  
e.printStackTrace();  
\}  
  
return bool;  
\}  
  
/\*\*  
\* 向文件中写入内容  
\* @param filepath 文件路径与名称  
\* @param newstr 写入的内容  
\* @return  
\* @throws IOException  
\*/  
public static boolean writeFileContent(String filepath,String newstr) throws IOException\{  
Boolean bool = false;  
String filein = newstr+"\\r\\n";//新写入的行，换行  
String temp = "";  
  
FileInputStream fis = null;  
InputStreamReader isr = null;  
BufferedReader br = null;  
FileOutputStream fos = null;  
PrintWriter pw = null;  
try \{  
File file = new File(filepath);//文件路径(包括文件名称)  
//将文件读入输入流  
fis = new FileInputStream(file);  
isr = new InputStreamReader(fis);  
br = new BufferedReader(isr);  
StringBuffer buffer = new StringBuffer();  
  
//文件原有内容  
for(int i=0;(temp =br.readLine())!=null;i++)\{  
buffer.append(temp);  
// 行与行之间的分隔符 相当于“\\n”  
buffer = buffer.append(System.getProperty("line.separator"));  
\}  
buffer.append(filein);  
  
fos = new FileOutputStream(file);  
pw = new PrintWriter(fos);  
pw.write(buffer.toString().toCharArray());  
pw.flush();  
bool = true;  
\} catch (Exception e) \{  
// TODO: handle exception  
e.printStackTrace();  
\}finally \{  
//不要忘记关闭  
if (pw != null) \{  
pw.close();  
\}  
if (fos != null) \{  
fos.close();  
\}  
if (br != null) \{  
br.close();  
\}  
if (isr != null) \{  
isr.close();  
\}  
if (fis != null) \{  
fis.close();  
\}  
\}  
return bool;  
\}  
  
/\*\*  
\* 删除文件  
\* @param fileName 文件名称  
\* @return  
\*/  
public static boolean delFile(String fileName)\{  
Boolean bool = false;  
filenameTemp = path+fileName+".txt";  
File file = new File(filenameTemp);  
try \{  
if(file.exists())\{  
file.delete();  
bool = true;  
\}  
\} catch (Exception e) \{  
// TODO: handle exception  
\}  
return bool;  
\}  
public static void main(String\[\] args) \{  
UUID uuid = UUID.randomUUID();  
createFile(uuid+"myfile", "我的梦说别停留等待,就让光芒折射泪湿的瞳孔,映出心中最想拥有的彩虹,带我奔向那片有你的天空,因为你是我的梦 我的梦");  
\}  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
\}

[java.io]: https://www.baidu.com/s?wd=java.io&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y3nWRLPH7-nWIhnAP-uAms0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHRdnWnkPHTs