1、java保存json格式数据,保存字符串和读取字符串
import java.io.*;
class RWJson {
public void wiite(String s, String toString) {
BufferedWriter writer = null;
File file = new File(s);
//如果文件不存在,则新建一个
if(!file.exists()){
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
//写入
try {
writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file,false), "UTF-8"));
writer.write(toString);
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
if(writer != null){
writer.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
System.out.println("文件写入成功!");
}
public String readJson(String fileName) {
BufferedReader reader = null;
StringBuilder laststr = new StringBuilder();
try {
FileInputStream fileInputStream = new FileInputStream(fileName);
InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "UTF-8");
reader = new BufferedReader(inputStreamReader);
String tempString = null;
while ((tempString = reader.readLine()) != null) {
laststr.append(tempString);
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return laststr.toString();
}
}