我目前正在开发一个读取，写入，更新，删除json file.i的应用程序，它有4个json文件，即data.json（存储名称，地址，区域，引脚），image.json（存储图像名称） ，location.json（存储latitute，经度）和final.json合并上面的json files.final.json将组合来自3个文件的所有数据来制作单个记录。在一个活动中我需要读取名称，日期，在final.json中存储在不同单选按钮中的所有记录的时间。我无法只读取存储在temp.json中的记录的名称，日期，时间，因为temp.json包含latitute，经度，图像名称，名称，地址，引脚，区域，日期，时间。请帮我做以下操作。我还需要删除temp.json文件中的特定记录。
这是我用来从temp.json读取文本的代码。如何从文件中读取名称，日期，时间。我能够读取所有参数 我的temp.json看起来像
{Record:["latitute":"22.456","longitude":"88.56","image_name":"xyz.jpg","name":"abc","address":"xx","area":""22","pin":"99","date":"03/05/2018" ,"time":"18:08:22"]} {Record:["latitute":"22.456","longitude":"88.56","image_name":"xyz.jpg","name":"abc","address":"xx","area":""22","pin":"99","date":"03/05/2018" ,"time":"18:08:22" ]}
String root = Environment.getExternalStorageDirectory().toString(); //get access to directory path
File myDir = new File(root + "/GeoPark");//create folder in internal storage
myDir.mkdirs();// make directory
File file = new File(myDir, FILENAME);//making a new file in the folder
if(file.exists()) // check if file exist
{
//Read text from file
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
}
}
catch (IOException e) {
//You'll need to add proper error handling here
}
//Set the text
String x=text.toString();
String z=x.replace("{","").replace("date:","").replace("time:","").replace("Record:","").replace("[","").replace("latitude:","").replace("longitude:","").replace("name:","").replace("address:","").replace("pin:","").replace("area:","").replace("image:","").replace("\"","").replace("]","").replace("}","");
String[] y=z.split(",");
//rb1.setText(y[3].toString()+","+y[7].toString()+","+y[8].toString()+""+"");
// rb2.setText(y[11].toString()+","+y[15].toString()+","+y[16].toString());
//rb3.setText(y[19].toString()+","+y[23].toString()+","+y[24].toString());
//rb4.setText(y[27].toString()+","+y[31].toString()+","+y[32].toString());
}
else
{
rb1.setText("Sorry file doesn't exist!!");
}
///////合并代码////
static class CopyFileContent {
public static void main(String[] args) {
JSONObject jsonObj2 = new JSONObject();
try {
// Here we convert Object to JSON
jsonObj2.put("date",a.toString());jsonObj2.put("time",c.toString());// Set the first name/pair
} catch (JSONException ex) {
ex.printStackTrace();
}
String root = Environment.getExternalStorageDirectory().toString(); //get access to directory path
File myDir = new File(root + "/GeoPark");//create folder in internal storage
myDir.mkdirs();// make directory
File destFile = new File(myDir, FILENAME11);//making a new file in the folder
/* Source file, from which content will be copied */
File sourceFile1 = new File(myDir,FILENAME12);
File sourceFile2 = new File(myDir,FILENAME13);
File sourceFile3 = new File(myDir,FILENAME14);
/* destination file, where the content to be pasted */
// File destFile = new File(FILENAME);
/* if file not exist then create one */
if (!destFile.exists()) {
try {
destFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
InputStream input1 = null;
InputStream input2 = null;
InputStream input3 = null;
OutputStream output = null;
InputStream input4=null;
try {
/* FileInputStream to read streams */
input1 = new FileInputStream(sourceFile1);
input2 = new FileInputStream(sourceFile2);
input3 = new FileInputStream(sourceFile3);
/* FileOutputStream to write streams */
output = new FileOutputStream(destFile,true);
byte[] buf = new byte[1024];
int bytesRead;
output.write("{Record:[".getBytes());
while ((bytesRead = input1.read(buf)) > 0) {
output.write(buf, 1, bytesRead);
RandomAccessFile f=new RandomAccessFile(destFile,"rw");
long length=f.length()-2;
f.setLength(length);
length=f.length();
f.close();
output.write(",".getBytes());
}
while ((bytesRead = input2.read(buf)) > 0) {
output.write(buf, 1, bytesRead);
RandomAccessFile f=new RandomAccessFile(destFile,"rw");
long length=f.length()-2;
f.setLength(length);
length=f.length();
f.close();
output.write(",".getBytes());
}
while ((bytesRead = input3.read(buf)) > 0) {
output.write(buf, 1, bytesRead);
RandomAccessFile f=new RandomAccessFile(destFile,"rw");
long length=f.length()-2;
f.setLength(length);
length=f.length();
f.close();
output.write(",".getBytes());
output.write(jsonObj2.toString().getBytes());
output.write("]}".getBytes());
output.write("\r\n".getBytes());
output.write("\r\n".getBytes());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
finally {
try {
if (null != input1) {
input1.close();
}
if (null != input2) {
input2.close();
}
if (null != input3) {
input3.close();
}
if (null != output) {
output.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}