我是处理json文件的新手。 假设所有文件都包含key1
#include <pthread.h>
#include <nacl_io.h>
...
pthread_t handle_msg_thread;
void *handleMsgThreadFunc(void * data); // Calls function foo()
class MyInstance : public pp::Instance {
public:
explicit MyInstance(PP_Instance instance) :pp::Instance(instance) {
nacl_io_init_ppapi(instance, pp::Module::Get()->get_browser_interface());
pthread_create(&handle_msg_thread, NULL, &handleMsgThreadFunc, NULL);
}
...
}
{"key1":"ab","key2":"cd","key3":"ef"} {"key1":"gh","key4":"ij","key5":"kl"} 现在我想为所有文件制作“key1”：“xyz”，其他键保持该文件中存在的相同值。 我曾尝试过以下代码。
{"key1":"mn","key3":"op","key4":"qr", "key5":"st"}String filePath = "D:\\json"
File folder = new File(filePath);
File[] listOfFiles = folder.listFiles();
for (int i = 0; i < listOfFiles.length; i++)
{
JSONObject js = new JSONObject();
js.remove("key1");
js.put("key1", xyz);
try (FileWriter fw = new FileWriter(filePath+ "\\" + listOfFiles[i].getName())) {
fw.write(js.toString());
}
catch (Exception e) {
e.printStackTrace();
}
}
{"key1":"xyz","key2":"cd","key3":"ef"}其他人都没了。