我是spring的新手，我正在开发一个相当简单的REST API。
我收到的请求没有任何数据，我需要发回一些信息。这样做的更好方法是什么？
实体
@RequestMapping(value = "/ping", consumes = "application/json", method = RequestMethod.GET)
public ResponseEntity<?> checkServerStatus() throws Exception {
Ping ping = new Ping();
ping.setStatus("alive");
ping.setVersion("v1");
try {
return ResponseEntity.ok().body(ping);
} catch (Exception e) {
throw new Exception("Service is not reachable at the moment", e);
}
}
OR
回复
@RequestMapping(value = "/ping2", consumes = "application/json", method = RequestMethod.GET)
public ResponseEntity<?> checkServerStatus2() throws Exception {
try {
return ResponseEntity.ok(new PingResponse("alive", "v1"));
} catch (Exception e) {
throw new Exception("Service is not reachable at the moment", e);
}
}
我认为无需显示PingResponse和Ping。它们是典型的get/set类。
如果两种方法都不理想，那么也许有更好的方法呢？
答案 0 :(得分：1)
唯一的区别是您是否将对象放在try块中。并且PingResponse 可能是一个不可变的对象（无设置器）。
实体/响应？它们都是对象。
因此，在您提供的代码示例中没有什么值得关注的地方。
答案 1 :(得分：1)
从您的示例看来，您只需要让呼叫者知道您的服务已启动。为什么要创建对象？您可以只通知呼叫者。
return new ResponseEntity<>("success", HttpStatus.OK);
答案 2 :(得分：-1)
您可以只从后端返回对象
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
mAuth = FirebaseAuth.getInstance();
currentUserID = mAuth.getCurrentUser().getUid();
RootRef = FirebaseDatabase.getInstance().getReference();
UserProfileImageRef = FirebaseStorage.getInstance().getReference().child("Profile Images");
InitializeFields();
userName.setVisibility(View.INVISIBLE);
UpdateAccountSettings.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
UpdateSettings();
}
});
RetrieveUserInfo();
userProfileImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent galleryIntent = new Intent();
galleryIntent.setAction(Intent.ACTION_GET_CONTENT);
galleryIntent.setType("image/*");
startActivityForResult(galleryIntent, GalleryPick);
}
});
}
private void UpdateSettings() {
String setUserName = userName.getText().toString();
String setUserStatus = userStatus.getText().toString();
if (TextUtils.isEmpty(setUserName)) {
Toast.makeText(this, "Please write your user name first....", Toast.LENGTH_SHORT).show();
}
if (TextUtils.isEmpty(setUserStatus)) {
Toast.makeText(this, "Please write your status....", Toast.LENGTH_SHORT).show();
}
else {
HashMap<String, String> profileMap = new HashMap<>();
profileMap.put("uid", currentUserID);
profileMap.put("name", setUserName);
profileMap.put("status", setUserStatus);
profileMap.put("image", photoUrl);
RootRef.child("Users").child(currentUserID).setValue(profileMap)
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()) {
SendUserToMainActivity();
Toast.makeText(SettingsActivity.this, "Profile Updated successfully", Toast.LENGTH_SHORT).show();
} else {
String message = task.getException().toString();
Toast.makeText(SettingsActivity.this, "Error: " + message, Toast.LENGTH_SHORT).show();
}
}
});
}
}
private void RetrieveUserInfo() {
RootRef.child("Users").child(currentUserID)
.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if ((dataSnapshot.exists()) && (dataSnapshot.hasChild("name") && (dataSnapshot.hasChild("image")))) {
String retrieveUserName = dataSnapshot.child("name").getValue().toString();
String retrieveUserStatus = dataSnapshot.child("status").getValue().toString();
String retrieveProfileImage = dataSnapshot.child("image").getValue().toString();
photoUrl = retrieveProfileImage;
userName.setText(retrieveUserName);
userStatus.setText(retrieveUserStatus);
//Picasso.get().load(retrieveProfileImage).into(userProfileImage);
Picasso.get().load(retrieveProfileImage).resize(100,100).centerCrop().into(userProfileImage);
//Glide.with(SettingsActivity.this).load(retrieveProfileImage).into(userProfileImage);
}
else if ((dataSnapshot.exists()) && (dataSnapshot.hasChild("name"))) {
String retrieveUserName = dataSnapshot.child("name").getValue().toString();
String retrieveUserStatus = dataSnapshot.child("status").getValue().toString();
userName.setText(retrieveUserName);
userStatus.setText(retrieveUserStatus);
}
else {
userName.setVisibility(View.VISIBLE);
Toast.makeText(SettingsActivity.this, "Please set & update your profile information...", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
private void InitializeFields() {
UpdateAccountSettings = (Button) findViewById(R.id.update_settings_button);
userName = (EditText) findViewById(R.id.set_user_name);
userStatus = (EditText) findViewById(R.id.set_profile_status);
userProfileImage = (CircleImageView) findViewById(R.id.set_profile_image);
loadingBar = new ProgressDialog(this);
}
private void SendUserToMainActivity() {
Intent mainIntent = new Intent(SettingsActivity.this, MainActivity.class);
mainIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(mainIntent);
finish();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == GalleryPick && resultCode == RESULT_OK && data != null) {
Uri ImageUri = data.getData();
CropImage.activity()
.setGuidelines(CropImageView.Guidelines.ON)
.setAspectRatio(1,1)
.start(SettingsActivity.this);
}
if (requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE) {
CropImage.ActivityResult result = CropImage.getActivityResult(data);
if (resultCode == RESULT_OK) {
loadingBar.setTitle("Set Profile Image");
loadingBar.setMessage("Please wait, your profile image is updating...");
loadingBar.setCanceledOnTouchOutside(false);
loadingBar.show();
Uri resultUri = result.getUri();
StorageReference filePath = UserProfileImageRef.child(currentUserID + ".jpg");
filePath.putFile(resultUri).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
@Override
public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
if (task.isSuccessful()) {
Toast.makeText(SettingsActivity.this, "Profile Image Uploaded Successfully", Toast.LENGTH_SHORT).show();
final String downloadedUrl = task.getResult().getStorage().getDownloadUrl().toString();
RootRef.child("Users").child(currentUserID).child("image")
.setValue(downloadedUrl)
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()) {
Toast.makeText(SettingsActivity.this, "Image saved in Database Successfully...", Toast.LENGTH_SHORT).show();
loadingBar.dismiss();
//Glide.with(SettingsActivity.this).load(downloadedUrl).into(userProfileImage);
}
else {
String message = task.getException().toString();
Toast.makeText(SettingsActivity.this, "Error: " + message, Toast.LENGTH_SHORT).show();
loadingBar.dismiss();
}
}
});
}
else {
String message = task.getException().toString();
Toast.makeText(SettingsActivity.this, "Error: " + message, Toast.LENGTH_SHORT).show();
loadingBar.dismiss();
}
}
});
}
}
}
}