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Spark Java Article BAEL-498 (#912) 

* Initial Commit for Spark Java Article BAEL-498

* reverting main pom.xml and rollbacking accidental changes.

* Changes as per review:

1. Added UserService
2. Renamed UserStore to UserServiceMapImpl
3. Removed Empty spaces in User.java
4. Removed AppTest
5. Changes in SparkRestExample for using UserServiceMapImp instead of
UserStore static functions.

* Suggested changes in print messages.

* Changes as per comments on github... for PR:
https://github.com/eugenp/tutorials/pull/912

* Changes in editUser function as per guidance by Kevin.

* Clean up

* added 1.8 config for pom.xml

* Clean up.

* Removed junit dep.

* Added Application/json in response type.
This commit is contained in:
Parth Joshi 2017-01-20 07:44:30 +05:30 committed by KevinGilmore
parent 117635f955
commit ad63b55edb
10 changed files with 334 additions and 0 deletions
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1
pom.xml
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@ -94,6 +94,7 @@
<module>resteasy</module>
<module>selenium-junit-testng</module>
<module>spark-java</module>
<module>spring-akka</module>
<module>spring-amqp</module>
<module>spring-all</module>

29
spark-java/pom.xml Normal file
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@ -0,0 +1,29 @@
<?xml version="1.0"?>
<project
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>spark-java</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>spark-java</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.sparkjava</groupId>
<artifactId>spark-core</artifactId>
<version>2.5.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.0</version>
</dependency>
</dependencies>
</project>

12
spark-java/src/main/java/com/baeldung/sparkjava/HelloWorldService.java Normal file
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@ -0,0 +1,12 @@
package com.baeldung.sparkjava;
import static spark.Spark.*;
public class HelloWorldService {
public static void main(String[] args) {
get("/hello", (req,res)->"Hello, Baeldung");
get("/hello/:name", (req,res)->{
return "Hello: "+ req.params(":name");
});
}
}

76
spark-java/src/main/java/com/baeldung/sparkjava/SparkRestExample.java Normal file
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@ -0,0 +1,76 @@
package com.baeldung.sparkjava;
import static spark.Spark.delete;
import static spark.Spark.get;
import static spark.Spark.options;
import static spark.Spark.post;
import static spark.Spark.put;
import com.google.gson.Gson;
public class SparkRestExample {
public static void main(String[] args) {
final UserService userService = new UserServiceMapImpl();
post("/users", (request, response) -> {
response.type("application/json");
User user = new Gson().fromJson(request.body(), User.class);
userService.addUser(user);
return new Gson().toJson(new StandardResponse(StatusResponse.SUCCESS));
});
get("/users", (request, response) -> {
response.type("application/json");
return new Gson().toJson(
new StandardResponse(StatusResponse.SUCCESS,new Gson()
.toJsonTree(userService.getUsers())));
});
get("/users/:id", (request, response) -> {
response.type("application/json");
return new Gson().toJson(
new StandardResponse(StatusResponse.SUCCESS,new Gson()
.toJsonTree(userService.getUser(request.params(":id")))));
});
put("/users/:id", (request, response) -> {
response.type("application/json");
User toEdit = new Gson().fromJson(request.body(), User.class);
User editedUser = userService.editUser(toEdit);
if (editedUser != null) {
return new Gson().toJson(
new StandardResponse(StatusResponse.SUCCESS,new Gson()
.toJsonTree(editedUser)));
}else {
return new Gson().toJson(
new StandardResponse(StatusResponse.ERROR,new Gson()
.toJson("User not found or error in edit")));
}
});
delete("/users/:id", (request, response) -> {
response.type("application/json");
userService.deleteUser(request.params(":id"));
return new Gson().toJson(
new StandardResponse(StatusResponse.SUCCESS, "user deleted"));
});
options("/users/:id", (request, response) -> {
response.type("application/json");
return new Gson().toJson(
new StandardResponse(StatusResponse.SUCCESS,
(userService.userExist(
request.params(":id"))) ? "User exists" : "User does not exists" ));
});
}
}

47
spark-java/src/main/java/com/baeldung/sparkjava/StandardResponse.java Normal file
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@ -0,0 +1,47 @@
package com.baeldung.sparkjava;
import com.google.gson.JsonElement;
public class StandardResponse {
private StatusResponse status;
private String message;
private JsonElement data;
public StandardResponse(StatusResponse status) {
this.status = status;
}
public StandardResponse(StatusResponse status, String message) {
this.status = status;
this.message = message;
}
public StandardResponse(StatusResponse status, JsonElement data) {
this.status = status;
this.data = data;
}
public StatusResponse getStatus() {
return status;
}
public void setStatus(StatusResponse status) {
this.status = status;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public JsonElement getData() {
return data;
}
public void setData(JsonElement data) {
this.data = data;
}
}

17
spark-java/src/main/java/com/baeldung/sparkjava/StatusResponse.java Normal file
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@ -0,0 +1,17 @@
package com.baeldung.sparkjava;
public enum StatusResponse {
SUCCESS ("Success"),
ERROR ("Error");
final private String status;
StatusResponse(String status) {
this.status = status;
}
public String getStatus() {
return status;
}
}

59
spark-java/src/main/java/com/baeldung/sparkjava/User.java Normal file
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@ -0,0 +1,59 @@
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.baeldung.sparkjava;
class User {
private String id;
private String firstName;
private String lastName;
private String email;
public User(String id, String firstName, String lastName, String email) {
super();
this.id = id;
this.firstName = firstName;
this.lastName = lastName;
this.email = email;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return new StringBuffer().append(getEmail()).toString();
}
}

13
spark-java/src/main/java/com/baeldung/sparkjava/UserException.java Normal file
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@ -0,0 +1,13 @@
package com.baeldung.sparkjava;
public class UserException extends Exception{
public UserException() {
super();
}
public UserException(String message) {
super(message);
}
}

12
spark-java/src/main/java/com/baeldung/sparkjava/UserService.java Normal file
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@ -0,0 +1,12 @@
package com.baeldung.sparkjava;
import java.util.Collection;
public interface UserService {
public void addUser (User user) ;
public Collection<User> getUsers () ;
public User getUser (String id) ;
public User editUser (User user) throws UserException;
public void deleteUser (String id) ;
public boolean userExist (String id);
}

68
spark-java/src/main/java/com/baeldung/sparkjava/UserServiceMapImpl.java Normal file
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@ -0,0 +1,68 @@
package com.baeldung.sparkjava;
import java.util.Collection;
import java.util.HashMap;
public class UserServiceMapImpl implements UserService{
private HashMap<String, User> userMap;
public UserServiceMapImpl() {
userMap = new HashMap<>();
}
@Override
public void addUser (User user) {
userMap.put(user.getId(), user);
}
@Override
public Collection<User> getUsers () {
return userMap.values();
}
@Override
public User getUser (String id) {
return userMap.get(id);
}
@Override
public User editUser (User forEdit) throws UserException{
try{
if (forEdit.getId() == null)
throw new UserException("ID cannot be blank");
User toEdit = userMap.get(forEdit.getId());
if (toEdit == null )
throw new UserException("User not found");
if (forEdit.getEmail()!=null) {
toEdit.setEmail(forEdit.getEmail());
}
if (forEdit.getFirstName()!=null) {
toEdit.setFirstName(forEdit.getFirstName());
}
if (forEdit.getLastName()!=null) {
toEdit.setLastName(forEdit.getLastName());
}
if (forEdit.getId()!=null) {
toEdit.setId(forEdit.getId());
}
return toEdit;
}catch (Exception ex) {
throw new UserException(ex.getMessage());
}
}
@Override
public void deleteUser (String id) {
userMap.remove(id);
}
@Override
public boolean userExist (String id) {
return userMap.containsKey(id);
}
}