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Internet-Technologien
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Merge branch 'julian2' of Studium/Internet-Technologien into master

This commit is contained in:
Johannes Theiner 2019-05-02 07:54:13 +00:00 committed by Gitea
parent 41dd15048a c9785a5f32
commit 2ef4187b37
8 changed files with 221 additions and 102 deletions
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7
pom.xml
View File

@ -261,11 +261,18 @@
<version>13.0</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.0</version>
</dependency>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20180813</version>
</dependency>
<dependency>
<groupId>org.mariadb.jdbc</groupId>

2
src/main/java/de/hsel/itech/config/Configuration.java
View File

@ -25,6 +25,8 @@ public class Configuration {
@Getter
private Database database;
@Getter
private Unsplash unsplash;
/**

20
src/main/java/de/hsel/itech/config/Unsplash.java Normal file
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@ -0,0 +1,20 @@
package de.hsel.itech.config;
import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.ToString;
/**
* @author Johannes Theiner
* @version 0.1
* @since 0.1
**/
@Getter
@ToString
@EqualsAndHashCode
public class Unsplash {
private String accessKey;
private String secretKey;
}

180
src/main/java/de/hsel/itech/db/Database.java
View File

@ -7,12 +7,12 @@ import de.hsel.itech.db.pojo.Category;
import de.hsel.itech.db.pojo.Publisher;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.json.JSONObject;
import org.mariadb.jdbc.MariaDbPoolDataSource;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.*;
import java.net.URL;
import java.nio.charset.Charset;
import java.sql.*;
import java.time.Year;
import java.util.AbstractMap;
@ -105,7 +105,7 @@ public class Database {
*/
@Nullable
public Author getAuthor(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSet(id, author);
Map.Entry<ResultSet, Connection> entry = getResultSetById(author, id);
assert entry != null;
ResultSet rs = entry.getKey();
@ -126,8 +126,8 @@ public class Database {
* @return {@link de.hsel.itech.db.pojo.Author}
*/
@Nullable
public Author getAuthor(String name) {
Map.Entry<ResultSet, Connection> entry = getResultSets(author, "name", name);
public Author getAuthor(@NotNull String name) {
Map.Entry<ResultSet, Connection> entry = getResultSetsByValue(author, "name", name);
assert entry != null;
assert entry.getKey() != null;
@ -152,7 +152,7 @@ public class Database {
*/
@Nullable
public Category getCategory(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSet(id, category);
Map.Entry<ResultSet, Connection> entry = getResultSetById(category, id);
assert entry != null;
ResultSet rs = entry.getKey();
@ -171,13 +171,18 @@ public class Database {
* @return {@link de.hsel.itech.db.pojo.Category}
*/
@Nullable
public Category getCategory(String name) {
Map.Entry<ResultSet, Connection> entry = getResultSets(category, "name", name);
public Category getCategory(@NotNull String name) {
Map.Entry<ResultSet, Connection> entry = getResultSetsByValue(category, "name", name);
assert entry != null;
return getCategory(entry);
}
/**
* get Category from database entry.
* @param entry entry
* @return Category
*/
@Nullable
private Category getCategory(@NotNull Map.Entry<ResultSet, Connection> entry) {
ResultSet rs = entry.getKey();
@ -193,6 +198,22 @@ public class Database {
return category;
}
/**
* get all categories.
*
* @return list of categories
*/
@Nullable
public List<Category> getCategories() {
List<Long> ids = getIds(category);
List<Category> categories = new ArrayList<>();
for (long id : ids) {
categories.add(getCategory(id));
}
return categories;
}
/**
* gets publisher by id.
*
@ -201,7 +222,7 @@ public class Database {
*/
@Nullable
public Publisher getPublisher(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSet(id, publisher);
Map.Entry<ResultSet, Connection> entry = getResultSetById(publisher, id);
assert entry != null;
ResultSet rs = entry.getKey();
@ -222,8 +243,8 @@ public class Database {
* @return {@link de.hsel.itech.db.pojo.Publisher}
*/
@Nullable
public Publisher getPublisher(String name) {
Map.Entry<ResultSet, Connection> entry = getResultSets(publisher, "name", name);
public Publisher getPublisher(@NotNull String name) {
Map.Entry<ResultSet, Connection> entry = getResultSetsByValue(publisher, "name", name);
assert entry != null;
assert entry.getKey() != null;
@ -249,7 +270,7 @@ public class Database {
*/
@Nullable
private List<Integer> getAuthors(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSets(id, authorBook, book);
Map.Entry<ResultSet, Connection> entry = getResultSetsById(authorBook, book, id);
assert entry != null;
try {
List<Integer> list = new ArrayList<>();
@ -273,16 +294,26 @@ public class Database {
*/
@Nullable
public Book getBook(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSet(id, book);
Map.Entry<ResultSet, Connection> entry = getResultSetById(book, id);
assert entry != null;
return buildBook(entry);
}
/**
* builds book from entry.
*
* @param entry Map.Entry
* @return Book
*/
@Nullable
private Book buildBook(@NotNull Map.Entry<ResultSet, Connection> entry) {
ResultSet rs = entry.getKey();
Book book = null;
ResultSet rs = entry.getKey();
try {
Category category = getCategory(rs.getLong(this.category));
Publisher publisher = getPublisher(rs.getLong(this.publisher));
List<Integer> authorIds = getAuthors(id);
List<Integer> authorIds = getAuthors(rs.getLong("id"));
assert category != null;
assert publisher != null;
assert authorIds != null;
@ -296,6 +327,7 @@ public class Database {
book = new Book(rs.getLong("id"), rs.getLong("isbn"), authors, publisher, category, rs.getString("title"),
Year.of(rs.getInt("year")), rs.getInt("price"), rs.getString("description"),
rs.getString("image"));
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
@ -310,19 +342,7 @@ public class Database {
*/
@Nullable
public List<Book> getBooks() {
Map.Entry<ResultSet, Connection> entry = getResultSets(book, "id");
assert entry != null;
List<Long> ids = new ArrayList<>();
try {
ResultSet rs = entry.getKey();
while (rs.next()) {
ids.add(rs.getLong("id"));
}
entry.getValue().close();
} catch (SQLException ex) {
ex.printStackTrace();
}
List<Long> ids = getIds(book);
List<Book> books = new ArrayList<>();
for (long id : ids) {
books.add(getBook(id));
@ -370,6 +390,25 @@ public class Database {
return getBooks(category.getId());
}
/**
* exists book with isbn ?
*
* @param isbn isbn
* @return true if book with isbn exists
*/
public boolean existsBook(long isbn) {
Map.Entry<ResultSet, Connection> entry = getResultSetByValue(book, "isbn", isbn);
try {
if (entry != null && entry.getKey() != null) {
entry.getValue().close();
return true;
}
} catch (SQLException ex) {
ex.printStackTrace();
}
return false;
}
/**
* Inserts book into database.
@ -416,7 +455,7 @@ public class Database {
if (dbCategory != null)
category = dbCategory;
else {
insertCount += insert(new Category(book.getCategory().getName(), book.getCategory().getImage()));
insertCount += insert(new Category(book.getCategory().getName(), getRandomImage()));
category = getCategory(book.getCategory().getName());
}
} else category = book.getCategory();
@ -424,6 +463,7 @@ public class Database {
assert publisher != null;
assert category != null;
//insert book
try {
PreparedStatement statement = connection.prepareStatement("INSERT INTO book(isbn, title, description, " +
"price, year, publisher, category, image) VALUES (?, ?, ?, ?, ?, ?, ?, ?)", Statement.RETURN_GENERATED_KEYS);
@ -442,6 +482,7 @@ public class Database {
lastId = resultSet.getLong("id");
}
//add book to author
for (Author author : authors) {
PreparedStatement authorStatement = connection.prepareStatement("INSERT INTO " + authorBook + " (author, book) VALUES (?, ?);");
authorStatement.setLong(1, author.getId());
@ -594,7 +635,7 @@ public class Database {
* @param table table name
* @return deletion count
*/
private int delete(long id, String table) {
private int delete(long id, @NotNull String table) {
Connection connection = getConnection();
assert connection != null;
@ -611,21 +652,50 @@ public class Database {
return deleteCount;
}
/**
* get all ids from specified table.
*
* @param table table
* @return list of ids
*/
private List<Long> getIds(@NotNull String table) {
Map.Entry<ResultSet, Connection> entry = getColumnsFromResultSet(table, "id");
assert entry != null;
List<Long> ids = new ArrayList<>();
try {
ResultSet rs = entry.getKey();
while (rs.next()) {
ids.add(rs.getLong("id"));
}
entry.getValue().close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return ids;
}
/**
* gets specific entry from database.
*
* @param id id from database
* @param table table name
* @param id id from database
* @return {@link java.util.Map.Entry}
*/
@Nullable
private Map.Entry<ResultSet, Connection> getResultSet(long id, String table) {
private Map.Entry<ResultSet, Connection> getResultSetById(@NotNull String table, long id) {
return getResultSetByValue(table, "id", id);
}
@Nullable
private Map.Entry<ResultSet, Connection> getResultSetByValue(@NotNull String table, @NotNull String column, long value) {
Connection connection = getConnection();
try {
assert connection != null;
PreparedStatement statement = connection.prepareStatement("SELECT * FROM " + table + " WHERE id = ?");
statement.setLong(1, id);
PreparedStatement statement = connection.prepareStatement("SELECT * FROM " + table + " WHERE " + column + " = ?");
statement.setLong(1, value);
ResultSet resultSet = statement.executeQuery();
if (resultSet.next()) {
return new AbstractMap.SimpleEntry<>(resultSet, connection);
@ -641,20 +711,20 @@ public class Database {
/**
* gets specific entries from table.
*
* @param id id all entries should reference
* @param table table name
* @param column column to match
* @param id id all entries should reference
* @return {@link java.util.Map.Entry}
*/
@Nullable
private Map.Entry<ResultSet, Connection> getResultSets(long id, @NotNull String table, @NotNull String column) {
private Map.Entry<ResultSet, Connection> getResultSetsById(@NotNull String table, @NotNull String column, long id) {
Connection connection = getConnection();
try {
assert connection != null;
PreparedStatement statement = connection.prepareStatement("SELECT * FROM " + table + " WHERE " + column + " = ?");
statement.setLong(1, id);
return getAllEntries(connection, statement);
return getAllEntriesFromResultSet(connection, statement);
} catch (SQLException ex) {
ex.printStackTrace();
}
@ -669,14 +739,14 @@ public class Database {
* @return {@link java.util.Map.Entry}
*/
@Nullable
private Map.Entry<ResultSet, Connection> getResultSets(@NotNull String table, @NotNull String column, @NotNull String value) {
private Map.Entry<ResultSet, Connection> getResultSetsByValue(@NotNull String table, @NotNull String column, @NotNull String value) {
Connection connection = getConnection();
try {
assert connection != null;
PreparedStatement statement = connection.prepareStatement("SELECT * FROM " + table + " WHERE " + column + " = ?");
statement.setString(1, value);
return getAllEntries(connection, statement);
return getAllEntriesFromResultSet(connection, statement);
} catch (SQLException ex) {
ex.printStackTrace();
}
@ -691,13 +761,13 @@ public class Database {
* @return {@link java.util.Map.Entry}
*/
@Nullable
private Map.Entry<ResultSet, Connection> getResultSets(@NotNull String table, @NotNull String... columns) {
private Map.Entry<ResultSet, Connection> getColumnsFromResultSet(@NotNull String table, @NotNull String... columns) {
Connection connection = getConnection();
try {
assert connection != null;
PreparedStatement statement = connection.prepareStatement("SELECT (" + String.join(",", columns) + ") FROM " + table);
return getAllEntries(connection, statement);
return getAllEntriesFromResultSet(connection, statement);
} catch (SQLException ex) {
ex.printStackTrace();
}
@ -712,7 +782,7 @@ public class Database {
* @return {@link java.util.Map.Entry}
*/
@Nullable
private Map.Entry<ResultSet, Connection> getAllEntries(@NotNull Connection connection, @NotNull PreparedStatement statement) {
private Map.Entry<ResultSet, Connection> getAllEntriesFromResultSet(@NotNull Connection connection, @NotNull PreparedStatement statement) {
try {
ResultSet resultSet = statement.executeQuery();
return new AbstractMap.SimpleEntry<>(resultSet, connection);
@ -721,4 +791,28 @@ public class Database {
}
return null;
}
@Nullable
private String getRandomImage() {
try {
InputStream is = new URL("https://api.unsplash.com/photos/random?client_id=" + Configuration.get().getUnsplash().getAccessKey()).openStream();
try {
BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
StringBuilder sb = new StringBuilder();
int cp;
while ((cp = rd.read()) != -1) {
sb.append((char) cp);
}
JSONObject json = new JSONObject(sb.toString());
return json.getString("id");
} finally {
is.close();
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}

7
src/main/java/de/hsel/itech/servlet/AddBook.java
View File

@ -1,5 +1,7 @@
package de.hsel.itech.servlet;
import org.jetbrains.annotations.NotNull;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
@ -10,7 +12,6 @@ import java.io.PrintWriter;
/**
* Servlet: form to add a book to the database
*
*
* @author Julian Hinxlage
* @version 0.1
* @since 0.1
@ -20,7 +21,7 @@ import java.io.PrintWriter;
public class AddBook extends HttpServlet {
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp)
protected void doGet(@NotNull final HttpServletRequest req, @NotNull final HttpServletResponse resp)
throws IOException {
resp.setCharacterEncoding("utf-8");
@ -37,7 +38,7 @@ public class AddBook extends HttpServlet {
Utillity.addInput(out, "Beschreibung", "description");
Utillity.addInput(out, "Verlag", "publisher");
Utillity.addInput(out, "Kategorie", "category");
Utillity.addInput(out,"Bild", "image", "DxAzOKSiPoE");
Utillity.addInput(out, "Bild", "image");
Utillity.addSubmitButton(out, "Hinzufügen");
out.println("</form>");

37
src/main/java/de/hsel/itech/servlet/BookList.java
View File

@ -5,6 +5,7 @@ import de.hsel.itech.db.pojo.Author;
import de.hsel.itech.db.pojo.Book;
import de.hsel.itech.db.pojo.Category;
import de.hsel.itech.db.pojo.Publisher;
import org.jetbrains.annotations.NotNull;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
@ -20,7 +21,6 @@ import java.util.List;
/**
* Servlet: list of all books and remove function
*
*
* @author Julian Hinxlage
* @version 0.1
* @since 0.1
@ -29,14 +29,19 @@ import java.util.List;
@WebServlet("/booklist")
public class BookList extends HttpServlet {
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp)
throws IOException {
@Override
protected void doGet(@NotNull HttpServletRequest req, @NotNull HttpServletResponse resp) throws IOException {
doPost(req, resp);
}
@Override
protected void doPost(@NotNull final HttpServletRequest req, @NotNull final HttpServletResponse resp) throws IOException {
req.setCharacterEncoding(StandardCharsets.UTF_8.name());
//get database object
Database db = Database.getInstance();
resp.setCharacterEncoding("utf-8");
resp.setCharacterEncoding(StandardCharsets.UTF_8.name());
PrintWriter out = resp.getWriter();
//header template
@ -74,20 +79,9 @@ public class BookList extends HttpServlet {
String image = req.getParameter("image");
//check isbn
List<Book> books = db.getBooks();
boolean found = false;
if (books != null) {
for(Book b : books){
if(b.getIsbn() == isbn){
found = true;
break;
}
}
}
if (found) {
if (db.existsBook(isbn)) {
out.println("<aside class =\"m-note m-danger\">");
out.println("<h3>Es gibt breits ein buch mit dieser ISBN </h3>");
out.println("<h3>Es gibt bereits ein Buch mit dieser ISBN </h3>");
out.println("</aside>");
} else {
ArrayList<Author> authors = new ArrayList<>();
@ -105,8 +99,7 @@ public class BookList extends HttpServlet {
db.insert(book);
resp.sendRedirect("booklist");
}
}
catch (Exception e){
} catch (Exception e) {
e.printStackTrace();
out.println("<aside class =\"m-note m-danger\">");
out.println("<h3>Es gibt ein Fehler in der Eingabe </h3>");
@ -116,7 +109,6 @@ public class BookList extends HttpServlet {
}
//list all books
List<Book> books = db.getBooks();
if (books != null) {
@ -178,9 +170,4 @@ public class BookList extends HttpServlet {
Utillity.insertFile(out, "template_footer.html");
}
protected void doPost(final HttpServletRequest req, final HttpServletResponse resp)
throws IOException {
doGet(req, resp);
}
}

22
src/main/java/de/hsel/itech/servlet/Utillity.java
View File

@ -1,14 +1,22 @@
package de.hsel.itech.servlet;
import org.jetbrains.annotations.NotNull;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Objects;
/**
* @author Julian Hinxlage
* @version 0.1
* @since 0.1
*/
public class Utillity {
static public void insertFile(PrintWriter out, String fileName) {
try (BufferedReader br = new BufferedReader(new FileReader(Utillity.class.getClassLoader().getResource(fileName).getFile()))) {
public static void insertFile(@NotNull PrintWriter out, @NotNull String fileName) {
try (BufferedReader br = new BufferedReader(new FileReader(Objects.requireNonNull(Utillity.class.getClassLoader().getResource(fileName)).getFile()))) {
for (String line = br.readLine(); line != null; line = br.readLine()) {
out.println(line);
}
@ -17,11 +25,11 @@ public class Utillity {
}
}
static public void addInput(PrintWriter out, String label, String name){
public static void addInput(@NotNull PrintWriter out, @NotNull String label, @NotNull String name) {
addInput(out, label, name, "");
}
static public void addInput(PrintWriter out, String label, String name, String value){
public static void addInput(@NotNull PrintWriter out, @NotNull String label, @NotNull String name, @NotNull String value) {
out.println(" <div class=\"m-row\">");
out.println(" <div class=\"m-col-l-2 m-push-l-5\">");
out.println(label);
@ -30,7 +38,7 @@ public class Utillity {
out.println("</div>");
}
static public void addValidationInput(PrintWriter out, String label, String name, String type, String value, String pattern){
public static void addValidationInput(@NotNull PrintWriter out, @NotNull String label, @NotNull String name, @NotNull String type, @NotNull String value, @NotNull String pattern) {
out.println(" <div class=\"m-row\">");
out.println(" <div class=\"m-col-l-2 m-push-l-5\">");
out.println(label);
@ -39,7 +47,7 @@ public class Utillity {
out.println("</div>");
}
static public void addButton(PrintWriter out, String label, String url){
public static void addButton(@NotNull PrintWriter out, @NotNull String label, @NotNull String url) {
out.println(" <div class=\"m-row\">");
out.println(" <div class=\"m-col-l-4 m-push-l-4\">");
out.println(" <div class=\"m-button m-success\">");
@ -51,7 +59,7 @@ public class Utillity {
out.println("</div>");
}
static public void addSubmitButton(PrintWriter out, String label){
public static void addSubmitButton(@NotNull PrintWriter out, @NotNull String label) {
out.println(" <div class=\"m-row\">");
out.println(" <div class=\"m-col-l-4 m-push-l-5\">");
out.println(" <input type=\"" + "submit" + "\" value=\"" + label + "\">");