[JAVA] How to register as a customer with Square using Tomcat
table of contents
--Create Maven project in Eclipse --Register Tomcat (Java Servlet API) and Square in Maven project --Registration page creation (JSP creation) --Create internal processing-1- (communication with JSP) --Create internal processing-2- (Communication with Square)
Create Maven project in Eclipse
Reference site [Eclipse / Tomcat] Servlet + JSP in Maven webapp project
1. Right-click inside the ** Package Explorer ** in Eclipse
2. Click ** New ** to ** Maven Project **
3. Click ** Next **
-(** Not selected ) Create a simple project (skip archetype selection) -( Select ) Use default workspace location -( not selected ) Add project to working space -( Not set **) Extended
4. Select ** maven-archetype-webapp ** ** Next **
- If you copy and paste to the filter → "org.apache.maven.archetypes"
5. Enter ** group id ** and ** artifact id ** and click ** Done **
To briefly explain
-** Group id ** is ** Group to which you belong ** -** Artifid id ** is ** project name **
You can think of it. If you don't know what the group id should be, "com. ○○" ← ○ should be the ID that skipped @ on Twitter. For those who want to know more ↓ 「Guide to naming conventions on groupId, artifactId, and version」 "Create a new Maven project in Eclipse (Java)"
6. Success if you have a Maven project you created!
7. Change the JRE (Java Runtime Environment) version from 1.7 to 11 (8 is acceptable)
-
Right-click ** JRE system library [JavaSE-1.7] ** in your Maven project
-
Click ** Properties **
-
Click ** Java SE-1.7 (java7) ** in the execution environment
-
Click ** Java SE-11 (java11) **
-
Success if it becomes Java SE-11!
8. Revive the missing folder!
-
Right-click ** JRE system library [JavaSE-11] ** in your Maven project
-
Click ** Build Path ** to ** Build Path Configuration **
-
Select ** Source ** (Top "** Source **" "Project" "Library" "Order and Export" "Module Dependencies")
-
Select ** Adapt and Close **
-
Success if the missing folder is created!
Register Tomcat (Java Servlet API) in Maven project
Reference site [Eclipse / Tomcat] Servlet + JSP in Maven webapp project
1. Double-click ** pom.xml ** in the created Maven project
2. Copy the latest Java Servlet API xml code
https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api ↓ xml code Ver: 4.0.1 at the time of article creation (April 26, 2020)
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
3. Insert .....
- Inserted between the 28th line (</ dependency>) and 29th line (</ dependency>) at the time of article creation
↓ Inserted from the 31st line to the 36th line
4. Copy the latest Square SDK xml code
https://search.maven.org/search?q=g:com.squareup%20AND%20a:square ↓ xml code Ver: 5.2.2.20200422 at the time of article creation (April 26, 2020)
<dependency>
<groupId>com.squareup</groupId>
<artifactId>square</artifactId>
<version>5.2.2.20200422</version>
</dependency>
5. Insert .....
Inserted between line 36 (</ dependency>) and line 37 (</ dependency>) at the time of article creation
↓ Inserted from the 37th line to the 41st line
4. Success if added to Maven dependency!
Registration page creation (JSP creation)
Thank you for waiting! Now that the preparations are complete, I'm going to program!
1. Right-click "src"-> "main"-> "webapp"-> "WEB-INF" of the created Maven project and click "New"-> "Other"
2. Select "JSP File" in "Web" and Next
3. Enter the file name and complete
I made it MainServlet.
4. Display the first name (last name and first name) and the submit button
MainServlet.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!--↓ Site name-->
<title>square customer registration page</title>
</head>
<body>
<!--↓ Destination Java-->
<form action="./Main">
<p>name</p>
<a>sex</a>
<!--↓ Box to put the surname-->
<input type="text" name="name1">
<a>Name</a>
<!--↓ Box to put your name-->
<input type="text" name="name2">
<br>
<!--↓ Send button to Jsp-->
<input type="submit" value="Send">
</form>
</body>
</html>
Create internal processing-1- (communication with JSP)
1. Right-click "src / main / java" of the created Maven project and click "New"-> "Other"
- If src / main / java does not exist →
2. Select "Servlet" of "Web" ** Next **
3. Enter the class name and complete
I get angry when I do this in my actual work ...
4. If created, it will be like this ↓
Be careful not to be killed by Ahagon. Headshot attention
5. First, write a program that will be transferred from java to jsp
Changed (added) location ↓
Main.java
//Forward to JSP (specify file location)
String view = "/WEB-INF/MainServlet.jsp";
RequestDispatcher dispatcher = request.getRequestDispatcher(view);
dispatcher.forward(request, response);
All ↓
Main.java
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class Main
*/
public class Main extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Main() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
// response.getWriter().append("Served at: ").append(request.getContextPath());
//Forward to JSP (specify file location)
String view = "/WEB-INF/MainServlet.jsp";
RequestDispatcher dispatcher = request.getRequestDispatcher(view);
dispatcher.forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
6. Try running it and if the content described in Jsp is displayed, it's OK!
↓ Success!
↓ If the characters are garbled
Main.java
response.getWriter().append("Served at: ").append(request.getContextPath());
↑ Let's comment this out!
7. Let's receive the characters entered in Jsp in Java
Description: Put the characters in the Jsp "id = name1" textbox into "String name1"
Main.java
//Received from jsp
String name1 = request.getParameter("name1");//name(sex)
String name2 = request.getParameter("name2");//name(Name)
7. If it is null, do not execute it
Description: Run if name1 and name2 are not null
Main.java
if (name1 != null || name2 != null) {
}
8. I get an error if it is blank
Description: Run if name1 and name2 are not blank. If it is blank, an error will be issued.
Main.java
if (!name1.equals("") && !name2.equals("")) {
}else{
System.out.println("Please enter your gender and name");
}
9. I'll send it to Square.java
Description: Send sex and name to Square.java
Main.java
//Send to square
Square square = new Square();
square.main(name1, name2);
10. All described so far ↓
Main.java
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import square.SquareMain;
/**
* Servlet implementation class Main
*/
public class Main extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Main() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
// response.getWriter().append("Served at: ").append(request.getContextPath());
//Received from jsp
String name1 = request.getParameter("name1");//name(sex)
String name2 = request.getParameter("name2");//name(Name)
if (name1 != null || name2 != null) {
if (!name1.equals("") && !name2.equals("")) {
//Send to square
Square square = new Square();
square.main(name1, name2);
System.out.println("Done:");
} else {
System.out.println("Please enter your gender and name");
}
}
//Forward to JSP (specify file location)
String view = "/WEB-INF/MainServlet.jsp";
RequestDispatcher dispatcher = request.getRequestDispatcher(view);
dispatcher.forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
Create internal processing-2- (communication with Square)
Referenced site "Java client library for the Square API"
1. Right-click "src / main / java"-> "Default Package" of the created Maven project and click "New"-> "Class".
2. Enter your name and click Finish
Also pay attention to Eclipse ...
3. First, enter the access token
↓ For testing
Square.java
SquareClient client = new SquareClient.Builder()
.environment(Environment.SANDBOX)
.accessToken("YOUR_SANDBOX_ACCESS_TOKEN")
.build();
↓ For production
Square.java
SquareClient client = new SquareClient.Builder()
.environment(Environment.PRODUCTION)
.accessToken("ACCESS TOKEN HERE")
.build();
4.CustomersAPI Details: "Customers"
Square.java
CustomersApi api = client.getCustomersApi();
5. Make a shape to send
Details: "Create Customer"
Square.java
CreateCustomerRequest createCustomerRequest = new CreateCustomerRequest.Builder()
.idempotencyKey("unique_idempotency_key")
.givenName(name1)//sex
.familyName(name2)//Name
.address(null)//Not used this time
.build();
6. I'll send it!
Square.java
try {
CreateCustomerResponse response = api.createCustomer(createCustomerRequest);
} catch (ApiException e) {
List<Error> errors = e.getErrors();
int statusCode = e.getResponseCode();
HttpContext httpContext = e.getHttpContext();
// Your error handling code
System.err.println("ApiException error when calling API");
e.printStackTrace();
} catch (IOException e) {
// Your error handling code
System.err.println("IOException error when calling API");
e.printStackTrace();
}
7. All of Square.java
Square.java
import java.io.IOException;
import java.util.List;
import com.squareup.square.Environment;
import com.squareup.square.SquareClient;
import com.squareup.square.api.CustomersApi;
import com.squareup.square.exceptions.ApiException;
import com.squareup.square.http.client.HttpContext;
import com.squareup.square.models.CreateCustomerRequest;
import com.squareup.square.models.CreateCustomerResponse;
import com.squareup.square.models.Error;
public class Square {
public void main(String name1, String name2) {
SquareClient client = new SquareClient.Builder()
.environment(Environment.PRODUCTION)
.accessToken("ACCESS TOKEN HERE")
.build();
CustomersApi api = client.getCustomersApi();
CreateCustomerRequest createCustomerRequest = new CreateCustomerRequest.Builder()
.idempotencyKey("unique_idempotency_key")
.givenName(name1)//sex
.familyName(name2)//Name
.address(null)//Not used this time
.build();
try {
CreateCustomerResponse response = api.createCustomer(createCustomerRequest);
} catch (ApiException e) {
List<Error> errors = e.getErrors();
int statusCode = e.getResponseCode();
HttpContext httpContext = e.getHttpContext();
// Your error handling code
System.err.println("ApiException error when calling API");
e.printStackTrace();
} catch (IOException e) {
// Your error handling code
System.err.println("IOException error when calling API");
e.printStackTrace();
}
}
}
Complete!
I found that it would be difficult to read the article if I wrote the article as if I were teaching it because it was a video.
I will be careful from the next time
PS insertion is erotic, isn't it?
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