這篇來寫-先從網站http://localhost:8080/api/products 來看springboot
到springboot增加JPA的管理:
原來的程式碼:
package com.huang.ecommerce.config;
import com.huang.ecommerce.entity.Product;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurer;
import org.springframework.http.HttpMethod;
@Configuration
public class MyDataRestConfig implements RepositoryRestConfigurer {
@Override
public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
HttpMethod[] theUnsupportedActions={HttpMethod.PUT,HttpMethod.POST,HttpMethod.DELETE};
config.getExposureConfiguration()
.forDomainType(Product.class)
.withItemExposure(((metdata, httpMethods) -> httpMethods.disable(theUnsupportedActions)))
.withCollectionExposure(((metdata, httpMethods) -> httpMethods.disable(theUnsupportedActions)));
}
}
新增關於entity的管理和類型後
package com.huang.ecommerce.config;
import com.huang.ecommerce.entity.Product;
import com.huang.ecommerce.entity.ProductCategory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurer;
import org.springframework.http.HttpMethod;
import javax.persistence.EntityManager;
import javax.persistence.metamodel.EntityType;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
@Configuration
public class MyDataRestConfig implements RepositoryRestConfigurer {
private EntityManager entityManager;
@Autowired
public MyDataRestConfig(EntityManager theEntityManager){
entityManager = theEntityManager;
}
@Override
public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
HttpMethod[] theUnsupportedActions={HttpMethod.PUT,HttpMethod.POST,HttpMethod.DELETE};
config.getExposureConfiguration()
.forDomainType(Product.class)
.withItemExposure(((metdata, httpMethods) -> httpMethods.disable(theUnsupportedActions)))
.withCollectionExposure(((metdata, httpMethods) -> httpMethods.disable(theUnsupportedActions)));
config.getExposureConfiguration()
.forDomainType(ProductCategory.class)
.withItemExposure(((metdata, httpMethods) -> httpMethods.disable(theUnsupportedActions)))
.withCollectionExposure(((metdata, httpMethods) -> httpMethods.disable(theUnsupportedActions)));
exposeIds(config);
}
private void exposeIds(RepositoryRestConfiguration config) {
Set<EntityType<?>> entities =entityManager.getMetamodel().getEntities();
List<Class> entityClasses =new ArrayList<>();
for(EntityType tempEntityType : entities){
entityClasses.add(tempEntityType.getJavaType());
}
Class [] domainTypes = entityClasses.toArray(new Class[0]);
config.exposeIdsFor(domainTypes);
}
}
再重啟springboot可以看到id編號:
回到angular的VS CODE新增資料夾-使用語法ng generate class common/product-category
會跳出是否允許防火牆開放->按允許才會新增
到檔案product-category.ts開始新增
export class ProductCategory {
id: number;
categoryName: string;
}
然後再新增menu
繼續昨天的閒聊~就是資料導入~
Ex. 1 通訊錄
用字元串流 Reader/Writer 輸入/輸出通訊錄
import java.io.*;
/*
* 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.
*/
/**
*
* @author User
*/
public class BufferedFile {
/**
* @param args the command line arguments
*/
public static void main(String[] args)throws IOException {
// TODO code application logic here
System.out.println("要建立的通訊錄檔名");
System.out.print("➟");
BufferedReader br=new BufferedReader (new InputStreamReader(System.in));
String filename=br.readLine();
BufferedWriter bw =new BufferedWriter(new FileWriter(filename));
String str=new String();
do{
System.out.print("請輸入姓名:");
str=br.readLine();
bw.write(str,0,str.length());
bw.write('\t');
System.out.print("請輸入電話號碼:");
str=br.readLine();
bw.write(str,0,str.length());
bw.newLine();
System.out.print("還要輸入另一筆資料嗎(y/n):");
str=br.readLine();
}while(str.equalsIgnoreCase("Y"));
bw.flush();
bw.close();
System.out.println("\n已將資料寫入檔案"+filename);
System.out.print("您想立即檢視檔案內容嗎(y/n):");
str=br.readLine();
if(str.equalsIgnoreCase("Y")){
BufferedReader bfr=new BufferedReader(new FileReader(filename));
while((str=bfr.readLine())!=null)
System.out.println(str);
bfr.close();
}
}
}
程式碼:
字元串流檔 位元串流檔
程式碼1:
/*
* 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.
*/
/**
*
* @author User
*/
public class Student implements Serializable {
public Student (String s,short e,short m,short j){
name=s;
EScore=e;
MScore=m;
JScore=j;
}
public Student(){}
public String getN(){return name;}
public Short getE(){return EScore;}
public Short getM(){return MScore;}
public Short getJ(){return JScore;}
public double getAvg(){
return(EScore+MScore+JScore);
}
private String name;
private short EScore;
private short MScore;
private short JScore;
}````
---
程式碼2:
````import java.io.*;
/*
* 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.
*/
/**
*
* @author User
*/
public class WriteObject {
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws IOException {
// TODO code application logic here
System.out.println("請輸入要建立的學生成績檔檔名");
System.out.print("➡");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String filename=br.readLine();
ObjectOutputStream os=new ObjectOutputStream(new FileOutputStream(filename));
String str=new String();
int counter=0;
do{
counter++;
System.out.print("請輸入學生姓名:");
String name=br.readLine();
System.out.print("請輸入英文分數:");
str=br.readLine();
short e=Short.parseShort(str);
System.out.print("請輸入數學分數:");
str=br.readLine();
short m=Short.parseShort(str);
System.out.print("請輸入Java分數:");
str=br.readLine();
short j=Short.parseShort(str);
Student ss=new Student(name,e,m,j);
os.writeObject(ss);
System.out.print("還要輸入另外一筆資料嗎(y/n)");
str=br.readLine();
}while(str.equalsIgnoreCase("Y"));
os.flush();
os.close();
System.out.println("\n已寫入"+counter+"筆學生資料至檔案"+filename);
}
}
ObjectStream File FileReader/FileWriter
程式碼3:
/*
* 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.
*/
/**
*
* @author User
*/
public class ReadObject {
public static void main(String[] args) throws IOException,ClassNotFoundException {
// TODO code application logic here
System.out.println("要讀取的學生成績檔檔名");
System.out.print("➡");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String filename=br.readLine();
int counter=0;
double Esum=0;
double Msum=0;
double Jsum=0;
Student ss=new Student();
System.out.println("姓名\t英文\t數學\tJava\t平均");
System.out.println("-------------------------------------");
try(ObjectInputStream ois=
new ObjectInputStream(new FileInputStream(filename))){
while(true){
ss=(Student)ois.readObject();
counter++;
Esum +=ss.getE();
Msum +=ss.getM();
Jsum +=ss.getJ();
System.out.println(ss.getN()+'\t'+ss.getE()+'\t'
+ss.getM()+'\t'+ss.getJ()+'\t'
+ss.getAvg());
}
}
catch(EOFException e){
System.out.println("\n已從檔案"+filename+"讀取"+counter+"筆學生資料");
System.out.println("\n全員英文平均"+(Esum/counter));
System.out.println("\n全員數學平均"+(Msum/counter));
System.out.println("\n全員JAVA平均"+(Jsum/counter));
}
}
}
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