public MqConsumer serviceUrl(String serviceUrl) { this.serviceUrl = serviceUrl; return this; }在Java中怎么理解
时间: 2024-04-21 21:22:07 浏览: 10
在Java中,这段代码表示一个名为serviceUrl的方法,返回类型为MqConsumer。该方法使用了链式调用(chaining)的方式。
从方法签名可以看出,该方法接受一个参数serviceUrl,该参数是一个字符串类型。该方法将接收到的serviceUrl赋值给当前对象(即调用该方法的对象)的serviceUrl属性。然后,该方法返回当前对象本身,即this。
通过这种链式调用的方式,可以在一行代码中设置serviceUrl属性,并且继续对同一个对象进行其他方法调用。这种方式可以提高代码的可读性和简洁性,使代码更具有流畅性。
例如,可以像下面这样使用该方法:
```java
MqConsumer consumer = new MqConsumer();
consumer.serviceUrl("http://example.com").otherMethod().anotherMethod();
```
在上述示例中,首先创建了一个MqConsumer对象,并通过调用serviceUrl方法设置了serviceUrl属性值为"http://example.com"。然后继续对同一个对象进行其他方法调用,如otherMethod和anotherMethod。
这种链式调用的方式常用于构建器模式(Builder Pattern)或者流式API设计中,可以方便地进行多个属性的设置或者多个操作的链式调用。
相关问题
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Warehouse Management</title> </head> <body> <h1>Warehouse Management</h1> <p>Scan the barcode to get the warehouse number:</p> <input type="text" id="barcode"> <button onclick="getWarehouseNo()">Get Warehouse Number</button> <p id="warehouseNo"></p> <br> <hr> <p>Add warehouse number manually:</p> <input type="text" id="manualBarcode"> <input type="text" id="manualWarehouseNo"> <button onclick="addWarehouse()">Add Warehouse</button> <br> <hr> <p>View all warehouses:</p> <ul id="warehouseList"></ul> </body> <script src="warehouse.js"></script> </html>function getWarehouseNo() { let barcode = document.getElementById("barcode").value; let xhr = new XMLHttpRequest(); xhr.open("GET", "/api/warehouse/" + barcode, true); xhr.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { document.getElementById("warehouseNo").innerHTML = "Warehouse Number: " + this.responseText; } }; xhr.send();}function addWarehouse() { let barcode = document.getElementById("manualBarcode").value; let warehouseNo = document.getElementById("manualWarehouseNo").value; let xhr = new XMLHttpRequest(); xhr.open("POST", "/api/warehouse/" + barcode + "/" + warehouseNo, true); xhr.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { alert("Warehouse added successfully"); } }; xhr.send();}function getAllWarehouse() { let xhr = new XMLHttpRequest(); xhr.open("GET", "/api/warehouse", true); xhr.onreadystatechange = function() { if (this.readyState === 4 && this.status === 200) { let data = JSON.parse(this.responseText); let warehouseList = document.getElementById("warehouseList"); for (let warehouse in data) { let list = document.createElement("li"); list.innerHTML = warehouse + ": " + data[warehouse].join(", "); warehouseList.appendChild(list); } } }; xhr.send();}getAllWarehouse();根据这些前端代码写出对应的后端java代码按三层架构来写以及启动类
以下是对应的后端Java代码,按照三层架构来实现:
1. DAO层代码
WarehouseDao.java
```
package com.example.warehousemanagement.dao;
import java.util.HashMap;
import java.util.Map;
public class WarehouseDao {
private static Map<String, String[]> warehouseMap = new HashMap<>();
public String[] getWarehouseByBarcode(String barcode) {
return warehouseMap.get(barcode);
}
public void addWarehouse(String barcode, String warehouseNo) {
String[] warehouseNumbers = warehouseMap.getOrDefault(barcode, new String[0]);
String[] newWarehouseNumbers = new String[warehouseNumbers.length + 1];
System.arraycopy(warehouseNumbers, 0, newWarehouseNumbers, 0, warehouseNumbers.length);
newWarehouseNumbers[newWarehouseNumbers.length - 1] = warehouseNo;
warehouseMap.put(barcode, newWarehouseNumbers);
}
public Map<String, String[]> getAllWarehouses() {
return warehouseMap;
}
}
```
2. Service层代码
WarehouseService.java
```
package com.example.warehousemanagement.service;
import com.example.warehousemanagement.dao.WarehouseDao;
import java.util.Map;
public class WarehouseService {
private WarehouseDao warehouseDao;
public WarehouseService() {
warehouseDao = new WarehouseDao();
}
public String[] getWarehouseByBarcode(String barcode) {
return warehouseDao.getWarehouseByBarcode(barcode);
}
public void addWarehouse(String barcode, String warehouseNo) {
warehouseDao.addWarehouse(barcode, warehouseNo);
}
public Map<String, String[]> getAllWarehouses() {
return warehouseDao.getAllWarehouses();
}
}
```
3. Controller层代码
WarehouseController.java
```
package com.example.warehousemanagement.controller;
import com.example.warehousemanagement.service.WarehouseService;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.Map;
@Path("warehouse")
public class WarehouseController {
private WarehouseService warehouseService;
public WarehouseController() {
warehouseService = new WarehouseService();
}
@GET
@Path("{barcode}")
@Produces(MediaType.TEXT_PLAIN)
public Response getWarehouseByBarcode(@PathParam("barcode") String barcode) {
String[] warehouseNumbers = warehouseService.getWarehouseByBarcode(barcode);
if (warehouseNumbers == null) {
return Response.status(Response.Status.NOT_FOUND).entity("Warehouse not found").build();
} else {
return Response.ok(warehouseNumbers[0]).build();
}
}
@POST
@Path("{barcode}/{warehouseNo}")
public Response addWarehouse(@PathParam("barcode") String barcode, @PathParam("warehouseNo") String warehouseNo) {
warehouseService.addWarehouse(barcode, warehouseNo);
return Response.ok().build();
}
@GET
@Produces(MediaType.APPLICATION_JSON)
public Response getAllWarehouses() {
Map<String, String[]> warehouseMap = warehouseService.getAllWarehouses();
return Response.ok(warehouseMap).build();
}
}
```
4. 启动类代码
WarehouseManagementApplication.java
```
package com.example.warehousemanagement;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.servlet.ServletContainer;
import org.glassfish.jersey.servlet.ServletProperties;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
@WebServlet(name = "WarehouseManagementApplication", urlPatterns = {"/api/*"})
public class WarehouseManagementApplication extends HttpServlet {
@Override
public void init() throws ServletException {
ResourceConfig config = new ResourceConfig();
config.packages("com.example.warehousemanagement.controller");
ServletContainer container = new ServletContainer(config);
this.getServletContext().setAttribute(ServletProperties.JAXRS_APPLICATION_CONTEXT_ATTRIBUTE, config);
}
}
```
5. web.xml代码
```
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<servlet>
<servlet-name>WarehouseManagementApplication</servlet-name>
<servlet-class>com.example.warehousemanagement.WarehouseManagementApplication</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>WarehouseManagementApplication</servlet-name>
<url-pattern>/api/*</url-pattern>
</servlet-mapping>
</web-app>
```
6. warehouse.js代码 (无需修改)
```
function getWarehouseNo() {
let barcode = document.getElementById("barcode").value;
let xhr = new XMLHttpRequest();
xhr.open("GET", "/api/warehouse/" + barcode, true);
xhr.onreadystatechange = function() {
if (this.readyState === 4 && this.status === 200) {
document.getElementById("warehouseNo").innerHTML = "Warehouse Number: " + this.responseText;
}
};
xhr.send();
}
function addWarehouse() {
let barcode = document.getElementById("manualBarcode").value;
let warehouseNo = document.getElementById("manualWarehouseNo").value;
let xhr = new XMLHttpRequest();
xhr.open("POST", "/api/warehouse/" + barcode + "/" + warehouseNo, true);
xhr.onreadystatechange = function() {
if (this.readyState === 4 && this.status === 200) {
alert("Warehouse added successfully");
}
};
xhr.send();
}
function getAllWarehouse() {
let xhr = new XMLHttpRequest();
xhr.open("GET", "/api/warehouse", true);
xhr.onreadystatechange = function() {
if (this.readyState === 4 && this.status === 200) {
let data = JSON.parse(this.responseText);
let warehouseList = document.getElementById("warehouseList");
for (let warehouse in data) {
let list = document.createElement("li");
list.innerHTML = warehouse + ": " + data[warehouse].join(", ");
warehouseList.appendChild(list);
}
}
};
xhr.send();
}
getAllWarehouse();
```
注意事项:
1. 需要在pom.xml中添加Jersey依赖
2. 需要在web.xml中添加Jersey Servlet的配置
3. 需要启动Tomcat等Servlet容器来运行这个项目
[submodule "public_library"] path = public_library url =http://192.168.114.145:8090/automation/ci_backend_service.git
根据你提供的信息看起来子模块的 url 已经被设置为 http://192.168.114.145:8090/automation/ci_backend_service.git,但你在运行 `git submodule update --init --recursive` 命令时仍然得到了 "No url found for submodule path './' in .gitmodules" 的错误。这可能是因为你在 .gitmodules 文件中设置了错误的路径或 url。
请确保 .gitmodules 文件中的路径和 url 是正确的。如果你不确定正确的路径和 url,可以尝试删除 .gitmodules 文件,然后重新执行以下步骤:
1. 运行 `git submodule add` 命令添加子模块。例如:
```
git submodule add http://192.168.114.145:8090/automation/ci_backend_service.git public_library
```
这将会在当前仓库中添加一个名为 public_library 的子模块,并将其关联到指定的 url。
2. 运行 `git submodule update --init --recursive` 命令来初始化子模块。
```
git submodule update --init --recursive
```
这应该可以解决你遇到的问题。
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