解决方法

我打算设置一个Spring-Angular应用程序.我立即开始使用Hello World示例来测试如何设置环境.我最终做了什么：

在此应用程序中创建Spring-Project并创建Angular-application.现在我可以通过HttpClient角度模块访问Spring-REST-Controllers. (代码示例见下文).

优点：我可以使用mvn包将Angular和Spring部分打包到一个jar中,然后将它部署到我的tomcat上.可悲的是,当我运行服务时,只执行了前端,我无法访问后端的数据.有没有办法设置我的环境,以便我可以获得单项目解决方案的优势,仍然使用ng服务来测试它？

我尝试了什么：

打包并通过终端(java -jar％jar-file％)执行它,并使用localhost：8080 / hello作为我的HttpClient的路径而不是简单/ hello.遗憾的是,这没有成功.

到目前为止我得到的代码：

app.component.ts

import { Component, OnInit } from ''@angular/core'';
import { HttpClient } from ''@angular/common/http'';

@Component({
  selector: ''app-root'',
  templateUrl: ''./app.component.html'',
  styleUrls: [''./app.component.css'']
})
export class AppComponent implements OnInit {
  title = ''HelloWorld'';
  message: string;

  constructor(private http : HttpClient) {}

  ngOnInit() : void {
    //this is where I tried to use localhost:8080/hello instead
    this.http.get(''/hello'').subscribe( data => {
      console.log(''DATA'', data);
      this.message = data[''message''];
    });
  }
}

REST的控制器：

package com.example.helloWorld.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class HelloWorldController {

    @GetMapping("/hello")
    public String sayHello() {
        return "{\"message\": \"Hello, World!\"}";
    }

}

的pom.xml

http://maven.apache.org/xsd/maven-4.0.0.xsd\”\u0026gt;
    4.0.0

<groupId>com.example</groupId>
<artifactId>helloWorld</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>helloWorld</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.0.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

<dependencies>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.restdocs</groupId>
        <artifactId>spring-restdocs-mockmvc</artifactId>
        <scope>test</scope>
    </dependency>
 <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-autoconfigure</artifactId>
  <version>2.1.0.RELEASE</version>
  <type>jar</type>
 </dependency>
 <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
</dependencies>

<build>
    <plugins>
                    <plugin>
                        <groupId>org.codehaus.mojo</groupId>
                        <artifactId>exec-maven-plugin</artifactId>
                        <executions>
                            <execution>
                                <phase>validate</phase>
                                <goals>
                                    <goal>exec</goal>
                                </goals>
                            </execution>
                        </executions>
                        <configuration>
                            <executable>ng</executable>
                            <workingDirectory>src/main/ui</workingDirectory>
                            <arguments>
                                <argument>build</argument>
                            </arguments>
                        </configuration>
                    </plugin>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

解决方法:

这样做

this.http.get(''/hello'').subscribe( data => {
      console.log(''DATA'', data);
      this.message = data[''message''];
    });

您需要执行一些代理配置.
在项目内的package.json所在的同一目录中创建一个proxy-config.json文件.

{
    "/": {
        "target": "http://localhost:8080",
        "secure": false
    }
}

在package.json里面脚本用“start”更新“start”命令：“ng serve –proxy-config proxy-config.json”,
之后尝试使用npm start命令来运行您的项目.