openFeign的使用可参考 ---> 《Spring Cloud Alibaba入门四:服务消费者openFeign》

话不多说先看图,再看代码

1. 调用关系图

2. 实体类

import java.math.BigDecimal;

public class Book {
	String bookName;
	
	BigDecimal money;

	public String getBookName() {
		return bookName;
	}

	public void setBookName(String bookName) {
		this.bookName = bookName;
	}

	public BigDecimal getMoney() {
		return money;
	}

	public void setMoney(BigDecimal money) {
		this.money = money;
	}
}

3. 服务端

import java.math.BigDecimal;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.qfx.product.bean.Book;

/**
 * <h5>描述:服务端</h5>
 *  
 */
@RestController
@RequestMapping("book")
public class BookCtr {
	// 单参数接收形式
	@RequestMapping("add")
	public String add(String bookName) {
		return "添加书籍《" + bookName + "》成功!";
	}
	
	// 多参数接收形式
	@RequestMapping("addExt")
	public String addExt(String bookName, BigDecimal money) {
		return "添加书籍《" + bookName + "》成功!单价:" + money + "元";
	}
	
	// 多参数接收形式(从url中获取参数)
	//sub方法中的参数userName和bookName会自动设置为URL中对应变量userName和bookName(同名赋值)的值,也可以自己指定,如:@PathVariable("userName") String userName
	@RequestMapping("sub/{userName}/{bookName}")
	public String sub(@PathVariable String userName, @PathVariable String bookName) {
		return userName + "清理书籍《" + bookName + "》成功!";
	}
	
	// 对象接收形式
	@RequestMapping("addExtTwo")
	public String addExtTwo(Book book) {
		return "添加书籍《" + book.getBookName() + "》成功!单价:" + book.getMoney() + "元";
	}
}

4. Feign接口

import java.math.BigDecimal;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.cloud.openfeign.SpringQueryMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.qfx.order.bean.Book;


/**
 * <h5>描述:Feign接口</h5>
 * get方式传参
 */
@FeignClient(name = "product-service", path = "book")
public interface BookFeignService {
	// 单参数接收形式
	@RequestMapping("add")
	public String add(@RequestParam("bookName") String bookName);
	
	//  多参数接收形式
	@RequestMapping("addExt")
	public String addExt(@RequestParam("bookName") String bookName, @RequestParam("money") BigDecimal money);
	
	// 多参数接收形式(从url中获取参数)
	//sub方法中的参数userName和bookName会自动设置为URL中对应变量userName和bookName(同名赋值)的值,也可以自己指定,如:@PathVariable("userName") String userName
	@RequestMapping("sub/{userName}/{bookName}")
	public String sub(@PathVariable String userName, @PathVariable String bookName);

	// 对象接收形式
	@RequestMapping("addExtTwo")
	public String addExtTwo(@SpringQueryMap Book book);
}

5. 消费端

import java.math.BigDecimal;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.qfx.order.bean.Book;
import com.qfx.order.feign.BookFeignService;

/**
 * <h5>描述:班级</h5>
 *  
 */
@RestController
@RequestMapping("class")
public class ClassCtl {
	
	@Autowired
	BookFeignService bookFeignService;
	
	// 单参数接收形式
	@RequestMapping("add")
	public String add(String bookName) {
		String str = "添加书籍!";
		System.out.println(str);
		str += bookFeignService.add(bookName);
		
		return str;
	}
	
	// 多参数接收形式
	@RequestMapping("addExt")
	public String addExt(String bookName, BigDecimal money) {
		String str = "添加书籍Ext!";
		System.out.println(str);
		str += bookFeignService.addExt(bookName, money);
		
		return str;
	}
	
	// 多参数接收形式
	//sub方法中的参数userName和bookName会自动设置为URL中对应变量userName和bookName(同名赋值)的值,也可以自己指定,如:@PathVariable("userName") String userName
	@RequestMapping("sub/{userName}/{bookName}")
	public String sub(@PathVariable String userName, @PathVariable String bookName) {
		String str = "清理书籍!";
		System.out.println(str);
		str += bookFeignService.sub(userName, bookName);
		
		return str;
	}
	
	// 对象接收形式
	@RequestMapping("addExtTwo")
	public String addExtTwo(Book book) {
		String str = "添加书籍ExtTwo!";
		System.out.println(str);
		str += bookFeignService.addExtTwo(book);
		
		return str;
	}
}

6. 测试

http://localhost:8030/class/add?bookName=三体

http://localhost:8030/class/addExt?bookName=三体&money=100.2201

http://localhost:8030/class/sub/阿三/飞鸟集

http://localhost:8030/class/addExtTwo?bookName=三体&money=99.99