Spring Cloud Greenwich.SR1 openfeign的使用

说明

官方文档地址：https://cloud.spring.io/spring-cloud-openfeign/spring-cloud-openfeign.html

使用

pom

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.1.4.RELEASEversion>
        <relativePath/> 
    parent>
    <groupId>com.nightinggroupId>
    <artifactId>feignartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>feignname>
    <description>Demo project for Spring Bootdescription>

    <properties>
        <java.version>1.8java.version>
        <spring-cloud.version>Greenwich.SR1spring-cloud.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-openfeignartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
    dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloudgroupId>
                <artifactId>spring-cloud-dependenciesartifactId>
                <version>${spring-cloud.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>
        dependencies>
    dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>

project>

FeignApplication

package com.nighting.feign;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableFeignClients
@SpringBootApplication
public class FeignApplication {

    public static void main(String[] args) {
        SpringApplication.run(FeignApplication.class, args);
    }

}

FeignDemoController

package com.nighting.feign.controller;

import com.nighting.feign.restclient.FeignEurekaClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;

@RestController
public class FeignDemoController {

    @Autowired
    private FeignEurekaClient feignEurekaClient;

    /**
     * GET请求
     * 从url获取请求参数
     *
     * @param name
     * @return
     */
    @GetMapping("/helloGet")
    public Map<String, Object> helloGet(String name, Integer age) {
        return feignEurekaClient.helloGet(name, age);
    }

    /**
     * POST请求
     * 从表单获取请求参数
     * multipart/form-data,它会将表单的数据处理为一条消息，以标签为单元，用分隔符分开。既可以上传键值对，也可以上传文件
     *
     * @param name
     * @return
     */
    @PostMapping("/helloPostFormData")
    public Map<String, Object> helloPostFormData(String name, Integer age) {
        return feignEurekaClient.helloPostFormData(name, age);
    }

    /**
     * POST请求
     * 从表单获取请求参数
     * application/x-www-form-urlencoded：只能上传键值对，并且键值对都是间隔分开的。
     *
     * @param name
     * @return
     */
    @PostMapping("/helloPostUrlencoded")
    public Map<String, Object> helloPostUrlencoded(String name, Integer age) {
        return feignEurekaClient.helloPostUrlencoded(name, age);
    }

    /**
     * POST请求
     * 获取文本信息,没有key值,只有value
     * text
     *
     * @param name
     * @return
     */
    @PostMapping("/helloPostText")
    public Map<String, Object> helloPostText(@RequestBody String name, Integer age) {
        return feignEurekaClient.helloPostText(name, age);
    }

    /**
     * POST请求
     * 获取文本信息,没有key值,只有value
     * text/plain: 没有格式的文本
     *
     * @param name
     * @return
     */
    @PostMapping("/helloPostTextPlain")
    public Map<String, Object> helloPostTextPlain(@RequestBody String name, Integer age) {
        return feignEurekaClient.helloPostTextPlain(name, age);
    }

    /**
     * POST请求
     * json字符串
     * application/json
     *
     * @return
     */
    @PostMapping("/helloPostJson")
    public Map<String, Object> helloPostJson(@RequestBody Map<String, Object> param, Integer age) {
        return feignEurekaClient.helloPostJson(param, age);
    }

    /**
     * POST请求
     * application/xml
     *
     * @return
     */
    @PostMapping(value = "/helloPostXml", consumes = {MediaType.APPLICATION_XML_VALUE})
    public Map<String, Object> helloPostXml(@RequestBody XmlParam xml, Integer age) {
        return feignEurekaClient.helloPostXml(xml, age);
    }

    /**
     * POST请求
     * text/xml
     *
     * @return
     */
    @PostMapping(value = "/helloPostTextXml", consumes = MediaType.TEXT_XML_VALUE)
    public Map<String, Object> helloPostTextXml(@RequestBody XmlParam xml, Integer age) {
        return feignEurekaClient.helloPostTextXml(xml, age);
    }

}

FeignEurekaClient

package com.nighting.feign.restclient;

import com.nighting.feign.controller.XmlParam;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.Map;

@FeignClient("eureka-client")
public interface FeignEurekaClient {

    /**
     * GET请求
     * 从url获取请求参数
     *
     * @param name
     * @return
     */
    @RequestMapping(value = "/helloGet", method = RequestMethod.GET)
    Map<String, Object> helloGet(@RequestParam String name, @RequestParam Integer age);

    /**
     * POST请求
     * 从表单获取请求参数
     * multipart/form-data,它会将表单的数据处理为一条消息，以标签为单元，用分隔符分开。既可以上传键值对，也可以上传文件
     *
     * @param name
     * @return
     */
    @RequestMapping(value = "/helloPostFormData", method = RequestMethod.POST)
    Map<String, Object> helloPostFormData(@RequestParam String name, @RequestParam Integer age);

    /**
     * POST请求
     * 从表单获取请求参数
     * application/x-www-form-urlencoded：只能上传键值对，并且键值对都是间隔分开的。
     *
     * @param name
     * @return
     */
    @RequestMapping(value = "/helloPostUrlencoded", method = RequestMethod.POST)
    Map<String, Object> helloPostUrlencoded(@RequestParam String name, @RequestParam Integer age);

    /**
     * POST请求
     * 获取文本信息,没有key值,只有value
     * text
     *
     * @param name
     * @return
     */
    @RequestMapping(value = "/helloPostText", method = RequestMethod.POST)
    Map<String, Object> helloPostText(@RequestBody String name, @RequestParam Integer age);

    /**
     * POST请求
     * 获取文本信息,没有key值,只有value
     * text/plain: 没有格式的文本
     *
     * @param name
     * @return
     */
    @RequestMapping(value = "/helloPostTextPlain", method = RequestMethod.POST)
    Map<String, Object> helloPostTextPlain(@RequestBody String name, @RequestParam Integer age);

    /**
     * POST请求
     * json字符串
     * application/json
     *
     * @return
     */
    @RequestMapping(value = "/helloPostJson", method = RequestMethod.POST)
    Map<String, Object> helloPostJson(@RequestBody Map<String, Object> param, @RequestParam Integer age);

    /**
     * POST请求
     * application/xml
     *
     * @return
     */
    @RequestMapping(value = "/helloPostXml", method = RequestMethod.POST, consumes = {MediaType.APPLICATION_XML_VALUE})
    Map<String, Object> helloPostXml(@RequestBody XmlParam xml, @RequestParam Integer age);

    /**
     * POST请求
     * text/xml
     *
     * @return
     */
    @RequestMapping(value = "/helloPostTextXml", consumes = MediaType.TEXT_XML_VALUE)
    Map<String, Object> helloPostTextXml(@RequestBody XmlParam xml, @RequestParam Integer age);


}

XmlParam

package com.nighting.feign.controller;


import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "xml")
public class XmlParam {
    private String name;
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

github

https://github.com/Awaion/feign-demo